Android 显示gif动画

我创建了一个自定义ImageView，该视图既可以加载Gif也可以加载普通图片（如jpg，png，bmp）

package com.chy.view;

import java.io.File;

import android.content.Context;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Movie;
import android.os.SystemClock;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.widget.ImageView;

/**
* gif视图
*/
public class PowerImageView extends ImageView {

private long timeStart = 0;
private boolean isStopGif = false;
private Movie movie = null;

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

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

public PowerImageView(Context context) {
super(context);
}

@Override
protected void onDraw(Canvas canvas) {
if (movie == null || isStopGif || movie.duration() == 0) {
super.onDraw(canvas);
} else {
long timeNow = SystemClock.uptimeMillis();
if (timeStart == 0) {
timeStart = timeNow;
}
if ((timeNow - timeStart) >= movie.duration()) {
timeStart = 0;
}
int timeRel = (int) ((timeNow - timeStart) % movie.duration());
movie.setTime(timeRel);
float wScale = movie.width()/(float)getWidth();
float hScale = movie.height()/(float)getHeight();
canvas.scale(wScale, hScale);
movie.draw(canvas, 0, 0);
invalidate();
}
}

@Override
public void setImageResource(int resId) {
movie = null;
super.setImageResource(resId);
}

public void setImage(String path) {
movie = null;
if(TextUtils.isEmpty(path)) {
setImageBitmap(null);
} else {
setImageBitmap(BitmapFactory.decodeFile(path));
}
}

public void setGif(String path) {
setImageBitmap(null);
if (TextUtils.isEmpty(path)) {
return;
}
File file = new File(path);
if (!file.exists()) {
return;
}
//movie只能解析gif图
movie = Movie.decodeFile(path);
if (movie == null) {
setImageBitmap(BitmapFactory.decodeFile(path));
}
}

public boolean isStopGif() {
return isStopGif;
}

public void setStopGif(boolean isStopGif) {
this.isStopGif = isStopGif;
}

}

百度搜索 ”在Android中显示GIF动画“，第一条便是以下链接
http://blog.csdn.net/loongggdroid/article/details/21166563
该作者写的GifView继承自普通的View，比较复杂。我个人认为在实际的工作中用我的这个GifView就足够了。

码数太多，不过虽然不太实用，但那位作者代码中透入的知识点也是比较全面的，适合初学者们多加琢磨和吸收。