java - 检查服务是否正在从广播接收器内运行

Question

我知道这和我的问题类似。 https://stackoverflow.com/a/22511290/2208342但我读到，随着 Android 删除该代码，该问题的解决方案将变得过时。

以下引用摘自https://stackoverflow.com/a/5921190/2208342

I'd discourage the use of this solution. For Android L they're removing ActivityManager.getRecentTasks() and it had the same note in the documentation. So be warned!

我还听说这个解决方案不适用于 android kitkat。

BroadCastReceiver 类

public class IncomingSms extends BroadcastReceiver {

final SmsManager sms = SmsManager.getDefault();


public IncomingSms(){}


@Override
public void onReceive(Context context, Intent intent) {

    final Bundle bundle = intent.getExtras();

    Intent intent1 = new Intent(context, CallDetectService.class);



    if (context.stopService(intent1)) {
        Toast.makeText(context,"if context",Toast.LENGTH_LONG).show();
        try {


            if (bundle != null) {

                final Object[] pdusObj = (Object[]) bundle.get("pdus");

                for (int i = 0; i < pdusObj.length; i++) {

                    SmsMessage currentMessage = SmsMessage.createFromPdu((byte[]) pdusObj[i]);
                    String phoneNumber = currentMessage.getDisplayOriginatingAddress();

                    String senderNum = phoneNumber;
                    String message = currentMessage.getDisplayMessageBody();


                    String sms = "TEST";
                    try {
                        SmsManager smsManager = SmsManager.getDefault();
                        smsManager.sendTextMessage(senderNum, null, sms, null, null);

                        Toast.makeText(context, "Sms sent Succesfully", Toast.LENGTH_LONG).show();

                    } catch (Exception e) {
                        e.printStackTrace();
                        Toast.makeText(context, "Sms Failed", Toast.LENGTH_LONG).show();
                    }


                    Log.i("SmsReciver", "senderNum: " + senderNum + "; message: " + message);

                    // Show Alert
                    int duration = Toast.LENGTH_LONG;
                    Toast toast = Toast.makeText(context, "senderNum: " + senderNum + ", message: " + message, duration);
                    toast.show();

                } // End For loop
            } // bundle is null

        } catch (Exception e) {
            Log.e("SmsReciever", "Exeption smsReceiver" + e);
        }
    }
    else{
        Toast.makeText(context,"else context",Toast.LENGTH_LONG).show();
    }

}
}

服务等级

public class CallDetectService extends Service {


private CallHelper callHelper;

public CallDetectService() {
}


@Override
public int onStartCommand(Intent intent, int flags, int startId){
    callHelper = new CallHelper(this);


    int res = super.onStartCommand(intent, flags, startId);
    callHelper.start();
    Toast.makeText(getApplicationContext(), "Starting Service", Toast.LENGTH_LONG).show();

    return res;
    }

@Override
public void onDestroy(){
    super.onDestroy();


    callHelper.stop();
    //Toast.makeText(getApplicationContext(),"Stop Service",Toast.LENGTH_LONG).show();


}

@Override
public IBinder onBind (Intent intent) {
        return  null;
}
}

在我的 MainActivity 中，我有这段代码，这正是我在广播接收器中想要的代码。

Intent intent = new Intent(this,CallDetectService.class);

    if (stopService(intent)){

Answer 1

有一个解决方法，但仅如果您在 Activity 中使用接收器:

• 将接收器类添加为 Activity 中的内部类

  public final class MyActivity extends Activity {
      public final class IncomingSms extends BroadcastReceiver {
         ...
  }
  

• 在 Activity 中动态注册/取消注册接收器onStart()/onStop()
• 每当您绑定(bind)到此服务时，让您的 Activity 获取您的服务的引用
• 在您的接收器onReceive()中使用引用

注意

请记住，上述实现存在一些缺陷:

• 内部类可以显式访问任何外部类成员变量(字段和方法)
• 这会导致潜在的内存泄漏，尤其是当您的服务在单独的线程中执行某些操作时
• 当 Activity 存在时，您的接收器处于 Activity 状态