搭配ImageLoader的加水印的工具类

import android.graphics.Bitmap;import android.graphics.Canvas;import android.graphics.Paint;import android.graphics.Typeface;import android.text.Layout;import android.text.StaticLayout;import android.text.TextPaint;import android.util.Log;import com.nostra13.universalimageloader.core.ImageLoader;import com.weijuba.api.utils.FileUtils;import java.io.File;/** * Created by 大灯泡 on 2015/11/13. * 水印工具类(请在异步线程执行本操作) */public class WaterMarkUtils {    public static final int TYPE_PIC = 1;    public static final int TYPE_CHAR = 2;    public static final int POS_LEFT = 11;    public static final int POS_MIDDLE = 20;    public static final int POS_RIGHT = 30;    public static final int POS_TOP = 40;    public static final int POS_BOTTOM = 55;    /**     * 对两个bitmap操作     *     * @param source 原图     * @param mark 水印图     * @param alpha 透明度     * @param posType 相对位置     * @param fileName url，一般传原图的url     */    public static String addWaterMark(Bitmap source, Bitmap mark, int alpha, int posType,        String fileName) {        if (StringUtils.isEmpty(fileName)) fileName = "empty";        return addWaterMark(source, mark, "", alpha, 0, 0, TYPE_PIC, posType, fileName);    }    /**     * 添加文字水印     * @param sourceUrl 原图路径     * @param text 文字     * @param alpha 透明度     * @param color 颜色     * @param textSize 文字大小     * @param posType 相对位置     * @param fileName 文件名，如果是空，则默认赋值为"emtpy"     * @return     */    public static String addCharWaterMark(String sourceUrl, String text, int alpha, int color,        int textSize, int posType, String fileName) {        if (StringUtils.isEmpty(fileName)) fileName = "empty";        return addWaterMark(ImageLoader.getInstance().loadImageSync(sourceUrl), null, text, alpha,            color, textSize, TYPE_CHAR, posType, fileName);    }    /**     * 添加图片水印     * @param sourceUrl 原图url     * @param markUrl 水印图url     * @param alpha 透明度     * @param posType 相对位置     * @return     */    public static String addImageWaterMark(String sourceUrl, String markUrl, int alpha, int posType){        return addWaterMark(ImageLoader.getInstance().loadImageSync(sourceUrl),ImageLoader.getInstance().loadImageSync(markUrl),"",alpha,0,0,TYPE_PIC,posType,sourceUrl);    }    /**     * 添加文字水印     *     * @param source 原图路径     * @param charMark 文字     * @param alpha 透明度     * @param color 颜色     * @param size 文字大小     * @param posType 相对位置     */    public static String addWaterMark(Bitmap source, String charMark, int alpha, int color,        int size, int posType,String fileName) {        if (StringUtils.isEmpty(fileName))            fileName="empty";        return addWaterMark(source, null, charMark, alpha, color, size, TYPE_CHAR, posType, fileName);    }    /**     * 最终方法     * @param source 原图     * @param mark 水印图     * @param charMark 文字     * @param alpha 透明度     * @param color 颜色     * @param size 大小     * @param type 类型     * @param posType 位置     * @param fileName 文件名     */    private static String addWaterMark(Bitmap source, Bitmap mark, String charMark, int alpha,        int color, int size, int type, int posType, String fileName) {        Bitmap outPutBitmap = null;        switch (type) {            case TYPE_PIC:                return addPicMark(source, mark, alpha, posType, fileName);            case TYPE_CHAR:                return addCharMark(source, charMark, alpha, color, size, posType, fileName);            default:                break;        }        return null;    }    /** 添加文字水印 */    private static String addCharMark(Bitmap source, String charMark, int alpha, int color,        int size, int posType, String url) {        if (source == null || source.isRecycled()) return null;        Bitmap outPut = null;        if (StringUtils.notEmpty(charMark)) {            int w = source.getWidth();            int h = source.getHeight();            //样式            String fontType = "宋体";            Typeface font = Typeface.create(fontType, Typeface.NORMAL);            TextPaint textPaint = new TextPaint();            textPaint.setColor(color);            textPaint.setTypeface(font);            textPaint.setTextSize(size);            //换行确定            StaticLayout layout =                new StaticLayout(charMark, textPaint, w, Layout.Alignment.ALIGN_NORMAL, 1.0F, 0.0F,                    true);            try {                //生成与原图大小一致的空画布                outPut = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);                Canvas cv = new Canvas(outPut);                // 在 0，0坐标开始画入src                cv.drawBitmap(source, 0, 0, null);                int markW = layout.getWidth();                int markH = layout.getHeight();                int[] pos = getMarkPos(w, h, markW, markH, posType);                cv.drawText(charMark, pos[0], pos[1], textPaint);                cv.save(Canvas.ALL_SAVE_FLAG);// 保存                cv.restore();// 存储            } catch (OutOfMemoryError error) {                Log.i("OutOfMemoryError", "out of