CoordinatorLayout 的自定义波浪下拉刷新

看了一个理财类app的下拉刷新.感觉有点屌.所以特此模仿一下.
先看正版演示:


aa.gif

再看我这盗版演示:


aa1.gif

不得不说的是我的有点丑啊.

最上面的下拉头的问题还没有解决的很完美.有白色的边出现.

说下怎么实现的吧,
1,肯定是先创建个含有CoordinatorLayout布局的scrollingActivity了
2,然后我开始的是头像的滑动的放大和缩小.这个用了一个哥们的自定义的toolbar,代码如下:

package com.sloydev.collapsingavatartoolbar;

import android.content.Context;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.support.annotation.NonNull;
import android.support.design.widget.AppBarLayout;
import android.support.v7.widget.Toolbar;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewParent;
import android.widget.LinearLayout;
import android.widget.TextView;

public class CollapsingAvatarToolbar extends LinearLayout implements AppBarLayout.OnOffsetChangedListener {

    private View avatarView;
    private TextView titleView;

    private float collapsedPadding;
    private float expandedPadding;

    private float expandedImageSize;
    private float collapsedImageSize;

    private float collapsedTextSize;
    private float expandedTextSize;

    private boolean valuesCalculatedAlready = false;
    private Toolbar toolbar;
    private AppBarLayout appBarLayout;
    private float collapsedHeight;
    private float expandedHeight;
    private float maxOffset;

    private CollapseChangedListener collapseChangedListener;

    public CollapsingAvatarToolbar(Context context) {
        this(context, null);
        init();
    }

    public CollapsingAvatarToolbar(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();

        TypedArray a = context.getTheme().obtainStyledAttributes(attrs, R.styleable.CollapsingAvatarToolbar, 0, 0);

        try {
            collapsedPadding = a.getDimension(R.styleable.CollapsingAvatarToolbar_collapsedPadding, -1);
            expandedPadding = a.getDimension(R.styleable.CollapsingAvatarToolbar_expandedPadding, -1);

            collapsedImageSize = a.getDimension(R.styleable.CollapsingAvatarToolbar_collapsedImageSize, -1);
            expandedImageSize = a.getDimension(R.styleable.CollapsingAvatarToolbar_expandedImageSize, -1);

            collapsedTextSize = a.getDimension(R.styleable.CollapsingAvatarToolbar_collapsedTextSize, -1);
            expandedTextSize = a.getDimension(R.styleable.CollapsingAvatarToolbar_expandedTextSize, -1);
        } finally {
            a.recycle();
        }

        final Resources resources = getResources();
        if (collapsedPadding < 0) {
            collapsedPadding = resources.getDimension(R.dimen.default_collapsed_padding);
        }
        if (expandedPadding < 0) {
            expandedPadding = resources.getDimension(R.dimen.default_expanded_padding);
        }
        if (collapsedImageSize < 0) {
            collapsedImageSize = resources.getDimension(R.dimen.default_collapsed_image_size);
        }
        if (expandedImageSize < 0) {
            expandedImageSize = resources.getDimension(R.dimen.default_expanded_image_size);
        }
        if (collapsedTextSize < 0) {
            collapsedTextSize = resources.getDimension(R.dimen.default_collapsed_text_size);
        }
        if (expandedTextSize < 0) {
            expandedTextSize = resources.getDimension(R.dimen.default_expanded_text_size);
        }
    }

    public void setCollapseChangedListener(CollapseChangedListener collapseChangedListener) {
        this.collapseChangedListener = collapseChangedListener;
    }

    private void init() {
        setOrientation(HORIZONTAL);
    }

    @NonNull
    private AppBarLayout findParentAppBarLayout() {
        ViewParent parent = this.getParent();
        if (parent instanceof AppBarLayout) {
            return ((AppBarLayout) parent);
        } else if (parent.getParent() instanceof AppBarLayout) {
            return ((AppBarLayout) parent.getParent());
        } else {
            throw new IllegalStateException("Must be inside an AppBarLayout"); //TODO actually, a collapsingtoolbar
        }
    }

    protected void onAttachedToWindow() {
        super.onAttachedToWindow();
        findViews();
        if (!isInEditMode()) {
            appBarLayout.addOnOffsetChangedListener(this);
        } else {
            setExpandedValuesForEditMode();
        }
    }

    private void setExpandedValuesForEditMode() {
        calculateValues();
        updateViews(1f, 0);
    }

    private void findViews() {
        appBarLayout = findParentAppBarLayout();
        toolbar = findSiblingToolbar();
        avatarView = findAvatar();
        titleView = findTitle();
    }

    @NonNull
    private View findAvatar() {
        View avatar = this.findViewById(R.id.cat_avatar);
        if (avatar == null) {
            throw new IllegalStateException("View with id ta_avatar not found");
        }
        return avatar;
    }

    @NonNull
    private TextView findTitle() {
        TextView title = (TextView) this.findViewById(R.id.cat_title);
        if (title == null) {
            throw new IllegalStateException("TextView with id ta_title not found");
        }
        return title;
    }

    @NonNull
    private Toolbar findSiblingToolbar() {
        ViewGroup parent = ((ViewGroup) this.getParent());
        for (int i = 0, c = parent.getChildCount(); i < c; i++) {
            View child = parent.getChildAt(i);
            if (child instanceof Toolbar) {
                return (Toolbar) child;
            }
        }
        throw new IllegalStateException("No toolbar found as sibling");
    }

