Display Snackbar when message is received

app/src/main/java/ch/luria/mq1/MainActivity.java

@@ -12,6 +12,8 @@ import android.util.Log;
 import android.view.View;
 import android.widget.ToggleButton;
 
+import com.google.android.material.snackbar.Snackbar;
+
 import androidx.appcompat.app.AppCompatActivity;
 
 public class MainActivity extends AppCompatActivity {
@@ -22,6 +24,9 @@ public class MainActivity extends AppCompatActivity {
         public void onReceive(Context context, Intent intent) {
             String msg = intent.getStringExtra("STATE");
             Log.i(TAG, "Received " + msg);
+            View contextView = findViewById(R.id.toggleButton);
+            Snackbar.make(contextView, "Received " + msg, Snackbar.LENGTH_LONG)
+                .show();
             stateButton.setChecked(!msg.equals("OFF"));
         }
     };