缓存位图时出现内存异常

时间：2013-05-10 19:47:06

标签： android memory-management out-of-memory dalvik

我正在设计一个应用程序，我希望在内存中存储12位图以便快速访问。我正在从磁盘缓存中检索这些图像，或者如果它们不存在则下载它们。我遇到的问题是运行了几次运行缓存我的应用程序在OnCreate方法中崩溃的活动，但异常

仅当Runtime.getRuntime（）。totalMemory（）的结果超过66265056

时，才会出现此异常。

05-10 15:32:44.831: E/dalvikvm-heap(26563): Out of memory on a 6554896-byte allocation. 05-10 15:32:44.831: I/dalvikvm(26563): "main" prio=5 tid=1 RUNNABLE 05-10 15:32:44.831: I/dalvikvm(26563): | group="main" sCount=0 dsCount=0 obj=0x411d96a0 self=0x411c2988 05-10 15:32:44.831: I/dalvikvm(26563): | sysTid=26563 nice=0 sched=0/0 cgrp=apps handle=1075505232 05-10 15:32:44.831: I/dalvikvm(26563): | schedstat=( 0 0 0 ) utm=872 stm=205 core=0 05-10 15:32:44.831: I/dalvikvm(26563): at android.graphics.BitmapFactory.nativeDecodeAsset(Native Method) 05-10 15:32:44.831: I/dalvikvm(26563): at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:592) 05-10 15:32:44.831: I/dalvikvm(26563): at android.graphics.BitmapFactory.decodeResourceStream(BitmapFactory.java:445) 05-10 15:32:44.831: I/dalvikvm(26563): at android.graphics.drawable.Drawable.createFromResourceStream(Drawable.java:781) 05-10 15:32:44.831: I/dalvikvm(26563): at android.content.res.Resources.loadDrawable(Resources.java:1963) 05-10 15:32:44.831: I/dalvikvm(26563): at android.content.res.TypedArray.getDrawable(TypedArray.java:601) 05-10 15:32:44.831: I/dalvikvm(26563): at android.view.View.<init>(View.java:3424) 05-10 15:32:44.831: I/dalvikvm(26563): at android.view.View.<init>(View.java:3357) 05-10 15:32:44.831: I/dalvikvm(26563): at android.view.ViewGroup.<init>(ViewGroup.java:426) 05-10 15:32:44.831: I/dalvikvm(26563): at android.widget.RelativeLayout.<init>(RelativeLayout.java:184) 05-10 15:32:44.831: I/dalvikvm(26563): at java.lang.reflect.Constructor.constructNative(Native Method) 05-10 15:32:44.831: I/dalvikvm(26563): at java.lang.reflect.Constructor.newInstance(Constructor.java:417) 05-10 15:32:44.831: I/dalvikvm(26563): at android.view.LayoutInflater.createView(LayoutInflater.java:587) 05-10 15:32:44.831: I/dalvikvm(26563): at com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:56) 05-10 15:32:44.831: I/dalvikvm(26563): at android.view.LayoutInflater.onCreateView(LayoutInflater.java:660) 05-10 15:32:44.831: I/dalvikvm(26563): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:685) 05-10 15:32:44.831: I/dalvikvm(26563): at android.view.LayoutInflater.inflate(LayoutInflater.java:466) 05-10 15:32:44.831: I/dalvikvm(26563): at android.view.LayoutInflater.inflate(LayoutInflater.java:396) 05-10 15:32:44.831: I/dalvikvm(26563): at android.view.LayoutInflater.inflate(LayoutInflater.java:352) 05-10 15:32:44.831: I/dalvikvm(26563): at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:309) 05-10 15:32:44.831: I/dalvikvm(26563): at android.app.Activity.setContentView(Activity.java:1914) 05-10 15:32:44.831: I/dalvikvm(26563): at com.afewguys.photofrenzy.activities.PreGameActivity_.setContentView(PreGameActivity_.java:48) 05-10 15:32:44.831: I/dalvikvm(26563): at com.afewguys.photofrenzy.activities.PreGameActivity_.onCreate(PreGameActivity_.java:31) 05-10 15:32:44.831: I/dalvikvm(26563): at android.app.Activity.performCreate(Activity.java:5179) 05-10 15:32:44.831: I/dalvikvm(26563): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1094) 05-10 15:32:44.831: I/dalvikvm(26563): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2074) 05-10 15:32:44.831: I/dalvikvm(26563): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2135) 05-10 15:32:44.831: I/dalvikvm(26563): at android.app.ActivityThread.access$700(ActivityThread.java:143) 05-10 15:32:44.831: I/dalvikvm(26563): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1241) 05-10 15:32:44.831: I/dalvikvm(26563): at android.os.Handler.dispatchMessage(Handler.java:99) 05-10 15:32:44.831: I/dalvikvm(26563): at android.os.Looper.loop(Looper.java:137) 05-10 15:32:44.831: I/dalvikvm(26563): at android.app.ActivityThread.main(ActivityThread.java:4950) 05-10 15:32:44.831: I/dalvikvm(26563): at java.lang.reflect.Method.invokeNative(Native Method) 05-10 15:32:44.831: I/dalvikvm(26563): at java.lang.reflect.Method.invoke(Method.java:511) 05-10 15:32:44.831: I/dalvikvm(26563): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1004) 05-10 15:32:44.831: I/dalvikvm(26563): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:771) 05-10 15:32:44.831: I/dalvikvm(26563): at dalvik.system.NativeStart.main(Native Method) 05-10 15:32:44.831: A/libc(26563): Fatal signal 11 (SIGSEGV) at 0x0031fb00 (code=1), thread 26584 (uys.photofrenzy) 05-10 15:32:44.831: A/libc(26563): Fatal signal 11 (SIGSEGV) at 0x00000000 (code=1), thread 26563 (uys.photofrenzy)

