可上下拖动且有浮沉动画的View

package com.ifenglian.superapp1;

import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.ObjectAnimator;
import android.content.Context;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.FrameLayout;
import android.widget.RelativeLayout;

/**
 * 可上下拖动且有浮沉动画的View
 * create by shixm on 2017/5/17 15:11
 */
public class SHDrawerAnimLayerLayout extends FrameLayout {

    private static final String OBJECT_ANIMATION_PROPERTY_NAME = "translationY";

    // 可拖动的顶部View
    private View viewTopDragView;
    // 可拖动的底部View
    private View viewBottomDragView;

    // View在关状态，露出的高度
    private int viewVisibleHeight = 50;
    // 可识别触摸事件的高度
    private int touchHeight = 50;
    // 顶部View偏移Y
    private int topViewTranslationY;
    // 底部View偏移Y
    private int bottomViewTranslationY;
    // 顶部View是否在触摸范围
    private boolean isTopViewInRect;
    // 底部View是否在触摸范围
    private boolean isBottomViewInRect;

    public SHDrawerAnimLayerLayout(Context context, View topView, View bottomView) {
        this(context);
        setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT));
        addView(topView);
        addView(bottomView);
        viewTopDragView = topView;
        viewBottomDragView = bottomView;
        viewTopDragView.setAlpha(1);
        viewBottomDragView.setAlpha(0);
    }

    public SHDrawerAnimLayerLayout(Context context) {
        super(context, null);
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        super.onLayout(changed, l, t, r, b);
        topViewTranslationY = - viewVisibleHeight;
        viewTopDragView.setY(topViewTranslationY);
        bottomViewTranslationY = viewVisibleHeight;
        viewBottomDragView.setY(bottomViewTranslationY);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        super.onTouchEvent(event);
        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                float downX = event.getX();
                float downY = event.getY();
                if (!isInTopViewRect(downX, downY)) {
                    isTopViewInRect = false;
                } else {
                    isTopViewInRect = true;
                }
                if (!isInBottomViewRect(downX, downY)) {
                    isBottomViewInRect = false;
                } else {
                    isBottomViewInRect = true;
                }
                break;
            case MotionEvent.ACTION_MOVE:
                if (isTopViewInRect) {
                    float moveY = event.getY();
                    if (moveY >= 0 && moveY < getHeight()) {
                        viewTopDragView.setY(-getHeight() + moveY);
                        float alpha = moveY / getHeight();
                        viewTopDragView.setAlpha(alpha);
                        viewBottomDragView.setAlpha(1 - alpha);
                    }
                }
                if (isBottomViewInRect) {
                    float moveY = event.getY();
                    if (moveY >= 0 && moveY < getHeight()) {
                        viewBottomDragView.setY(moveY);
                        float alpha = moveY / getHeight();
                        viewTopDragView.setAlpha(alpha);
                        viewBottomDragView.setAlpha(1 - alpha);
                    }
                }
                break;
            case MotionEvent.ACTION_UP:
            case MotionEvent.ACTION_CANCEL:
                if (isTopViewInRect) {
                    if (viewTopDragView.getTranslationY() < -getHeight() / 2) {
                        topViewScrollToTop();
                    } else {
                        topViewScrollToBottom();
                    }
                    isTopViewInRect = false;
                }
                if (isBottomViewInRect) {
                    if (viewBottomDragView.getTranslationY() < getHeight() / 2) {
                        bottomViewScrollToTop();
                    } else {
                        bottomViewScrollToBottom();
                    }
                    isBottomViewInRect = false;
                }
                break;
        }
        return true;
    }

    private void bottomViewScrollToTop() {
        ObjectAnimator topAnimation = ObjectAnimator.ofFloat(viewBottomDragView, OBJECT_ANIMATION_PROPERTY_NAME, viewBottomDragView.getTranslationY(), viewVisibleHeight);
        topAnimation.start();
    }

    private void topViewScrollToTop() {
        ObjectAnimator topAnimation = ObjectAnimator.ofFloat(viewTopDragView, OBJECT_ANIMATION_PROPERTY_NAME, viewTopDragView.getTranslationY(), -getHeight() + viewVisibleHeight);
        topAnimation.addListener(new AnimatorListenerAdapter() {
            @Override
            public void onAnimationEnd(Animator animation) {
                ObjectAnimator.ofFloat(viewTopDragView, OBJECT_ANIMATION_PROPERTY_NAME, viewTopDragView.getTranslationY(), -viewVisibleHeight).setDuration(0).start();
                viewTopDragView.setAlpha(0);
            }
        });
        topAnimation.start();
    }

    private void bottomViewScrollToBottom() {
        ObjectAnimator bottomAnimation = ObjectAnimator.ofFloat(viewBottomDragView, OBJECT_ANIMATION_PROPERTY_NAME, viewBottomDragView.getTranslationY(), getHeight() - bottomViewTranslationY);
        bottomAnimation.addListener(new AnimatorListenerAdapter() {
            @Override
            public void onAnimationEnd(Animator animation) {
                viewBottomDragView.setAlpha(0);
                ObjectAnimator.ofFloat(viewBottomDragView, OBJECT_ANIMATION_PROPERTY_NAME, viewBottomDragView.getTranslationY(), bottomViewTranslationY).setDuration(0).start();
                viewTopDragView.setAlpha(1);
            }
        });
        bottomAnimation.start();
    }

    private void topViewScrollToBottom() {
        ObjectAnimator bottomAnimation = ObjectAnimator.ofFloat(viewTopDragView, OBJECT_ANIMATION_PROPERTY_NAME, viewTopDragView.getTranslationY(), (topViewTranslationY));
        bottomAnimation.addListener(new AnimatorListenerAdapter() {
            @Override
            public void onAnimationEnd(Animator animation) {
                viewBottomDragView.setAlpha(0);
                viewTopDragView.setAlpha(1);
            }
        });
        bottomAnimation.start();
    }

    private boolean isInTopViewRect(float downX, float downY) {
        if (downX > viewTopDragView.getLeft() && downX < viewTopDragView.getRight()) {
            if (downY >= viewTopDragView.getTranslationY() + getHeight() - touchHeight && downY <= viewTopDragView.getTranslationY() + getHeight()) {
                return true;
            }
        }
        return false;
    }

    private boolean isInBottomViewRect(float downX, float downY) {
        if (downX > viewBottomDragView.getLeft() && downX < viewBottomDragView.getRight()) {
            if (downY >= viewBottomDragView.getTranslationY() && downY <= touchHeight + viewBottomDragView.getTranslationY()) {
                return true;
            }
        }
        return false;
    }
}

使用：

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    LinearLayout lin = new LinearLayout(this);
    lin.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));

    RelativeLayout relativeLayout1 = new RelativeLayout(this);
    RelativeLayout.LayoutParams reParams = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, dip2px(this, 310));
    relativeLayout1.setLayoutParams(reParams);
    relativeLayout1.setBackgroundColor(Color.parseColor("#00FF00"));

    RelativeLayout relativeLayout2 = new RelativeLayout(this);
    RelativeLayout.LayoutParams reParams2 = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, dip2px(this, 310));
    relativeLayout2.setLayoutParams(reParams2);
    relativeLayout2.setBackgroundColor(Color.parseColor("#0000FF"));

    SHDrawerAnimLayerLayout dragLayout = new SHDrawerAnimLayerLayout(this, relativeLayout1, relativeLayout2);
    dragLayout.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT));
    dragLayout.setBackgroundColor(Color.parseColor("#000000"));
    lin.addView(dragLayout);

    lin.setBackgroundColor(Color.WHITE);
    setContentView(lin);
}