Question

在这里，我创建了可扩展列表视图，其中包含艺术家的组行，而在儿童中，它显示了具有专辑封面的艺术家的所有专辑。但它抛出了内存异常。

这是我的代码获取图片：

public static Bitmap getArtwork(Context context, int album_id) {

        ContentResolver res = context.getContentResolver();
        Uri uri = ContentUris.withAppendedId(sArtworkUri, album_id);
        if (uri != null)
        {
            InputStream in = null;
            try 
            {
                in = res.openInputStream(uri);
                return BitmapFactory.decodeStream(in, null, sBitmapOptions);
            } catch (FileNotFoundException ex) 
            {
                // The album art thumbnail does not actually exist. Maybe the user deleted it, or
                // maybe it never existed to begin with.
            } finally
            {
                    if (in != null)
                    {
                        try
                        {
                            in.close();
                        } catch (IOException e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        }
                    }
                }
             }
        return null;
    }

为了创建儿童专辑列表，我已经这样做了：

private ArrayList<ArrayList<HashMap<String, Object>>> createChildList() {
    for (int i = 0; i < songsListData.size(); i++) 
    {

        ArrayList<HashMap<String,Object>> secList = new ArrayList<HashMap<String,Object>>();
        String s[] = new String[]{songsListData.get(i).get("artistname")};
        String whereClause = MediaStore.Audio.Albums.ARTIST + " = ? ";

        Cursor cursor = managedQuery(MediaStore.Audio.Albums.EXTERNAL_CONTENT_URI,null ,whereClause,s,null);

        if (cursor == null) 
        {
              //Query Failed , Handle error.
        }
        else if (!cursor.moveToFirst()) 
        {
             //No media on the device.
        }
        else
        {            
              int albumName = cursor.getColumnIndex(MediaStore.Audio.Albums.ALBUM);
              int id = cursor.getColumnIndex(MediaStore.Audio.Albums._ID);
              int songcount = cursor.getColumnIndex(MediaStore.Audio.Albums.NUMBER_OF_SONGS);

              for(int j=0;j<cursor.getCount();j++)
              {
                    String Name = cursor.getString(albumName);
                    Integer albumid = cursor.getInt(id);                        
                    Bitmap bitmap = null;
                    bitmap = getArtwork(context, albumid); //calling function
                    if(bitmap == null)
                    {
                        bitmap = BitmapFactory.decodeResource(context.getResources(),R.drawable.wallpaper);
                    }   
                    HashMap<String, Object> album = new HashMap<String, Object>();
                    album.put("albumName",Name);
                    album.put("albumId", albumid);  
                    album.put("image", bitmap);  //storing image
                    album.put("songcount",cursor.getString(songcount) + " song");
                    secList.add(album);
                    cursor.moveToNext();
               }                  
           }
           cursor.close();   
           albumData.add(secList);
    }
    return albumData;
}

我该怎么办才能处理内存不足异常。 Pleaze给我一些解决方案。感谢名单。

Answer 1

调试代码并在意外启动时跟踪堆大小这必须是由于增加图像大小您可以使用Document来了解Android如何计算图像大小

public static Bitmap getResizedBitmap(Bitmap image, int newHeight, int newWidth) {
    int width = image.getWidth();
    int height = image.getHeight();
    float scaleWidth = ((float) newWidth) / width;
    float scaleHeight = ((float) newHeight) / height;
    // create a matrix for the manipulation
    Matrix matrix = new Matrix();
    // resize the bit map
    matrix.postScale(scaleWidth, scaleHeight);
    // recreate the new Bitmap
    Bitmap resizedBitmap = Bitmap.createBitmap(image, 0, 0, width, height,
            matrix, false);
    return resizedBitmap;
}

获取专辑艺术时的内存异常

1 个答案: