Android的，内存不足转换为黑色和白色 [英] Android, out of memory converting to black and white

问题描述

我把一些资源，以黑色和白色，当用户触摸它们。我有这个功能在我的Util的Java文件要做到这一点：

I'm converting some resources to black and white when user touch them. I have this function to do this in my Util java file:

public static Bitmap convertColorIntoBlackAndWhiteImage(Bitmap orginalBitmap) {
    ColorMatrix colorMatrix = new ColorMatrix();
    colorMatrix.setSaturation(0);

    ColorMatrixColorFilter colorMatrixFilter = new ColorMatrixColorFilter(colorMatrix);
    Bitmap blackAndWhiteBitmap = orginalBitmap.copy(Bitmap.Config.ARGB_8888, true);

    Paint paint = new Paint();
    paint.setColorFilter(colorMatrixFilter);

    Canvas canvas = new Canvas(blackAndWhiteBitmap);
    canvas.drawBitmap(blackAndWhiteBitmap, 0, 0, paint);

    return blackAndWhiteBitmap;
}

但有时候，在某些设备上我得到这个错误：

But sometimes, in some devices I get this error:

java.lang.OutOfMemoryError
at android.graphics.Bitmap.nativeCopy(Native Method)
at android.graphics.Bitmap.copy(Bitmap.java:479)
at com.mygame.util.Util.convertColorIntoBlackAndWhiteImage(Util.java:145)

这功能的145号线是

Bitmap blackAndWhiteBitmap = orginalBitmap.copy(Bitmap.Config.ARGB_8888, true);

precisely，我把该功能从其他计算器的答案。

Precisely, I took that function from other stackoverflow answer.

这是怎么回事？

感谢您

推荐答案

这可能会帮助你...

this may help you...

public static Bitmap convertColorIntoBlackAndWhiteImage(Bitmap orginalBitmap) {
    ColorMatrix colorMatrix = new ColorMatrix();
    colorMatrix.setSaturation(0);

    ColorMatrixColorFilter colorMatrixFilter = new ColorMatrixColorFilter(
            colorMatrix);
    Bitmap blackAndWhiteBitmap = orginalBitmap.copy(
            Bitmap.Config.ARGB_8888, true);
    // Recycle the Bitmap and free the memory once you copied into new
    // Bitmap
    orginalBitmap.recycle();
    orginalBitmap = null;
    // still problem exists call
    // System.gc();
    // System.gc();

    Paint paint = new Paint();
    paint.setColorFilter(colorMatrixFilter);

    Canvas canvas = new Canvas(blackAndWhiteBitmap);
    canvas.drawBitmap(blackAndWhiteBitmap, 0, 0, paint);

    return blackAndWhiteBitmap;
}

和它好像你正试图图像转换成灰色。试试这个...

and it seems like you are trying to convert Image into gray color. try this...

    public static Bitmap toGrayBitmap(Bitmap bitmap) {
        if (bitmap == null || bitmap.isRecycled()) {
            return null;
        }
        final int width = bitmap.getWidth();
        final int height = bitmap.getHeight();

        Bitmap canvasBitmap = Bitmap.createBitmap(width, height,
                Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(canvasBitmap);
        canvas.drawARGB(0, 0, 0, 0);

        Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
        paint.setColor(Color.WHITE);
        ColorMatrix colorMatrix = new ColorMatrix();
        colorMatrix.setSaturation(0);
        ColorMatrixColorFilter filter = new ColorMatrixColorFilter(
                colorMatrix);
        paint.setColorFilter(filter);

        canvas.drawBitmap(bitmap, 0, 0, paint);
        bitmap.recycle(); // do it if still problem exists

        return canvasBitmap;
    }

这篇关于Android的，内存不足转换为黑色和白色的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！