To change from AdMob to StartApp ads in your Android project, you'll need to replace the AdMob-related code with StartApp's SDK and ad integration. Below are the steps to achieve this:
1. Remove AdMob Dependencies
Remove the AdMob dependencies from your build.gradle file. These lines typically look like this:

gradle

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implementation 'com.google.android.gms:play-services-ads:20.6.0'

2. Add StartApp Dependencies
Add the StartApp SDK dependency to your build.gradle file:

gradle

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implementation 'com.startapp:inapp-sdk:4.10.+'

3. Initialize StartApp SDK
In your MainActivity.java, initialize the StartApp SDK in the onCreate method:

java

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import com.startapp.sdk.adsbase.StartAppSDK;

Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

// Initialize StartApp SDK
StartAppSDK