android decodebytearray 内存溢出,Android 使用帧动画内存溢出解决方案

心已赠人 2022-10-05 10:55 176阅读 0赞

Android 使用帧动画内存溢出解决方案

时间：2021-05-19

Android 使用帧动画内存溢出解决方案

最近在项目遇到的动画效果不好实现，就让UI切成图，采用帧动画实现效果，但是在使用animation-list时，图片也就11张，每张图片大概560k左右，结果内存溢出，崩溃 了，自己用了三张都崩溃；拿代码说；

1.anin\_searh.xml<?xml version="1.0" encoding="utf-8"?>

2.使用帧动画search\_scale\_iv.setBackgroundResource(R.drawable.anim\_search); AnimationDrawable drawable = (AnimationDrawable) search\_scale\_iv.getBackground(); drawable.start();

结果setBackgroundResource出现内存溢出，这个方法其实获取drawable时候,会消耗很多内存，很容易内存溢出，崩溃。

3.解决方法：在网上找了个类，处理，结果我使用11张560k大小图片，没有内存溢出；import android.content.Context; import android.content.res.XmlResourceParser; import android.graphics.BitmapFactory; import android.graphics.drawable.AnimationDrawable; import android.graphics.drawable.BitmapDrawable; import android.graphics.drawable.Drawable; import android.os.Handler; import android.widget.ImageView; import org.apache.commons.io.IOUtils; import org.xmlpull.v1.XmlPullParser; import org.xmlpull.v1.XmlPullParserException; import java.io.IOException; import java.util.ArrayList; import java.util.List; /\*\*\*\* \* 此工具类源于stack over flow \* 原文链接:http://stackoverflow.com/questions/8692328/causing-outofmemoryerror-in-frame-by-frame-animation-in-android \* 主要使用了BitmapFactory.decodeByteArray方法通过底层C来绘制图片,有效防止OOM \* 使用了第三方类库:org.apache.commons.io.IOUtils,将Inputstream转为byte字节数组 \* \*\*\*\*\*\*\*/ public class MyAnimationDrawable \{ public static class MyFrame \{ byte\[\] bytes; int duration; Drawable drawable; boolean isReady = false; \} public interface OnDrawableLoadedListener \{ public void onDrawableLoaded(List myFrames); \} // 1 /\*\*\* \* 性能更优 \* 在animation-list中设置时间 \* \*\*/ public static void animateRawManuallyFromXML(int resourceId, final ImageView imageView, final Runnable onStart, final Runnable onComplete) \{ loadRaw(resourceId, imageView.getContext(), new OnDrawableLoadedListener() \{ @Override public void onDrawableLoaded(List myFrames) \{ if (onStart != null) \{ onStart.run(); \} animateRawManually(myFrames, imageView, onComplete); \} \}); \} // 2 private static void loadRaw(final int resourceId, final Context context, final OnDrawableLoadedListener onDrawableLoadedListener) \{ loadFromXml(resourceId, context, onDrawableLoadedListener); \} // 3 private static void loadFromXml(final int resourceId, final Context context, final OnDrawableLoadedListener onDrawableLoadedListener) \{ new Thread(new Runnable() \{ @Override public void run() \{ final ArrayList myFrames = new ArrayList(); XmlResourceParser parser = context.getResources().getXml( resourceId); try \{ int eventType = parser.getEventType(); while (eventType != XmlPullParser.END\_DOCUMENT) \{ if (eventType == XmlPullParser.START\_DOCUMENT) \{ \} else if (eventType == XmlPullParser.START\_TAG) \{ if (parser.getName().equals("item")) \{ byte\[\] bytes = null; int duration = 1000; for (int i = 0; i < parser.getAttributeCount(); i++) \{ if (parser.getAttributeName(i).equals( "drawable")) \{ int resId = Integer.parseInt(parser .getAttributeValue(i) .substring(1)); bytes = IOUtils.toByteArray(context .getResources() .openRawResource(resId)); \} else if (parser.getAttributeName(i) .equals("duration")) \{ duration = parser.getAttributeIntValue( i, 1000); \} \} MyFrame myFrame = new MyFrame(); myFrame.bytes = bytes; myFrame.duration = duration; myFrames.add(myFrame); \} \} else if (eventType == XmlPullParser.END\_TAG) \{ \} else if (eventType == XmlPullParser.TEXT) \{ \} eventType = parser.next(); \} \} catch (IOException e) \{ e.printStackTrace(); \} catch (XmlPullParserException e2) \{ // TODO: handle exception e2.printStackTrace(); \} // Run on UI Thread new Handler(context.getMainLooper()).post(new Runnable() \{ @Override public void run() \{ if (onDrawableLoadedListener != null) \{ onDrawableLoadedListener.onDrawableLoaded(myFrames); \} \} \}); \} \}).run(); \} // 4 private static void animateRawManually(List myFrames, ImageView imageView, Runnable onComplete) \{ animateRawManually(myFrames, imageView, onComplete, 0); \} // 5 private static void animateRawManually(final List myFrames, final ImageView imageView, final Runnable onComplete, final int frameNumber) \{ final MyFrame thisFrame = myFrames.get(frameNumber); if (frameNumber == 0) \{ thisFrame.drawable = new BitmapDrawable(imageView.getContext() .getResources(), BitmapFactory.decodeByteArray( thisFrame.bytes, 0, thisFrame.bytes.length)); \} else \{ MyFrame previousFrame = myFrames.get(frameNumber - 1); ((BitmapDrawable) previousFrame.drawable).getBitmap().recycle(); previousFrame.drawable = null; previousFrame.isReady = false; \} imageView.setImageDrawable(thisFrame.drawable); new Handler().postDelayed(new Runnable() \{ @Override public void run() \{ // Make sure ImageView hasn't been changed to a different Image // in this time if (imageView.getDrawable() == thisFrame.drawable) \{ if (frameNumber + 1 < myFrames.size()) \{ MyFrame nextFrame = myFrames.get(frameNumber + 1); if (nextFrame.isReady) \{ // Animate next frame animateRawManually(myFrames, imageView, onComplete, frameNumber + 1); \} else \{ nextFrame.isReady = true; \} \} else \{ if (onComplete != null) \{ onComplete.run(); \} \} \} \} \}, thisFrame.duration); // Load next frame if (frameNumber + 1 < myFrames.size()) \{ new Thread(new Runnable() \{ @Override public void run() \{ MyFrame nextFrame = myFrames.get(frameNumber + 1); nextFrame.drawable = new BitmapDrawable(imageView .getContext().getResources(), BitmapFactory.decodeByteArray(nextFrame.bytes, 0, nextFrame.bytes.length)); if (nextFrame.isReady) \{ // Animate next frame animateRawManually(myFrames, imageView, onComplete, frameNumber + 1); \} else \{ nextFrame.isReady = true; \} \} \}).run(); \} \} //第二种方法 /\*\*\* \* 代码中控制时间,但不精确 \* duration = 1000; \* \*\*\*\*/ public static void animateManuallyFromRawResource( int animationDrawableResourceId, ImageView imageView, Runnable onStart, Runnable onComplete, int duration) throws IOException, XmlPullParserException \{ AnimationDrawable animationDrawable = new AnimationDrawable(); XmlResourceParser parser = imageView.getContext().getResources() .getXml(animationDrawableResourceId); int eventType = parser.getEventType(); while (eventType != XmlPullParser.END\_DOCUMENT) \{ if (eventType == XmlPullParser.START\_DOCUMENT) \{ \} else if (eventType == XmlPullParser.START\_TAG) \{ if (parser.getName().equals("item")) \{ Drawable drawable = null; for (int i = 0; i < parser.getAttributeCount(); i++) \{ if (parser.getAttributeName(i).equals("drawable")) \{ int resId = Integer.parseInt(parser .getAttributeValue(i).substring(1)); byte\[\] bytes = IOUtils.toByteArray(imageView .getContext().getResources() .openRawResource(resId));//IOUtils.readBytes drawable = new BitmapDrawable(imageView .getContext().getResources(), BitmapFactory.decodeByteArray(bytes, 0, bytes.length)); \} else if (parser.getAttributeName(i) .equals("duration")) \{ duration = parser.getAttributeIntValue(i, 66); \} \} animationDrawable.addFrame(drawable, duration); \} \} else if (eventType == XmlPullParser.END\_TAG) \{ \} else if (eventType == XmlPullParser.TEXT) \{ \} eventType = parser.next(); \} if (onStart != null) \{ onStart.run(); \} animateDrawableManually(animationDrawable, imageView, onComplete, 0); \} private static void animateDrawableManually( final AnimationDrawable animationDrawable, final ImageView imageView, final Runnable onComplete, final int frameNumber) \{ final Drawable frame = animationDrawable.getFrame(frameNumber); imageView.setImageDrawable(frame); new Handler().postDelayed(new Runnable() \{ @Override public void run() \{ // Make sure ImageView hasn't been changed to a different Image // in this time if (imageView.getDrawable() == frame) \{ if (frameNumber + 1 < animationDrawable.getNumberOfFrames()) \{ // Animate next frame animateDrawableManually(animationDrawable, imageView, onComplete, frameNumber + 1); \} else \{ // Animation complete if (onComplete != null) \{ onComplete.run(); \} \} \} \} \}, animationDrawable.getDuration(frameNumber)); \} \}

这里需要导入jar,import org.apache.commons.io.IOUtils;

4.然后通过上述类，来调用自己的动画xml,MyAnimationDrawable.animateRawManuallyFromXML(R.drawable.anim\_search, search\_scale\_iv, new Runnable() \{ @Override public void run() \{ // TODO onStart // 动画开始时回调 log.d("","start"); \} \}, new Runnable() \{ @Override public void run() \{ // TODO onComplete // 动画结束时回调 log.d("","end"); \} \});

这样在使用帧动画时，可以有效的适度防止内存溢出，谁还有什么办法，欢迎交流！

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