android - 如何从应用程序类中注销广播接收器？

Question

我在 Android 的应用程序类中注册了广播接收器，但现在我的问题是在哪里取消注册该广播？

public class MyApplication extends Application 

{

@Override
public void onCreate() {
     ..... 
     // OTHER INITIALIZATIONS
     initNetworkBR();
} 
private void initNetworkBR() {

      br = new BroadcastReceiver() {
        ....
      };
      IntentFilter filter = new IntentFilter();
      filter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);
      registerReceiver(br, filter);
   }
}

Answer 1

一个建议是在您的启动器活动或所需的活动中取消注册，如下所示：

@Override
protected void onDestroy() {
    super.onDestroy();
    ((MyApplication) getApplication()).unregisterReceiver();
}

并在类中实现unregisterReceiver方法MyApplication：

public void unregisterReceiver() {
     unregisterReceiver(br);//your broadcast
}

Answer 2

除了在应用程序类中使用广播接收器外，您可以为所有活动使用基类。并在 Base Activity 中注册 BR，然后向孩子提供回调。由于 Activity 具有严格的生命周期模型，因此最好在 Activity 中使用 Runtime Broadcast 接收器而不是 Application 类。

 public class BaseActivity extends AppCompatActivity {
    @Override
    protected void onResume() {
        super.onResume();
        //registerReceiver Here
    }

    @Override
    protected void onPause() {
        super.onPause();
        //unregisterReceiver here
    }
}

Answer 3

您应该在 onPause() 中使用 unregisterReceiver(BroadcastReceiver receiver) 来取消注册广播接收器。

例子：

public class MyActivity extends Activity {
  private final BroadcastReceiver mybroadcast = new SmsBR();

  public void onResume() {
    super.onResume();

    IntentFilter filter = new IntentFilter();
    filter.addAction("android.provider.Telephony.SMS_RECEIVED");
    registerReceiver(mybroadcast, filter);
  }

  public void onPause() {
    super.onPause();

    unregisterReceiver(mybroadcast);
  }
}

Answer 4

我认为您应该使用LocalBroadcastManager注册和注销接收器而不是BroadcastReceiver.

使用 LocalBroadcastManager 的好处

@Override
public void onCreate(Bundle savedInstanceState) {

  LocalBroadcastManager.getInstance(this).registerReceiver(mMessageReceiver,
      new IntentFilter("custom-event-name"));
}

@Override
protected void onDestroy() {
  // Unregister since the activity is about to be closed.
  LocalBroadcastManager.getInstance(this).unregisterReceiver(mMessageReceiver);
  super.onDestroy();
}

Answer 5

尝试使用以下代码：
如果您已从 Manifiest.xml 注册

ComponentName component = new ComponentName(context, MyReceiver.class);

    int status = context.getPackageManager().getComponentEnabledSetting(component);
    if(status == PackageManager.COMPONENT_ENABLED_STATE_ENABLED) {
     context.getPackageManager().setComponentEnabledSetting(component, PackageManager.COMPONENT_ENABLED_STATE_DISABLED , PackageManager.DONT_KILL_APP);
    }

如果以编程方式注册接收者：

@Override
public void onCreate(Bundle savedInstanceState) {

  LocalBroadcastManager.getInstance(this).registerReceiver(mMessageReceiver,
      new IntentFilter("custom-event-name"));
}

@Override
protected void onDestroy() {
  // Unregister since the activity is about to be closed.
  LocalBroadcastManager.getInstance(this).unregisterReceiver(mMessageReceiver);
  super.onDestroy();
}