Generate thumbnail form image Uri

BitmapResize.java

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;

import java.io.IOException;
import java.io.InputStream;


public class BitmapResize {

    public static Bitmap thumbnail(Context context, Uri uri, int minWidth, int minHeight) throws IOException {
        InputStream inputStream = context.getContentResolver().openInputStream(uri);

        final BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeStream(inputStream, null, options);

        // Calculate inSampleSize
        options.inSampleSize = calculateInSampleSize(options, minWidth, minHeight);

        // close the input stream
        inputStream.close();

        // reopen the input stream
        inputStream = context.getContentResolver().openInputStream(uri);

        // Decode bitmap with inSampleSize set
        options.inJustDecodeBounds = false;
        return BitmapFactory.decodeStream(inputStream, null, options);
    }

    public static int calculateInSampleSize(BitmapFactory.Options options, int requestedWidth, int requestedHeight) {
        final int height = options.outHeight;
        final int width = options.outWidth;
        int inSampleSize = 1;

        if (height > requestedHeight || width > requestedWidth) {
            final int halfHeight = height / 2;
            final int halfWidth = width / 2;

            while ((halfHeight / inSampleSize) > requestedHeight
                    || (halfWidth / inSampleSize) > requestedWidth) {
                inSampleSize *= 2;
            }
        }

        return inSampleSize;
    }
}