android实现筛选菜单效果

<style name="Translucent_NoTitle" parent="android:style/Theme.Dialog">
  <item name="android:windowNoTitle">true</item>
  <item name="android:background">#00000000</item>
  <item name="android:windowBackground">@android:color/transparent</item>
  <item name="android:windowAnimationStyle">@null</item>
  <item name="android:windowIsFloating">true</item>
  <item name="android:colorBackgroundCacheHint">@null</item>
  <item name="android:windowIsTranslucent">true</item>
  <item name="android:backgroundDimEnabled">false</item><span style="white-space:pre"> </span>背景暗淡效果
</style>

<style name="Theme.Panel">
  <item name="windowBackground">@color/transparent</item>
  <item name="colorBackgroundCacheHint">@null</item>
  <item name="windowFrame">@null</item>
  <item name="windowContentOverlay">@null</item>
  <item name="windowAnimationStyle">@null</item>
  <item name="windowIsFloating">true</item>
  <item name="backgroundDimEnabled">false</item>
  <item name="windowIsTranslucent">true</item>
  <item name="windowNoTitle">true</item>
</style>

WindowManager.LayoutParams layoutParams = getWindow().getAttributes();
  layoutParams.width = screenWidth;
  layoutParams.height = contentHeight;
  layoutParams.gravity = Gravity.TOP;
  layoutParams.flags |= WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL; //不阻塞事件传递到后面的窗口
  getWindow().setAttributes(layoutParams);

enter = ValueAnimator.ofFloat(0, 1f).setDuration(350);
  enter.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
   @Override
   public void onAnimationUpdate(ValueAnimator animation) {
    dialogContent.setTranslationY((1 - animation.getAnimatedFraction()) * -contentHeight);
   }
  });
 
  out = ValueAnimator.ofFloat(0, 1f).setDuration(350);
  out.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
   @Override
   public void onAnimationUpdate(ValueAnimator animation) {
    dialogContent.setTranslationY(animation.getAnimatedFraction() * -contentHeight);
   }
  });
  out.addListener(new Animator.AnimatorListener() {
   @Override
   public void onAnimationStart(Animator animation) {
 
   }
 
   @Override
   public void onAnimationEnd(Animator animation) {
    dismiss();
   }
 
   @Override
   public void onAnimationCancel(Animator animation) {
 
   }
 
   @Override
   public void onAnimationRepeat(Animator animation) {
 
   }
  });

@Override
 protected void onStart() {
  super.onStart();
  dialogContent.post(new Runnable() {
   @Override
   public void run() {
    enter.start();
   }
  });
 }

public boolean post(Runnable action) {
  final AttachInfo attachInfo = mAttachInfo;
  if (attachInfo != null) {
   return attachInfo.mHandler.post(action);
  }
  // Assume that post will succeed later
  ViewRootImpl.getRunQueue().post(action);
  return true;
 }

@Override
 public boolean onKeyDown(int keyCode, KeyEvent event) {
  if (keyCode == KeyEvent.KEYCODE_BACK) {
   out.start();
   return true;
  }
  return super.onKeyDown(keyCode, event);
 }

public void showAsDropView(View view) {
  WindowManager.LayoutParams lp = getWindow().getAttributes();
  lp.width = screenWidth;
  int[] location = new int[2];
  view.getLocationOnScreen(location);
//  view.getLocationInWindow(location);<span style="white-space:pre"> </span>这里跟上面一句的效果一样，不知有什么区别
  lp.y = location[1]-PhoneConstant.statusHeight+view.getHeight();
  lp.gravity = Gravity.TOP;
  getWindow().setAttributes(lp);
  contentTop = location[1];
  show();
 }

//反射获取状态栏高度
  Class<?> c = null;
  Object obj = null;
  Field field = null;
  int x = 0, sbar = 0;
  try {
   c = Class.forName("com.android.internal.R$dimen");
   obj = c.newInstance();
   field = c.getField("status_bar_height");
   x = Integer.parseInt(field.get(obj).toString());
   PhoneConstant.statusHeight = getResources().getDimensionPixelSize(x);
  } catch(Exception e1) {
   e1.printStackTrace();
  }

Rect outRect = new Rect(); 
activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(outRect);