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My requirement is what ever the size(width,height not file size) image stored in the database i need to retrieving that as simple passport size of image.

My code is :

byte[] imgByte=null;

in the oncreate method

imageview=new ImageView(this);
imageview.setLayoutParams(llp2);
imgByte=cursor.getBlob(cursor.getColumnIndex("imagestore"));
imageview.setScaleType(ScaleType.CENTER);
imageview.setImageBitmap(BitmapFactory.decodeByteArray(imgByte, 0, imgByte.length));
layout.addView(imageview)

when i displaying that displayed only what ever the size before enter. so i need to fit that image size in the android.

I tried these links

Reduce size of Bitmap to some specified pixel in Android

but the problem here is i got image in byte. But all codes image data type int only. can i get the correct solution to decrease the image size pragmatically?

4

1 回答 1

0

您可以使用以下代码创建样本大小的图像。这将返回Bitmap。

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);
} 

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 larger than or equal to the
        // requested height and width.
        inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;
    }

    return inSampleSize;
}

使用此代码，

decodeSampledBitmapFromResource(getResources(),R.drawable.xyz, 100, 100);

在这里，您提供 100 * 100 的样本大小。因此，将创建这种大小的缩略图。

编辑

要在代码中使用 bytes[]，请使用以下短代码。

public static Bitmap decodeSampledBitmap(byte[] data, int reqWidth,
        int reqHeight) {

    // First decode with inJustDecodeBounds=true to check dimensions
    final BitmapFactory.Options options = new BitmapFactory.Options();
    options.inJustDecodeBounds = true;
    BitmapFactory.decodeByteArray(data, 0, data.length, options);

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

    // Decode bitmap with inSampleSize set
    options.inJustDecodeBounds = false;
    return BitmapFactory.decodeByteArray(data, 0, data.length, options);
}
于 2013-07-10T09:09:15.007 回答