位图 - 内存不足异常

当我尝试从相机或图库获取图像时，出现错误。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，可让我拍摄图像：

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);

and at onActivityResult() I do:

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.

我收到错误bitmapSelectedImage = BitmapFactory.decodeFile(filePath); line.

我查了很多网站/主题，但没有人能提供帮助。

有什么建议么？

您的内存分配堆大小非常有限。 尝试将高分辨率图像从文件加载到堆很容易导致内存不足错误。

假设相机应用程序确实采用非常高分辨率（几乎可以肯定是这种情况），您应该仅按照显示所需的大小将位图的缩放版本加载到内存中。

已建议您查看的文档 -http://developer.android.com/training/displaying-bitmaps/load-bitmap.html提供了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）所需的比例。 那就是calculateInSampleSize method.

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 and reqWith是显示图像的图像视图的高度和宽度（以像素为单位）。 假设您的图像视图是 100x100 像素，您需要做的就是：

bitmapSelectedImage = getSampleBitmapFromFile(filePath, 100, 100);