Android仿zaker用手向上推动的特效开发【推动门效果】(附demo源码下载)

package com.manymore13.scrollerdemo;
import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Color;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.WindowManager;
import android.view.animation.AccelerateInterpolator;
import android.view.animation.BounceInterpolator;
import android.view.animation.Interpolator;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.Scroller;
public class PullDoorView extends RelativeLayout {
 private Context mContext;
 private Scroller mScroller;
 private int mScreenWidth = 0;
 private int mScreenHeigh = 0;
 private int mLastDownY = 0;
 private int mCurryY;
 private int mDelY;
 private boolean mCloseFlag = false;
 private ImageView mImgView;
 public PullDoorView(Context context) {
  super(context);
  mContext = context;
  setupView();
 }
 public PullDoorView(Context context, AttributeSet attrs) {
  super(context, attrs);
  mContext = context;
  setupView();
 }
 @SuppressLint("NewApi")
 private void setupView() {
  // 这个Interpolator你可以设置别的 我这里选择的是有弹跳效果的Interpolator
  Interpolator polator = new BounceInterpolator();
  mScroller = new Scroller(mContext, polator);
  // 获取屏幕分辨率
  WindowManager wm = (WindowManager) (mContext
    .getSystemService(Context.WINDOW_SERVICE));
  DisplayMetrics dm = new DisplayMetrics();
  wm.getDefaultDisplay().getMetrics(dm);
  mScreenHeigh = dm.heightPixels;
  mScreenWidth = dm.widthPixels;
  // 这里你一定要设置成透明背景,不然会影响你看到底层布局
  this.setBackgroundColor(Color.argb(0, 0, 0, 0));
  mImgView = new ImageView(mContext);
  mImgView.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT,
    LayoutParams.MATCH_PARENT));
  mImgView.setScaleType(ImageView.ScaleType.FIT_XY);// 填充整个屏幕
  mImgView.setImageResource(R.drawable.bg1); // 默认背景
  addView(mImgView);
 }
 // 设置推动门背景
 public void setBgImage(int id) {
  mImgView.setImageResource(id);
 }
 // 设置推动门背景
 public void setBgImage(Drawable drawable) {
  mImgView.setImageDrawable(drawable);
 }
 // 推动门的动画
 public void startBounceAnim(int startY, int dy, int duration) {
  mScroller.startScroll(0, startY, 0, dy, duration);
  invalidate();
 }
 @Override
 public boolean onTouchEvent(MotionEvent event) {
  int action = event.getAction();
  switch (action) {
  case MotionEvent.ACTION_DOWN:
   mLastDownY = (int) event.getY();
   System.err.println("ACTION_DOWN=" + mLastDownY);
   return true;
  case MotionEvent.ACTION_MOVE:
   mCurryY = (int) event.getY();
   System.err.println("ACTION_MOVE=" + mCurryY);
   mDelY = mCurryY - mLastDownY;
   // 只准上滑有效
   if (mDelY < 0) {
    scrollTo(0, -mDelY);
   }
   System.err.println("------------- " + mDelY);
   break;
  case MotionEvent.ACTION_UP:
   mCurryY = (int) event.getY();
   mDelY = mCurryY - mLastDownY;
   if (mDelY < 0) {
    if (Math.abs(mDelY) > mScreenHeigh / 2) {
     // 向上滑动超过半个屏幕高的时候 开启向上消失动画
     startBounceAnim(this.getScrollY(), mScreenHeigh, 450);
     mCloseFlag = true;
    } else {
     // 向上滑动未超过半个屏幕高的时候 开启向下弹动动画
     startBounceAnim(this.getScrollY(), -this.getScrollY(), 1000);
    }
   }
   break;
  }
  return super.onTouchEvent(event);
 }
 @Override
 public void computeScroll() {
  if (mScroller.computeScrollOffset()) {
   scrollTo(mScroller.getCurrX(), mScroller.getCurrY());
   Log.i("scroller", "getCurrX()= " + mScroller.getCurrX()
     + "  getCurrY()=" + mScroller.getCurrY()
     + " getFinalY() = " + mScroller.getFinalY());
   // 不要忘记更新界面
   postInvalidate();
  } else {
   if (mCloseFlag) {
    this.setVisibility(View.GONE);
   }
  }
 }
}

<com.manymore13.scrollerdemo.PullDoorView
  android:id="@+id/myImage"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:background="#ddd" >
  <Button
   android:id="@+id/btn_above"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:layout_centerInParent="true"
   android:text="第二层" />
  <TextView
   android:id="@+id/tv_hint"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:layout_alignParentBottom="true"
   android:layout_centerHorizontal="true"
   android:layout_marginBottom="10dp"
   android:text="上滑可以进入首页"
   android:textColor="#ffffffff"
   android:textSize="18sp" />
 </com.manymore13.scrollerdemo.PullDoorView>