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Can I run an Activity before running libgdx?
public class MyActivity extends AndroidApplication {
    public void onCreate (android.os.Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setRequestedOrientation (ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);

        Intent myIntent = new Intent(MyActivity.this, StartActivity.class);
        startActivity(myIntent);

        initialize(new MyGame(), false); //run libgdx
    }
}

public class StartActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        TextView text = new TextView(this);
        text.setText("Hello World, Android");
        setContentView(text);

        try {
            Thread.sleep(7000);
        }
        catch (InterruptedException e) {};
        finish();
        return;
    }
}

Intent i = new Intent(this, MyActivity.class);
startActivity(i);

public class BluetoothActivity extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.bluetoothsettings);
        Button startGame = (Button)findViewById(R.id.btnStartGame);

        // handle set start click
        startGame.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(BluetoothActivity.this, GameActivity.class);
                BluetoothActivity.this.startActivity(intent);
            }
        });
    }
}

<activity android:name=".BluetoothActivity">
  <intent-filter>
    <action android:name="android.intent.action.MAIN" />
    <category android:name="android.intent.category.LAUNCHER" />
  </intent-filter>
</activity>