android– 访问应用程序内部时出现内存缓存错误

概述我搜索了很多,但我不明白我的错误在哪里.首先在我的应用程序中,如果没有网络我从网络获取图像我从创建的数据库中获取它们.我要发布我的ImageLoader类然后是内存类然后是utils类如果有什么问题请我需要一些帮助提前谢谢.publicclassClassImageLoader{ClassMemoryCachememo

我搜索了很多,但我不明白我的错误在哪里.
首先在我的应用程序中,如果没有网络我从网络获取图像我从创建的数据库中获取它们.
我要发布我的ImageLoader类然后是内存类然后是utils类如果有什么问题请我需要一些帮助提前谢谢.

public class ClassImageLoader {ClassMemoryCache memoryCache=new ClassMemoryCache();ClassfileCache fileCache;private Map<ImageVIEw, String> imageVIEws=Collections.synchronizedMap(new WeakHashMap<ImageVIEw, String>());ExecutorService executorService; public ClassImageLoader(Context context){    fileCache=new ClassfileCache(context);    executorService=Executors.newFixedThreadPool(5);}final int stub_ID=R.drawable.restlogobutton;public voID displayImage(String url, ImageVIEw imageVIEw){    imageVIEws.put(imageVIEw, url);    Bitmap bitmap=memoryCache.get(url);    if(bitmap!=null)        imageVIEw.setimageBitmap(bitmap);    else    {        queuePhoto(url, imageVIEw);        imageVIEw.setimageResource(stub_ID);    }}private voID queuePhoto(String url, ImageVIEw imageVIEw){    PhotoToload p=new PhotoToload(url, imageVIEw);    executorService.submit(new Photosloader(p));}private Bitmap getBitmap(String url) {    file f=fileCache.getfile(url);    //from SD cache    Bitmap b = decodefile(f);    if(b!=null)        return b;    //from web    try {        Bitmap bitmap=null;        URL imageUrl = new URL(url);        httpURLConnection conn = (httpURLConnection)imageUrl.openConnection();        conn.setConnectTimeout(30000);        conn.setReadTimeout(30000);        conn.setInstanceFollowRedirects(true);        inputStream is=conn.getinputStream();        OutputStream os = new fileOutputStream(f);        ClassUtils.copyStream(is, os);        os.close();        bitmap = decodefile(f);        return bitmap;    } catch (Exception ex){       ex.printstacktrace();       return null;    }}//decodes image and scales it to reduce memory consumptionprivate Bitmap decodefile(file f){    try {        //decode image size        BitmapFactory.Options o = new BitmapFactory.Options();        o.inJustDecodeBounds = true;        BitmapFactory.decodeStream(new fileinputStream(f),null,o);        //Find the correct scale value. It should be the power of 2.        final int required_SIZE=70;        int wIDth_tmp=o.outWIDth, height_tmp=o.outHeight;        int scale=1;        while(true){            if(wIDth_tmp/2<required_SIZE || height_tmp/2<required_SIZE)                break;            wIDth_tmp/=2;            height_tmp/=2;            scale*=2;        }        //decode with inSampleSize        BitmapFactory.Options o2 = new BitmapFactory.Options();        o2.inSampleSize=scale;        return BitmapFactory.decodeStream(new fileinputStream(f), null, o2);    } catch (fileNotFoundException e) {}    return null;}//Task for the queueprivate class PhotoToload{    public String url;    public ImageVIEw imageVIEw;    public PhotoToload(String u, ImageVIEw i){        url=u;         imageVIEw=i;    }}class Photosloader implements Runnable {    PhotoToload photoToload;    Photosloader(PhotoToload photoToload){        this.photoToload=photoToload;    }    public voID run() {        if(imageVIEwReused(photoToload))            return;        Bitmap bmp=getBitmap(photoToload.url);        memoryCache.put(photoToload.url, bmp);        if(imageVIEwReused(photoToload))            return;        Bitmapdisplayer bd=new Bitmapdisplayer(bmp, photoToload);        Activity a=(Activity)photoToload.imageVIEw.getContext();        a.runOnUiThread(bd);    }}boolean imageVIEwReused(PhotoToload photoToload){    String tag=imageVIEws.get(photoToload.imageVIEw);    if(tag==null || !tag.equals(photoToload.url))        return true;    return false;}//Used to display bitmap in the UI threadclass Bitmapdisplayer implements Runnable{    Bitmap bitmap;    PhotoToload photoToload;    public Bitmapdisplayer(Bitmap b, PhotoToload p){bitmap=b;photoToload=p;}    public voID run()    {        if(imageVIEwReused(photoToload))            return;        if(bitmap!=null)            photoToload.imageVIEw.setimageBitmap(bitmap);        else            photoToload.imageVIEw.setimageResource(stub_ID);    }}public voID clearCache() {    memoryCache.clear();    fileCache.clear();}

