Amending the code to use the full screen and the best Android class

Find the following line of code near the top of the BulletHellActivity.java file:

import androidx.appcompat.app.AppCompatActivity;

Change the preceding line of code to this:

import android.app.Activity;

Immediately after the preceding line of code, add this new line of code:

import android.view.Window;

The line of code we changed enables us to use a more efficient version of the Android API, Activity instead of AppCompatActivity, and the new line of code allows us to use the Window class, which we will do in a moment.

At this point, there are errors in our code. This next step will remove the errors. Find the following line of code in the BulletHellActivity.java file:

public class BulletHellActivity extends AppCompatActivity {

Change the preceding line of code to the same as this next line of code:

public class BulletHellActivity extends Activity {

All the errors are gone at this point...