    @Override
    public void onOffsetChanged(AppBarLayout appBarLayout, int offset) {
        if (!valuesCalculatedAlready) {
            calculateValues();
            valuesCalculatedAlready = true;
        }
        float collapsedProgress = -offset / maxOffset;
        updateViews(collapsedProgress, offset);
        notifyListener(collapsedProgress);
    }

    private void calculateValues() {
        collapsedHeight = toolbar.getHeight();
        expandedHeight = appBarLayout.getHeight() - toolbar.getHeight();
        maxOffset = expandedHeight;
    }

    private void updateViews(float collapsedProgress, int currentOffset) {
        float expandedProgress = 1 - collapsedProgress;
        float translation = -currentOffset + ((float) toolbar.getHeight() * expandedProgress);

        float currHeight = collapsedHeight + (expandedHeight - collapsedHeight) * expandedProgress;
        float currentPadding = expandedPadding + (collapsedPadding - expandedPadding) * collapsedProgress;
        float currentImageSize = collapsedImageSize + (expandedImageSize - collapsedImageSize) * expandedProgress;
        float currentTextSize = collapsedTextSize + (expandedTextSize - collapsedTextSize) * expandedProgress;

        setContainerOffset(translation);
        setContainerHeight((int) currHeight);
        setPadding((int) currentPadding);
        setAvatarSize((int) currentImageSize);
        setTextSize(currentTextSize);
    }

    private void setContainerOffset(float translation) {
        this.setTranslationY(translation);
    }

    private void setContainerHeight(int currHeight) {
        this.getLayoutParams().height = currHeight;
    }

    private void setPadding(int currentPadding) {
        this.setPadding(currentPadding, 0, 0, 0);
    }

    private void setTextSize(float currentTextSize) {
        titleView.setTextSize(TypedValue.COMPLEX_UNIT_PX, currentTextSize);
    }

    private void setAvatarSize(int currentImageSize) {
        avatarView.getLayoutParams().height = currentImageSize;
        avatarView.getLayoutParams().width = currentImageSize;
    }

    private void notifyListener(float collapsedProgress) {
        if (collapseChangedListener != null) {
            collapseChangedListener.onCollapseChanged(collapsedProgress);
        }
    }

    public interface CollapseChangedListener {

        void onCollapseChanged(float collapsedProgress);
    }
}

3,头像问题解决了之后是在滑动的时候toolbar的颜色的渐变并且还有状态栏的颜色是个toolbar的颜色的一致的渐变,这里的代码在后面会贴出
4,头像的问题解决了之后就该到了让人头疼的下拉刷新了.这个刷新是嵌套的CoordinatorLayout,在做这个效果的时候度娘都要快被我查烂了.试过各种办法.都是不了了之.当时觉得哎,好烦.后来静下心之后,有篇文章也是写下拉刷新的,用的是swipeRefreshLayout的改进,我采取了这个方法,然后自己在巨人的肩膀上在修改.代码如下:

package com.ccstest.views;

import android.content.Context;
import android.graphics.Color;
import android.support.v4.view.MotionEventCompat;
import android.support.v4.view.ViewCompat;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.ImageView;
import android.widget.Scroller;

import com.ccstest.R;

/**
 * Created by AItsuki on 2016/6/13.
 * -
 */
public class RefreshLayout extends ViewGroup {

    private static final String TAG = "RefreshLayout";
    private static final float DRAG_RATE = 0.5f;
    private static final int INVALID_POINTER = -1;

    // scroller duration
    private static final int SCROLL_TO_TOP_DURATION = 800;
    private static final int SCROLL_TO_REFRESH_DURATION = 250;
    private static final long SHOW_COMPLETED_TIME = 500;

    private View refreshHeader;
    private View target;
    private int currentTargetOffsetTop; // target/header偏移距离
    private int lastTargetOffsetTop;

    private boolean hasMeasureHeader;   // 是否已经计算头部高度
    private int touchSlop;
    private int headerHeight;       // header高度
    private int totalDragDistance;  // 需要下拉这个距离才进入松手刷新状态,默认和header高度一致
    private int maxDragDistance;
    private int activePointerId;
    private boolean isTouch;
    private boolean hasSendCancelEvent;
    private float lastMotionX;
    private float lastMotionY;
    private float initDownY;
    private float initDownX;
    private static final int START_POSITION = 0;
    private MotionEvent lastEvent;
    private boolean mIsBeginDragged;
    private AutoScroll autoScroll;
    private State state = State.RESET;
    private OnRefreshListener refreshListener;
    private boolean isAutoRefresh;


    // 刷新成功,显示500ms成功状态再滚动回顶部
    private Runnable delayToScrollTopRunnable = new Runnable() {
        @Override
        public void run() {
            autoScroll.scrollTo(START_POSITION, SCROLL_TO_TOP_DURATION);
        }
    };

    private Runnable autoRefreshRunnable = new Runnable() {
        @Override
        public void run() {
            // 标记当前是自动刷新状态,finishScroll调用时需要判断
            // 在actionDown事件中重新标记为false
            isAutoRefresh = true;
            changeState(State.PULL);
            autoScroll.scrollTo(totalDragDistance, SCROLL_TO_REFRESH_DURATION);
        }
    };


    public RefreshLayout(Context context) {
        this(context, null);
    }

    public RefreshLayout(Context context, AttributeSet attrs) {
        super(context, attrs);

        touchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
        autoScroll = new AutoScroll();

        // 添加默认的头部,先简单的用一个ImageView代替头部
        ImageView imageView = new ImageView(context);
        imageView.setImageResource(R.drawable.gold);
        imageView.setBackgroundColor(Color.BLACK);
        setRefreshHeader(imageView);
    }

    /**
     * 设置自定义header
     */
    public void setRefreshHeader(View view) {
        if (view != null && view != refreshHeader) {
            removeView(refreshHeader);

            // 为header添加默认的layoutParams
            LayoutParams layoutParams = view.getLayoutParams();
            if (layoutParams == null) {
                layoutParams = new LayoutParams(LayoutParams.MATCH_PARENT, Utils.dp2px(getContext(), 80));
//                layoutParams = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
                view.setLayoutParams(layoutParams);
            }
            refreshHeader = view;
            addView(refreshHeader);
        }
    }

    public void setRefreshListener(OnRefreshListener refreshListener) {
        this.refreshListener = refreshListener;
    }

    public void refreshComplete() {
        changeState(State.COMPLETE);
        // if refresh completed and the target at top, change state to reset.
        if (currentTargetOffsetTop == START_POSITION) {
            changeState(State.RESET);
        } else {
            // waiting for a time to show refreshView completed state.
            // at next touch event, remove this runnable
            if (!isTouch) {
                postDelayed(delayToScrollTopRunnable, SHOW_COMPLETED_TIME);
            }
        }
    }

    public void autoRefresh() {
        autoRefresh(500);
    }

    /**
     * 在onCreate中调用autoRefresh,此时View可能还没有初始化好,需要延长一段时间执行。
     *
     * @param duration 延时执行的毫秒值
     */
    public void autoRefresh(long duration) {
        if (state != State.RESET) {
            return;
        }
        postDelayed(autoRefreshRunnable, duration);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        if (target == null) {
            ensureTarget();
        }

        if (target == null) {
            return;
        }

        // ----- measure target -----
        // target占满整屏
        target.measure(MeasureSpec.makeMeasureSpec(
                getMeasuredWidth() - getPaddingLeft() - getPaddingRight(),
                MeasureSpec.EXACTLY), MeasureSpec.makeMeasureSpec(
                getMeasuredHeight() - getPaddingTop() - getPaddingBottom(), MeasureSpec.EXACTLY));

