Android 固定式底部上滑抽屉view

1、自定义view BottomDrawerLayout

/*** 作者：created by meixi* 邮箱：15913707499@163.com* 日期：2018/12/10 11*/public class BottomDrawerLayout extends ViewGroup {private static final String TAG = "BottomDrawerLayout";private View mDrawerView;private View mBottomView;private View mRotateView;private ViewDragHelper mDragHelper;private float mInitialX;private float mInitialY;private int mTouchSlop;private int mCurTop=-1;private int mBottomHeight;private int mDrawerHeight;private int mParentHeight;private float mDragOffset = 1;private boolean isUnderBottomView = false;private boolean isUnderDrawerView = false;private OnDrawerStatusChanged onDrawerStatusChanged;public BottomDrawerLayout(Context context) {super(context);init(context);}public BottomDrawerLayout(Context context, AttributeSet attrs) {super(context, attrs);init(context);}public BottomDrawerLayout(Context context, AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);init(context);}private void init(Context context) {mDragHelper = ViewDragHelper.create(this, 1.0f,new DragerCallBack());mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();}public void setOnDrawerStatusChanged(OnDrawerStatusChanged onDrawerStatusChanged) {this.onDrawerStatusChanged = onDrawerStatusChanged;}public void switchDrawer() {if(mDragOffset<1){minimize();}else{maximize();}}private class DragerCallBack extends  ViewDragHelper.Callback{//从底部到顶部的顺序遍历子view@Overridepublic int getOrderedChildIndex(int index) {int childCount = BottomDrawerLayout.this.getChildCount();int newIndex = childCount - index -1;return  newIndex;}@Overridepublic boolean tryCaptureView(View child, int pointerId) {return child == mDrawerView;}@Overridepublic int clampViewPositionHorizontal(View child, int left, int dx) {
//            Log.d(TAG, "clampViewPositionHorizontal " + left + "," + dx);
//            final int leftBound  = getPaddingLeft();
//            final int rightBound = getWidth() - mBottomView.getWidth() - leftBound;
//            //坐标系三种情况
//            final int newLeft = Math.min(Math.max(left, leftBound), rightBound);
//
//            return newLeft;return super.clampViewPositionHorizontal(child, left, dx);}//要想上下拖动必须重写此方法@Overridepublic int clampViewPositionVertical(View child, int top, int dy) {
//            Log.d(TAG, "clampViewPositionVertical " + top + "," + dy);final int topBound = getHeight() - mDrawerView.getMeasuredHeight() - mBottomView.getHeight();final int bottomBound = getHeight()  - mBottomView.getHeight();final int newTop = Math.min(Math.max(top, topBound), bottomBound);return newTop;}@Overridepublic void onViewCaptured(View capturedChild, int activePointerId) {super.onViewCaptured(capturedChild, activePointerId);}@Overridepublic void onViewReleased(View releasedChild, float xvel, float yvel) {//            Log.i(TAG, "onViewReleased:" + "xvel:" + xvel + ",yvel:" + yvel);//yvel Fling产生的值，yvel > 0 则是快速往下Fling || yvel < 0 则是快速往上Flingint top = mParentHeight - mDrawerHeight - mBottomHeight;if (yvel > 0 || (yvel == 0 && mDragOffset > 0.5f)/* 后面这个小括号里判断处理拖动之后停下来但是未松手的情况 */) {top += mDrawerHeight;}mDragHelper.settleCapturedViewAt(releasedChild.getLeft(), top);invalidate();//important 不加，就不会刷新View的位置}@Overridepublic void onViewDragStateChanged(int state) {super.onViewDragStateChanged(state);}@Overridepublic void onViewPositionChanged(View changedView, int left, int top, int dx, int dy) {mCurTop = top;mDragOffset = ((float) top -(mParentHeight - mDrawerHeight - mBottomHeight))/ mDrawerHeight;
//            Log.d(TAG, "onViewPositionChanged: mDragOffset:" + mDragOffset);//旋转与透明跟随效果mDrawerView.setAlpha(1-mDragOffset);
//            mRotateView.setRotation((1-mDragOffset)*180);requestLayout();if (onDrawerStatusChanged != null) {onDrawerStatusChanged.onChanged(mParentHeight,top);}//            if(onDrawerStatusChanged !=null){
//                if(mDragOffset == 0 || mDragOffset == 1){
//                    onDrawerStatusChanged.onChanged(mParentHeight,top);
//                }
