使用广播退出打开了多个activity的程序

protected Myrecive myrecive;
    private class Myrecive extends BroadcastReceiver{

        @Override
        public void onReceive(Context context, Intent intent) {
            Log.v("sk",getLocalClassName());
            finish();
        }
    }
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main_activity4);
        myrecive = new Myrecive();
        IntentFilter _filter = new IntentFilter();
        _filter.addAction("com.xl.u323");
        registerReceiver(myrecive,_filter);
    }

    public void onClick(View v) {
                Intent _intent = new Intent();
                _intent.setAction("com.xl.u323");
                sendBroadcast(_intent);
}