Android通过Movie展示Gif格式图片

public class CommonGifView extends View {  private Resources mResources;  private Movie mMovie;  private long startTime = 0;  private float widthRatio;  private float heightRatio;  public CommonGifView(Context context) {    this(context, null);  }  public CommonGifView(Context context, AttributeSet attrs) {    this(context, attrs, 0);  }  public CommonGifView(Context context, AttributeSet attrs, int defStyleAttr) {    super(context, attrs, defStyleAttr);    mResources = context.getResources();    TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.custom_gif_view);    int src_id = ta.getResourceId(R.styleable.custom_gif_view_gif_src, -1);    setGifViewBg(src_id);    ta.recycle();  }  /**   * 为View设置gif格式图片背景   * @description：   * @author ldm   * @date 2016-2-18 上午9:21:16   */  private void setGifViewBg(int src_id) {    if (src_id == -1) { return; }    // 获取对应资源文件的输入流    InputStream is = mResources.openRawResource(src_id);    mMovie = Movie.decodeStream(is);// 解码输入流为Movie对象    requestLayout();  }  /*   * 这个方法供Activity中使用   */  public void setGifStream(InputStream is) {    mMovie = Movie.decodeStream(is);    requestLayout();  }  @Override  protected void onDraw(Canvas canvas) {    super.onDraw(canvas);    long now = SystemClock.uptimeMillis();    if (startTime == 0) { // 如果第一帧，记录起始时间      startTime = now;    }    if (mMovie != null) {// 如果返回值不等于null，就说明这是一个GIF图片      int duration = mMovie.duration();// 取出动画的时长      if (duration == 0) {        duration = 1000;      }      int currentTime = (int) ((now - startTime) % duration);// 算出需要显示第几帧      mMovie.setTime(currentTime);      // mMovie.draw(canvas, getWidth() - mMovie.width(), getHeight() - mMovie.height());      float scale = Math.min(widthRatio, heightRatio);      canvas.scale(scale, scale);      mMovie.draw(canvas, 0, 0);      invalidate();    }  }  @Override  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {    if (mMovie != null) {// 如果返回值不等于null，就说明这是一个GIF图片      int w = mMovie.width();//宽度      int h = mMovie.height();//高度      if (w <= 0) {        w = 1;      }      if (h <= 0) {        h = 1;      }      int left = getPaddingLeft();      int right = getPaddingRight();      int top = getPaddingTop();      int bottom = getPaddingBottom();      int widthSize, heightSize;      w += left + right;      h += top + bottom;      w = Math.max(w, getSuggestedMinimumWidth());      h = Math.max(h, getSuggestedMinimumHeight());      widthSize = resolveSizeAndState(w, widthMeasureSpec, 0);//根据你提供的大小和MeasureSpec，返回你想要的大小值      heightSize = resolveSizeAndState(h, heightMeasureSpec, 0);      widthRatio = (float) widthSize / w;      heightRatio = (float) heightSize / h;      setMeasuredDimension(widthSize, heightSize);    }    else {      super.onMeasure(widthMeasureSpec, heightMeasureSpec);    }  }}

<?xml version="1.0" encoding="utf-8"?><resources>  <declare-styleable name="custom_gif_view">    <attr name="gif_src" format="reference"></attr>  </declare-styleable></resources>

public class MainActivity extends Activity {  private CommonGifView view;  private InputStream is;  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    view = (CommonGifView) findViewById(R.id.gif_test);    try {      is = getAssets().open("test01.gif");      view.setGifStream(is);    }    catch (IOException e) {      e.printStackTrace();    }  }}