        // ----- measure refreshView-----
        measureChild(refreshHeader, widthMeasureSpec, heightMeasureSpec);
        if (!hasMeasureHeader) { // 防止header重复测量
            hasMeasureHeader = true;
            headerHeight = refreshHeader.getMeasuredHeight(); // header高度
            totalDragDistance = headerHeight;   // 需要pull这个距离才进入松手刷新状态
            if (maxDragDistance == 0) {  // 默认最大下拉距离为控件高度的五分之四
                maxDragDistance = totalDragDistance*4/5;
            }
        }
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        final int width = getMeasuredWidth();
        final int height = getMeasuredHeight();
        if (getChildCount() == 0) {
            return;
        }

        if (target == null) {
            ensureTarget();
        }
        if (target == null) {
            return;
        }

        // target铺满屏幕
        final View child = target;
        final int childLeft = getPaddingLeft();
        final int childTop = getPaddingTop() + currentTargetOffsetTop;
        final int childWidth = width - getPaddingLeft() - getPaddingRight();
        final int childHeight = height - getPaddingTop() - getPaddingBottom();
        child.layout(childLeft, childTop, childLeft + childWidth, childTop + childHeight);

        // header放到target的上方,水平居中
        int refreshViewWidth = refreshHeader.getMeasuredWidth();
        refreshHeader.layout((width / 2 - refreshViewWidth / 2),
                -headerHeight + currentTargetOffsetTop,
                (width / 2 + refreshViewWidth / 2),
                currentTargetOffsetTop);
    }

    /**
     * 将第一个Child作为target
     */
    private void ensureTarget() {
        // Don't bother getting the parent height if the parent hasn't been laid
        // out yet.
        if (target == null) {
            for (int i = 0; i < getChildCount(); i++) {
                View child = getChildAt(i);
                if (!child.equals(refreshHeader)) {
                    target = child;
                    break;
                }
            }
        }
    }

    @Override
    public boolean dispatchTouchEvent(MotionEvent ev) {
        if (!isEnabled() || target == null) {
            return super.dispatchTouchEvent(ev);
        }

        final int actionMasked = ev.getActionMasked(); // support Multi-touch
        switch (actionMasked) {
            case MotionEvent.ACTION_DOWN:
                activePointerId = ev.getPointerId(0);
                isAutoRefresh = false;
                isTouch = true;
                hasSendCancelEvent = false;
                mIsBeginDragged = false;
                lastTargetOffsetTop = currentTargetOffsetTop;
                currentTargetOffsetTop = target.getTop();
                initDownX = lastMotionX = ev.getX(0);
                initDownY = lastMotionY = ev.getY(0);
                autoScroll.stop();
                removeCallbacks(delayToScrollTopRunnable);
                removeCallbacks(autoRefreshRunnable);
                super.dispatchTouchEvent(ev);
                return true;    // return true,否则可能接受不到move和up事件

            case MotionEvent.ACTION_MOVE:
                if (activePointerId == INVALID_POINTER) {
                    Log.e(TAG, "Got ACTION_MOVE event but don't have an active pointer id.");
                    return super.dispatchTouchEvent(ev);
                }
                lastEvent = ev;
                float x = ev.getX(MotionEventCompat.findPointerIndex(ev, activePointerId));
                float y = ev.getY(MotionEventCompat.findPointerIndex(ev, activePointerId));
                float yDiff = y - lastMotionY;
                float offsetY = yDiff * DRAG_RATE;
                lastMotionX = x;
                lastMotionY = y;

                if (!mIsBeginDragged && Math.abs(y - initDownY) > touchSlop) {
                    mIsBeginDragged = true;
                }

                if (mIsBeginDragged) {
                    boolean moveDown = offsetY > 0; // ↓
                    boolean canMoveDown = canChildScrollUp();
                    boolean moveUp = !moveDown;     // ↑
                    boolean canMoveUp = currentTargetOffsetTop > START_POSITION;

                    // 判断是否拦截事件
                    if ((moveDown && !canMoveDown) || (moveUp && canMoveUp)) {
                        moveSpinner(offsetY);
                        return true;
                    }
                }
                break;

            case MotionEvent.ACTION_CANCEL:
            case MotionEvent.ACTION_UP:
                isTouch = false;
                if (currentTargetOffsetTop > START_POSITION) {
                    finishSpinner();
                }
                activePointerId = INVALID_POINTER;
                break;

            case MotionEvent.ACTION_POINTER_DOWN:
                int pointerIndex = MotionEventCompat.getActionIndex(ev);
                if (pointerIndex < 0) {
                    Log.e(TAG, "Got ACTION_POINTER_DOWN event but have an invalid action index.");
                    return super.dispatchTouchEvent(ev);
                }
                lastMotionX = ev.getX(pointerIndex);
                lastMotionY = ev.getY(pointerIndex);
                lastEvent = ev;
                activePointerId = MotionEventCompat.getPointerId(ev, pointerIndex);
                break;

            case MotionEvent.ACTION_POINTER_UP:
                onSecondaryPointerUp(ev);
                lastMotionY = ev.getY(ev.findPointerIndex(activePointerId));
                lastMotionX = ev.getX(ev.findPointerIndex(activePointerId));
                break;
        }
        return super.dispatchTouchEvent(ev);
    }


    private void moveSpinner(float diff) {
        int offset = Math.round(diff);
        if (offset == 0) {
            return;
        }

