Java Android 使用动画连续移动背景
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原文地址: http://stackoverflow.com/questions/36894384/
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Android move background continuously with animation
提问by Praveen Pandey
What I want to do is move the background horizontally and have it repeat infinitely.
我想要做的是水平移动背景并让它无限重复。
I tried using an ImageSwitcherwith animation to give this effect, but couldn't get it to work right. This is the code I have so farL
我尝试使用ImageSwitcherwith 动画来产生这种效果，但无法正常工作。这是我迄今为止的代码L
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;
}
}
采纳答案by Xaver Kapeller
Why don't you try to just animate the background yourself instead of using a ViewSwitcher? All you need is one simple ValueAnimator:
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：
First add two identical ImageViewsto your layout and set the same background image to both of them:
首先添加两个相同ImageViews的布局并为它们设置相同的背景图像：
<?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>
Then use a ValueAnimatorto animate their translationX property, but offset them by their width:
然后使用 aValueAnimator为它们的 translationX 属性设置动画，但用它们的宽度偏移它们：
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();
This results in an continuous animation which repeats the background indefinitely and should look something like this:
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：
回答by Mohamed Ibrahim
you can use AndroidScrollingImageViewLibrary, all you have to do is to define speed and the drawable source
您可以使用AndroidScrollingImageView库，您所要做的就是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" />
EDIT:
编辑：
as @Cliff Burton mentioned, you can rotate the view by 90 deg if you want to scroll vertically.
正如@Cliff Burton 提到的，如果您想垂直滚动，可以将视图旋转 90 度。
