Android Bitmap Scale scaleBitmapIfNeededToSize(Bitmap bitmap, long size)

Description

scale Bitmap If Needed To Size

License

Open Source License

Declaration

public static byte[] scaleBitmapIfNeededToSize(Bitmap bitmap, long size) 

Method Source Code

//License from project: Open Source License 

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import org.ixming.android.utils.FrameworkLog;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Bitmap.CompressFormat;
import android.graphics.Bitmap.Config;
import android.graphics.BitmapFactory;

public class Main{
    static final String TAG = "sharebind_bitmaputil";
    public static byte[] scaleBitmapIfNeededToSize(Bitmap bitmap, long size) {
        byte[] data = null;
        try {/* w w  w .ja v a2 s.c  o  m*/
            float width = bitmap.getWidth();
            float height = bitmap.getHeight();
            data = bmpToByteArray(bitmap, false);
            float des = data.length;
            des = des / size;
            if (des <= 1) {
                return data;
            }
            final float scale;
            if (des <= 2.5F) {
                scale = 0.95F;
            } else if (des <= 5.0F) {
                scale = 0.9F;
            } else if (des <= 7.5F) {
                scale = 0.85F;
            } else {
                scale = 0.8F;
            }
            while (true) {
                if (null == data || data.length <= size) {
                    break;
                }
                Bitmap bitmapCopy = bitmap;
                width *= scale;
                height *= scale;
                bitmap = Bitmap.createScaledBitmap(bitmapCopy, (int) width,
                        (int) height, true);
                bitmapCopy.recycle();
                data = bmpToByteArray(bitmap, false);
            }
        } catch (Exception e) {
            data = null;
            FrameworkLog.e(
                    TAG,
                    "scaleBitmapIfNeededToSize Exception: "
                            + e.getMessage());
        }
        return data;
    }
    
    public static byte[] bmpToByteArray(final Bitmap bmp,
            final boolean needRecycle) {
        if (null == bmp) {
            return null;
        }
        ByteArrayOutputStream output = null;
        try {
            output = new ByteArrayOutputStream();
            bmp.compress(CompressFormat.PNG, 100, output);
            if (needRecycle) {
                bmp.recycle();
            }
            byte[] result = output.toByteArray();
            return result;
        } catch (Exception e) {
            FrameworkLog.e(TAG,
                    "bmpToByteArray Exception: " + e.getMessage());
            return null;
        } finally {
            if (null != output) {
                try {
                    output.close();
                } catch (Exception ex) {
                }
            }
        }
    }
}

Related

1. getScalBitmap(String file, int destW, int destH)
2. getScaledBitmap(Bitmap bitmap, int width, int height)
3. getScaledBitmapByHeight(Bitmap bm, int newHeight)
4. scaleBitmap(Bitmap bitmap, int dstWidth, int dstHeight)
5. scaleBitmap(Bitmap bitmap, int targetwidth)
6. scaleBitmapKeepRatio(Bitmap bitmap, int dstWidth, int dstHeight)
7. scaleToTextSize(Bitmap bmp, float textSize)
8. scaleToScreen(Activity activity, Bitmap bitmap)
9. scaleImage(Bitmap image, float scale)