        // 发送cancel事件给child
        if (!hasSendCancelEvent && isTouch && currentTargetOffsetTop > START_POSITION) {
            sendCancelEvent();
            hasSendCancelEvent = true;
        }

        int targetY = Math.max(0, currentTargetOffsetTop + offset); // target不能移动到小于0的位置……
        // y = x - (x/2)^2
        float extraOS = targetY - totalDragDistance;
        float slingshotDist = totalDragDistance;
        float tensionSlingshotPercent = Math.max(0, Math.min(extraOS, slingshotDist * 2) / slingshotDist);
        float tensionPercent = (float) (tensionSlingshotPercent - Math.pow(tensionSlingshotPercent / 2, 2));

        if (offset > 0) { // 下拉的时候才添加阻力
            offset = (int) (offset * (1f - tensionPercent));
            targetY = Math.max(0, currentTargetOffsetTop + offset);
        }

        // 1. 在RESET状态时,第一次下拉出现header的时候,设置状态变成PULL
        if (state == State.RESET && currentTargetOffsetTop == START_POSITION && targetY > 0) {
            changeState(State.PULL);
        }

        // 2. 在PULL或者COMPLETE状态时,header回到顶部的时候,状态变回RESET
        if (currentTargetOffsetTop > START_POSITION && targetY <= START_POSITION) {
            if (state == State.PULL || state == State.COMPLETE) {
                changeState(State.RESET);
            }
        }

        // 3. 如果是从底部回到顶部的过程(往上滚动),并且手指是松开状态, 并且当前是PULL状态,状态变成LOADING,这时候我们需要强制停止autoScroll
        if (state == State.PULL && !isTouch && currentTargetOffsetTop > totalDragDistance && targetY <= totalDragDistance) {
            autoScroll.stop();
            changeState(State.LOADING);
            if (refreshListener != null) {
                refreshListener.onRefresh();
            }
            // 因为判断条件targetY <= totalDragDistance,会导致不能回到正确的刷新高度(有那么一丁点偏差),调整change
            int adjustOffset = totalDragDistance - targetY;
            offset += adjustOffset;
        }

        setTargetOffsetTopAndBottom(offset);

        // 别忘了回调header的位置改变方法。
        if (refreshHeader instanceof RefreshHeader) {
            ((RefreshHeader) refreshHeader)
                    .onPositionChange(currentTargetOffsetTop, lastTargetOffsetTop, totalDragDistance, isTouch, state);

        }

    }

    private void finishSpinner() {
        if (state == State.LOADING) {
            if (currentTargetOffsetTop > totalDragDistance) {
                autoScroll.scrollTo(totalDragDistance, SCROLL_TO_REFRESH_DURATION);
            }
        } else {
            autoScroll.scrollTo(START_POSITION, SCROLL_TO_TOP_DURATION);
        }
    }


    private void changeState(State state) {
        this.state = state;

//        Toast.makeText(getContext(), state.toString(), Toast.LENGTH_SHORT).show();
        RefreshHeader refreshHeader = this.refreshHeader instanceof RefreshHeader ? ((RefreshHeader) this.refreshHeader) : null;
        if (refreshHeader != null) {
            switch (state) {
                case RESET:
                    refreshHeader.reset();
                    break;
                case PULL:
                    refreshHeader.pull();
                    break;
                case LOADING:
                    refreshHeader.refreshing();
                    break;
                case COMPLETE:
                    refreshHeader.complete();
                    break;
            }
        }
    }

    //add




    private void setTargetOffsetTopAndBottom(int offset) {
        if (offset == 0) {
            return;
        }
        target.offsetTopAndBottom(offset);
        refreshHeader.offsetTopAndBottom(offset);
        lastTargetOffsetTop = currentTargetOffsetTop;
        currentTargetOffsetTop = target.getTop();
//        Log.e(TAG, "moveSpinner: currentTargetOffsetTop = "+ currentTargetOffsetTop);
        invalidate();
    }

    private void sendCancelEvent() {
        if (lastEvent == null) {
            return;
        }
        MotionEvent ev = MotionEvent.obtain(lastEvent);
        ev.setAction(MotionEvent.ACTION_CANCEL);
        super.dispatchTouchEvent(ev);
    }

    private void onSecondaryPointerUp(MotionEvent ev) {
        final int pointerIndex = MotionEventCompat.getActionIndex(ev);
        final int pointerId = MotionEventCompat.getPointerId(ev, pointerIndex);
        if (pointerId == activePointerId) {
            // This was our active pointer going up. Choose a new
            // active pointer and adjust accordingly.
            final int newPointerIndex = pointerIndex == 0 ? 1 : 0;
            lastMotionY = ev.getY(newPointerIndex);
            lastMotionX = ev.getX(newPointerIndex);
            activePointerId = MotionEventCompat.getPointerId(ev, newPointerIndex);
        }
    }

    public boolean canChildScrollUp() {
        if (android.os.Build.VERSION.SDK_INT < 14) {
            if (target instanceof AbsListView) {
                final AbsListView absListView = (AbsListView) target;
                return absListView.getChildCount() > 0
                        && (absListView.getFirstVisiblePosition() > 0 || absListView.getChildAt(0)
                        .getTop() < absListView.getPaddingTop());
            } else {
                return ViewCompat.canScrollVertically(target, -1) || target.getScrollY() > 0;
            }
        } else {
            return ViewCompat.canScrollVertically(target, -1);
        }
    }


    private class AutoScroll implements Runnable {
        private Scroller scroller;
        private int lastY;

        public AutoScroll() {
            scroller = new Scroller(getContext());
        }

        @Override
        public void run() {
            boolean finished = !scroller.computeScrollOffset() || scroller.isFinished();
            if (!finished) {
                int currY = scroller.getCurrY();
                int offset = currY - lastY;
                lastY = currY;
                moveSpinner(offset);
                post(this);
                onScrollFinish(false);
            } else {
                stop();
                onScrollFinish(true);
            }
        }

        public void scrollTo(int to, int duration) {
            int from = currentTargetOffsetTop;
            int distance = to - from;
            stop();
            if (distance == 0) {
                return;
            }
            scroller.startScroll(0, 0, 0, distance, duration);
            post(this);
        }

        private void stop() {
            removeCallbacks(this);
            if (!scroller.isFinished()) {
                scroller.forceFinished(true);
            }
            lastY = 0;
        }
    }