}

public class ClassMemoryCache {private Map<String, Bitmap> cache=Collections.synchronizedMap(        new linkedHashMap<String, Bitmap>(10,1.5f,true));//Last argument true for LRU orderingprivate long size=0;//current allocated sizeprivate long limit=1000000;//max memory in bytespublic ClassMemoryCache(){    //use 25% of available heap size    setlimit(Runtime.getRuntime().maxMemory()/4);}public voID setlimit(long new_limit){    limit=new_limit;}public Bitmap get(String ID){    if(!cache.containsKey(ID))        return null;    return cache.get(ID);}public voID put(String ID, Bitmap bitmap){    try{        if(cache.containsKey(ID))            size-=getSizeInBytes(cache.get(ID));        cache.put(ID, bitmap);        size+=getSizeInBytes(bitmap);        checkSize();    }catch(Throwable th){        th.printstacktrace();    }}private voID checkSize() {    if(size>limit){        Iterator<Entry<String, Bitmap>> iter=cache.entrySet().iterator();//least recently accessed item will be the first one iterated          while(iter.hasNext()){            Entry<String, Bitmap> entry=iter.next();            size-=getSizeInBytes(entry.getValue());            iter.remove();            if(size<=limit)                break;        }    }}public voID clear() {    cache.clear();}long getSizeInBytes(Bitmap bitmap) {    if(bitmap==null)        return 0;    return bitmap.getRowBytes() * bitmap.getHeight();}

}

public class ClassUtils {public static voID copyStream(inputStream is, OutputStream os){    final int buffer_size=1024;    try    {        byte[] bytes=new byte[buffer_size];        for(;;)        {          int count=is.read(bytes, 0, buffer_size);          if(count==-1)              break;          os.write(bytes, 0, count);        }    }    catch(Exception ex){}}

}

解决方法:

//在您的代码中替换此方法并尝试我不确定它是否会解决您的错误,但一旦您可以尝试.

private Bitmap getBitmap(String url)     {        //I IDentify images by hashcode. Not a perfect solution, good for the demo.        String filename=String.valueOf(url.hashCode());        file f=new file(cacheDir, filename);        //from SD cache        Bitmap b = decodefile(f);        if(b!=null)            return b;        //from web        try {            Bitmap bitmap=null;            inputStream is=new URL(url).openStream();            OutputStream os = new fileOutputStream(f);            Utils.copyStream(is, os);            os.close();            bitmap = decodefile(f);            return bitmap;        }        catch (Exception ex){           ex.printstacktrace();           return null;        }    }//decodes image and scales it to reduce memory consumptionprivate Bitmap decodefile(file f){    try {        //decode image size        BitmapFactory.Options o = new BitmapFactory.Options();        o.inJustDecodeBounds = true;        BitmapFactory.decodeStream(new fileinputStream(f),null,o);        //Find the correct scale value. It should be the power of 2.        final int required_SIZE=70;        int wIDth_tmp=o.outWIDth, height_tmp=o.outHeight;        int scale=1;        while(true){            if(wIDth_tmp/2<required_SIZE || height_tmp/2<required_SIZE)                break;            wIDth_tmp/=2;            height_tmp/=2;            scale*=2;        }        //decode with inSampleSize        BitmapFactory.Options o2 = new BitmapFactory.Options();        o2.inTempStorage = new byte[32*1024];         o2.inSampleSize=scale;        return BitmapFactory.decodeStream(new fileinputStream(f), null, o2);    } catch (fileNotFoundException e) {}    return null;}

检查ImageLoaderClass的此链接：
http://code.google.com/p/vimeoid/source/browse/apk/src/com/fedorvlasov/lazylist/ImageLoader.java

OOM问题检查此链接：
Strange out of memory issue while loading an image to a Bitmap object

如果您仍然收到错误,请检查我在多次搜索后找到的这个链接并解决了我的问题：
https://groups.google.com/forum/?fromgroups=#!topic/android-developers/vYWKY1Y6bUo

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