在android中创建位图时内存不足

时间:2015-05-07 09:10:28

标签: android bitmap bitmapfactory

如何缩放此位图图像时出现内存异常

Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
            bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
            return bitmap;

如何解决这个问题? 以下错误即将到来

  

05-07 13:13:30.329:E / dalvikvm-heap(17186):内存不足   8294416字节分配。 05-07 13:13:30.339:E / AndroidRuntime(17186):   致命异议:主05-07 13:13:30.339:E / AndroidRuntime(17186):   过程:com.example,PID:17186 05-07 13:13:30.339:   E / AndroidRuntime(17186):java.lang.OutOfMemoryError 05-07   13:13:30.339:E / AndroidRuntime(17186):at   android.graphics.Bitmap.nativeCreate(Native Method)05-07   13:13:30.339:E / AndroidRuntime(17186):at   android.graphics.Bitmap.createBitmap(Bitmap.java:819)05-07   13:13:30.339:E / AndroidRuntime(17186):at   android.graphics.Bitmap.createBitmap(Bitmap.java:796)05-07   13:13:30.339:E / AndroidRuntime(17186):at   android.graphics.Bitmap.createBitmap(Bitmap.java:763)05-07   13:13:30.339:E / AndroidRuntime(17186):at   com.example.QRCode.encodeAsBitmap(QRCode.java:135)

1 个答案:

答案 0 :(得分:2)

将该位图的缩小版本加载到内存中。做一个简短的谷歌研究将指导您进入Loading Large Bitmaps Efficently。 他们有这个示例代码:

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) {

        final int halfHeight = height / 2;
        final int halfWidth = width / 2;

        // Calculate the largest inSampleSize value that is a power of 2 and keeps both
        // height and width larger than the requested height and width.
        while ((halfHeight / inSampleSize) > reqHeight
                && (halfWidth / inSampleSize) > reqWidth) {
            inSampleSize *= 2;
        }
    }

    return inSampleSize;
}

public static 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);
}