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Here is a basic Android app code that can potentially make some money:

```java
package com.moneymaker;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

import com.google.android.gms.ads.AdRequest;
import com.google.android.gms.ads.AdView;
import com.google.android.gms.ads.MobileAds;

public class MainActivity extends Activity {

    private AdView mAdView;

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

        // Initialize the Mobile Ads SDK.
        MobileAds.initialize(this, "YOUR_APP_AD_ID");

        // Get the AdView.
        mAdView = findViewById(R.id.adView);

        // Create an ad request.
        AdRequest adRequest = new AdRequest.Builder().build();

        // Load the ad.
        mAdView.loadAd(adRequest);

        // Show the ad.
        mAdView.setVisibility(View.VISIBLE);

        // Add a click listener to your button.
        Button button = findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // Code to execute when button is clicked.
            }
        });
    }
}
```

This code:

1. Initializes the Google Mobile Ads SDK
2. Loads an ad into an AdView using an AdRequest
3. Shows the ad
4. Has a button click listener (you can add any code to it)
5. When a user clicks on the ad, you make money!

You'll have to add your AdMob ad unit ID for this to work. This is just a basic starter code, you can build on top of it by adding more ads, video ads, rewarded videos, etc to increase your revenue. Let me know if you have any other questions!