android - 图像内存不足错误

Question

我在 ListView 中显示图像并出现内存不足错误任何人指导我解决这个问题的方法是什么这是我的代码

日志猫

ERROR/AndroidRuntime(1010): java.lang.OutOfMemoryError: bitmap size exceeds VM budget
ERROR/AndroidRuntime(1010):     at android.graphics.BitmapFactory.nativeDecodeByteArray(Native Method)
ERROR/AndroidRuntime(1010):     at android.graphics.BitmapFactory.decodeByteArray(BitmapFactory.java:405)
ERROR/AndroidRuntime(1010):     at android.graphics.BitmapFactory.decodeByteArray(BitmapFactory.java:418)
ERROR/AndroidRuntime(1010):     at com.Adapters.AdapterTours.getView(AdapterTours.java:73)
ERROR/AndroidRuntime(1010):     at android.widget.AbsListView.obtainView(AbsListView.java:1409)
ERROR/AndroidRuntime(1010):     at android.widget.ListView.makeAndAddView(ListView.java:1745)
ERROR/AndroidRuntime(1010):     at android.widget.ListView.fillUp(ListView.java:700)
ERROR/AndroidRuntime(1010):     at android.widget.ListView.fillGap(ListView.java:646)
ERROR/AndroidRuntime(1010):     at android.widget.AbsListView.trackMotionScroll(AbsListView.java:3399)
ERROR/AndroidRuntime(1010):     at android.widget.AbsListView.onTouchEvent(AbsListView.java:2233)
ERROR/AndroidRuntime(1010):     at android.widget.ListView.onTouchEvent(ListView.java:3446)
ERROR/AndroidRuntime(1010):     at android.view.View.dispatchTouchEvent(View.java:3885)
ERROR/AndroidRuntime(1010):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:903)
ERROR/AndroidRuntime(1010):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942)
ERROR/AndroidRuntime(1010):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942)
ERROR/AndroidRuntime(1010):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942)
ERROR/AndroidRuntime(1010):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942)
ERROR/AndroidRuntime(1010):     at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1691)
ERROR/AndroidRuntime(1010):     at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1125)
ERROR/AndroidRuntime(1010):     at android.app.Activity.dispatchTouchEvent(Activity.java:2096)
ERROR/AndroidRuntime(1010):     at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1675)
ERROR/AndroidRuntime(1010):     at android.view.ViewRoot.deliverPointerEvent(ViewRoot.java:2194)
ERROR/AndroidRuntime(1010):     at android.view.ViewRoot.handleMessage(ViewRoot.java:1878)
ERROR/AndroidRuntime(1010):     at android.os.Handler.dispatchMessage(Handler.java:99)
ERROR/AndroidRuntime(1010):     at android.os.Looper.loop(Looper.java:130)
ERROR/AndroidRuntime(1010):     at android.app.ActivityThread.main(ActivityThread.java:3683)
ERROR/AndroidRuntime(1010):     at java.lang.reflect.Method.invokeNative(Native Method)
ERROR/AndroidRuntime(1010):     at java.lang.reflect.Method.invoke(Method.java:507)
ERROR/AndroidRuntime(1010):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
ERROR/AndroidRuntime(1010):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
ERROR/AndroidRuntime(1010):     at dalvik.system.NativeStart.main(Native Method)

获取 View 方法

public View getView(final int position, View convertView, ViewGroup parent) {

      ViewHolder holder;

      if (convertView == null) {
        convertView = mInflater.inflate(R.layout.list_tours, null);
        holder = new ViewHolder();
        holder.tourTitle = (TextView) convertView.findViewById(R.id.tourTitle);
        holder.tourIcon = (ImageView) convertView.findViewById(R.id.tourIcon);
        holder.tourDetail = (TextView) convertView.findViewById(R.id.tourDetail);
        convertView.setTag(holder);

      } else {
        holder = (ViewHolder) convertView.getTag();
      }


      DalTours tour = getItem(position);

        String tempTag = String.valueOf(tour.getId());
        holder.tourIcon.setTag(tempTag);

        if(tour.getImageByteArray() != null)
        {
            Bitmap image = BitmapFactory.decodeByteArray(tour.getImageByteArray(), 0, tour.getImageByteArray().length);
            holder.tourIcon.setImageDrawable(getScaledImage(image));
            image = null;

        }else
        {


            holder.tourIcon.setTag(tour);
            Bitmap cachedImage = ImageLoader.loadBitmap(tour,new ImageLoader.ImageCallback() {

                @Override
                public void imageLoaded(Bitmap imageBitmap, DalTours tour) {
                    ImageView image = (ImageView)listview.findViewWithTag(tour);
                     if(image != null)
                      {

                      try
                      {  
                          ByteArrayOutputStream stream = new ByteArrayOutputStream();
                          if(imageBitmap != null)
                          {


                              image.setImageDrawable(getScaledImage(imageBitmap));
                              imageBitmap.compress(CompressFormat.PNG, 0 ,stream);
                              byte[] bitmapdata = stream.toByteArray();
                              tours.get(position).setImageByteArray(bitmapdata);


                         }
                          stream = null;
                      }finally
                      {

                      }
                      }

                }
            });
              holder.tourIcon.setImageDrawable(getScaledImage(cachedImage));

        }

      holder.tourTitle.setText(tours.get(position).getTitle());
      holder.tourDetail.setText(tours.get(position).getDetail());

      return convertView;
    }

图像缩放函数

 public Drawable getScaledImage(Bitmap actualBitmap)
    {
        BitmapDrawable bmd= null;
        if(actualBitmap != null)
        {

            int width = actualBitmap.getWidth();
            int height = actualBitmap.getHeight();

            Activity parent = (Activity)context;
            Display display = parent.getWindowManager().getDefaultDisplay(); 
            int Screenwidth = display.getWidth();
            int Screenheight = display.getHeight();


         float newWidth = (Screenwidth*35)/100;

         float temp = newWidth / width;
         float newHeight =  temp * height;



        float scaleWidth = ((float) newWidth) / width;
        float scaleHeight = ((float) newHeight) / height;

        Matrix matrix = new Matrix();

        matrix.postScale(scaleWidth, scaleHeight);
        Bitmap resizedBitmap = Bitmap.createBitmap(actualBitmap, 0, 0, 
                          width, height, matrix, true); 

        bmd = new BitmapDrawable(resizedBitmap);
        }
        return bmd;

    }

图像加载器类

public  class ImageLoader {
    private static HashMap<String, SoftReference<Bitmap>> imageCache;

    public ImageLoader() {
        //imageCache = new HashMap<String, SoftReference<Bitmap>>();
    }

    public static Bitmap loadBitmap(final DalTours tour, final ImageCallback imageCallback) {
        if(imageCache == null)
            imageCache = new HashMap<String, SoftReference<Bitmap>>();

        if (imageCache.containsKey(tour.getImageurl())) {
            SoftReference<Bitmap> softReference = imageCache.get(tour.getImageurl());
            Bitmap Bitmap = softReference.get();
            if (Bitmap != null) {
                return Bitmap;
            }
        }
        final Handler handler = new Handler() {
            @Override
            public void handleMessage(Message message) {
                imageCallback.imageLoaded((Bitmap) message.obj, tour);
            }
        };
        new Thread() {
            @Override
            public void run() {
                Bitmap Bitmap = loadImageFromUrl(tour.getImageurl());
                imageCache.put(tour.getImageurl(), new SoftReference<Bitmap>(Bitmap));
                Message message = handler.obtainMessage(0, Bitmap);
                handler.sendMessage(message);
            }
        }.start();
        return null;
    }

    public static Bitmap loadImageFromUrl(String url) {

        Bitmap bm;
        try {  

                URL aURL = new URL(url);  
                URLConnection conn = aURL.openConnection(); 

                conn.connect();  
                InputStream is = null;
                try
                {
                 is= conn.getInputStream();  
                }catch(IOException e)
                {
                     return null;
                }

                BufferedInputStream bis = new BufferedInputStream(is);  

                bm = BitmapFactory.decodeStream(bis);  
                bis.close();  
                is.close();  

           } catch (IOException e) {  
            return null;
           }  

           return  bm;


    }

    public interface ImageCallback {
        public void imageLoaded(Bitmap imageBitmap, DalTours tour);
    }
}

我们将不胜感激

Answer 1

要解决 android.graphics.BitmapFactory.nativeDecodeByteArray 处的 java.lang.OutOfMemoryError 异常，您应该使用以下代码:

BitmapFactory.Options options=new BitmapFactory.Options();// Create object of bitmapfactory's option method for further option use
options.inPurgeable = true; // inPurgeable is used to free up memory while required
Bitmap songImage1 = BitmapFactory.decodeByteArray(thumbnail,0, thumbnail.length,options);//Decode image, "thumbnail" is the object of image file
Bitmap songImage = Bitmap.createScaledBitmap(songImage1, 50 , 50 , true);// convert decoded bitmap into well scalled Bitmap format.

imageview.SetImageDrawable(songImage);