无法注册广播接收器

Question

我正在尝试使用广播接收器检测互联网连接我已经动态注册了广播接收器但是当应用程序启动时它显示以下错误：

 java.lang.IllegalArgumentException: Receiver not registered: com.app.qrius.ConnectivityReceiver@3240fd8

我想重定向到另一个在没有互联网连接时不显示网络消息的活动。

下面是我的代码：

连接接收器.java

public class ConnectivityReceiver extends BroadcastReceiver {

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

    ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(context.CONNECTIVITY_SERVICE);
    NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();

    if(networkInfo != null){

        Toast.makeText(context,"On",Toast.LENGTH_SHORT).show();
    }
    else{
         Intent i = new Intent(context,Network.class);
         context.startActivity(i);
        ((Activity)context).finish();
    }
}

MainActivity.java

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    final Toolbar toolbar = findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
  
  }

    @Override
protected void onResume() {

    LocalBroadcastManager.getInstance(this).registerReceiver(
            mMessageReceiver, new IntentFilter("android.net.conn.CONNECTIVITY_CHANGE"));
    super.onResume();
}

 private BroadcastReceiver mMessageReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        // TODO Auto-generated method stub
        // Get extra data included in the Intent
        ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(context.CONNECTIVITY_SERVICE);
        NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();

        if(networkInfo != null){

            Toast.makeText(context,"On",Toast.LENGTH_SHORT).show();
        }
        else{
            //  Toast.makeText(context,"Off",Toast.LENGTH_SHORT).show();
            Intent i = new Intent(context,Network.class);
            context.startActivity(i);
            ((Activity)context).finish();
        }
    }
};

}

有人请让我知道我做错了什么，任何帮助将不胜感激。

谢谢

Answer 1

您需要将其添加到 AndroidManifest.xml

如同：

        <receiver
        android:name=".BatteryPowerBroadcastReceiver"
        android:enabled="true"
        android:exported="true">
        <intent-filter>
            <action android:name="android.intent.action.ACTION_POWER_CONNECTED" />
            <action android:name="android.intent.action.ACTION_POWER_DISCONNECTED" />
            <action android:name="android.intent.action.BATTERY_LOW" />
            <action android:name="android.intent.action.BATTERY_OKAY" />
            <action android:name="android.intent.action.DOCK_EVENT" />
        </intent-filter>
    </receiver>

Answer 2

您应该如下更改您的活动，以便以编程方式register和unregister广播接收器。 您可以为此使用LocalBroadcastManager 。

    public class MainActivity extends AppCompatActivity {
   
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        final Toolbar toolbar = findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
      }
    
    
    @Override
    protected void onResume() {
        // Register to receive messages.
        // We are registering an observer (mMessageReceiver) to receive 
        //  Intents
        IntentFilter intentFilter = new IntentFilter();
        intentFilter.addAction("android.net.conn.CONNECTIVITY_CHANGE");

        LocalBroadcastManager.getInstance(this).registerReceiver(
                mMessageReceiver, intentFilter);
        super.onResume();
    }
    
    @Override
    protected void onPause() {
        // Unregister since the activity is paused.
        LocalBroadcastManager.getInstance(this).unregisterReceiver(
                mMessageReceiver);
        super.onPause();
    }


    // Our handler for received Intents. This will be called whenever an Intent
    // with an action named "custom-event-name" is broadcasted.
    private BroadcastReceiver mMessageReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            // TODO Auto-generated method stub
            // Get extra data included in the Intent
            
            ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(context.CONNECTIVITY_SERVICE);
    NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();

    if(networkInfo != null){

        Toast.makeText(context,"On",Toast.LENGTH_SHORT).show();
    }
    else{
         Intent i = new Intent(context,Network.class);
         context.startActivity(i);
        ((Activity)context).finish();
    }
        }

    };

}

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