[移动开发]Android图片添加水印

最终效果

参考https://github.com/echoMu/WaterMaskDemohttps://github.com/echoMu/WaterMaskDemo

首先要自定义左下角的view

WaterMaskView

import android.content.Context;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.widget.RelativeLayout;
import android.widget.TextView;
import com.enneagon.net.R;


/**
 * 自定义水印view
 */
public class WaterMaskView extends RelativeLayout {

    private TextView tv_date;
    private TextView tv_stationName;
    private TextView tv_long;
    private TextView tv_lat;
    private TextView tv_address;

    private TextView tv_date2;
    private TextView tv_stationName2;
    private TextView tv_long2;
    private TextView tv_lat2;
    private TextView tv_address2;


    public WaterMaskView(Context context) {
        this(context, null);
    }

    public WaterMaskView(Context context, AttributeSet attrs) {
        super(context, attrs);
        LayoutInflater.from(context).inflate(R.layout.layout_watermask, this, true);
        tv_date = (TextView) findViewById(R.id.tv_date);
        tv_stationName = (TextView) findViewById(R.id.tv_stationName);
        tv_long = (TextView) findViewById(R.id.tv_long);
        tv_lat = (TextView) findViewById(R.id.tv_lat);
        tv_address = (TextView) findViewById(R.id.tv_address);

        tv_date2 = (TextView) findViewById(R.id.tv_date2);
        tv_stationName2 = (TextView) findViewById(R.id.tv_stationName2);
        tv_long2 = (TextView) findViewById(R.id.tv_long2);
        tv_lat2 = (TextView) findViewById(R.id.tv_lat2);
        tv_address2 = (TextView) findViewById(R.id.tv_address2);

    }

    public void setInfoDate(String content) {
        tv_date.setText(content);
        tv_date2.setText(content);
    }

    public void setInfoAddress(String content) {
        tv_address.setText(content);
        tv_address2.setText(content);
    }

    public void setInfoLat(String content) {
        tv_lat.setText(content);
        tv_lat2.setText(content);
    }

    public void setInfoLon(String content) {
        tv_long.setText(content);
        tv_long2.setText(content);
    }

    public void setInfoStationName(String content) {
        tv_stationName.setText(content);
        tv_stationName2.setText(content);
    }

}

layout_watermask.xml

import android.content.Context;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.widget.RelativeLayout;
import android.widget.TextView;
import com.enneagon.net.R;


/**
 * 自定义水印view
 */
public class WaterMaskView extends RelativeLayout {

    private TextView tv_date;
    private TextView tv_stationName;
    private TextView tv_long;
    private TextView tv_lat;
    private TextView tv_address;

    private TextView tv_date2;
    private TextView tv_stationName2;
    private TextView tv_long2;
    private TextView tv_lat2;
    private TextView tv_address2;


    public WaterMaskView(Context context) {
        this(context, null);
    }

    public WaterMaskView(Context context, AttributeSet attrs) {
        super(context, attrs);
        LayoutInflater.from(context).inflate(R.layout.layout_watermask, this, true);
        tv_date = (TextView) findViewById(R.id.tv_date);
        tv_stationName = (TextView) findViewById(R.id.tv_stationName);
        tv_long = (TextView) findViewById(R.id.tv_long);
        tv_lat = (TextView) findViewById(R.id.tv_lat);
        tv_address = (TextView) findViewById(R.id.tv_address);

        tv_date2 = (TextView) findViewById(R.id.tv_date2);
        tv_stationName2 = (TextView) findViewById(R.id.tv_stationName2);
        tv_long2 = (TextView) findViewById(R.id.tv_long2);
        tv_lat2 = (TextView) findViewById(R.id.tv_lat2);
        tv_address2 = (TextView) findViewById(R.id.tv_address2);

    }

    public void setInfoDate(String content) {
        tv_date.setText(content);
        tv_date2.setText(content);
    }

    public void setInfoAddress(String content) {
        tv_address.setText(content);
        tv_address2.setText(content);
    }

    public void setInfoLat(String content) {
        tv_lat.setText(content);
        tv_lat2.setText(content);
    }

    public void setInfoLon(String content) {
        tv_long.setText(content);
        tv_long2.setText(content);
    }

    public void setInfoStationName(String content) {
        tv_stationName.setText(content);
        tv_stationName2.setText(content);
    }

}

接着是水印工具类

WaterMaskUtil

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.Rect;
import android.view.View;

/**
 * <pre>
 *     author : echoMu
 *     e-mail :
 *     time   : 2017/07/12
 *     desc   :
 *     version:
 * </pre>
 */
public class WaterMaskUtil {
    /**
     * 设置水印图片在左上角
     * @param src
     * @param watermark
     * @param paddingLeft
     * @param paddingTop
     * @return
     */
    public static Bitmap createWaterMaskLeftTop(
            Context context, Bitmap src, Bitmap watermark,
            int paddingLeft, int paddingTop) {
        return createWaterMaskBitmap(src, watermark,
                dp2px(context, paddingLeft), dp2px(context, paddingTop));
    }

