位图创建内存不足

Question

我正在尝试从相机 Intent 旋转 onActivityResult() 中拍摄的图像，但偶尔会出现内存不足错误。

如何优化这段代码？

http://pastebin.com/ieaHS8qB

bmp = BitmapFactory.decodeStream(new FileInputStream(f), null, null);
correctBmp = Bitmap.createBitmap(bmp, 0, 0, bmp.getWidth(), 
                bmp.getHeight(), mat, true);

我试图在这些行之后添加bmp.recycle() 和correctBmp.recycle()，但没有帮助。

Answer 1

如果你开发你的应用程序 api 级别 10+，你可以添加你的清单

 android:largeHeap="true" //add this entity.

喜欢

  <application
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:largeHeap="true"
    android:theme="@android:style/Theme.NoTitleBar.Fullscreen" >

或试试这个（创建类）

   public Bitmap decodeSampledBitmapFromResource(Resources res, int resId,
        int reqWidth, int reqHeight) {

    // First decode with inJustDecodeBounds=true to check dimensions
    final BitmapFactory.Options options = new BitmapFactory.Options();
    options.inJustDecodeBounds = true;
    BitmapFactory.decodeResource(res, resId, options);

    // Calculate inSampleSize
    options.inSampleSize = calculateInSampleSize(options, reqWidth,
            reqHeight);

    // Decode bitmap with inSampleSize set
    options.inJustDecodeBounds = false;
    return BitmapFactory.decodeResource(res, resId, options);
}

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) {
        if (width > height) {
            inSampleSize = Math.round((float) height / (float) reqHeight);
        } else {
            inSampleSize = Math.round((float) width / (float) reqWidth);
        }
    }
    return inSampleSize;
}

感谢该代码，您还可以调整位图的大小。

Answer 2

尝试在解码流之前添加以下代码并将选项作为参数传递。

BitmapFactory.Options options = new BitmapFactory.Options();                
options.inSampleSize = 5;               
options.inPurgeable = true;             
options.inInputShareable = true;


bmp = BitmapFactory.decodeStream(new FileInputStream(f),null, options);