GifView

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public class GifView extends View {   private Movie movie;   private long mMovieStart;   private float ratioWidth;   private float ratioHeight;   public GifView(Context context) {      this(context, null);      // TODO Auto-generated constructor stub   }   public GifView(Context context, AttributeSet attrs) {      this(context, attrs, 0);      // TODO Auto-generated constructor stub   }   public GifView(Context context, AttributeSet attrs, int defStyleAttr) {      super(context, attrs, defStyleAttr);      // TODO Auto-generated constructor stub      if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {         // 新api代码块         setLayerType(View.LAYER_TYPE_SOFTWARE, null);      }      // 获取资源属性      TypedArray ta = context.obtainStyledAttributes(attrs,            R.styleable.GifViews);      // 获取资源id      int resourceId = ta.getResourceId(R.styleable.GifViews_src, -1);      // 设置gif资源      setGifResource(context, resourceId);      // 资源回收      ta.recycle();   }   /**    * 设置默认gif资源调用，在xml布局中src属性调用    */   public void setGifResource(Context context, int resourceId) {      // Log.i("Simon", "==========:" + resourceId);      if (resourceId == -1) {         return;      }      // 获取gif动画资源      InputStream is = context.getResources().openRawResource(resourceId);      // 解码流转换为movie格式      movie = Movie.decodeStream(is);      // 重新布局      requestLayout();   }   /**    * 设置Gif资源--流Stream    */   public void setGifStream(InputStream is) {      // 解码流转换为movie格式      movie = Movie.decodeStream(is);      // 重新布局      requestLayout();   }   @Override   protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {      // super.onMeasure(widthMeasureSpec, heightMeasureSpec);      if (movie != null) {         int width = movie.width();         int height = movie.height();         if (width <= 0) {            width = 1;         }         if (height <= 0) {            height = 1;         }         int paddingLeft = getPaddingLeft();         int paddingRight = getPaddingRight();         int paddingTop = getPaddingTop();         int paddingBottom = getPaddingBottom();         width += paddingLeft + paddingRight;         height += paddingTop + paddingBottom;         width = Math.max(width, getSuggestedMinimumWidth());         height = Math.max(height, getSuggestedMinimumHeight());         int widthSize = resolveSizeAndState(width, widthMeasureSpec, 0);         int heightSize = resolveSizeAndState(height, heightMeasureSpec, 0);         ratioWidth = (float) widthSize / width;         ratioHeight = (float) heightSize / height;         setMeasuredDimension(widthSize, heightSize);      } else {         super.onMeasure(widthMeasureSpec, heightMeasureSpec);      }   }   @Override   protected void onDraw(Canvas canvas) {      // TODO Auto-generated method stub      super.onDraw(canvas);      // 查看上次时间      long now = android.os.SystemClock.uptimeMillis();      // 如果当前是第一次播放      if (mMovieStart == 0) {         mMovieStart = now;      }      if (movie != null) {         // 获取movie时间长         int duration = movie.duration();         if (duration == 0) {            duration = 1000;         }         int relTime = (int) ((now - mMovieStart) % duration);         movie.setTime(relTime);         // 最小缩放比率         float scale = Math.min(ratioWidth, ratioHeight);         canvas.scale(scale, scale);         // 从 0 0 开始绘制         movie.draw(canvas, 0, 0);         // movie.draw(canvas, getWidth() - movie.width(),         // getHeight() - movie.height());         // 重新绘制         invalidate();      }   }}
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