[FIXED] moving the code to the activity java class (making two java classes into one)

Issue

I have codes in two classes

First class is ExampleBroadcastReceiver:

public class ExampleBroadcastReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        if (ConnectivityManager.CONNECTIVITY_ACTION.equals(intent.getAction())) {
            boolean noConnectivity = intent.getBooleanExtra(
                    ConnectivityManager.EXTRA_NO_CONNECTIVITY, false
            );
            if (noConnectivity) {
                Toast.makeText(context, "Disconnected", Toast.LENGTH_SHORT).show();
            } else {
                Toast.makeText(context, "Connected", Toast.LENGTH_SHORT).show();
            }
        }
    }
}

Second class is MainActivity:

public class MainActivity extends AppCompatActivity {
    ExampleBroadcastReceiver exampleBroadcastReceiver = new ExampleBroadcastReceiver();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    @Override
    protected void onStart() {
        super.onStart();
        IntentFilter filter = new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION);
        registerReceiver(exampleBroadcastReceiver, filter);
    }

    @Override
    protected void onStop() {
        super.onStop();
        unregisterReceiver(exampleBroadcastReceiver);
    }
}

How can I make the two classes into one by passing the code from the ExampleBroadcastReceiver class to MainActivity? Is it possible? Please don't ask why. Thanks.

Solution

Use java interface to handle an event in MainActivity that occurs in ExampleBroadcastReceiver. This way you don't have to merge classes to share an event based data.

public class ExampleBroadcastReceiver extends BroadcastReceiver {

    public interface ConnectivityMonitorCallback {
        void onConnectivityChanged(boolean connectivity);
    }

    public ConnectivityMonitorCallback callback;

    public ExampleBroadcastReceiver(@NonNull ConnectivityMonitorCallback eventCallback) {
        callback = eventCallback;
    }

    @Override
    public void onReceive(Context context, Intent intent) {
        if (ConnectivityManager.CONNECTIVITY_ACTION.equals(intent.getAction())) {
            boolean noConnectivity = intent.getBooleanExtra(
                    ConnectivityManager.EXTRA_NO_CONNECTIVITY, false
            );
            callback.onConnectivityChanged(noConnectivity);
        }
    }
}

Finally in the MainActivity you handle the event.

public class MainActivity extends AppCompatActivity {
    ExampleBroadcastReceiver exampleBroadcastReceiver;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Define event handling code here which occurs in ExampleBroadcastReceiver
        exampleBroadcastReceiver = new ExampleBroadcastReceiver(new ExampleBroadcastReceiver.ConnectivityMonitorCallback {
            @Override
            void onConnectivityChanged(boolean connectivity) {
                // Handle the event that occured in ExampleBroadcastReceiver
            }
        });
    }

    @Override
    protected void onStart() {
        super.onStart();
        IntentFilter filter = new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION);
        registerReceiver(exampleBroadcastReceiver, filter);
    }

    @Override
    protected void onStop() {
        super.onStop();
        unregisterReceiver(exampleBroadcastReceiver);
    }
}

Answered By - Kozmotronik
Answer Checked By - Mildred Charles (JavaFixing Admin)