android图片圆角、图片去色处理示例

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

import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.ColorMatrix;
import android.graphics.ColorMatrixColorFilter;
import android.graphics.Paint;
import android.graphics.PorterDuff.Mode;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.drawable.BitmapDrawable;
import android.view.ViewGroup;
import android.view.animation.AccelerateInterpolator;

/**
 * 处理图片的工具类.
 *
 */
public class ImageTools {

 /** */
 /**
  * 图片去色,返回灰度图片
  *
  * @param bmpOriginal
  *            传入的图片
  * @return 去色后的图片
  */
 public static Bitmap toGrayscale(Bitmap bmpOriginal) {
  int width, height;
  height = bmpOriginal.getHeight();
  width = bmpOriginal.getWidth();
  Bitmap bmpGrayscale = Bitmap.createBitmap(width, height,
    Bitmap.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;
 }

 /** */
 /**
  * 去色同时加圆角
  *
  * @param bmpOriginal
  *            原图
  * @param pixels
  *            圆角弧度
  * @return 修改后的图片
  */
 public static Bitmap toGrayscale(Bitmap bmpOriginal, int pixels) {
  return toRoundCorner(toGrayscale(bmpOriginal), pixels);
 }

 /** */
 /**
  * 把图片变成圆角
  *
  * @param bitmap
  *            需要修改的图片
  * @param pixels
  *            圆角的弧度
  * @return 圆角图片
  */
 public static Bitmap toRoundCorner(Bitmap bitmap, int pixels) {

  Bitmap output = Bitmap.createBitmap(bitmap.getWidth(),
    bitmap.getHeight(), Config.ARGB_8888);
  Canvas canvas = new Canvas(output);

  final int color = 0xff424242;
  final Paint paint = new Paint();
  final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
  final RectF rectF = new RectF(rect);
  final float roundPx = pixels;

  paint.setAntiAlias(true);
  canvas.drawARGB(0, 0, 0, 0);
  paint.setColor(color);
  canvas.drawRoundRect(rectF, roundPx, roundPx, paint);

  paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
  canvas.drawBitmap(bitmap, rect, rect, paint);

  return output;
 }

 /** */
 /**
  * 使圆角功能支持BitampDrawable
  *
  * @param bitmapDrawable
  * @param pixels
  * @return
  */
 public static BitmapDrawable toRoundCorner(BitmapDrawable bitmapDrawable,
   int pixels) {
  Bitmap bitmap = bitmapDrawable.getBitmap();
  bitmapDrawable = new BitmapDrawable(toRoundCorner(bitmap, pixels));
  return bitmapDrawable;
 }

 /**
  * 读取路径中的图片，然后将其转化为缩放后的bitmap
  *
  * @param path
  */
 public static void saveBefore(String path) {
  BitmapFactory.Options options = new BitmapFactory.Options();
  options.inJustDecodeBounds = true;
  // 获取这个图片的宽和高
  Bitmap bitmap = BitmapFactory.decodeFile(path, options); // 此时返回bm为空
  options.inJustDecodeBounds = false;
  // 计算缩放比
  int be = (int) (options.outHeight / (float) 200);
  if (be <= 0)
   be = 1;
  options.inSampleSize = 2; // 图片长宽各缩小二分之一
  // 重新读入图片，注意这次要把options.inJustDecodeBounds 设为 false哦
  bitmap = BitmapFactory.decodeFile(path, options);
  int w = bitmap.getWidth();
  int h = bitmap.getHeight();
  System.out.println(w + "   " + h);
  // savePNG_After(bitmap,path);
  saveJPGE_After(bitmap, path);
 }

 /**
  * 保存图片为PNG
  *
  * @param bitmap
  * @param name
  */
 public static void savePNG_After(Bitmap bitmap, String name) {
  File file = new File(name);
  try {
   FileOutputStream out = new FileOutputStream(file);
   if (bitmap.compress(Bitmap.CompressFormat.PNG, 100, out)) {
    out.flush();
    out.close();
   }
  } catch (FileNotFoundException e) {
   e.printStackTrace();
  } catch (IOException e) {
   e.printStackTrace();
  }
 }

 /**
  * 保存图片为JPEG
  *
  * @param bitmap
  * @param path
  */
 public static void saveJPGE_After(Bitmap bitmap, String path) {
  File file = new File(path);
  try {
   FileOutputStream out = new FileOutputStream(file);
   if (bitmap.compress(Bitmap.CompressFormat.JPEG, 100, out)) {
    out.flush();
    out.close();
   }
  } catch (FileNotFoundException e) {
   e.printStackTrace();
  } catch (IOException e) {
   e.printStackTrace();
  }
 }

 /**
  * 图片合成
  *
  * @param bitmap
  * @return
  */
 private Bitmap createBitmap(Bitmap src, Bitmap watermark) {
  if (src == null) {
   return null;
  }
  int w = src.getWidth();
  int h = src.getHeight();
  int ww = watermark.getWidth();
  int wh = watermark.getHeight();
  // create the new blank bitmap
  Bitmap newb = Bitmap.createBitmap(w, h, Config.ARGB_8888);// 创建一个新的和SRC长度宽度一样的位图
  Canvas cv = new Canvas(newb);
  // draw src into
  cv.drawBitmap(src, 0, 0, null);// 在 0，0坐标开始画入src
  // draw watermark into
  cv.drawBitmap(watermark, w - ww + 5, h - wh + 5, null);// 在src的右下角画入水印
  // save all clip
  cv.save(Canvas.ALL_SAVE_FLAG);// 保存
  // store
  cv.restore();// 存储
  return newb;
 }

 // 将图片转换成byte[]以便能将其存到数据库
 public static byte[] getByteFromBitmap(Bitmap bitmap) {
  ByteArrayOutputStream out = new ByteArrayOutputStream();
  bitmap.compress(Bitmap.CompressFormat.JPEG, 100, out);
  try {
   out.flush();
   out.close();
  } catch (IOException e) {
   e.printStackTrace();
   // Log.e(TAG, "transform byte exception");
  }
  return out.toByteArray();
 }

 // 得到存储在数据库中的图片
 // eg imageView.setImageBitmap(bitmapobj);
 public static Bitmap getBitmapFromByte(byte[] temp) {
  if (temp != null) {
   Bitmap bitmap = BitmapFactory.decodeByteArray(temp, 0, temp.length);
   return bitmap;
  } else {
   // Bitmap bitmap=BitmapFactory.decodeResource(getResources(),
   // R.drawable.contact_add_icon);
   return null;
  }
 }
    //将手机中的文件转换为Bitmap类型
 public static Bitmap getBitemapFromFile(File f) {
  if (!f.exists())
   return null;
  try {
   return BitmapFactory.decodeFile(f.getAbsolutePath());
  } catch (Exception ex) {
   return null;
  }
 }
 //将手机中的文件转换为Bitmap类型(重载+1)
 public static Bitmap getBitemapFromFile(String fileName) {

  try {
   return BitmapFactory.decodeFile(fileName);
  } catch (Exception ex) {
   return null;
  }
 }

}