Android Open Source - Android-Fast-ImageLoader Image Util

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License

The source code is released under:
Apache License
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Java Source Code

package com.sunny.util;
//  w ww .j av a 2 s .  co m
import java.io.IOException;

import android.annotation.TargetApi;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.Canvas;
import android.graphics.ColorMatrix;
import android.graphics.ColorMatrixColorFilter;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.media.ExifInterface;
import android.os.Build;

@TargetApi(Build.VERSION_CODES.ECLAIR)
public class ImageUtil {

  public static final String TAG = "ImageUtil";

  /**
   * ????,????????
   * 
   * @param bmpOriginal
   *            ?????
   * @return ????????
   */
  public static Bitmap toGrayscale(Bitmap bmpOriginal) {
    int width, height;
    height = bmpOriginal.getHeight();
    width = bmpOriginal.getWidth();

    Bitmap bmpGrayscale = Bitmap
        .createBitmap(width, height, Config.RGB_565);
    Canvas c = new Canvas(bmpGrayscale);
    Paint paint = new Paint();
    ColorMatrix cm = new ColorMatrix();
    cm.setSaturation(0);
    ColorMatrixColorFilter f = new ColorMatrixColorFilter(cm);
    paint.setColorFilter(f);
    c.drawBitmap(bmpOriginal, 0, 0, paint);
    return bmpGrayscale;
  }

  public static Bitmap adjustPhotoRotation(Bitmap bm,
      final int orientationDegree) {

    Matrix m = new Matrix();
    m.setRotate(orientationDegree, (float) bm.getWidth() / 2,
        (float) bm.getHeight() / 2);
    float targetX, targetY;
    if (orientationDegree == 90) {
      targetX = bm.getHeight();
      targetY = 0;
    } else {
      targetX = bm.getHeight();
      targetY = bm.getWidth();
    }

    final float[] values = new float[9];
    m.getValues(values);

    float x1 = values[Matrix.MTRANS_X];
    float y1 = values[Matrix.MTRANS_Y];

    m.postTranslate(targetX - x1, targetY - y1);

    Bitmap bitmap = Bitmap.createBitmap(bm.getHeight(), bm.getWidth(),
        Bitmap.Config.ARGB_8888);
    Paint paint = new Paint();
    Canvas canvas = new Canvas(bitmap);
    canvas.drawBitmap(bm, m, paint);

    return bitmap;
  }

  public Bitmap cutBitmap(Bitmap bitmap) {
    int cut_width;
    int cut_height;
    int cavas_width = 640;// ?????
    int cavas_height = 480;
    int startx = 0;// ??????
    int starty = 0;
    Bitmap resultBitmap = null;
    Matrix cut_matrix = new Matrix();
    if (bitmap.getWidth() > bitmap.getHeight()) {// ?width>height??????????
      cut_width = (bitmap.getHeight() * 4) / 3;
      cut_height = bitmap.getHeight();
      float xb = ((float) cavas_width) / cut_width;
      float yb = ((float) cavas_height) / cut_height;
      cut_matrix.postScale(xb, yb);
      startx = (bitmap.getWidth() - cut_width) / 2;
      resultBitmap = Bitmap.createBitmap(bitmap, startx, starty,
          cut_width, cut_height, cut_matrix, true);
    } else if (bitmap.getWidth() < bitmap.getHeight()) {// ?width <
                              // height??????????
      cut_width = bitmap.getWidth();
      cut_height = (bitmap.getWidth() * 3) / 4;
      float xb = ((float) cavas_width) / cut_width;
      float yb = ((float) cavas_height) / cut_height;
      cut_matrix.postScale(xb, yb);
      starty = (bitmap.getHeight() - cut_height) / 2;
      resultBitmap = Bitmap.createBitmap(bitmap, 0, starty, cut_width,
          cut_height, cut_matrix, true);
    }
    return resultBitmap;
  }

  /**
   * ????
   * 
   * @param angle
   * @param bitmap
   * @return Bitmap
   */
  public static Bitmap rotaingImageView(int angle, Bitmap bitmap) {
    // ???? ??
    Matrix matrix = new Matrix();
    matrix.postRotate(angle);
    // System.out.println("angle2=" + angle);
    // ??????
    try {
      Bitmap resizedBitmap = Bitmap.createBitmap(bitmap, 0, 0,
          bitmap.getWidth(), bitmap.getHeight(), matrix, true);
      return resizedBitmap;
    } catch (OutOfMemoryError ex) {
      ex.printStackTrace();
      return bitmap;
    }

  }

  /**
   * ??????????????
   * 
   * @param path
   *            ???????
   * @return degree?????
   */
  public static int readPictureDegree(String path) {
    int degree = 0;
    try {
      ExifInterface exifInterface = new ExifInterface(path);
      int orientation = exifInterface.getAttributeInt(
          ExifInterface.TAG_ORIENTATION,
          ExifInterface.ORIENTATION_NORMAL);
      switch (orientation) {
      case ExifInterface.ORIENTATION_ROTATE_90:
        degree = 90;
        break;
      case ExifInterface.ORIENTATION_ROTATE_180:
        degree = 180;
        break;
      case ExifInterface.ORIENTATION_ROTATE_270:
        degree = 270;
        break;
      }
    } catch (IOException e) {
      e.printStackTrace();
    }
    return degree;
  }
}
Java Source Code List
