Android开发中实现一个弹出框的方法

/**
 * 仿易信动画弹出框
 */
public class MainActivity extends ActionBarActivity {
  //用于标记页面顶端位置
  private View topView;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    topView = findViewById(R.id.main_top);
  }
  private PopupWindow popupWindow;
  private int line1DeltaY, line2DeltaY;
  //仿易信更多弹出框
  private void showPopup() {
    if (popupWindow == null) {
      View contentView = LayoutInflater.from(this).inflate(R.layout.yixin_pop_layout, null);
      //点击空白区域关闭
      View blankView = contentView.findViewById(R.id.yixin_more_blank);
      View blankView2 = contentView.findViewById(R.id.yixin_more_blank2);
      initItems(contentView);
      //测量高度
      int line2Height = ViewUtils.getViewMeasuredHeight(itemViews[0]);
      line1DeltaY = -getActionBarHeight() - 40;
      line2DeltaY = line1DeltaY - line2Height;
      blankView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
          dismissPopup();
        }
      });
      blankView2.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
          dismissPopup();
        }
      });
      popupWindow = new PopupWindow(contentView, ScreenUtils.getScreenW(this), ScreenUtils.getScreenH(this));
      //随便设置一个drawable作为背景
      popupWindow.setBackgroundDrawable(new ColorDrawable());
    }
    if (!popupWindow.isShowing()) {
      popupWindow.showAsDropDown(topView, 0, 0);
      for (int i = 0; i < itemViews.length; i++) {
        if (i < 3) {
          //第一行
          itemViews[i].startAnimation(AnimationHelper.createPopupAnimIn(this, line1DeltaY));
        } else {
          //第二行
          itemViews[i].startAnimation(AnimationHelper.createPopupAnimIn(this, line2DeltaY));
        }
      }
      popupWindow.getContentView().startAnimation(AnimationHelper.createPopupBgFadeInAnim());
    }
  }
  private void dismissPopup() {
    if (popupWindow == null || !popupWindow.isShowing()) {
      return;
    }
    ViewGroup contentView = (ViewGroup) popupWindow.getContentView();
    contentView.startAnimation(AnimationHelper.createPopupBgFadeOutAnim(AnimationHelper.TIME_OUT));
    for (int i = 0; i < itemViews.length; i++) {
      if (i < 3) {
        //第一行
        itemViews[i].startAnimation(AnimationHelper.createPopupAnimOut(this, line1DeltaY));
      } else {
        //第二行
        itemViews[i].startAnimation(AnimationHelper.createPopupAnimOut(this, line2DeltaY));
      }
    }
    //动画结束时隐藏popupWindow
    contentView.postDelayed(new Runnable() {
      @Override
      public void run() {
        popupWindow.dismiss();
      }
    }, AnimationHelper.TIME_OUT + 10);
  }
  private View[] itemViews;
  //初始化popupWindow上的按钮
  private void initItems(View parent) {
    int[] viewIds = new int[]{R.id.yixin_more_item1, R.id.yixin_more_item2, R.id.yixin_more_item3,
        R.id.yixin_more_item4, R.id.yixin_more_item5, R.id.yixin_more_item6};
    itemViews = new View[viewIds.length];
    int itemWidth = ScreenUtils.getScreenW(this) / 3;
    OnClickImpl l = new OnClickImpl();
    for (int i = 0; i < viewIds.length; i++) {
      int id = viewIds[i];
      itemViews[i] = parent.findViewById(id);
      GridLayout.LayoutParams p = (GridLayout.LayoutParams) itemViews[i].getLayoutParams();
      p.width = itemWidth;
      itemViews[i].setLayoutParams(p);
      itemViews[i].setOnClickListener(l);
    }
  }
  private class OnClickImpl implements View.OnClickListener {
    @Override
    public void onClick(View v) {
      final int viewId = v.getId();
      //背景动画
      popupWindow.getContentView().startAnimation(AnimationHelper.createPopupBgFadeOutAnim(AnimationHelper.TIME_OUT_CLICK));
      //动画结束时隐藏popupWindow
      v.postDelayed(new Runnable() {
        @Override
        public void run() {
          popupWindow.dismiss();
          //动画结束时响应点击事件
          handleEvent(viewId);
        }
      }, AnimationHelper.TIME_OUT_CLICK + 10);
      //按钮动画
      for (View item : itemViews) {
        if (item.getId() == v.getId()) {
          //点击的按钮，放大
          item.startAnimation(AnimationHelper.createPopupItemBiggerAnim(MainActivity.this));
