Java Android仅在手机锁定或应用程序处于后台时才激活广播接收器

我有一个聊天应用程序，我希望我的GCM广播仅在手机屏幕锁定或应用程序未激活时激活（主页按钮，而不是应用程序关闭！）

我尝试了以下方法：

boolean receiver_working = false;

public void enableBroadcastReceiver(){
    IntentFilter filter = new IntentFilter();
    filter.addAction("com.google.android.c2dm.intent.RECEIVE");
    filter.addAction("com.google.android.c2dm.intent.REGISTRATION");
    filter.addCategory("com.flipflopdev.epvp_aj1987_chat");
    registerReceiver(new GcmBroadcastReceiver(), filter);
    Toast.makeText(getApplicationContext(), "Enabled broadcast receiver", Toast.LENGTH_SHORT).show();
    receiver_working = true;
   }

public void disableBroadcastReceiver(){
    ComponentName receiver = new ComponentName(getApplicationContext(), GcmBroadcastReceiver.class);
    PackageManager pm = getApplicationContext().getPackageManager();

    pm.setComponentEnabledSetting(receiver,
            PackageManager.COMPONENT_ENABLED_STATE_DISABLED,
            PackageManager.DONT_KILL_APP);
    Toast.makeText(getApplicationContext(), "Disabled broadcst receiver", Toast.LENGTH_SHORT).show();
    receiver_working = false;
   }

@Override
public void onDestroy() {
    super.onDestroy();
    if(receiver_working) {
        disableBroadcastReceiver();
    }
}

@Override
public void onPause() {
    super.onPause();
    if(!receiver_working) {
        enableBroadcastReceiver();
    }
}
    @Override
public void onResume() {
    super.onResume();
    checkPlayServices();
    if(receiver_working) {
        disableBroadcastReceiver();
    }
}

问题是onResume（）在活动刚开始时就启动，这就是为什么我有布尔变量。当我现在通过home按钮离开应用程序时，GCM通知会像应该的那样发出（因为BR已激活），当我回到应用程序时，会显示BR已停用，但如果发送，通知仍会发出

我的错在哪里