Android通过动画不断移动背景

Question

我想要做的是水平移动背景并让它无限重复.

我尝试使用ImageSwitcher动画来产生这种效果,但无法使其正常工作.这是我到目前为止的代码

public class MainActivity extends AppCompatActivity implements ViewSwitcher.ViewFactory {

    private Animation animSlide;
    private ImageSwitcher image;
    private ImageView imagePop;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        image = (ImageSwitcher) findViewById(R.id.image_switcher);

        image.setFactory(this);
        image.setImageResource(R.drawable.zc06);
        Animation in = AnimationUtils.loadAnimation(this, android.R.anim.slide_in_left);
        in.setDuration(10000);
        Animation out = AnimationUtils.loadAnimation(this, android.R.anim.slide_out_right);
        out.setDuration(10000);
        image.setInAnimation(in);
        image.setOutAnimation(out);
        Timer timer = new Timer();
        timer.scheduleAtFixedRate(new TimerTask() {

            @Override
            public void run() {
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        image.setImageResource(R.drawable.zc06);
                    }
                });
            }

        }, 0, 10000);

        Animation mZoomInAnimation = AnimationUtils.loadAnimation(this, R.anim.zoom_in);

        Animation mZoomOutAnimation = AnimationUtils.loadAnimation(this, R.anim.zoom_out);
        imagePop.startAnimation(mZoomInAnimation);
        imagePop.startAnimation(mZoomOutAnimation);

    }

    @Override
    public View makeView() {
        ImageView myView = new ImageView(getApplicationContext());
        return myView;
    }
}

Answer 1

你为什么不尝试自己动画背景而不是使用ViewSwitcher？所有你需要的只是一个简单ValueAnimator:

首先添加两个与ImageViews布局相同的内容,并将相同的背景图像设置为两个:

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ImageView
        android:id="@+id/background_one"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:src="@drawable/background"/>

    <ImageView
        android:id="@+id/background_two"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:src="@drawable/background"/>

</FrameLayout>

然后使用a ValueAnimator来为其translateX属性设置动画,但是按宽度偏移它们:

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

final ValueAnimator animator = ValueAnimator.ofFloat(0.0f, 1.0f);
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();

这导致连续动画无限期地重复背景,应该看起来像这样:

Answer 2

您可以使用AndroidScrollingImageView库，只需定义速度和可绘制源

<com.q42.android.scrollingimageview.ScrollingImageView
    android:id="@+id/scrolling_background"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    scrolling_image_view:speed="1dp"
    scrolling_image_view:src="@drawable/scrolling_background" />

编辑：

如@Cliff Burton所述，如果要垂直滚动，可以将视图旋转90度。