Android性能优化---帧动画OOM？优化帧动画之SurfaceView逐帧解析
作者：互联网
setBackgroundTransparent();
}
private void setBackgroundTransparent() {
getHolder().setFormat(PixelFormat.TRANSLUCENT);
setZOrderOnTop(true);
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
isAlive = true;
startDrawThread();
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
stopDrawThread();
isAlive = false;
}
//停止帧绘制线程
private void stopDrawThread() {
handlerThread.quit();
handler = null;
}
//启动帧绘制线程
private void startDrawThread() {
handlerThread = new HandlerThread(“SurfaceViewThread”);
handlerThread.start();
handler = new Handler(handlerThread.getLooper());
handler.post(new DrawRunnable());
}
private class DrawRunnable implements Runnable {
@Override
public void run() {
if (!isAlive) {
return;
}
try {
//1.获取画布
canvas = getHolder().lockCanvas();
//2.绘制一帧
onFrameDraw(canvas);
} catch (Exception e) {
e.printStackTrace();
} finally {
//3.将帧数据提交
getHolder().unlockCanvasAndPost(canvas);
//4.一帧绘制结束
onFrameDrawFinish();
}
//不停的将自己推送到绘制线程的消息队列以实现帧刷新
handler.postDelayed(this, frameDuration);
}
}
protected abstract void onFrameDrawFinish();
protected abstract void onFrameDraw(Canvas canvas);
}
- 用HandlerThread作为独立帧绘制线程，好处是可以通过与其绑定的Handler方便地实现“每隔一段时间刷新”，而且在Surface被销毁的时候可以方便的调用HandlerThread.quit()来结束线程执行的逻辑。
- DrawRunnable.run()运用模版方法模式定义了绘制算法框架，其中帧绘制逻辑的具体实现被定义成两个抽象方法，推迟到子类中实现，因为绘制的东西是多样的，对于本文来说，绘制的就是一张张图片，
《Android学习笔记总结+最新移动架构视频+大厂安卓面试真题+项目实战源码讲义》
【docs.qq.com/doc/DSkNLaERkbnFoS0ZF】 完整内容开源分享
所以新建BaseSurfaceView的子类FrameSurfaceView;
逐帧解析 & 及时回收
public class FrameSurfaceView extends BaseSurfaceView {
public static final int INVALID_BITMAP_INDEX = Integer.MAX_VALUE;
private List bitmaps = new ArrayList<>();
//帧图片
private Bitmap frameBitmap;
//帧索引
private int bitmapIndex = INVALID_BITMAP_INDEX;
private Paint paint = new Paint();
private BitmapFactory.Options options = new BitmapFactory.Options();
//帧图片原始大小
private Rect srcRect;
//帧图片目标大小
private Rect dstRect = new Rect();
private int defaultWidth;
private int defaultHeight;
public void setDuration(int duration) {
int frameDuration = duration / bitmaps.size();
setFrameDuration(frameDuration);
}
public void setBitmaps(List bitmaps) {
if (bitmaps == null || bitmaps.size() == 0) {
return;
}
this.bitmaps = bitmaps;
//默认情况下，计算第一帧图片的原始大小
getBitmapDimension(bitmaps.get(0));
}
private void getBitmapDimension(Integer integer) {
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeResource(this.getResources(), integer, options);
defaultWidth = options.outWidth;
defaultHeight = options.outHeight;
srcRect = new Rect(0, 0, defaultWidth, defaultHeight);
requestLayout();
}
public FrameSurfaceView(Context context) {
super(context);
}
@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
super.onLayout(changed, left, top, right, bottom);
dstRect.set(0, 0, getWidth(), getHeight());
}
@Override
protected void onFrameDrawFinish() {
//在一帧绘制完后，直接回收它
recycleOneFrame();
}
//回收帧
private void recycleOneFrame() {
if (frameBitmap != null) {
frameBitmap.recycle();
frameBitmap = null;
}
}
@Override
