android圖片圓角、圖片去色處理示例

Android中圖片處理

用來對Android中的項目圖片進行處理

代碼如下：

package com.zhanggeng.contact.tools;

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;

/**
 * 處理圖片的工具類.
 *
 */
public class ImageTools {

 /** */
 /**
  * 圖片去色,返回灰度圖片
  *
  * @param bmpOriginal
  *            傳入的圖片
  * @return 去色後的圖片
  */
 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;
 }

 /** */
 /**
  * 去色同時加圓角
  *
  * @param bmpOriginal
  *            原圖
  * @param pixels
  *            圓角弧度
  * @return 修改後的圖片
  */
 public static Bitmap toGrayscale(Bitmap bmpOriginal, int pixels) {
  return toRoundCorner(toGrayscale(bmpOriginal), pixels);
 }

 /** */
 /**
  * 把圖片變成圓角
  *
  * @param bitmap
  *            需要修改的圖片
  * @param pixels
  *            圓角的弧度
  * @return 圓角圖片
  */
 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;
 }

 /** */
 /**
  * 使圓角功能支持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;
 }

 /**
  * 讀取路徑中的圖片，然後將其轉化為縮放後的bitmap
  *
  * @param path
  */
 public static void saveBefore(String path) {
  BitmapFactory.Options options = new BitmapFactory.Options();
  options.inJustDecodeBounds = true;
  // 獲取這個圖片的寬和高
  Bitmap bitmap = BitmapFactory.decodeFile(path, options); // 此時返回bm為空
  options.inJustDecodeBounds = false;
  // 計算縮放比
  int be = (int) (options.outHeight / (float) 200);
  if (be <= 0)
   be = 1;
  options.inSampleSize = 2; // 圖片長寬各縮小二分之一
  // 重新讀入圖片，注意這次要把options.inJustDecodeBounds 設為 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);
 }

 /**
  * 保存圖片為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();
  }
 }

 /**
  * 保存圖片為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();
  }
 }

 /**
  * 圖片合成
  *
  * @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);// 創建一個新的和SRC長度寬度一樣的位圖
  Canvas cv = new Canvas(newb);
  // draw src into
  cv.drawBitmap(src, 0, 0, null);// 在 0，0坐標開始畫入src
  // draw watermark into
  cv.drawBitmap(watermark, w - ww + 5, h - wh + 5, null);// 在src的右下角畫入水印
  // save all clip
  cv.save(Canvas.ALL_SAVE_FLAG);// 保存
  // store
  cv.restore();// 存儲
  return newb;
 }

 // 將圖片轉換成byte[]以便能將其存到數據庫
 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();
 }

 // 得到存儲在數據庫中的圖片
 // 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;
  }
 }
    //將手機中的文件轉換為Bitmap類型
 public static Bitmap getBitemapFromFile(File f) {
  if (!f.exists())
   return null;
  try {
   return BitmapFactory.decodeFile(f.getAbsolutePath());
  } catch (Exception ex) {
   return null;
  }
 }
 //將手機中的文件轉換為Bitmap類型(重載+1)
 public static Bitmap getBitemapFromFile(String fileName) {

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

}