Android通过Movie展示Gif格式图片

本文实例为大家分享Android通过Movie展示Gif格式图片的相关代码，供大家参考，具体内容如下

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);
   }
 }
}

自定义属性res/values/attrs.xml文件：

<?xml version="1.0" encoding="utf-8"?>
<resources>

<declare-styleable name="custom_gif_view">
   <attr name="gif_src" format="reference"></attr>
 </declare-styleable>

</resources>

在Activity中使用：

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();
   }

}
}