Inflate a warning in the view from a Broadcastreceiver

Question

I have an application where it is necessary to monitor, and warn the user when he is not available with the internet. To solve this, I created a Broadcastreceiver and show a Toast when this situation happens. But I need to update this class so that, instead of showing a Textview, a Textview is on the screen informing the user that it is not connected. My idea is to put a layout with this Textview, on the current layout on the user screen until a connection is available, but the problem is that I can’t get this view to be displayed on any screen that the user is.

My Bradcast code is like this at the moment:

public class Connectivity extends BroadcastReceiver {

Util util = new Util();
private ViewGroup mLinearLayout;

@Override
public void onReceive(Context context, Intent intent) {
    if (!checkInternet(context)) {
        util.showToast(context, "Sem conexão disponível com a internet.", 1);
    }
}

boolean checkInternet(Context context) {
    ServiceManager serviceManager = new ServiceManager(context);
    if (serviceManager.isNetworkAvailable()) {
        return true;
    } else {
        return false;
    }
}

}

And the layout I’m trying to inflate, it’s like this:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="wrap_content">

<TextView
    android:layout_width="match_parent"
    android:layout_height="50dp"
    android:text="Sem conexão com internet disponível."
    android:id="@+id/message"
    android:layout_gravity="center_horizontal"
    android:background="#e01b18"
    android:gravity="center"
    android:textColor="#FFF"
    android:textSize="16dp" />
</RelativeLayout>

How can I, from a class, show this warning regardless of which screen it is on?

In the end I need you to stay like this:

Answer 1

It wasn’t the way I expected, but this was the best way I could do it. I used this post as a basis: https://stackoverflow.com/questions/8766739/show-an-alert-dialog-in-broadcast-receiver-after-a-system-reboot

I registered a Broadcastreceiver inside my Activity:

IntentFilter filter = new IntentFilter("android.net.conn.CONNECTIVITY_CHANGE");
this.registerReceiver(Receiver, filter);

And I created the method that will be responsible for making changes to the view as the connection changes happen:

private final BroadcastReceiver Receiver = new BroadcastReceiver() {

    @Override
    public void onReceive(Context context, Intent intent) {
        if(!util.verificaConexao(context))
            msgPopUp.setVisibility(View.VISIBLE);
        else
            msgPopUp.setVisibility(View.INVISIBLE);
    }
};

So the receiver works as it should and the messages in the view too.

If you want to make it more organized, as is my case, you can create a class. With the code below I created a class that would be responsible for registering the broadcast and making the changes in the view

public class Broadcasts {
private TextView msgPopUp;
Util util = new Util();
View rootView;

public void registerBroadcastConnectivity(Context context, RelativeLayout mainLayout){
    IntentFilter filter = new IntentFilter("android.net.conn.CONNECTIVITY_CHANGE");
    context.registerReceiver(Receiver, filter);

    rootView = ((Activity)context).getWindow().getDecorView().findViewById(android.R.id.content);

    LayoutInflater inflater =
            (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    View menuLayout = inflater.inflate(R.layout.notificacao_internet, mainLayout, true);
}

private final BroadcastReceiver Receiver = new BroadcastReceiver() {

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

        if(msgPopUp == null)
            msgPopUp = (TextView)rootView.findViewById(R.id.popUpConexao);

        if(!util.verificaConexao(context)) {
            msgPopUp.setVisibility(View.VISIBLE);
        }else {
            msgPopUp.setVisibility(View.INVISIBLE);
        }
    }
};

}

And below is the instance of the object, and the call to record the broadcast by passing the context and layout of Activity

 Broadcasts broadcast = new Broadcasts();
    broadcast.registerBroadcastConnectivity(this, (RelativeLayout)findViewById(R.id.opcaoMesaLayout));

With the class I find more elegant and organized.