//            }}}public interface OnDrawerStatusChanged{void onChanged(int parentHeight, int drawerTop);}public void maximize(){smoothSlideTo(0.0f);}public void minimize(){smoothSlideTo(1.0f);}private boolean smoothSlideTo(float slideOffset) {final int topBound = mParentHeight - mDrawerHeight - mBottomHeight;int y = (int) (topBound + slideOffset * mDrawerHeight);if(mDragHelper.smoothSlideViewTo(mDrawerView, mDrawerView.getLeft(), y)){ViewCompat.postInvalidateOnAnimation(this);return true;}return false;}@Overridepublic boolean dispatchTouchEvent(MotionEvent ev) {return super.dispatchTouchEvent(ev);}@Overridepublic boolean onInterceptTouchEvent(MotionEvent event) {int act = MotionEventCompat.getActionMasked(event);
//        final int action = event.getAction();switch (act) {//由于很多情况不能拦截事件，这种时候系统不会调用onTouchEvent()// 手动把事件传递给mDragHelper.processTouchEventcase MotionEvent.ACTION_DOWN:mInitialX = event.getX();mInitialY = event.getY();//Feed the down event to the detector so it has// context when/if dragging begins
//                mDetector.onTouchEvent(event);mDragHelper.processTouchEvent(event);isUnderBottomView = mDragHelper.isViewUnder(mBottomView, (int)mInitialX, (int)mInitialY);isUnderDrawerView = mDragHelper.isViewUnder(mDrawerView, (int)mInitialX, (int)mInitialY);break;case MotionEvent.ACTION_POINTER_DOWN:mDragHelper.processTouchEvent(event) ;break;case MotionEvent.ACTION_POINTER_UP:mDragHelper.processTouchEvent(event) ;break;case MotionEvent.ACTION_MOVE:final float x = event.getX();final float y = event.getY();final int yDiff = (int) Math.abs(y - mInitialY);final int xDiff = (int) Math.abs(x - mInitialX);//Verify that either difference is enough to be a dragif ((yDiff > mTouchSlop || xDiff > mTouchSlop) && (isUnderBottomView || isUnderDrawerView) ){//Start capturing eventsreturn true;}break;}//父类是viewgroup，返回的falsereturn super.onInterceptTouchEvent(event);}@Overridepublic boolean onTouchEvent(MotionEvent event) {mDragHelper.processTouchEvent(event);//down事件返回false，让其底部的平行层级的view能够接收到点击事件switch (event.getAction()) {case MotionEvent.ACTION_DOWN:return false;case MotionEvent.ACTION_UP:return false;//只有当手指达到拖动阈值时this才确定消耗此系列事件//若未达到阈值也返回true，则与其平行的view不会收到click事件case MotionEvent.ACTION_MOVE:final float x = event.getX();final float y = event.getY();final int yDiff = (int) Math.abs(y - mInitialY);final int xDiff = (int) Math.abs(x - mInitialX);//Verify that either difference is enough to be a dragif ((yDiff > mTouchSlop || xDiff > mTouchSlop) && (isUnderBottomView || isUnderDrawerView) ){//Start capturing eventsreturn true;}break;}return false;}@Overrideprotected void onFinishInflate() {super.onFinishInflate();mBottomView = findViewById(R.id.layout_bottom_bar);mDrawerView = findViewById(R.id.layout_price_detail);//        mRotateView = findViewById(R.id.img_spread_out);mBottomView.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {maximize();}});mDrawerView.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {minimize();}});}@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {measureChildren(widthMeasureSpec,heightMeasureSpec);super.onMeasure(widthMeasureSpec, heightMeasureSpec);}@Overrideprotected void onLayout(boolean changed, int l, int t, int r, int b) {mParentHeight = this.getHeight();mBottomHeight = mBottomView.getMeasuredHeight();mDrawerHeight = mDrawerView.getMeasuredHeight();
//        Log.d(TAG, "onLayout: drawHeight:"+drawHeight);mBottomView.layout(l,mParentHeight - mBottomHeight,r,b);if(mCurTop == -1){mCurTop = mParentHeight - mBottomHeight;}mDrawerView.layout(l,mCurTop,r,mCurTop + mDrawerHeight);}@Overridepublic void computeScroll() {if(mDragHelper.continueSettling(true)){ViewCompat.postInvalidateOnAnimation(this);}}
}

layout布局中使用这个自定义抽屉view即可，第一个LinearLayout是抽屉内容，第二个LinearLayout是固定底部把手

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent" android:layout_height="match_parent"><com.tianxin.shanghuact.BottomDrawerLayoutandroid:id="@+id/bottom_drawer_layout"android:layout_width="match_parent"android:layout_height="match_parent"><LinearLayoutandroid:id="@+id/layout_price_detail"android:layout_width="match_parent"android:background="@color/colorPrimary"android:orientation="horizontal"android:layout_height="180dp"></LinearLayout><LinearLayoutandroid:id="@+id/layout_bottom_bar"android:layout_width="match_parent"android:background="@color/transparent"android:orientation="horizontal"android:layout_height="40dp"></LinearLayout></com.tianxin.shanghuact.BottomDrawerLayout></RelativeLayout>

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