MainActivity.java

public class MainActivity extends AppCompatActivity {
    View layout2;
    private float screenWidth,screenHeight;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        // 隱藏ActionBar
        getSupportActionBar().hide();
        // 取得手機螢幕尺寸
        DisplayMetrics metrics = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(metrics);
        screenWidth = metrics.heightPixels;
        screenHeight = metrics.widthPixels;
        layout2 = findViewById(R.id.layout2);
    }


    //enter是設定在activity_layout.xml內Button的onClick欄位填入的名稱
    public void leftbutton(View v){
        AnimatorSet ans = new AnimatorSet();
        ObjectAnimator[] oan = new ObjectAnimator[3];
        // 移動Y軸，由原始位置移動screenWidth*0.45個位置
        oan[0] = ObjectAnimator.ofFloat(layout2, "translationX", 0,-(screenWidth*0.45f));
        // 縮放0.87倍
        oan[1] = ObjectAnimator.ofFloat(layout2, "scaleX", 1f,0.87f);
        oan[2] = ObjectAnimator.ofFloat(layout2, "scaleY", 1f,0.87f);
        // 動畫波形
        ans.setInterpolator(new AnticipateOvershootInterpolator());
        ans.playTogether(oan);
        ans.setDuration(450);
        ans.start();
    }
    public void rightbutton(View v){
        AnimatorSet ans = new AnimatorSet();
        ObjectAnimator[] oan = new ObjectAnimator[3];
        oan[0] = ObjectAnimator.ofFloat(layout2, "translationX", -(screenWidth*0.45f),0);
        oan[1] = ObjectAnimator.ofFloat(layout2, "scaleX", 0.87f,1f);
        oan[2] = ObjectAnimator.ofFloat(layout2, "scaleY", 0.87f,1f);
        ans.setInterpolator(new AnticipateOvershootInterpolator());
        ans.playTogether(oan);
        ans.setDuration(450);
        ans.start();
    }
}