自制android gif动画解析器

package com.tz.dream.pa.gifanimation;

import java.io.IOException;
import java.io.InputStream;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Movie;
import android.os.Handler;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.view.SurfaceHolder;
import android.view.SurfaceHolder.Callback;
import android.view.SurfaceView;

public class GifSurfaceView extends SurfaceView implements Callback {

private SurfaceHolder holder;

// gif图片路径
private String path;

private Movie movie;

// 放大倍数
private int zoom = 1;

// 执行动画
private Handler handler = new Handler();

// 线程
private Runnable runnable = new Runnable() {

@Override
public void run() {
// 获取画布(加锁)
Canvas canvas = holder.lockCanvas();

canvas.save();

canvas.scale(zoom, zoom);

// 画图片(设置图片显示的位置)
movie.draw(canvas, 0, 0);

// 逐帧绘制图片(图片数量5)
// 1 2 3 4 5 6 7 8 9 10
// 1 2 3 4 0 1 2 3 4 0
movie.setTime((int) (System.currentTimeMillis() % movie.duration()));

canvas.restore();

// 画画完成(解锁)
holder.unlockCanvasAndPost(canvas);

handler.postDelayed(runnable, 50);
}
};

public void setPath(String path) {
this.path = path;
}

public void setZoom(int zoom) {
this.zoom = zoom;
}

public GifSurfaceView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
initParam();
}

public GifSurfaceView(Context context, AttributeSet attrs) {
super(context, attrs);
initParam();
}

public GifSurfaceView(Context context) {
super(context);
initParam();
}

/**
* 初始化参数
*/
private void initParam() {
holder = getHolder();
holder.addCallback(this);

// handler = new Handler();
}

/**
* 计算视图宽高
*/
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
// 加载gif图片
// 1、获取gif图片路径
if (!TextUtils.isEmpty(path)) {
try {
// 加载gif图片
InputStream stream = getContext().getAssets().open(path);
movie = Movie.decodeStream(stream);
// 获取gif图片宽高
int width = movie.width();
int height = movie.height();
setMeasuredDimension((int)(width*zoom), (int)(height*zoom));
// 执行gif动画
handler.post(runnable);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}

@Override
public void surfaceCreated(SurfaceHolder holder) {

}

@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {

}

@Override
public void surfaceDestroyed(SurfaceHolder holder) {
// 停止gif动画
handler.removeCallbacks(runnable);
}

}

package com.tz.dream.pa.gifanimation;

import android.app.Activity;
import android.os.Bundle;

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

GifSurfaceView gifSurfaceView = (GifSurfaceView) findViewById(R.id.gsv);
gifSurfaceView.setPath("mn.gif");
}

}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="${relativePackage}.${activityClass}" >

<com.tz.dream.pa.gifanimation.GifSurfaceView
android:id="@+id/gsv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true" />

</RelativeLayout>