Android 使用动画连续移动背景 [英] Android move background continuously with animation

问题描述

我想要做的是水平移动背景并让它无限重复.

What I want to do is move the background horizontally and have it repeat infinitely.

我尝试使用带有动画的 ImageSwitcher 来实现此效果，但无法正常工作.这是我迄今为止的代码L

I tried using an ImageSwitcher with animation to give this effect, but couldn't get it to work right. This is the code I have so farL

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;
    }
}

推荐答案

为什么不尝试自己为背景设置动画，而不是使用 ViewSwitcher?您只需要一个简单的 ValueAnimator:

Why don't you try to just animate the background yourself instead of using a ViewSwitcher? All you need is one simple ValueAnimator:

首先将两个相同的 ImageViews 添加到您的布局中，并为它们设置相同的背景图像:

First add two identical ImageViews to your layout and set the same background image to both of them:

<?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 ValueAnimator 为它们的 translationX 属性设置动画，但用它们的宽度偏移它们:

Then use a ValueAnimator to animate their translationX property, but offset them by their width:

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();

这会产生一个连续的动画，它无限期地重复背景，看起来应该是这样的:

This results in an continuous animation which repeats the background indefinitely and should look something like this:

这篇关于Android 使用动画连续移动背景的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！