        } else {
          //其它按钮，缩小
          item.startAnimation(AnimationHelper.createPopupItemSmallerAnim(MainActivity.this));
        }
      }
    }
  }
  //popupWindow上按钮的点击事件
  private void handleEvent(int viewId) {
    Toast.makeText(this, "点击了按钮：" + viewId, Toast.LENGTH_SHORT).show();
  }
  private int getActionBarHeight() {
    return getSupportActionBar().getHeight();
  }
  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.menu_main, menu);
    return true;
  }
  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    int id = item.getItemId();
    if (id == R.id.action_more) {
      if (popupWindow == null || !popupWindow.isShowing()) {
        showPopup();
      } else {
        dismissPopup();
      }
      return true;
    }
    return super.onOptionsItemSelected(item);
  }
  //点击返回键时，如果popupWindow是显示状态，则关闭它
  @Override
  public void onBackPressed() {
    if (popupWindow != null && popupWindow.isShowing()) {
      dismissPopup();
      return;
    }
    super.onBackPressed();
  }
}

/**
 * AnimationHelper
 */
public class AnimationHelper {
  /**
   * 进入动画的时间
   */
  public static final int TIME_IN = 300;
  /**
   * 进入动画之后的反弹动画时间
   */
  public static final int TIME_IN_BACK = 100;
  /**
   * 退出动画的时间
   */
  public static final int TIME_OUT = 300;
  /**
   * 点击PopupWindow上菜单后退出动画的时间
   */
  public static final int TIME_OUT_CLICK = 500;
  /**
   * PopupWindow上菜单进入动画
   */
  public static Animation createPopupAnimIn(Context context, int fromYDelta) {
    AnimationSet animationSet = new AnimationSet(context, null);
//    animationSet.setInterpolator(new BounceInterpolator()); //结束时弹跳
    animationSet.setFillAfter(true);
    //移动
    TranslateAnimation translateAnim = new TranslateAnimation(0, 0, fromYDelta, 20);
    translateAnim.setDuration(TIME_IN);
    animationSet.addAnimation(translateAnim);
    //回弹效果
    TranslateAnimation translateAnim2 = new TranslateAnimation(0, 0, 0, -20);
    translateAnim2.setStartOffset(TIME_IN);
    translateAnim2.setDuration(TIME_IN_BACK);
    animationSet.addAnimation(translateAnim2);
    return animationSet;
  }
  /**
   * PopupWindow上菜单离开动画
   */
  public static Animation createPopupAnimOut(Context context, int toYDelta) {
    AnimationSet animationSet = new AnimationSet(context, null);
    animationSet.setFillAfter(true);
    TranslateAnimation translateAnim = new TranslateAnimation(0, 0, 0, toYDelta);
    translateAnim.setDuration(TIME_OUT);
    animationSet.addAnimation(translateAnim);
    return animationSet;
  }
  /**
   * PopupWindow背景进入动画（透明度渐变）
   */
  public static Animation createPopupBgFadeInAnim() {
    AlphaAnimation anim = new AlphaAnimation(0, 1.0f);
    anim.setDuration(TIME_IN);
    anim.setFillAfter(true);
    return anim;
  }
  /**
   * PopupWindow背景离开动画（透明度渐变）
   */
  public static Animation createPopupBgFadeOutAnim(int duration) {
    AlphaAnimation anim = new AlphaAnimation(1.0f, 0);
    anim.setDuration(duration);
    anim.setFillAfter(true);
    return anim;
  }
  /**
   * PopupWindow按钮点击动画
   */
  public static Animation createPopupItemBiggerAnim(Context context) {
    AnimationSet animationSet = new AnimationSet(context, null);
    animationSet.setFillAfter(true);
    //放大(设置缩放的中心点为自己的中心)
    ScaleAnimation scaleAnim = new ScaleAnimation(1.0f, 2.0f, 1.0f, 2.0f,
        Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
    scaleAnim.setDuration(TIME_OUT_CLICK);
    animationSet.addAnimation(scaleAnim);
    //渐变
    AlphaAnimation alphaAnim = new AlphaAnimation(1.0f, 0);
    alphaAnim.setInterpolator(new AccelerateInterpolator());
    alphaAnim.setDuration(TIME_OUT_CLICK);
    animationSet.addAnimation(alphaAnim);
    return animationSet;
  }
  /**
   * PopupWindow按钮点击时其它按钮的动画
   */
  public static Animation createPopupItemSmallerAnim(Context context) {
    //放大(设置缩放的中心点为自己的中心)
    ScaleAnimation scaleAnim = new ScaleAnimation(1.0f, 0, 1.0f, 0,
        Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
    scaleAnim.setDuration(TIME_OUT_CLICK);
    scaleAnim.setFillAfter(true);
    return scaleAnim;
  }
}