    /**
     * 在scroll结束的时候会回调这个方法
     *
     * @param isForceFinish 是否是强制结束的
     */
    private void onScrollFinish(boolean isForceFinish) {
        if (isAutoRefresh && !isForceFinish) {
            isAutoRefresh = false;
            changeState(State.LOADING);
            if (refreshListener != null) {
                refreshListener.onRefresh();
            }
            finishSpinner();
        }
    }

    public interface OnRefreshListener {
        void onRefresh();
    }

    public enum State {
        RESET, PULL, LOADING, COMPLETE
    }

}

还有这个类:

package com.ccstest.views;

import android.content.Context;
import android.graphics.Color;
import android.support.v4.view.MotionEventCompat;
import android.support.v4.view.ViewCompat;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.ImageView;
import android.widget.Scroller;

import com.ccstest.R;

/**
 * Created by AItsuki on 2016/6/13.
 * -
 */
public class RefreshLayout extends ViewGroup {

    private static final String TAG = "RefreshLayout";
    private static final float DRAG_RATE = 0.5f;
    private static final int INVALID_POINTER = -1;

    // scroller duration
    private static final int SCROLL_TO_TOP_DURATION = 800;
    private static final int SCROLL_TO_REFRESH_DURATION = 250;
    private static final long SHOW_COMPLETED_TIME = 500;

    private View refreshHeader;
    private View target;
    private int currentTargetOffsetTop; // target/header偏移距离
    private int lastTargetOffsetTop;

    private boolean hasMeasureHeader;   // 是否已经计算头部高度
    private int touchSlop;
    private int headerHeight;       // header高度
    private int totalDragDistance;  // 需要下拉这个距离才进入松手刷新状态,默认和header高度一致
    private int maxDragDistance;
    private int activePointerId;
    private boolean isTouch;
    private boolean hasSendCancelEvent;
    private float lastMotionX;
    private float lastMotionY;
    private float initDownY;
    private float initDownX;
    private static final int START_POSITION = 0;
    private MotionEvent lastEvent;
    private boolean mIsBeginDragged;
    private AutoScroll autoScroll;
    private State state = State.RESET;
    private OnRefreshListener refreshListener;
    private boolean isAutoRefresh;


    // 刷新成功,显示500ms成功状态再滚动回顶部
    private Runnable delayToScrollTopRunnable = new Runnable() {
        @Override
        public void run() {
            autoScroll.scrollTo(START_POSITION, SCROLL_TO_TOP_DURATION);
        }
    };

    private Runnable autoRefreshRunnable = new Runnable() {
        @Override
        public void run() {
            // 标记当前是自动刷新状态,finishScroll调用时需要判断
            // 在actionDown事件中重新标记为false
            isAutoRefresh = true;
            changeState(State.PULL);
            autoScroll.scrollTo(totalDragDistance, SCROLL_TO_REFRESH_DURATION);
        }
    };


    public RefreshLayout(Context context) {
        this(context, null);
    }

    public RefreshLayout(Context context, AttributeSet attrs) {
        super(context, attrs);

        touchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
        autoScroll = new AutoScroll();

        // 添加默认的头部,先简单的用一个ImageView代替头部
        ImageView imageView = new ImageView(context);
        imageView.setImageResource(R.drawable.gold);
        imageView.setBackgroundColor(Color.BLACK);
        setRefreshHeader(imageView);
    }

    /**
     * 设置自定义header
     */
    public void setRefreshHeader(View view) {
        if (view != null && view != refreshHeader) {
            removeView(refreshHeader);

            // 为header添加默认的layoutParams
            LayoutParams layoutParams = view.getLayoutParams();
            if (layoutParams == null) {
                layoutParams = new LayoutParams(LayoutParams.MATCH_PARENT, Utils.dp2px(getContext(), 80));
//                layoutParams = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
                view.setLayoutParams(layoutParams);
            }
            refreshHeader = view;
            addView(refreshHeader);
        }
    }

    public void setRefreshListener(OnRefreshListener refreshListener) {
        this.refreshListener = refreshListener;
    }

    public void refreshComplete() {
        changeState(State.COMPLETE);
        // if refresh completed and the target at top, change state to reset.
        if (currentTargetOffsetTop == START_POSITION) {
            changeState(State.RESET);
        } else {
            // waiting for a time to show refreshView completed state.
            // at next touch event, remove this runnable
            if (!isTouch) {
                postDelayed(delayToScrollTopRunnable, SHOW_COMPLETED_TIME);
            }
        }
    }

    public void autoRefresh() {
        autoRefresh(500);
    }

    /**
     * 在onCreate中调用autoRefresh,此时View可能还没有初始化好,需要延长一段时间执行。
     *
     * @param duration 延时执行的毫秒值
     */
    public void autoRefresh(long duration) {
        if (state != State.RESET) {
            return;
        }
        postDelayed(autoRefreshRunnable, duration);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        if (target == null) {
            ensureTarget();
        }

        if (target == null) {
            return;
        }

        // ----- measure target -----
        // target占满整屏
        target.measure(MeasureSpec.makeMeasureSpec(
                getMeasuredWidth() - getPaddingLeft() - getPaddingRight(),
                MeasureSpec.EXACTLY), MeasureSpec.makeMeasureSpec(
                getMeasuredHeight() - getPaddingTop() - getPaddingBottom(), MeasureSpec.EXACTLY));

        // ----- measure refreshView-----
        measureChild(refreshHeader, widthMeasureSpec, heightMeasureSpec);
        if (!hasMeasureHeader) { // 防止header重复测量
            hasMeasureHeader = true;
            headerHeight = refreshHeader.getMeasuredHeight(); // header高度
            totalDragDistance = headerHeight;   // 需要pull这个距离才进入松手刷新状态
            if (maxDragDistance == 0) {  // 默认最大下拉距离为控件高度的五分之四
                maxDragDistance = totalDragDistance*4/5;
            }
        }
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        final int width = getMeasuredWidth();
        final int height = getMeasuredHeight();
        if (getChildCount() == 0) {
            return;
        }

        if (target == null) {
            ensureTarget();
        }
        if (target == null) {
            return;
        }

        // target铺满屏幕
        final View child = target;
        final int childLeft = getPaddingLeft();
        final int childTop = getPaddingTop() + currentTargetOffsetTop;
        final int childWidth = width - getPaddingLeft() - getPaddingRight();
        final int childHeight = height - getPaddingTop() - getPaddingBottom();
        child.layout(childLeft, childTop, childLeft + childWidth, childTop + childHeight);

