android显示gif动态图的方法

最近的项目有了这个需求，然后上网找了找，没有找到个非常完美的方案，google上那个开源项目GifView有oom的错误，由于项目紧急，就没有深入研究代码。后来在网上找到一段代码，说白了就是一个自定义的可播放gif图片的空间。

这里使用了movie来显示，有兴趣的可以自己去研究下google的api和源代码。

import java.io.ByteArrayOutputStream;import java.io.InputStream;import android.content.Context;import android.graphics.Bitmap;import android.graphics.Bitmap.CompressFormat;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Movie;import android.util.AttributeSet;import android.view.View;public class GifView extends View {private int gifResource;private Movie mMovie;private long movieStart;public GifView(Context context, byte[] data) {super(context);// initializeView();setGIFResource(data);}public GifView(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);initializeView();}public GifView(Context context, AttributeSet attrs) {super(context, attrs);initializeView();}/** * 初始化控件 */private void initializeView() {if (gifResource != 0) {InputStream is = getContext().getResources().openRawResource(gifResource);byte[] array = streamToBytes(is);mMovie = Movie.decodeByteArray(array, 0, array.length);movieStart = 0;this.invalidate();}}/** * 设置GIF资源ID *  * @param id */public void setGIFResource(int id) {this.gifResource = id;initializeView();}/** * 获取资源ID *  * @return */public int getGIFResoure() {return gifResource;}/** * 设置GIF资源数据 *  * @param bytes */public void setGIFResource(byte[] bytes) {if (bytes == null || bytes.length <= 0) {return;}mMovie = Movie.decodeByteArray(bytes, 0, bytes.length);movieStart = 0;this.invalidate();}/** * 设置GIF资源数据 *  * @param is */public void setGIFResource(InputStream is) {if (is == null) {return;}byte[] array = streamToBytes(is);mMovie = Movie.decodeByteArray(array, 0, array.length);movieStart = 0;this.invalidate();}/** * 设置GIF资源图片 *  * @param bitmap */public void setGIFResource(Bitmap bitmap) {if (bitmap == null) {return;}ByteArrayOutputStream bos = new ByteArrayOutputStream();bitmap.compress(CompressFormat.PNG, 0 /* ignored for PNG */, bos);byte[] bitmapdata = bos.toByteArray();mMovie = Movie.decodeByteArray(bitmapdata, 0, bitmapdata.length);movieStart = 0;this.invalidate();}private static byte[] streamToBytes(InputStream is) {ByteArrayOutputStream os = new ByteArrayOutputStream(1024);byte[] buffer = new byte[1024];int len;try {while ((len = is.read(buffer)) >= 0) {os.write(buffer, 0, len);}} catch (java.io.IOException e) {}return os.toByteArray();}@Overrideprotected void onDraw(Canvas canvas) {// TODO Auto-generated method stubcanvas.drawColor(Color.TRANSPARENT);super.onDraw(canvas);long now = android.os.SystemClock.uptimeMillis();if (movieStart == 0) {movieStart = now;}int d = mMovie.duration();if (d <= 0) {d = 1500;}if (mMovie != null) {int relTime = (int) ((now - movieStart) % d);mMovie.setTime(relTime);mMovie.draw(canvas, (getWidth() - mMovie.width()) / 2, (getHeight() - mMovie.height()) / 2);this.invalidate();}}}

特别注意：

使用movie时，你需要把这个控件的硬件加速关闭，否则同样无法播放。貌似硬件加速的属性是3.0以后才有的。

方法是：

gifView.setLayerType(View.LAYER_TYPE_SOFTWARE, null);