用Movie显示gif(1)SimpleGif

 

代码如下：

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Movie;
import android.os.Build;
import android.util.AttributeSet;
import android.view.View;

import com.e.weixin.R;

public class SimpleGif extends View {

    private Movie movie;        //播放动画的类
    private long firstFrame;    //第1帧的时间

    public int gifId;           //gif的res
    public int times;           //循环次数
    public int currentFrame;    //当前播放到第几帧
    public int duration;        //动画时长


    public SimpleGif(Context context, AttributeSet attrs) {
        super(context, attrs);
        boolean b = isHardwareAccelerated();
        //在有的版本上要关闭硬件加速才显示动画，
        //也可以在manifest.xml的application,activity等元素下用android:hardwareAccelerated="false" 关闭硬件加速。
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
            setLayerType(View.LAYER_TYPE_SOFTWARE, null);
        }
        b = isHardwareAccelerated();
        gifId = R.raw.tsj01;
        //构造一个movie
        movie = Movie.decodeStream(getResources().openRawResource(gifId));
        duration = movie.duration();//动画的总共时长
        if (duration == 0) { //设置一个默认时间
            duration = 1000;
        }
        times = 1;
    }

    public void onDraw(Canvas canvas) {

        //绘制第1步，取得当前时间
        long now = android.os.SystemClock.uptimeMillis();

        //记录第1帧的时间
        if (firstFrame == 0) {// first time
            firstFrame = now;
        }

        if (movie != null) {
            //如果循环次数不为0就断续绘制。
            if (times > 0) {
                //计算当前帧的时间
                currentFrame = (int) (now - firstFrame);
                //如果当前帧大于时长，就说明是新循环开始
                if (currentFrame > duration){
                    --times;//循环次数减1
                    firstFrame = now;
                    //计算在动画时长内的帧。
                    currentFrame %= duration;
                    System.out.println(" 倒数第  " + times + " 次");
                }
                //设置当前绘制的帧
                movie.setTime(currentFrame);

                //开始绘制动画的当前帧
                movie.draw(canvas, 0, 0);

                //刷新，绘制下1帧
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
                    postInvalidateOnAnimation();
                } else {
                    invalidate();
                }
            }else{
                movie.setTime(0);//设置绘制第0帧
                movie.draw(canvas, 0, 0);//绘制
            }
        }
    }

}