        // header放到target的上方,水平居中
        int refreshViewWidth = refreshHeader.getMeasuredWidth();
        refreshHeader.layout((width / 2 - refreshViewWidth / 2),
                -headerHeight + currentTargetOffsetTop,
                (width / 2 + refreshViewWidth / 2),
                currentTargetOffsetTop);
    }

    /**
     * 将第一个Child作为target
     */
    private void ensureTarget() {
        // Don't bother getting the parent height if the parent hasn't been laid
        // out yet.
        if (target == null) {
            for (int i = 0; i < getChildCount(); i++) {
                View child = getChildAt(i);
                if (!child.equals(refreshHeader)) {
                    target = child;
                    break;
                }
            }
        }
    }

    @Override
    public boolean dispatchTouchEvent(MotionEvent ev) {
        if (!isEnabled() || target == null) {
            return super.dispatchTouchEvent(ev);
        }

        final int actionMasked = ev.getActionMasked(); // support Multi-touch
        switch (actionMasked) {
            case MotionEvent.ACTION_DOWN:
                activePointerId = ev.getPointerId(0);
                isAutoRefresh = false;
                isTouch = true;
                hasSendCancelEvent = false;
                mIsBeginDragged = false;
                lastTargetOffsetTop = currentTargetOffsetTop;
                currentTargetOffsetTop = target.getTop();
                initDownX = lastMotionX = ev.getX(0);
                initDownY = lastMotionY = ev.getY(0);
                autoScroll.stop();
                removeCallbacks(delayToScrollTopRunnable);
                removeCallbacks(autoRefreshRunnable);
                super.dispatchTouchEvent(ev);
                return true;    // return true,否则可能接受不到move和up事件

            case MotionEvent.ACTION_MOVE:
                if (activePointerId == INVALID_POINTER) {
                    Log.e(TAG, "Got ACTION_MOVE event but don't have an active pointer id.");
                    return super.dispatchTouchEvent(ev);
                }
                lastEvent = ev;
                float x = ev.getX(MotionEventCompat.findPointerIndex(ev, activePointerId));
                float y = ev.getY(MotionEventCompat.findPointerIndex(ev, activePointerId));
                float yDiff = y - lastMotionY;
                float offsetY = yDiff * DRAG_RATE;
                lastMotionX = x;
                lastMotionY = y;

                if (!mIsBeginDragged && Math.abs(y - initDownY) > touchSlop) {
                    mIsBeginDragged = true;
                }

                if (mIsBeginDragged) {
                    boolean moveDown = offsetY > 0; // ↓
                    boolean canMoveDown = canChildScrollUp();
                    boolean moveUp = !moveDown;     // ↑
                    boolean canMoveUp = currentTargetOffsetTop > START_POSITION;

                    // 判断是否拦截事件
                    if ((moveDown && !canMoveDown) || (moveUp && canMoveUp)) {
                        moveSpinner(offsetY);
                        return true;
                    }
                }
                break;

            case MotionEvent.ACTION_CANCEL:
            case MotionEvent.ACTION_UP:
                isTouch = false;
                if (currentTargetOffsetTop > START_POSITION) {
                    finishSpinner();
                }
                activePointerId = INVALID_POINTER;
                break;

            case MotionEvent.ACTION_POINTER_DOWN:
                int pointerIndex = MotionEventCompat.getActionIndex(ev);
                if (pointerIndex < 0) {
                    Log.e(TAG, "Got ACTION_POINTER_DOWN event but have an invalid action index.");
                    return super.dispatchTouchEvent(ev);
                }
                lastMotionX = ev.getX(pointerIndex);
                lastMotionY = ev.getY(pointerIndex);
                lastEvent = ev;
                activePointerId = MotionEventCompat.getPointerId(ev, pointerIndex);
                break;

            case MotionEvent.ACTION_POINTER_UP:
                onSecondaryPointerUp(ev);
                lastMotionY = ev.getY(ev.findPointerIndex(activePointerId));
                lastMotionX = ev.getX(ev.findPointerIndex(activePointerId));
                break;
        }
        return super.dispatchTouchEvent(ev);
    }


    private void moveSpinner(float diff) {
        int offset = Math.round(diff);
        if (offset == 0) {
            return;
        }

        // 发送cancel事件给child
        if (!hasSendCancelEvent && isTouch && currentTargetOffsetTop > START_POSITION) {
            sendCancelEvent();
            hasSendCancelEvent = true;
        }

        int targetY = Math.max(0, currentTargetOffsetTop + offset); // target不能移动到小于0的位置……
        // y = x - (x/2)^2
        float extraOS = targetY - totalDragDistance;
        float slingshotDist = totalDragDistance;
        float tensionSlingshotPercent = Math.max(0, Math.min(extraOS, slingshotDist * 2) / slingshotDist);
        float tensionPercent = (float) (tensionSlingshotPercent - Math.pow(tensionSlingshotPercent / 2, 2));

        if (offset > 0) { // 下拉的时候才添加阻力
            offset = (int) (offset * (1f - tensionPercent));
            targetY = Math.max(0, currentTargetOffsetTop + offset);
        }

        // 1. 在RESET状态时,第一次下拉出现header的时候,设置状态变成PULL
        if (state == State.RESET && currentTargetOffsetTop == START_POSITION && targetY > 0) {
            changeState(State.PULL);
        }

        // 2. 在PULL或者COMPLETE状态时,header回到顶部的时候,状态变回RESET
        if (currentTargetOffsetTop > START_POSITION && targetY <= START_POSITION) {
            if (state == State.PULL || state == State.COMPLETE) {
                changeState(State.RESET);
            }
        }

        // 3. 如果是从底部回到顶部的过程(往上滚动),并且手指是松开状态, 并且当前是PULL状态,状态变成LOADING,这时候我们需要强制停止autoScroll
        if (state == State.PULL && !isTouch && currentTargetOffsetTop > totalDragDistance && targetY <= totalDragDistance) {
            autoScroll.stop();
            changeState(State.LOADING);
            if (refreshListener != null) {
                refreshListener.onRefresh();
            }
            // 因为判断条件targetY <= totalDragDistance,会导致不能回到正确的刷新高度(有那么一丁点偏差),调整change
            int adjustOffset = totalDragDistance - targetY;
            offset += adjustOffset;
        }

        setTargetOffsetTopAndBottom(offset);

