Android编程中PopupWindow的用法分析【位置、动画、焦点】

//创建一个包含自定义view的PopupWindow
private PopupWindow makePopupWindow(Context cx) {
  PopupWindow window;
  window = new PopupWindow(cx);
  TextView contentView = new TextView(cx);
  contentView.setGravity(Gravity.CENTER);
  final Resources res = cx.getResources();
  // contentView.setBackgroundColor(R.color.page_window_bgcolor);
  // window.setBackgroundDrawable(new
  // ColorDrawable(res.getColor(R.color.page_window_bgcolor)));
  contentView.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT,
      LayoutParams.WRAP_CONTENT));
  //设置PopupWindow显示和隐藏时的动画
  window.setAnimationStyle(R.style.AnimationFade);
  //设置PopupWindow的大小（宽度和高度）
  window.setWidth(res.getDimensionPixelSize(R.dimen.page_window_width));
  window.setHeight(res.getDimensionPixelSize(R.dimen.page_window_height));
  //设置PopupWindow的内容view
  window.setContentView(contentView);
    //设置PopupWindow外部区域是否可触摸
    window.setOutsideTouchable(true);
  return window;
}

<!-- PopupWindow窗口淡入淡出动画 -->
<style name="AnimationFade">
  <item name="android:windowEnterAnimation">@anim/fade_in</item>
  <item name="android:windowExitAnimation">@anim/fade_out</item>
</style>

window.setAnimationStyle(R.style.AnimationFade);

window.setFocusable(true); //设置PopupWindow可获得焦点
window.setTouchable(true); //设置PopupWindow可触摸
window.setOutsideTouchable(true); //设置非PopupWindow区域可触摸

window.showAtLocation();
window.showAsDropDown();