View Interstitial by clicking the Toolbar home button

Question

I tried to implement the display of an interstitial banner on the home button of my activitys but it didn’t work properly.

I used

 @Override
 public boolean onOptionsItemSelected(MenuItem item) {
    int id = item.getItemId();

   if (id == R.id.home){

      if (interstitialAd.isLoaded()) {
          interstitialAd.show();
      }else{
          finish();
      }
   }
}

Only that way the banner does not appear in the click but only when closing the app.

What is the correct way to display the banner by clicking the home button?

QUESTION CORRECTED AND WORKING

Obs.: The configuration for the display of the home button I made directly in the manifest, not needing to set Toolbar in Activity itself, just include the code below to catch the action in Toolbar’s home button.

MANIFEST

    <activity
        android:name=".MinhaActivitySecundaria"
        android:screenOrientation="portrait"
        android:configChanges="orientation|keyboardHidden|screenSize"
        android:windowSoftInputMode="adjustResize"
        android:parentActivityName=".MainActivity">
        <meta-data
            android:name="android.support.PARENT_ACTIVITY"
            android:value=".MainActivity" />
    </activity>

INCLUDE THE CODE BELOW IN THE SECONDARY ACTIVITY

Remember to use the Appcompatactivity extension

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    int id = item.getItemId();

   if (id == android.R.id.home){

      if (interstitialAd.isLoaded()) {
          interstitialAd.show();
          finish();
      }else{
          finish();
      }
   }
   return true;
}

Answer 1

Henqsan,

You should use the id below which is the correct id for the Activity back button.

    if (id == android.R.id.home){
         doSomethink();
    }

Remembering that if you are using Toolbar has arrow-there.

    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    assert getSupportActionBar() != null;
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    getSupportActionBar().setDisplayShowHomeEnabled(true);