        // 别忘了回调header的位置改变方法。
        if (refreshHeader instanceof RefreshHeader) {
            ((RefreshHeader) refreshHeader)
                    .onPositionChange(currentTargetOffsetTop, lastTargetOffsetTop, totalDragDistance, isTouch, state);

        }

    }

    private void finishSpinner() {
        if (state == State.LOADING) {
            if (currentTargetOffsetTop > totalDragDistance) {
                autoScroll.scrollTo(totalDragDistance, SCROLL_TO_REFRESH_DURATION);
            }
        } else {
            autoScroll.scrollTo(START_POSITION, SCROLL_TO_TOP_DURATION);
        }
    }


    private void changeState(State state) {
        this.state = state;

//        Toast.makeText(getContext(), state.toString(), Toast.LENGTH_SHORT).show();
        RefreshHeader refreshHeader = this.refreshHeader instanceof RefreshHeader ? ((RefreshHeader) this.refreshHeader) : null;
        if (refreshHeader != null) {
            switch (state) {
                case RESET:
                    refreshHeader.reset();
                    break;
                case PULL:
                    refreshHeader.pull();
                    break;
                case LOADING:
                    refreshHeader.refreshing();
                    break;
                case COMPLETE:
                    refreshHeader.complete();
                    break;
            }
        }
    }

    //add




    private void setTargetOffsetTopAndBottom(int offset) {
        if (offset == 0) {
            return;
        }
        target.offsetTopAndBottom(offset);
        refreshHeader.offsetTopAndBottom(offset);
        lastTargetOffsetTop = currentTargetOffsetTop;
        currentTargetOffsetTop = target.getTop();
//        Log.e(TAG, "moveSpinner: currentTargetOffsetTop = "+ currentTargetOffsetTop);
        invalidate();
    }

    private void sendCancelEvent() {
        if (lastEvent == null) {
            return;
        }
        MotionEvent ev = MotionEvent.obtain(lastEvent);
        ev.setAction(MotionEvent.ACTION_CANCEL);
        super.dispatchTouchEvent(ev);
    }

    private void onSecondaryPointerUp(MotionEvent ev) {
        final int pointerIndex = MotionEventCompat.getActionIndex(ev);
        final int pointerId = MotionEventCompat.getPointerId(ev, pointerIndex);
        if (pointerId == activePointerId) {
            // This was our active pointer going up. Choose a new
            // active pointer and adjust accordingly.
            final int newPointerIndex = pointerIndex == 0 ? 1 : 0;
            lastMotionY = ev.getY(newPointerIndex);
            lastMotionX = ev.getX(newPointerIndex);
            activePointerId = MotionEventCompat.getPointerId(ev, newPointerIndex);
        }
    }

    public boolean canChildScrollUp() {
        if (android.os.Build.VERSION.SDK_INT < 14) {
            if (target instanceof AbsListView) {
                final AbsListView absListView = (AbsListView) target;
                return absListView.getChildCount() > 0
                        && (absListView.getFirstVisiblePosition() > 0 || absListView.getChildAt(0)
                        .getTop() < absListView.getPaddingTop());
            } else {
                return ViewCompat.canScrollVertically(target, -1) || target.getScrollY() > 0;
            }
        } else {
            return ViewCompat.canScrollVertically(target, -1);
        }
    }


    private class AutoScroll implements Runnable {
        private Scroller scroller;
        private int lastY;

        public AutoScroll() {
            scroller = new Scroller(getContext());
        }

        @Override
        public void run() {
            boolean finished = !scroller.computeScrollOffset() || scroller.isFinished();
            if (!finished) {
                int currY = scroller.getCurrY();
                int offset = currY - lastY;
                lastY = currY;
                moveSpinner(offset);
                post(this);
                onScrollFinish(false);
            } else {
                stop();
                onScrollFinish(true);
            }
        }

        public void scrollTo(int to, int duration) {
            int from = currentTargetOffsetTop;
            int distance = to - from;
            stop();
            if (distance == 0) {
                return;
            }
            scroller.startScroll(0, 0, 0, distance, duration);
            post(this);
        }

        private void stop() {
            removeCallbacks(this);
            if (!scroller.isFinished()) {
                scroller.forceFinished(true);
            }
            lastY = 0;
        }
    }

    /**
     * 在scroll结束的时候会回调这个方法
     *
     * @param isForceFinish 是否是强制结束的
     */
    private void onScrollFinish(boolean isForceFinish) {
        if (isAutoRefresh && !isForceFinish) {
            isAutoRefresh = false;
            changeState(State.LOADING);
            if (refreshListener != null) {
                refreshListener.onRefresh();
            }
            finishSpinner();
        }
    }

    public interface OnRefreshListener {
        void onRefresh();
    }

    public enum State {
        RESET, PULL, LOADING, COMPLETE
    }

}

基本下拉OK了.现在在巨人肩膀上我来模仿这个正版的头部和波浪的下拉刷新
先得来个波浪:
代码如下:

package com.ccstest.views;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.DrawFilter;
import android.graphics.Paint;
import android.graphics.PaintFlagsDrawFilter;
import android.graphics.Path;
import android.util.AttributeSet;
import android.view.View;

public class WaveView3 extends View {

    private Path mAbovePath,mBelowWavePath;
    private Paint mAboveWavePaint,mBelowWavePaint;

    private DrawFilter mDrawFilter;

    private float φ;

    private OnWaveAnimationListener mWaveAnimationListener;

    public WaveView3(Context context, AttributeSet attrs) {
        super(context, attrs);
        //初始化路径
        mAbovePath = new Path();
        mBelowWavePath = new Path();
        //初始化上面的画笔
        mAboveWavePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        mAboveWavePaint.setAntiAlias(true);
        mAboveWavePaint.setStyle(Paint.Style.FILL);
        mAboveWavePaint.setColor(Color.WHITE);
        //初始化下面的画笔
        mBelowWavePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        mBelowWavePaint.setAntiAlias(true);
        mBelowWavePaint.setStyle(Paint.Style.FILL);
        mBelowWavePaint.setColor(Color.WHITE);
        mBelowWavePaint.setAlpha(80);
        //画布抗锯齿
        mDrawFilter = new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG);
    }

