Android气泡效果实现方法

<?xml version="1.0" encoding="UTF-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:background="@drawable/pub_pop_bg4"
  android:paddingLeft="10dp"
  android:paddingRight="10dp"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content" >
  <TextView android:id="@+id/bubble_text"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textSize="18dp"
    android:textColor="#000" />
  <!-- 我知道了 -->
  <TextView android:id="@+id/bubble_btn"
    android:gravity="right"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_below="@id/bubble_text"
    android:textSize="20dp"
    android:textColorHighlight="#2151E0"
    android:text=""
    android:textColor="#1A75B9" />
</RelativeLayout>

public class TestBubbleActivity extends Activity {
  /** 全局屏幕的高和宽 */
  private static int SCREEN_WIDTH = 0 ;
  private static int SCREEN_HEIGHT = 0;
  /**气泡显示的详细内容*/
  private TextView tvBubContent = null;
  /**显示 我知道了 的提示*/
  private TextView tvKnow = null;
  /**气泡view 里面包含2个TextView*/
  private View bubbleView = null;
  /**气泡dialog*/
  private Dialog bubbleAlert = null;
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    getDimension();
    bubbleView = getLayoutInflater().inflate(R.layout.overlay_pop, null);
    tvKnow = (TextView)bubbleView.findViewById(R.id.bubble_btn);
    tvKnow.setText(Html.fromHtml("<u>"+"我知道了"+"</u>"));
    tvBubContent = (TextView)bubbleView.findViewById(R.id.bubble_text);
    tvBubContent.setText("上次程序异常退出，正在传输历史数据...");
    tvKnow.setOnClickListener(new View.OnClickListener(){
      @Override
      public void onClick(View v) {
        bubbleAlert.cancel();
      }
    });
    int tmpWidth = SCREEN_WIDTH/5*3;
    int tmpHeight =SCREEN_HEIGHT/8;
    //设置TextView宽度
    tvKnow.setMinWidth(tmpWidth);
    tvBubContent.setMaxWidth(tmpWidth);
    //以指定的样式初始化dialog
    bubbleAlert = new Dialog(this,R.style.bubble_dialog);
    Window win = bubbleAlert.getWindow();//获取所在window
    LayoutParams params = win.getAttributes();//获取LayoutParams
    params.x = -(SCREEN_WIDTH/8);//设置x坐标
    params.y = -tmpHeight;//设置y坐标
    params.width = tmpWidth;
    win.setAttributes(params);//设置生效
    bubbleAlert.setCancelable(false);
    bubbleAlert.setContentView(bubbleView);
    bubbleAlert.show();
  }
  /**
   * 获取屏幕尺寸
   */
  private void getDimension(){
    /** 获取屏幕的宽和高 */
    DisplayMetrics dm = new DisplayMetrics();
    getWindowManager().getDefaultDisplay().getMetrics(dm);
    SCREEN_WIDTH = dm.widthPixels;
    SCREEN_HEIGHT = dm.heightPixels;
  }
}