Question

当我尝试从相机或图库中获取图像时，我收到错误消息。这是logcat的一部分：

06-27 05:51:47.297: E/dalvikvm-heap(438): Out of memory on a 35295376-byte allocation.
06-27 05:51:47.312: E/dalvikvm(438): Out of memory: Heap Size=108067KB, Allocated=71442KB, Limit=131072KB
06-27 05:51:47.312: E/dalvikvm(438): Extra info: Footprint=108067KB, Allowed Footprint=108067KB, Trimmed=56296KB
06-27 05:51:47.312: E/PowerManagerService(438): Excessive delay when setting lcd brightness: mLcdLight.setBrightness(176, 1) spend 288ms, mask=2
06-27 05:51:48.052: E/dalvikvm-heap(4332): Out of memory on a 24023056-byte allocation.
06-27 05:51:48.057: E/dalvikvm(4332): Out of memory: Heap Size=63139KB, Allocated=40922KB, Limit=65536KB
06-27 05:51:48.057: E/dalvikvm(4332): Extra info: Footprint=63139KB, Allowed Footprint=63139KB, Trimmed=0KB
06-27 05:51:48.057: E/EmbeddedLogger(438): App crashed! Process: <my_app_name>

这是我的代码，可以让我拍摄一张照片：

Intent pickIntent = new Intent();
pickIntent.setType("image/*");
pickIntent.setAction(Intent.ACTION_GET_CONTENT);

Intent takePhotoIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

Intent chooserIntent = Intent.createChooser(pickIntent, "Select or take a new Picture");
chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, new Intent[] { takePhotoIntent });
startActivityForResult(chooserIntent, selectPic);

并在onActivityResult()我这样做：

Bitmap bitmapSelectedImage = null;
Uri selectedImage =  data.getData();
String[] filePathColumn = { MediaStore.Images.Media.DATA };

Cursor cursor = getContentResolver().query(selectedImage, filePathColumn, null, null, null);
cursor.moveToFirst();

String filePath = cursor.getString(cursor.getColumnIndex(filePathColumn[0]));
cursor.close();
bitmapSelectedImage = BitmapFactory.decodeFile(filePath); // Here is where do I get error.

我在bitmapSelectedImage = BitmapFactory.decodeFile(filePath);行收到错误。

我看过很多网站/主题，但没有人能帮忙。

有什么建议吗？

Answer 1

你的内存分配堆大小是非常有限的。尝试将高分辨率图像从文件加载到堆中很容易导致内存不足错误。

假设相机应用程序确实采用了非常高的分辨率（几乎可以肯定是这种情况），您应该将显示所需大小的位图的缩放版本加载到内存中。

您已建议查看的文件 - http://developer.android.com/training/displaying-bitmaps/load-bitmap.html 提供完整的功能方法来做到这一点。

1）第一步是计算（不加载到内存中）所需的比例。这是calculateInSampleSize方法。

public static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) {
    // Raw height and width of image
    final int height = options.outHeight;
    final int width = options.outWidth;
    int inSampleSize = 1;

    if (height > reqHeight || width > reqWidth) {

        // Calculate ratios of height and width to requested height and
        // width
        final int heightRatio = Math.round((float)height / (float)reqHeight);
        final int widthRatio = Math.round((float)width / (float)reqWidth);

        // Choose the smallest ratio as inSampleSize value, this will
        // guarantee
        // a final image with both dimensions smaller than or equal to the
        // requested height and width.
        inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;
    }

    return inSampleSize;
}

2）第二步是使用步骤1的完整方法：

public static Bitmap getSampleBitmapFromFile(String bitmapFilePath, int reqWidth, int reqHeight) {
    // calculating image size
    BitmapFactory.Options options = new BitmapFactory.Options();
    options.inJustDecodeBounds = true;
    BitmapFactory.decodeStream(new FileInputStream(new File(bitmapFilePath)), null, options);

    int scale = calculateInSampleSize(options, reqWidth, reqHeight);

    BitmapFactory.Options o2 = new BitmapFactory.Options();
    o2.inSampleSize = scale;

    return BitmapFactory.decodeStream(new FileInputStream(new File(bitmapFilePath)), null, o2);

}

reqHeight和reqWith是显示图像的图像视图的高度和宽度（以像素为单位）。所以假设你的图像视图是100x100像素，你需要做的就是：

bitmapSelectedImage = getSampleBitmapFromFile(filePath, 100, 100);

Answer 2

如果位图大小非常大或无法处理，则会出现此问题。要有效地解码位图，您可以在Android开发者网站上查看这些提示。

Displaying Bitmaps Efficiently

Answer 3

不要对位图使用强引用。使用如下。始终使用弱引用，以便系统可以gc对象并减少内存泄漏

WeakReference<Bitmap> bitmapSelectedImage ;

Answer 4

您需要缩小图像。

http://developer.android.com/training/displaying-bitmaps/load-bitmap.html

使用适当的Bitmap.decode方法缩小图像。

Bitmap.decode

示例：

使用所需参数调用方法。

public static Bitmap decodeFile(File f,int WIDTH,int HIGHT){
 try {
     //Decode image size
     BitmapFactory.Options o = new BitmapFactory.Options();
     o.inJustDecodeBounds = true;
     BitmapFactory.decodeStream(new FileInputStream(f),null,o);

     //The new size we want to scale to
     final int REQUIRED_WIDTH=WIDTH;
     final int REQUIRED_HIGHT=HIGHT;
     //Find the correct scale value. It should be the power of 2.
     int scale=1;
     while(o.outWidth/scale/2>=REQUIRED_WIDTH && o.outHeight/scale/2>=REQUIRED_HIGHT)
         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;
}

Answer 5

这段代码对我有用：试试这个

Bitmap ThumbImage = ThumbnailUtils.extractThumbnail（bitmap，100,100）;

位图 - 内存不足异常

5 个答案: