Android-為圖像設置動畫而不設置imageView

Question

在我的應用中，我想為從一側流入而另一側流出的圖像設置動畫。 我曾經像下面的代碼那樣對背景進行動畫處理，但是在那種方法中，我在activity_main設置了一個imageView，當將動畫圖像設置在屏幕之外時，我不知道將imageView放在哪里：

public class MainActivity extends AppCompatActivity {

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

        setContentView(R.layout.activity_main);


        final ImageView backgroundOne = (ImageView) findViewById(R.id.background_one);
        final ImageView backgroundTwo = (ImageView) findViewById(R.id.background_two);

        final ValueAnimator animator = ValueAnimator.ofFloat(1.0f, 0.0f);
        animator.setRepeatCount(ValueAnimator.INFINITE);
        animator.setInterpolator(new LinearInterpolator());
        animator.setDuration(10000L);
        animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                final float progress = (float) animation.getAnimatedValue();
                final float width = backgroundOne.getWidth();
                final float translationX = width * progress;
                backgroundOne.setTranslationX(translationX);
                backgroundTwo.setTranslationX(translationX - width);
            }
        });
        animator.start();

    }

}

Answer 1

使用動態插入的圖像（image_layout.xml）創建單獨的布局：

<ImageView
    android:id="@+id/anim_image"
    android:layout_width="200dp"
    android:layout_height="200dp"
    android:src="..."/>

接下來，使用“充氣機”：

ViewGroup mainLayout = (ViewGroup) findViewById(R.id.main);
    v = (ViewGroup) getLayoutInflater().inflate(R.layout.image_layout, mainLayout, false);
    mainLayout.addView(v);

    final ImageView backgroundOne = (ImageView) v.findViewById(R.id.anim_image);

完成：

 ViewGroup mainLayout = (ViewGroup) findViewById(R.id.main);
    v = (ViewGroup) getLayoutInflater().inflate(R.layout.image_layout, mainLayout, false);
    mainLayout.addView(v);

    final ImageView backgroundOne = (ImageView) v.findViewById(R.id.anim_image);

    final ValueAnimator animator = ValueAnimator.ofFloat(1.0f, 0.0f);
    animator.setRepeatCount(ValueAnimator.INFINITE);
    animator.setInterpolator(new LinearInterpolator());
    animator.setDuration(10000L);
    animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
        @Override
        public void onAnimationUpdate(ValueAnimator animation) {
            final float progress = (float) animation.getAnimatedValue();
            final float width = v.getWidth();
            final float translationX = width * progress;
            v.setTranslationX(translationX);
            v.setTranslationX(translationX - width);
        }
    });
    animator.start();