ImageToBitmapConverter testing main method

package net.dermetfan.someLibgdxTests;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;

import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.Bitmap.CompressFormat;
import android.net.Uri;
import android.os.Bundle;

import com.badlogic.gdx.backends.android.AndroidApplication;
import com.badlogic.gdx.backends.android.AndroidApplicationConfiguration;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;
import com.badlogic.gdx.graphics.g2d.TextureRegion;
import com.badlogic.gdx.scenes.scene2d.ui.Image;
import com.badlogic.gdx.scenes.scene2d.utils.TextureRegionDrawable;

public class MainActivity extends AndroidApplication {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        AndroidApplicationConfiguration cfg = new AndroidApplicationConfiguration();
        cfg.useGL20 = true;

        SomeLibgdxTests slt = new SomeLibgdxTests();
        initialize(slt, cfg);

        SpriteBatch batch = new SpriteBatch();
        Bitmap bitmap = ImageToBitmapConverter.convert(new Image(new TextureRegionDrawable(new TextureRegion(new Texture(Assets.testImage)))), batch);
        batch.dispose();

        FileOutputStream fos = null;
        File file = new File("test.png");
        try {
            fos = new FileOutputStream(file);
        } catch(FileNotFoundException e) {
            e.printStackTrace();
        }

        bitmap.compress(CompressFormat.PNG, 100, fos);
        startActivity(new Intent(Intent.ACTION_VIEW).setData(Uri.fromFile(file)));
    }

    /* stack trace
    02-02 02:50:56.689: W/dalvikvm(7799): threadid=1: thread exiting with uncaught exception (group=0x2b542210)
02-02 02:50:56.718: E/AndroidRuntime(7799): FATAL EXCEPTION: main
02-02 02:50:56.718: E/AndroidRuntime(7799): java.lang.RuntimeException: Unable to start activity ComponentInfo{net.dermetfan.someLibgdxTests/net.dermetfan.someLibgdxTests.MainActivity}: java.lang.NullPointerException
02-02 02:50:56.718: E/AndroidRuntime(7799):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1967)
02-02 02:50:56.718: E/AndroidRuntime(7799):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1992)
02-02 02:50:56.718: E/AndroidRuntime(7799):     at android.app.ActivityThread.access$600(ActivityThread.java:127)
02-02 02:50:56.718: E/AndroidRuntime(7799):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1158)
02-02 02:50:56.718: E/AndroidRuntime(7799):     at android.os.Handler.dispatchMessage(Handler.java:99)
02-02 02:50:56.718: E/AndroidRuntime(7799):     at android.os.Looper.loop(Looper.java:137)
02-02 02:50:56.718: E/AndroidRuntime(7799):     at android.app.ActivityThread.main(ActivityThread.java:4441)
02-02 02:50:56.718: E/AndroidRuntime(7799):     at java.lang.reflect.Method.invokeNative(Native Method)
02-02 02:50:56.718: E/AndroidRuntime(7799):     at java.lang.reflect.Method.invoke(Method.java:511)
02-02 02:50:56.718: E/AndroidRuntime(7799):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
02-02 02:50:56.718: E/AndroidRuntime(7799):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
02-02 02:50:56.718: E/AndroidRuntime(7799):     at dalvik.system.NativeStart.main(Native Method)
02-02 02:50:56.718: E/AndroidRuntime(7799): Caused by: java.lang.NullPointerException
02-02 02:50:56.718: E/AndroidRuntime(7799):     at com.badlogic.gdx.graphics.GLTexture.createGLHandle(GLTexture.java:226)
02-02 02:50:56.718: E/AndroidRuntime(7799):     at com.badlogic.gdx.graphics.Texture.<init>(Texture.java:132)
02-02 02:50:56.718: E/AndroidRuntime(7799):     at com.badlogic.gdx.graphics.Texture.<init>(Texture.java:112)
02-02 02:50:56.718: E/AndroidRuntime(7799):     at com.badlogic.gdx.graphics.Texture.<init>(Texture.java:104)
02-02 02:50:56.718: E/AndroidRuntime(7799):     at com.badlogic.gdx.graphics.Texture.<init>(Texture.java:100)
02-02 02:50:56.718: E/AndroidRuntime(7799):     at net.dermetfan.someLibgdxTests.MainActivity.onCreate(MainActivity.java:34)
02-02 02:50:56.718: E/AndroidRuntime(7799):     at android.app.Activity.performCreate(Activity.java:4465)
02-02 02:50:56.718: E/AndroidRuntime(7799):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
02-02 02:50:56.718: E/AndroidRuntime(7799):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1931)
02-02 02:50:56.718: E/AndroidRuntime(7799):     ... 11 more
    */

}