My first simple mobile app. --- 3D image change

======================================== Activity.java file ======================================== package com.eg.try_animation;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle; import android.view.View; import android.widget.ImageView;

public class MainActivity extends AppCompatActivity {

ImageView a1,a2;
boolean flag = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_main);
    a1 = (ImageView)findViewById(R.id.imga);
    a2 = (ImageView)findViewById(R.id.imgb);


}
public void fade1(View v){

// a1.animate().alpha(0).setDuration(1000); a1.animate().scaleX(.5f).scaleY(.5f).setDuration(1000); if(!flag){ flag = true; a1.animate().scaleX(1).scaleY(1).setDuration(1000); a1.animate().translationX(-1000).setDuration(1000);

     }
    else{
        flag = false;
        a1.animate().scaleX(.5f).scaleY(.5f).setDuration(1000);
        a1.animate().translationX(0).setDuration(1000);

     }
}
public void fade(View v){
    if(!flag){
    a1.animate().alpha(0).scaleX(.5f).scaleY(.5f).setDuration(1000);
    a2.animate().alpha(1).scaleX(1).scaleY(1).setDuration(1000);
    flag = true;
    }
    else{
    a2.animate().alpha(0).scaleX(.5f).scaleY(.5f).setDuration(1000);
    a1.animate().alpha(1).scaleX(1).scaleY(1).setDuration(1000);
        flag = false;

    }
}

}

================================== .xml file ==============================