Android Open Source - crop Bitmap Image Cropper

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License

The source code is released under:

Apache License

Java Source Code

package net.flask.crop;
/*from w w w  .  jav  a 2 s.  c  o m*/
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Rect;
import android.os.Environment;
import android.util.Log;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

public class BitmapImageCropper {
  private int width, height;

  public BitmapImageCropper(int width, int height) {
    this.width = width;
    this.height = height;
  }

  public Bitmap crop(String path, Rect region, int orientation) {
    Bitmap bitmap = getSampledSizeBitmap(path);
    if (orientation % 180 == 90)
      bitmap = BitmapUtil.rotate(bitmap, orientation);
    return Bitmap.createBitmap(bitmap, region.left, region.top, region.width() - 1, region.height() - 1, null, true);
  }

  public Bitmap scaleDown(Bitmap bitmap, int width, int height) {
    return BitmapUtil.scale(bitmap, width, height);
  }

  public boolean save(Bitmap bitmap, String path) {
    FileOutputStream outStream = null;

    try {
      outStream = new FileOutputStream(path);
      bitmap.compress(Bitmap.CompressFormat.PNG, 100, outStream);
      Log.d("SettingAct.saveBitmap", "onPictureTaken - wrote bytes: " + bitmap.getRowBytes() * bitmap.getHeight());
      return true;
    } catch (Exception e) {
      e.printStackTrace();
      return false;
    } finally {
      if (outStream != null) {
        try {
          outStream.close();
        } catch (IOException e) {
          e.printStackTrace();
        }
      }
    }
  }

  private Bitmap getSampledSizeBitmap(String path) {
    BitmapFactory.Options opt = new BitmapFactory.Options();
    opt.inSampleSize = getOptimizedSampleSize(path, Math.max(width, height));
    return resolveBitmap(path, opt);
  }

  private Bitmap resolveBitmap(String path, BitmapFactory.Options options) {
    return BitmapFactory.decodeFile(path, options);
  }

  private int getOptimizedSampleSize(String fileName, int targetSize) {
    BitmapFactory.Options options = new BitmapFactory.Options();
    options.inJustDecodeBounds = true;

    BitmapFactory.decodeFile(fileName, options);
    return calcRate(targetSize, options);
  }

  private int calcRate(int targetSize, BitmapFactory.Options options) {
    int bitmapMaxSize = Math.min(options.outWidth, options.outHeight);
    int result = 1;
    if (targetSize < bitmapMaxSize)
      result = getBinaryNumberLessThan((int) (((float) bitmapMaxSize) / targetSize));
    return result;
  }

  private int getBinaryNumberLessThan(int n) {
    int result;
    for (result = 1; result < 32; result++)
      if (n >> result == 0)
        break;
    return (int) Math.pow(2, result - 1);
  }
}

Java Source Code List

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