    @Override
    protected void onDraw(Canvas canvas) {

        canvas.setDrawFilter(mDrawFilter);

        mAbovePath.reset();//清除画笔中的内容
        mBelowWavePath.reset();

        φ-=0.1f;

        float y,y2;

        double ω = 6*Math.PI / getWidth();

        mAbovePath.moveTo(getLeft(),getBottom());
        mBelowWavePath.moveTo(getLeft(),getBottom());
        for (float x = 0; x <= getWidth(); x += 20) {
            /**
             *  y=Asin(ωx+φ)+k
             *  A—振幅越大,波形在y轴上最大与最小值的差值越大
             *  ω—角速度, 控制正弦周期(单位角度内震动的次数)
             *  φ—初相,反映在坐标系上则为图像的左右移动。这里通过不断改变φ,达到波浪移动效果
             *  k—偏距,反映在坐标系上则为图像的上移或下移。
             */
            y = (float) (8 * Math.cos(ω * x + φ) +8);
            y2 = (float) (8 * Math.sin(ω * x + φ));
            mAbovePath.lineTo(x, y);
            mBelowWavePath.lineTo(x, y2);
            //回调 把y坐标的值传出去(在activity里面接收让小机器人随波浪一起摇摆)
//            mWaveAnimationListener.OnWaveAnimation(y);
        }
        mAbovePath.lineTo(getRight(),getBottom());
        mBelowWavePath.lineTo(getRight(),getBottom());

        canvas.drawPath(mAbovePath,mAboveWavePaint);
        canvas.drawPath(mBelowWavePath,mBelowWavePaint);

        postInvalidateDelayed(10);

    }

    public void setOnWaveAnimationListener(OnWaveAnimationListener l){
        this.mWaveAnimationListener = l;
    }

    public interface OnWaveAnimationListener{
        void OnWaveAnimation(float y);
    }

}

然后呢,基本上就OK了.
接下来把布局和activity中的代码贴下:
布局:

<?xml version="1.0" encoding="utf-8"?>
<com.ccstest.views.RefreshLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/sw"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:addStatesFromChildren="true"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    >

    <android.support.design.widget.CoordinatorLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:fitsSystemWindows="true"
        tools:context="com.ccstest.activity.ScrollingActivity">

        <android.support.design.widget.AppBarLayout
            android:id="@+id/app_bar"
            android:layout_width="match_parent"
            android:layout_height="@dimen/app_bar_height"
            android:fitsSystemWindows="true"
            android:theme="@style/AppTheme.AppBarOverlay">

            <android.support.design.widget.CollapsingToolbarLayout
                android:id="@+id/toolbar_layout"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:background="@drawable/wallet_bg4"
                android:fitsSystemWindows="true"
                app:contentScrim="?attr/colorPrimary"
                app:layout_scrollFlags="scroll|exitUntilCollapsed"
                >

                <LinearLayout
                    android:id="@+id/llllll"
                    android:layout_width="match_parent"
                    android:layout_height="80dp"
                    android:orientation="horizontal"
                    android:visibility="gone"
                    >

                    <ImageView
                        android:layout_width="20dp"
                        android:layout_height="20dp"
                        android:layout_marginLeft="30dp"
                        android:src="@drawable/player_btn_share"
                        />

                    <View
                        android:layout_width="0dp"
                        android:layout_height="0dp"
                        android:layout_weight="1"/>

                    <ImageView
                        android:layout_width="20dp"
                        android:layout_height="20dp"
                        android:layout_marginRight="30dp"
                        android:src="@drawable/player_btn_share"
                        />
                </LinearLayout>

                <ImageView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_gravity="left|center"
                    android:layout_marginLeft="30dp"
                    android:src="@drawable/icon_heart"
                    />

                <ImageView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_alignParentRight="true"
                    android:layout_centerVertical="true"
                    android:layout_gravity="right|center"
                    android:layout_marginRight="30dp"
                    android:src="@drawable/icon_heart"
                    />

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_gravity="center|bottom"
                    android:layout_marginBottom="10dp"
                    android:text="注册/登录"
                    android:textSize="16sp"
                    />

                <android.support.v7.widget.Toolbar
                    android:id="@+id/toolbar"
                    android:layout_width="match_parent"
                    android:layout_height="?attr/actionBarSize"
                    app:layout_collapseMode="pin"
                    app:popupTheme="@style/AppTheme.PopupOverlay">

                    <RelativeLayout
                        android:layout_width="match_parent"
                        android:layout_height="match_parent">

                    </RelativeLayout>
                </android.support.v7.widget.Toolbar>

                <com.sloydev.collapsingavatartoolbar.CollapsingAvatarToolbar
                    android:id="@+id/avatartoolbar"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    app:collapsedImageSize="30dp"
                    app:collapsedPadding="2dp"
                    app:expandedImageSize="60dp"
                    app:expandedPadding="2dp"
                    >

                    <LinearLayout
                        android:id="@+id/ll"
                        android:layout_width="match_parent"
                        android:layout_height="match_parent"
                        android:gravity="center_horizontal"
                        android:orientation="horizontal">

                        <de.hdodenhof.circleimageview.CircleImageView
                            android:id="@id/cat_avatar"
                            android:layout_width="60dp"
                            android:layout_height="60dp"
                            android:layout_marginBottom="12dp"
                            android:src="@drawable/icon"
                            app:border_color="#fff"
                            app:border_width="2dp"
                            />

                        <TextView
                            android:id="@id/cat_title"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:text=""
                            />
                    </LinearLayout>

                </com.sloydev.collapsingavatartoolbar.CollapsingAvatarToolbar>

                <com.ccstest.views.WaveView3
                    android:id="@+id/wave_view"
                    android:layout_width="match_parent"
                    android:layout_height="10dp"
                    android:layout_gravity="bottom"
                    android:visibility="gone"
                    />
            </android.support.design.widget.CollapsingToolbarLayout>
        </android.support.design.widget.AppBarLayout>

        <include layout="@layout/content_scrolling"/>

    </android.support.design.widget.CoordinatorLayout>
</com.ccstest.views.RefreshLayout>

哎,简书说我文章太长了,需要源码的同志们留下

Android