ImageUtils.java

/**
 * 创建人：SongZhiyong
 * 创建时间：2013-1-14
 */
package com.jerome.utils.media;

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

import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.ColorMatrix;
import android.graphics.ColorMatrixColorFilter;
import android.graphics.Paint;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.Bitmap.Config;
import android.graphics.PorterDuff.Mode;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;

/**
 * 处理图片的工具类.
 * 
 * @author Terry_龙 --借鉴
 *         http://www.cnblogs.com/TerryBlog/archive/2012/01/08/2316482.html
 */
public class ImageUtils {
	public static final int LEFT = 0;
	public static final int RIGHT = 1;
	public static final int TOP = 3;
	public static final int BOTTOM = 4;

	/** */
	/**
	 * 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(Resources resources,
			BitmapDrawable bitmapDrawable, int pixels) {
		Bitmap bitmap = bitmapDrawable.getBitmap();
		bitmapDrawable = new BitmapDrawable(resources, 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();
		}
	}

	/**
	 * 水印
	 * 
	 * @param bitmap
	 * @return
	 */
	public static Bitmap createBitmapForWatermark(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;
	}

	/**
	 * 图片合成
	 * 
	 * @return
	 */
	public static Bitmap potoMix(int direction, Bitmap... bitmaps) {
		if (bitmaps.length <= 0) {
			return null;
		}
		if (bitmaps.length == 1) {
			return bitmaps[0];
		}
		Bitmap newBitmap = bitmaps[0];
		// newBitmap = createBitmapForFotoMix(bitmaps[0],bitmaps[1],direction);
		for (int i = 1; i < bitmaps.length; i++) {
			newBitmap = createBitmapForFotoMix(newBitmap, bitmaps[i], direction);
		}
		return newBitmap;
	}

	private static Bitmap createBitmapForFotoMix(Bitmap first, Bitmap second,
			int direction) {
		if (first == null) {
			return null;
		}
		if (second == null) {
			return first;
		}
		int fw = first.getWidth();
		int fh = first.getHeight();
		int sw = second.getWidth();
		int sh = second.getHeight();
		Bitmap newBitmap = null;
		if (direction == LEFT) {
			newBitmap = Bitmap.createBitmap(fw + sw, fh > sh ? fh : sh,
					Config.ARGB_8888);
			Canvas canvas = new Canvas(newBitmap);
			canvas.drawBitmap(first, sw, 0, null);
			canvas.drawBitmap(second, 0, 0, null);
		} else if (direction == RIGHT) {
			newBitmap = Bitmap.createBitmap(fw + sw, fh > sh ? fh : sh,
					Config.ARGB_8888);
			Canvas canvas = new Canvas(newBitmap);
			canvas.drawBitmap(first, 0, 0, null);
			canvas.drawBitmap(second, fw, 0, null);
		} else if (direction == TOP) {
			newBitmap = Bitmap.createBitmap(sw > fw ? sw : fw, fh + sh,
					Config.ARGB_8888);
			Canvas canvas = new Canvas(newBitmap);
			canvas.drawBitmap(first, 0, sh, null);
			canvas.drawBitmap(second, 0, 0, null);
		} else if (direction == BOTTOM) {
			newBitmap = Bitmap.createBitmap(sw > fw ? sw : fw, fh + sh,
					Config.ARGB_8888);
			Canvas canvas = new Canvas(newBitmap);
			canvas.drawBitmap(first, 0, 0, null);
			canvas.drawBitmap(second, 0, fh, null);
		}
		return newBitmap;
	}

	/**
	 * 将Bitmap转换成指定大小
	 * 
	 * @param bitmap
	 * @param width
	 * @param height
	 * @return
	 */
	public static Bitmap createBitmapBySize(Bitmap bitmap, int width, int height) {
		return Bitmap.createScaledBitmap(bitmap, width, height, true);
	}

	/**
	 * Drawable 转 Bitmap
	 * 
	 * @param drawable
	 * @return
	 */
	public static Bitmap drawableToBitmapByBD(Drawable drawable) {
		BitmapDrawable bitmapDrawable = (BitmapDrawable) drawable;
		return bitmapDrawable.getBitmap();
	}

	/**
	 * Bitmap 转 Drawable
	 * 
	 * @param bitmap
	 * @return
	 */
	public static Drawable bitmapToDrawableByBD(Resources resources,
			Bitmap bitmap) {
		Drawable drawable = new BitmapDrawable(resources, bitmap);
		return drawable;
	}

	/**
	 * byte[] 转 bitmap
	 * 
	 * @param b
	 * @return
	 */
	public static Bitmap bytesToBimap(byte[] b) {
		if (b.length != 0) {
			return BitmapFactory.decodeByteArray(b, 0, b.length);
		} else {
			return null;
		}
	}

	/**
	 * bitmap 转 byte[]
	 * 
	 * @param bm
	 * @return
	 */
	public static byte[] bitmapToBytes(Bitmap bm) {
		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		bm.compress(Bitmap.CompressFormat.PNG, 100, baos);
		return baos.toByteArray();
	}
}