    /**
     * 设置水印图片在右下角
     * @param src
     * @param watermark
     * @param paddingRight
     * @param paddingBottom
     * @return
     */
    public static Bitmap createWaterMaskRightBottom(
            Context context, Bitmap src, Bitmap watermark,
            int paddingRight, int paddingBottom) {
        return createWaterMaskBitmap(src, watermark,
                src.getWidth() - watermark.getWidth() - dp2px(context, paddingRight),
                src.getHeight() - watermark.getHeight() - dp2px(context, paddingBottom));
    }

    /**
     * 设置水印图片到右上角
     * @param src
     * @param watermark
     * @param paddingRight
     * @param paddingTop
     * @return
     */
    public static Bitmap createWaterMaskRightTop(
            Context context, Bitmap src, Bitmap watermark,
            int paddingRight, int paddingTop) {
        return createWaterMaskBitmap( src, watermark,
                src.getWidth() - watermark.getWidth() - dp2px(context, paddingRight),
                dp2px(context, paddingTop));
    }

    /**
     * 设置水印图片到左下角
     * @param src
     * @param watermark
     * @param paddingLeft
     * @param paddingBottom
     * @return
     */
    public static Bitmap createWaterMaskLeftBottom(
            Context context, Bitmap src, Bitmap watermark,
            int paddingLeft, int paddingBottom) {
        return createWaterMaskBitmap(src, watermark, dp2px(context, paddingLeft),
                src.getHeight() - watermark.getHeight() - dp2px(context, paddingBottom));
    }

    /**
     * 设置水印图片到中间
     * @param src
     * @param watermark
     * @return
     */
    public static Bitmap createWaterMaskCenter(Bitmap src, Bitmap watermark) {
        return createWaterMaskBitmap(src, watermark,
                (src.getWidth() - watermark.getWidth()) / 2,
                (src.getHeight() - watermark.getHeight()) / 2);
    }

    /**
     * 绘制水印图片
     * @param src 原图
     * @param watermark 水印
     * @param paddingLeft
     * @param paddingTop
     * @return
     */
    private static Bitmap createWaterMaskBitmap(Bitmap src, Bitmap watermark,
                                                int paddingLeft, int paddingTop) {
        if (src == null) {
            return null;
        }
        int width = src.getWidth();
        int height = src.getHeight();
        //创建一个bitmap
        Bitmap newb = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);// 创建一个新的和SRC长度宽度一样的位图
        //将该图片作为画布
        Canvas canvas = new Canvas(newb);
        //在画布 0，0坐标上开始绘制原始图片
        canvas.drawBitmap(src, 0, 0, null);
        //在画布上绘制水印图片
        canvas.drawBitmap(watermark, paddingLeft, paddingTop, null);
        // 保存
        canvas.save();
//        canvas.save(Canvas.ALL_SAVE_FLAG);
        // 存储
        canvas.restore();
        return newb;
    }

    /**
     * 给图片添加文字到左上角
     * @param context
     * @param bitmap
     * @param text
     * @return
     */
    public static Bitmap drawTextToLeftTop(Context context, Bitmap bitmap, String text,
                                           int size, int color, int paddingLeft, int paddingTop) {
        Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
        paint.setColor(color);
        paint.setTextSize(dp2px(context, size));
        Rect bounds = new Rect();
        paint.getTextBounds(text, 0, text.length(), bounds);
        return drawTextToBitmap(context, bitmap, text, paint, bounds,
                dp2px(context, paddingLeft),
                dp2px(context, paddingTop) + bounds.height());
    }

    /**
     * 绘制文字到右下角
     * @param context
     * @param bitmap
     * @param text
     * @param size
     * @param color
     * @param paddingRight
     * @param paddingBottom
     * @return
     */
    public static Bitmap drawTextToRightBottom(Context context, Bitmap bitmap, String text,
                                               int size, int color, int paddingRight, int paddingBottom) {
        Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
        paint.setColor(color);
        paint.setTextSize(dp2px(context, size));
        Rect bounds = new Rect();
        paint.getTextBounds(text, 0, text.length(), bounds);
        return drawTextToBitmap(context, bitmap, text, paint, bounds,
                bitmap.getWidth() - bounds.width() - dp2px(context, paddingRight),
                bitmap.getHeight() - dp2px(context, paddingBottom));
    }

    /**
     * 绘制文字到右上方
     * @param context
     * @param bitmap
     * @param text
     * @param size
     * @param color
     * @param paddingRight
     * @param paddingTop
     * @return
     */
    public static Bitmap drawTextToRightTop(Context context, Bitmap bitmap, String text,
                                            int size, int color, int paddingRight, int paddingTop) {
        Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
        paint.setColor(color);
        paint.setTextSize(dp2px(context, size));
        Rect bounds = new Rect();
        paint.getTextBounds(text, 0, text.length(), bounds);
        return drawTextToBitmap(context, bitmap, text, paint, bounds,
                bitmap.getWidth() - bounds.width() - dp2px(context, paddingRight),
                dp2px(context, paddingTop) + bounds.height());
    }