我将位图存储在Android Docs推荐的LRUCache中。而DiskLRUCache用于磁盘缓存。我无法使用DiskLRUCache的内存缓存部分，因为它无法在随机时间检索图像。我在扩展的Application类

中进行缓存 
     final int maxMemory = (int) (Runtime.getRuntime().maxMemory() / 1024);
     final int cacheSize = maxMemory / 8;
        mMemoryCache = new LruCache<String, Bitmap>(cacheSize) {
            @SuppressLint("NewApi")
            @Override
            protected int sizeOf(String key, Bitmap bitmap) {
                return bitmap.getByteCount() / 1024;
            } 
            @Override
            protected void entryRemoved(boolean evicted, String key, Bitmap oldBitmap, Bitmap newBitmap) {
                oldBitmap.recycle();
                oldBitmap = null;
            }
        };
}

public static void addBitmapToMemoryCache(String key, Bitmap bitmap) {
    if (getBitmapFromMemCache(key) == null) {
        mMemoryCache.put(key, bitmap);
    }
}
public static void clearCache(){
    mMemoryCache.evictAll();
    System.gc();
}

public static Bitmap getBitmapFromMemCache(String key) {
    return mMemoryCache.get(key);
}

缓存活动

    protected void onCreate(Bundle savedInstanceState) {        
    super.onCreate(savedInstanceState);         
    setRequestedOrientation (ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
    prefs = this.getSharedPreferences("com.afewguys.photofrenzy", Context.MODE_PRIVATE);
    File diskCacheLocation = getExternalFilesDir(C.thumbNailDir);
    BitmapLruCache.Builder builder = new BitmapLruCache.Builder(this);
    builder.setMemoryCacheEnabled(false).setMemoryCacheMaxSizeUsingHeapSize();
    builder.setDiskCacheEnabled(true).setDiskCacheLocation(diskCacheLocation);
    mCache = builder.build();
    game = DatabaseManager.getInstance().getGameEntryWithId(getIntent().getExtras().getString(C.bundleGame));
    mCache = builder.build();       
    PhotoFrenzyApplication.clearCache();
    new loadSingleView().execute();
}


class loadSingleView extends AsyncTask<String, String, String> {
    int round = 0;
    int numPhoto = 0; 
    @Override
    protected String doInBackground(String... args) {
        PhotoFrenzyApplication.clearHash();
        for(PhotoRound pr:game.getDbPhotoRounds()){
            round++;
            numPhoto = 0;
            for(Photo p:pr.getDBPhotos()){
                CacheableBitmapDrawable cView = mCache.get(p.getThumbNailLink());
                Bitmap bm = (cView != null) ? mCache.get(p.getThumbNailLink()).getBitmap() : null;
                if(bm != null){
                    PhotoFrenzyApplication.addBitmapToMemoryCache(p.getThumbNailLink(),mCache.get(p.getThumbNailLink()).getBitmap());
                    mCache.remove(p.getThumbNailLink());
                }
                else
                    PhotoFrenzyApplication.addBitmapToMemoryCache(p.getThumbNailLink(),loadNewPhoto(p.getThumbNailLink()));     PhotoFrenzyApplication.addImageToHash(loadNewPhoto(p.getOriginalLink()),p.getOriginalLink());
                System.out.println("Memory : " + Runtime.getRuntime ().totalMemory());
                publishProgress();
            }
        }
        return null;
    }

    @Override
    protected void onProgressUpdate(String... values) {
        updateRoundPhotosLoaded(round,++numPhoto);
    }        
    @Override       
    protected void onPostExecute(String args) {
        startGame();
    }
}

我已经证实，当驱逐旧位图时，循环系统会被调用。我找不到记忆的位置

1 个答案:

答案 0 :(得分：0)

首先，我建议不要在内存中保留这么大的Bitmaps。 6554896字节= 1280x1280图像，不适合大多数显示器。

您似乎在两个地方进行了缓存：Application和Activity，这很奇怪。

我建议使用MAT（Eclipse Memory Analyzer）来搜索Activity的内存泄漏。如果您发现超过1，则说明崩溃的根本原因。

除此之外，您的代码中存在一些恶意内容，例如oldBitmap.recycle();或System.gc();。

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