假设你常常听歌。你会发现歌曲app的背景会随着音乐移动的，从左到右或者从上到下。这样的动画尽管简单，可是这里有一个技巧。
假设你还不明确这样的动效看看以下的demo
(很多其它具体请參考：） 一，使用setImageMatrix播放图片动画 以下是官方文档给出的解释 
你能够看到这里的解释非常easy。就是取代ImageView的图像矩阵。然后configureBounds和invalidate被调用。 在java代码中我们能够设置Matrix的scaleType mImageView.setScaleType(ScaleType.MATRIX)
或者在xml文件里设置
android:scaleType="matrix"
以下是ImageView的初始矩阵（matrix)
在x和y方向上放大2倍 final Matrix matrix = new Matrix();matrix.postScale(2, 2);imageView.setImageMatrix(matrix);
final Matrix matrix = new Matrix();matrix.postScale(2, 2);matrix.postRotate(15);imageView.setImageMatrix(matrix);
float scaleFactor = (float)imageView.getHeight() / (float) drawable.getIntrinsicHeight();mMatrix.postScale(scaleFactor, scaleFactor);
这样我们就能保证图片的高和ImageView同样，而且填充满ImageView.
接下来我们就让ImageView的图片移动，我们要用到一个强大的Android动画框架：ValueAnimator,其原理就是利用ImageView的图像矩阵在x轴方向变换移动。mAnimator = ValueAnimator.ofFloat(0, 100);mAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator animation) { float value = (Float) animation.getAnimatedValue(); matrix.reset(); matrix.postScale(scaleFactor, scaleFactor); matrix.postTranslate(-value, 0); imageView.setImageMatrix(matrix); }});mAnimator.setDuration(5000);mAnimator.start(); 整个代码例如以下：
package com.testimageview;import android.animation.Animator;import android.animation.AnimatorListenerAdapter;import android.animation.ValueAnimator;import android.app.Activity;import android.graphics.Matrix;import android.graphics.RectF;import android.os.Bundle;import android.widget.ImageView;public class MainActivity extends Activity{ private static final int RightToLeft = 1; private static final int LeftToRight = 2; private static final int DURATION = 5000; private ValueAnimator mCurrentAnimator; private final Matrix mMatrix = new Matrix(); private ImageView mImageView; private float mScaleFactor; private int mDirection = RightToLeft; private RectF mDisplayRect = new RectF(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mImageView = (ImageView) findViewById(R.id.imageView); mImageView.post(new Runnable() { @Override public void run() { mScaleFactor = (float) mImageView.getHeight() / (float) mImageView.getDrawable().getIntrinsicHeight(); mMatrix.postScale(mScaleFactor, mScaleFactor); mImageView.setImageMatrix(mMatrix); animate(); } }); } private void animate() { updateDisplayRect(); if(mDirection == RightToLeft) { animate(mDisplayRect.left, mDisplayRect.left - (mDisplayRect.right - mImageView.getWidth())); } else { animate(mDisplayRect.left, 0.0f); } } private void animate(float from, float to) { mCurrentAnimator = ValueAnimator.ofFloat(from, to); mCurrentAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator animation) { float value = (Float) animation.getAnimatedValue(); mMatrix.reset(); mMatrix.postScale(mScaleFactor, mScaleFactor); mMatrix.postTranslate(value, 0); mImageView.setImageMatrix(mMatrix); } }); mCurrentAnimator.setDuration(DURATION); mCurrentAnimator.addListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator animation) { if(mDirection == RightToLeft) mDirection = LeftToRight; else mDirection = RightToLeft; animate(); } }); mCurrentAnimator.start(); } private void updateDisplayRect() { mDisplayRect.set(0, 0, mImageView.getDrawable().getIntrinsicWidth(), mImageView.getDrawable().getIntrinsicHeight()); mMatrix.mapRect(mDisplayRect); }}