Android弹出窗口实现方法

/**
* 弹窗--新手指引
* @param cxt 
* @param id 资源编号
* @create_time 2011-7-27 下午05:12:49
*/
public static void displayWindow(Context cxt, int id) {
    final TextView imgTV = new TextView(cxt.getApplicationContext());
    imgTV.setBackgroundDrawable(cxt.getResources().getDrawable(id));//设置背景
    final WindowManager wm = (WindowManager) cxt.getApplicationContext().getSystemService("window");
    WindowManager.LayoutParams wmParams = new WindowManager.LayoutParams();
    wmParams.type = 2002;
    wmParams.format = 1;
    wmParams.flags = 40;
    wmParams.width = LayoutParams.FILL_PARENT;
    wmParams.height = LayoutParams.FILL_PARENT;
    wm.addView(imgTV, wmParams);
    imgTV.setOnClickListener(new Button.OnClickListener() {
      @Override
      public void onClick(View v) {
        wm.removeView(imgTV);//点击，将该窗口消失掉
      }
    });
}