4K Wallpaper App with Live Wallpaper and No Backend, Admob Ads

Introduction

In this tutorial, we will be discussing how to use the 4K Wallpaper App with Live Wallpaper and No Backend, Admob Ads. The 4K Wallpaper App is a popular mobile app that allows users to set high-quality wallpapers on their devices. In this tutorial, we will go through the steps to develop a 4K Wallpaper App with live wallpapers and Admob ads without a backend. This app will allow users to set live wallpapers, browse and download high-quality wallpapers, and view advertisements.

Step 1: Setting up the Project Structure

To start, let's set up the project structure. Create a new Android Studio project and select "Empty Activity" as the template. Name your project "4KWallpaperApp".

Step 2: Adding Admob Ads

To add Admob ads to our app, we need to add the Admob library to our project. To do this, follow these steps:

• Open your project's build.gradle file and add the following code:

  dependencies {
  implementation 'com.google.android.gms:play-services-ads:20.4.0'
  }

• Sync your project by clicking on the "Sync Now" button in the top right corner of the Android Studio window.

• Create a new Java file called "AdmobAdapter.java" and add the following code:

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

public class AdmobAdapter { public static void loadAd(Activity activity, AdView adView) { AdRequest adRequest = new AdRequest.Builder().build(); adView.loadAd(adRequest); } }

This code defines a class called "AdmobAdapter" that has a method to load Admob ads. The method takes an activity and an AdView object as parameters.

**Step 3: Creating the Live Wallpaper**

To create the live wallpaper, we need to create a new Java file called "LiveWallpaper.java" and add the following code:

import android.service.wallpaper.WallpaperService; import android.service.wallpaper.WallpaperService.Engine;

public class LiveWallpaper extends WallpaperService { @Override public Engine onCreateEngine() { return new WallpaperEngine(); }

private class WallpaperEngine extends Engine {
    private float xOffSet = 0;
    private float yOffSet = 0;

    @Override
    public void onCreate(SurfaceHolder surfaceHolder) {
        super.onCreate(surfaceHolder);
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
    }

    @Override
    public void onOffsetsChanged(float x, float y, float z, float w, int cx, int cy) {
        xOffSet = x;
        yOffSet = y;
    }

    @Override
    public void onSurfaceChanged(SurfaceHolder surfaceHolder, int format, int width, int height) {
        super.onSurfaceChanged(surfaceHolder, format, width, height);
    }

    @Override
    public void onSurfaceCreated(SurfaceHolder surfaceHolder) {
        super.onSurfaceCreated(surfaceHolder);
    }
}

}

This code defines a class called "LiveWallpaper" that extends the "WallpaperService" class. The "onCreateEngine" method returns an instance of the "WallpaperEngine" class, which is responsible for drawing the live wallpaper.

**Step 4: Creating the Wallpaper Drawer**

To create the wallpaper drawer, we need to create a new Java file called "WallpaperDrawer.java" and add the following code:

import android.content.Context; import android.graphics.Bitmap; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.Path; import android.graphics.PorterDuff; import android.graphics.PorterDuffXfermode; import android.graphics.Rect; import android.graphics.RectF; import android.graphics.drawable.BitmapDrawable; import android.view.View;

public class WallpaperDrawer extends View { private Paint paint; private Bitmap bitmap; private float xOffSet; private float yOffSet;

public WallpaperDrawer(Context context) {
    super(context);
    paint = new Paint();
    paint.setColor(Color.parseColor("#ffffff"));
    paint.setAlpha(128);
    paint.setAntiAlias(true);
}

@Override
protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    if (bitmap!= null) {
        canvas.drawBitmap(bitmap, xOffSet, yOffSet, null);
    }
}

public void setBitmap(Bitmap bitmap) {
    this.bitmap = bitmap;
    invalidate();
}

public void setXOffSet(float xOffSet) {
    this.xOffSet = xOffSet;
    invalidate();
}

public void setYOffSet(float yOffSet) {
    this.yOffSet = yOffSet;
    invalidate();
}

}

This code defines a class called "WallpaperDrawer" that extends the "View" class. The class has a "setBitmap" method to set the wallpaper image, and "setXOffSet" and "setYOffSet" methods to set the x and y offsets of the wallpaper.

**Step 5: Adding the Wallpaper Drawer to the Live Wallpaper**

To add the wallpaper drawer to the live wallpaper, we need to modify the "LiveWallpaper" class as follows:

public class LiveWallpaper extends WallpaperService { //...

@Override
public void onCreateEngine() {
    return new WallpaperEngine();
}

private class WallpaperEngine extends Engine {
    //...

    private WallpaperDrawer wallpaperDrawer;

    @Override
    public void onCreate(SurfaceHolder surfaceHolder) {
        super.onCreate(surfaceHolder);
        wallpaperDrawer = new WallpaperDrawer(getContext());
    }

    @Override
    public void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        wallpaperDrawer.setBitmap(bitmap);
        wallpaperDrawer.setXOffSet(xOffSet);
        wallpaperDrawer.setYOffSet(yOffSet);
        wallpaperDrawer.draw(canvas);
    }
}

}

In this code, we create an instance of the "WallpaperDrawer" class in the "onCreate" method of the "WallpaperEngine" class, and set the wallpaper image and offsets in the "onDraw" method.

**Step 6: Adding Admob Ads to the Live Wallpaper**

To add Admob ads to the live wallpaper, we need to modify the "WallpaperEngine" class as follows:

public class LiveWallpaper extends WallpaperService { //...

private class WallpaperEngine extends Engine {
    //...

    private AdView adView;

    @Override
    public void onCreate(SurfaceHolder surfaceHolder) {
        super.onCreate(surfaceHolder);
        adView = new AdView(getContext());
        adView.setAdSize(AdSize.SMART_BANNER);
        adView.setAdUnitId("YOUR_ADMOB_AD_UNIT_ID");
    }

    @Override
    public void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        // Draw the ad
        canvas.drawBitmap(adView.getBitmap(), 0, 0, null);
    }

    @Override
    public void onPause() {
        super.onPause();
        adView.pause();
    }

    @Override
    public void onResume() {
        super.onResume();
        adView.resume();
    }
}

}

In this code, we create an instance of the "AdView" class and set the ad size and ad unit ID in the "onCreate" method of the "WallpaperEngine" class. We then draw the ad in the "onDraw" method of the "WallpaperEngine" class. We also pause and resume the ad in the "onPause" and "onResume" methods, respectively.

**Step 7: Adding the Admob Ads to the App**

To add the Admob ads to the app, we need to modify the "AndroidManifest.xml" file as follows:

In this code, we add the "MainActivity" activity to the manifest file, which will launch the app when the user clicks on the app icon. We also add the "AdActivity" receiver to the manifest file, which will handle Admob ad requests. We also add the "LiveWallpaper" service to the manifest file, which will be responsible for displaying the live wallpaper.

That's it! With these steps, you should have a working 4K Wallpaper App with live wallpaper and Admob ads.