public class MainActivity extends AppCompatActivity{

private ImageView rea;
private int time=3;
private Handler handler=new Handler(){
    @Override
    public void handleMessage(Message msg) {
        super.handleMessage(msg);
        if (msg.what==0){
            if (time>0){
                time--;
                text_time.setText(time+"s");
                handler.sendEmptyMessageDelayed(0,1000);
            }else {
                Intent intent = new Intent(MainActivity.this, SecondActivity.class);
                startActivity(intent);
                finish();
            }
        }
    }
};
private TextView text_time;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    rea = findViewById(R.id.rea);
    text_time = findViewById(R.id.text_time);
    //RotateAnimation animation = new RotateAnimation(0, 360, Animation.RELATIVE_TO_SELF, 0.5F, Animation.RELATIVE_TO_SELF, 0.5F);
    //animation.setDuration(4000);
    //rea.startAnimation(animation);
    AlphaAnimation alphaAnimation = new AlphaAnimation(0, 1);
    alphaAnimation.setDuration(4000);
    rea.startAnimation(alphaAnimation);

    handler.sendEmptyMessageDelayed(0,1000);
}

}