memory, clearing mem cache");                outPut = null;            }        }        return new saveBitmap(outPut, url).getUrl();    }    /** 添加图片水印 */    private static String addPicMark(Bitmap source, Bitmap mark, int alpha, int posType,        String url) {        if (source == null || source.isRecycled()) return null;        Bitmap outPut = null;        int w = source.getWidth();        int h = source.getHeight();        try {            //生成与原图大小一致的空画布            outPut = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);            Canvas cv = new Canvas(outPut);            // 在 0，0坐标开始画入src            cv.drawBitmap(source, 0, 0, null);            Paint paint = new Paint();            //加入图片            if (mark == null || mark.isRecycled()) return null;            int markW = mark.getWidth();            int markH = mark.getHeight();            //需要透明度么。。。。            paint.setAlpha(50);            int pos[] = getMarkPos(w, h, markW, markH, posType);            // 在src的对应位置画入水印            cv.drawBitmap(mark, pos[0], pos[1], paint);            // 保存            cv.save(Canvas.ALL_SAVE_FLAG);            // 存储            cv.restore();        } catch (OutOfMemoryError error) {            Log.i("OutOfMemoryError", "out of memory, clearing mem cache");            outPut = null;        }        return new saveBitmap(outPut, url).getUrl();    }    /** 得到各个位置类型的水印所处的left和top */    private static int[] getMarkPos(int sourceW, int sourceH, int markW, int markH, int posType) {        int[] markPos = new int[2];        //距离边缘n像素        int padding = 10;        if (sourceW > markH && sourceH > markH) {            switch (posType) {                case POS_LEFT:                    //左边(默认左下)                    markPos[0] = 0 + padding;                    markPos[1] = sourceH - padding - markH;                    break;                case POS_LEFT + POS_TOP:                    //左上                    markPos[0] = 0 + padding;                    markPos[1] = 0 + padding;                    break;                case POS_LEFT + POS_MIDDLE:                    //左中                    markPos[0] = 0 + padding;                    markPos[1] = sourceH / 2 - markH / 2;                    break;                case POS_LEFT + POS_BOTTOM:                    //左下                    markPos[0] = 0 + padding;                    markPos[1] = sourceH - padding - markH;                    break;                case POS_MIDDLE:                    //正中                    markPos[0] = sourceW / 2 - markW / 2;                    markPos[1] = sourceH / 2 - markH / 2;                    break;                case POS_MIDDLE + POS_TOP:                    //上中                    markPos[0] = sourceW / 2 - markW / 2;                    markPos[1] = 0 + padding;                    break;                case POS_MIDDLE + POS_BOTTOM:                    //下中                    markPos[0] = sourceW / 2 - markW / 2;                    markPos[1] = sourceH - padding - markH;                    break;                case POS_RIGHT:                    //右（默认右下）                    markPos[0] = sourceW - markW - padding;                    markPos[1] = sourceH - padding - markH;                    break;                case POS_RIGHT + POS_TOP:                    //右上                    markPos[0] = sourceW - markW - padding;                    markPos[1] = 0 + padding;                    break;                case POS_RIGHT + POS_MIDDLE:                    //右中                    markPos[0] = sourceW - markW - padding;                    markPos[1] = sourceH / 2 - markH / 2;                    break;                case POS_RIGHT + POS_BOTTOM:                    //右下                    markPos[0] = sourceW - markW - padding;                    markPos[1] = sourceH - padding - markH;                    break;                default:                    break;            }        }        return markPos;    }    /** 保存bitmap到本地 */    static class saveBitmap {        Bitmap mBitmap;        private String path = "";        private Runnable mRunnable;        private String name;        public saveBitmap(Bitmap bitmap, String name) {            mBitmap = bitmap;            this.name = name;        }        public String getUrl() {            if (StringUtils.notEmpty(name)) {                this.name = MD5Tools.MD5(name);            }            File file = new File(FileUtils.getWaterMarkImagePath() + name + ".jpg");            if (!file.exists()) {                if (mBitmap != null && !mBitmap.isRecycled()) {                    FileUtils.saveBitmapToSD(FileUtils.getWaterMarkImagePath() + name + ".jpg",                        mBitmap);                    path = FileUtils.getWaterMarkImagePath() + name + ".jpg";                }            } else {                path = FileUtils.getWaterMarkImagePath() + name + ".jpg";            }            return path;        }    }} 

调用很简单，只需要调用那几个static方法即可。

另外，最后那个saveBitmap那里的几个路径需要针对自己的工程进行修改