protected void onFrameDraw(Canvas canvas) {
//绘制一帧前需要先清画布，否则所有帧都叠在一起同时显示
clearCanvas(canvas);
if (!isStart()) {
return;
}
if (!isFinish()) {
drawOneFrame(canvas);
} else {
onFrameAnimationEnd();
}
}
//绘制一帧，是张Bitmap
private void drawOneFrame(Canvas canvas) {
frameBitmap = BitmapUtil.decodeOriginBitmap(getResources(), bitmaps.get(bitmapIndex), options);
canvas.drawBitmap(frameBitmap, srcRect, dstRect, paint);
bitmapIndex++;
}
private void onFrameAnimationEnd() {
reset();
}
private void reset() {
bitmapIndex = INVALID_BITMAP_INDEX;
}
//帧动画是否结束
private boolean isFinish() {
return bitmapIndex >= bitmaps.size();
}
//帧动画是否开始
private boolean isStart() {
return bitmapIndex != INVALID_BITMAP_INDEX;
}
//开始播放帧动画
public void start() {
bitmapIndex = 0;
}
private void clearCanvas(Canvas canvas) {
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR));
canvas.drawPaint(paint);
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC));
}
}
- FrameSurfaceView继承自BaseSurfaceView，所以它复用了基类的绘制框架算法，并且定了自己每一帧的绘制内容：一张Bitmap。
- Bitmap资源 id 通过setBitmaps()传递进来， 绘制一帧解析一张 ，在每一帧绘制完毕后，调用Bitmap.recycle()释放图片 native 内存并去除 java 堆中图片像素数据的引用。这样当 GC 发生时，图片像素数据可以及时被回收。
一切都是这么地能够自圆其说，我迫不及待地运行代码并打开AndroidStudio的Profiler标签页，切换到MEMORY，想用真实内存数据验证下性能。但残酷的事实狠狠地打了下脸。。。多次播放帧动画后，内存占用居然比原生AnimationDrawable还大，而且每播放一次，内存中都会多出 N 个Bitmap对象（N为帧动画总帧数）。唯一令人欣慰的是，手动触发 GC 后帧动画图片能够被回收。（AnimationDrawable中的图片数据不会被 GC）
原因就在于自作聪明地及时回收，每一帧绘制完后帧数据被回收，那下一帧解析Bitmap时只能新申请一块内存。帧动画每张图片大小是一致的，是不是能复用上一帧Bitmap的内存空间？于是乎有了下面这个版本的FrameSurfaceView：
逐帧解析 & 帧复用
public class FrameSurfaceView extends BaseSurfaceView {
public static final int INVALID_BITMAP_INDEX = Integer.MAX_VALUE;
private List bitmaps = new ArrayList<>();
private Bitmap frameBitmap;
private int bitmapIndex = INVALID_BITMAP_INDEX;
private Paint paint = new Paint();
private BitmapFactory.Options options;
private Rect srcRect;
private Rect dstRect = new Rect();
public void setDuration(int duration) {
int frameDuration = duration / bitmaps.size();
setFrameDuration(frameDuration);
}
public void setBitmaps(List bitmaps) {
if (bitmaps == null || bitmaps.size() == 0) {
return;
}
this.bitmaps = bitmaps;
getBitmapDimension(bitmaps.get(0));
}
private void getBitmapDimension(Integer integer) {
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeResource(this.getResources(), integer, options);
defaultWidth = options.outWidth;
defaultHeight = options.outHeight;
srcRect = new Rect(0, 0, defaultWidth, defaultHeight);;
}
public FrameSurfaceView(Context context) {
super(context);
}
@Override
protected void init() {
super.init();
//定义解析Bitmap参数为可变类型，这样才能复用Bitmap
options = new BitmapFactory.Options();
options.inMutable = true;
}
@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
super.onLayout(changed, left, top, right, bottom);
dstRect.set(0, 0, getWidth(), getHeight());
}
@Override
protected int getDefaultWidth() {
return defaultWidth;
}
@Override
protected int getDefaultHeight() {
return defaultHeight;
}
标签：动画,OOM,void,private,bitmaps,int,new,优化,public 来源： https://blog.csdn.net/m0_65146205/article/details/122127095