Java-大图像的Android OutOfMemoryError

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该方法对大尺寸图像抛出OutOfMemoryError(不是按分辨率)
我有12张MP照片,它们的大小都不同(1.5MB,2.5MB,3.2MB,4.1MB)等,并且它们的分辨率均为4000 x 3000(像素).

resizer方法适用于大小小于3MB的图像,但是对于那些大于3MB的图像,它会抛出OutOfMemoryError我不知道该如何解决,我的应用程序主要用于调整大图像的大小,这真的使我无处可去.

调整大小的方法是：

public File resizeBitmap(String imPath, int reqSizE) {
    File fl = null;
    try{

    // First decode with inJustDecodeBounds=true to check dimensions

    final BitmapFactory.options options = new BitmapFactory.options();
    options.inJustDecodeBounds = true;

    BitmapFactory.decodeFile(imPath, options);

    // Calculate inSampleSize

    options.inSampleSize = calculateInSampleSize(options, reqSizE);

    // Decode bitmap with inSampleSize set

    options.inJustDecodeBounds = false;
    Bitmap saveImg = BitmapFactory.decodeFile(imPath, options);

    //save resized image
    String tmpName = "IMG_"+String.valueOf(System.currentTimeMillis()) + ".jpg";
    fl = fileCache.getRawFile(tmpName);
    FiLeoutputStream fos = new FiLeoutputStream(fl);
    saveImg.compress(Bitmap.CompressFormat.JPEG, 95, fos);
    saveImg.recycle();


    return fl;
}
catch (Throwable eeX){
    eex.printStackTrace();
    if(eex instanceof OutOfMemoryError) {
        runOnUiThread(new Runnable() {
            public void run() {
                Toast.makeText(Resizer.this, "Memory ran out", Toast.LENGTH_SHORT).show();
            }
        });
    }
    return null;
 }
}
//Method for calculaTing insamplesize
public int calculateInSampleSize(BitmapFactory.options options, int reqSizE) {
// Raw height and width of image
final int height = options.outHeight;
final int width = options.outWidth;
Log.i("width",""+width);
Log.i("height",""+height);
int inSampleSize = 1;

if (height > reqSize || width > reqSizE) {

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


}

return inSampleSize;

}

//Stacktrace
04-11 09:01:19.832: W/System.err(8832): java.lang.outOfMemoryError
04-11 09:01:19.953: W/System.err(8832):     at  android.graphics.bitmapFactory.nativeDecodeStream(Native Method)
04-11 09:01:19.972: W/System.err(8832):     at android.graphics.bitmapFactory.decodeStream(BitmapFactory.java:529)
04-11 09:01:19.993: W/System.err(8832):     at com.scale.app.Resizer.resizeBitmap(Resizer.java:1290)

解决方法:

Read Article

图片尺寸：4000 * 3000像素

当图像加载时：4000 * 3000 * 4 =？ KB

因此,Android设备的虚拟堆内存为：32 MB,64 MB,128 MB …

如果您使用：

<application

    android:largeHeap="true">

</application>

这将使VHM增加一倍(如果32 MB = 2 * 32 MB).注意,这不是实现此目的的好方法,对OS产生影响

您需要减小图像的尺寸.

使用下面的类并传递图像的路径和width,height您想要的

类：：：：

public class BitmapSize{



public static Bitmap getDecodedBitmap(String path, float target_width, float target_height) {
    Bitmap outBitmap = null;
    try {
        Options decode_options = new Options();
        decode_options.inJustDecodeBounds = true;
        BitmapFactory.decodeFile(path,decode_options);  //This will just fill the output parameters
        int inSampleSize = calculateInSampleSize(decode_options, target_width, target_height);

        Options outOptions = new Options();
        outOptions.inJustDecodeBounds = false;
        outOptions.inSampleSize = inSampleSize;
        outOptions.inPreferredConfig = Bitmap.Config.ARGB_8888;
        outOptions.inScaled = false;

        Bitmap decodedBitmap = BitmapFactory.decodeFile(path,outOptions);
        outBitmap = Bitmap.createScaledBitmap(decodedBitmap,// (int)target_width, (int)target_height, truE);
                (int)((float)decodedBitmap.getWidth() / inSampleSizE),
                (int)((float)decodedBitmap.getHeight() / inSampleSizE), truE);
        System.out.println("Decoded Bitmap: Width "  + outBitmap.getWidth() + " Height = " + outBitmap.getHeight() + " inSampleSize = " + inSampleSizE);

    } catch (Exception E) {
        // TODO: handle exception
    }

    return outBitmap;
}

public static int calculateInSampleSize(Options options, float reqWidth, float reqHeight) {
    final int height = options.outHeight;
    final int width = options.outWidth;
    int inSampleSize = 1;

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

        final int heightRatio = Math.round((float) height
                / (float) reqHeight);
        final int widthRatio = Math.round((float) width / (float) reqWidth);

        inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;
    }

    return inSampleSize;
}

}

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