public class myFloatView extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Button bb=new Button(getApplicationContext()); WindowManager wm=(WindowManager)getApplicationContext().getSystemService(\"window\"); WindowManager.LayoutParams wmParams = new WindowManager.LayoutParams(); wmParams.type=2002; //type是关键,这里的2002表示系统级窗口,你也可以试试2003。 wmParams.format=1; wmParams.flags=40; wmParams.width=40; wmParams.height=40; wm.addView(bb, wmParams); }}