PopupWindow

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弹窗控件，可定义其尺寸、弹出位置、内容等；

Activiy代码：
public class PopupWindowTest{

    private void ivBtn;
    private LinearLayout llContent;
    private int n;
    private PopupWindow window;

    public void onCreate(Bundle savedInstance){
    super.onCreate(savedInstance);
    setContentView(R.layout.main);

    ivBtn=(ImageView)findViewById(R.id.iv_btn);
      llContent=(LinearLayout)findViewById(R.id.ll_content);

      ivBtn.setOnClickListener(new OnClickListener(){
          n++;
            if(n%2==1){
              popupWindow();
            }else{
              window.dismiss();
            }
        });
    }

    private void popupWindow(){
      window=new PopupWindow();
      TextView contentView=LayoutInflater.from(this).inflate(R.layout.popup_content);

    window.setWidth(200);
      window.setHeight(80);
      window.setContentView(contentView);
      window.setAnimationStyle(R.style.AnimationFade);
        window.setBackgroundDrawable(new BitmapDrawable());//没有这一句，则window会独占焦点，导致其它控件失灵
        window.setFocusable(true);
        window.setOutsideTouchable(true);
        //锚点依附在llContent的右下角，左上方向各偏移10
        window.showAtLocation(llContent,Gravity.RIGHT|Gravity.BOTTOM,10,10);
    }
}

动画资源文件：res/values/styles.xml
<?xml version="1.0" encoding="utf-8"?>
<resources xmlns:android="http://schemas.android.com/apk/res/android">
    <style name="AnimationFade">
        <item android:windowEnterAnimation>@android:anim/fade_in</item>
        <item android:windowExitAnimation>@android:anim/fade_out</item>
    </style>
</resources>

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