拦截 常按HOME键 但是会闪现一下任务管理器

public void onWindowFocusChanged(boolean hasFocus) {
    super.onWindowFocusChanged(hasFocus);
 
        Log.d("Focus debug", "Focus changed !");
 
    if(!hasFocus) {
        Log.d("Focus debug", "Lost focus !");
 
        Intent closeDialog = new Intent(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);
        closeDialog.putExtra("reason", "globalactions");//可避免关机对话框被关闭
        sendBroadcast(closeDialog);
    }
}