Update a counter within the NavigationView (side menu) on Android

Question

Update a counter within the NavigationView (side menu) on Android

I have a NavigationView with an element where there is a counter to its right, to indicate how many elements there are to see.

In customize NavigationView menu layout I have followed the steps to add a counter more or less like the following image

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/my_counter"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:gravity="center_vertical"
    android:text="0"
    android:textAppearance="@style/TextAppearance.AppCompat.Body2" />

To modify its content I use setText

TextView myCounter = (TextView) this.findViewById(R.id.my_counter);
if (myCounter != null) {
    myCounter.setText("99+");
}

If I put it inside a onClick event of a button, the value from 0 to 99+

But I can't get to modify it when the app starts, I've tested it on onCreate() y onStart()

I've searched for SO and some solutions is to use a runnable, but I don't think it's the most appropriate thing to expect the menu to be fully loaded to modify the counter value.

0

Author: Comunidad, 2016-06-07

Source

1 answers

score 1 · Accepted Answer

To change the counter value dynamically when the activity is launched, it must be done in the event where menu items are prepared, onPrepareOptionsMenu

@SuppressLint("SetTextI18n")
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
    TextView myCounter = (TextView) this.findViewById(R.id.my_counter);
    if (myCounter != null) {
        myCounter.setText("99+");
    }
    return super.onPrepareOptionsMenu(menu);
}