当应用程序被杀死时使广播接收器处于活动状态答案

【问题标题】：Make Broadcast Receiver Alive when app is killed当应用程序被杀死时使广播接收器处于活动状态
【发布时间】：2020-08-24 08:53:25
【问题描述】：

我创建了广播接收器来检测来电。当应用程序处于前台时它工作正常，但在杀死应用程序后它停止工作。所以我使用 Work Manager 来实现，但它也不起作用。我不确定我是否正确实施了工作管理器。

请帮助我在应用程序被杀死时让广播接收器活着，如果我在获得结果时犯了任何错误，也建议我正确的方法。

PhoneStateBroadcastReceiver.java

public class PhoneStateBroadcastReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
    TelephonyManager telephonyManager = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
    telephonyManager.listen(new PhoneStateListener() {
        @Override
        public void onCallStateChanged(int state, String phoneNumber) {
            super.onCallStateChanged(state, phoneNumber);
            try {
                if (state == TelephonyManager.CALL_STATE_RINGING) {
                    Log.e("phoneNumber", phoneNumber);
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
     }, PhoneStateListener.LISTEN_CALL_STATE);
   }
 }

PhoneStateWorkManager.java

public class PhoneStateWorkManager extends Worker {
PhoneStateBroadcastReceiver phoneStateBroadcastReceiver;

public PhoneStateWorkManager(@NonNull Context context, @NonNull WorkerParameters workerParams) {
    super(context, workerParams);
}

@NonNull
@Override
public Result doWork() {
    if (phoneStateBroadcastReceiver == null) {
        phoneStateBroadcastReceiver = new PhoneStateBroadcastReceiver();
    }
    IntentFilter filter = new IntentFilter(TelephonyManager.ACTION_PHONE_STATE_CHANGED);
    getApplicationContext().registerReceiver(phoneStateBroadcastReceiver, filter);
    return Result.success();
  }
}

MainActivity.java

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    addAutoStartup();
    Constraints constraints = new Constraints
            .Builder()
            .setRequiredNetworkType(NetworkType.NOT_REQUIRED)
            .build();
    WorkRequest phoneStateRequest = new OneTimeWorkRequest
            .Builder(PhoneStateWorkManager.class)
            .setConstraints(constraints)
            .build();
    WorkManager.getInstance(MainActivity.this).enqueue(phoneStateRequest);
}

private void addAutoStartup() {
    try {
        Intent intent = new Intent();
        String manufacturer = android.os.Build.MANUFACTURER;
        if ("xiaomi".equalsIgnoreCase(manufacturer)) {
            intent.setComponent(new ComponentName("com.miui.securitycenter", "com.miui.permcenter.autostart.AutoStartManagementActivity"));
        } else if ("oppo".equalsIgnoreCase(manufacturer)) {
            intent.setComponent(new ComponentName("com.coloros.safecenter", "com.coloros.safecenter.permission.startup.StartupAppListActivity"));
        } else if ("vivo".equalsIgnoreCase(manufacturer)) {
            intent.setComponent(new ComponentName("com.vivo.permissionmanager", "com.vivo.permissionmanager.activity.BgStartUpManagerActivity"));
        } else if ("Letv".equalsIgnoreCase(manufacturer)) {
            intent.setComponent(new ComponentName("com.letv.android.letvsafe", "com.letv.android.letvsafe.AutobootManageActivity"));
        } else if ("Honor".equalsIgnoreCase(manufacturer)) {
            intent.setComponent(new ComponentName("com.huawei.systemmanager", "com.huawei.systemmanager.optimize.process.ProtectActivity"));
        }

        List<ResolveInfo> list = getPackageManager().queryIntentActivities(intent, PackageManager.MATCH_DEFAULT_ONLY);
        if (list.size() > 0) {
            startActivity(intent);
        }
    } catch (Exception e) {
        Log.e("exc", String.valueOf(e));
    }
   }
 }

【问题讨论】：

您找到解决方案了吗？当应用程序从后台删除时，我的广播接收器不工作？有什么解决办法吗？

标签： android broadcastreceiver background-process android-workmanager telephonymanager

【解决方案1】：

当手机状态改变时，有两种方法可以得到回调：PhoneStateListener 和一个监听android.intent.action.PHONE_STATE 的BroadcastReceiver。

我建议完全不要使用PhoneStateListener，而只使用BroadcastReceiver 方法，可以通过AndroidManifest 进行设置，这样即使应用程序当前未处于活动状态也可以调用它。

查看本教程：https://medium.com/@saishaddai/how-to-know-when-a-device-is-ringing-in-android-57e516d0ab42

请注意，当一个应用被用户通过“FORCE CLOSE”杀死时，该应用的所有广播接收器都会立即暂停，并且系统会阻止它们接收未来的广播，直到用户手动重新打开该应用。

see here

因此，只要用户不强制关闭您的应用，您就应该能够收到手机状态更改。

【讨论】：