    /**
     * 绘制文字到左下方
     * @param context
     * @param bitmap
     * @param text
     * @param size
     * @param color
     * @param paddingLeft
     * @param paddingBottom
     * @return
     */
    public static Bitmap drawTextToLeftBottom(Context context, Bitmap bitmap, String text,
                                              int size, int color, int paddingLeft, int paddingBottom) {
        Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
        paint.setColor(color);
        paint.setTextSize(dp2px(context, size));
        Rect bounds = new Rect();
        paint.getTextBounds(text, 0, text.length(), bounds);
        return drawTextToBitmap(context, bitmap, text, paint, bounds,
                dp2px(context, paddingLeft),
                bitmap.getHeight() - dp2px(context, paddingBottom+2));
    }

    /**
     * 绘制文字到中间
     * @param context
     * @param bitmap
     * @param text
     * @param size
     * @param color
     * @return
     */
    public static Bitmap drawTextToCenter(Context context, Bitmap bitmap, String text,
                                          int size, int color) {
        Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
        paint.setColor(color);
        paint.setTextSize(dp2px(context, size));
        Rect bounds = new Rect();
        paint.getTextBounds(text, 0, text.length(), bounds);
        return drawTextToBitmap(context, bitmap, text, paint, bounds,
                (bitmap.getWidth() - bounds.width()) / 2,
                (bitmap.getHeight() + bounds.height()) / 2);
    }

    //图片上绘制文字
    private static Bitmap drawTextToBitmap(Context context, Bitmap bitmap, String text,
                                           Paint paint, Rect bounds, int paddingLeft, int paddingTop) {
        Bitmap.Config bitmapConfig = bitmap.getConfig();

        paint.setDither(true); // 获取跟清晰的图像采样
        paint.setFilterBitmap(true);// 过滤一些
        if (bitmapConfig == null) {
            bitmapConfig = Bitmap.Config.ARGB_8888;
        }
        bitmap = bitmap.copy(bitmapConfig, true);
        Canvas canvas = new Canvas(bitmap);

//        canvas.drawText(text, paddingLeft, paddingTop, paint);
        drawMultiLineText(text, paddingLeft, paddingTop, paint,canvas);
        return bitmap;
    }

    private static void drawMultiLineText(String str, float x, float y, Paint paint,
                                          Canvas canvas) {
        String[] lines = str.split("\n");
        float txtSize = -paint.ascent() + paint.descent();

        if (paint.getStyle() == Paint.Style.FILL_AND_STROKE
                || paint.getStyle() == Paint.Style.STROKE) {
            txtSize += paint.getStrokeWidth(); // add stroke width to the text
        }
        float lineSpace = txtSize * 0.1f; // default line spacing
        for (int i = 0; i < lines.length; ++i) {
            canvas.drawText(lines[i], x, y + (txtSize + lineSpace) * i, paint);
        }
    }

    /**
     * 缩放图片
     * @param src
     * @param w
     * @param h
     * @return
     */
    public static Bitmap scaleWithWH(Bitmap src, double w, double h) {
        if (w == 0 || h == 0 || src == null) {
            return src;
        } else {
            // 记录src的宽高
            int width = src.getWidth();
            int height = src.getHeight();
            // 创建一个matrix容器
            Matrix matrix = new Matrix();
            // 计算缩放比例
            float scaleWidth = (float) (w / width);
            float scaleHeight = (float) (h / height);
            // 开始缩放
            matrix.postScale(scaleWidth, scaleHeight);
            // 创建缩放后的图片
            return Bitmap.createBitmap(src, 0, 0, width, height, matrix, true);
        }
    }

    /**
     * dip转pix
     * @param context
     * @param dp
     * @return
     */
    public static int dp2px(Context context, float dp) {
        final float scale = context.getResources().getDisplayMetrics().density;
        return (int) (dp * scale + 0.5f);
    }

    /**
     * 将一个view转换为Bitmap
     * @param view
     * @return
     */
    public static Bitmap convertViewToBitmap(View view){
        view.measure(View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED), View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));
        view.layout(0, 0, view.getMeasuredWidth(), view.getMeasuredHeight());
        view.buildDrawingCache();
        Bitmap bitmap = view.getDrawingCache();
        return bitmap;
    }

    /**
     * 缩放Bitmap图片
     *
     */
    public static Bitmap zoomBitmap(Bitmap bitmap, int width, int height) {

        int w = bitmap.getWidth();
        int h = bitmap.getHeight();
        Matrix matrix = new Matrix();
        float scaleWidth = ((float) width / w);
        float scaleHeight = ((float) height / h);
        matrix.postScale(scaleWidth, scaleHeight);// 利用矩阵进行缩放不会造成内存溢出
        Bitmap newbmp = Bitmap.createBitmap(bitmap, 0, 0, w, h, matrix, true);

        return newbmp;
    }

}

使用方式：

1、获取图片的URL，然后转成bitmap

  Bitmap sourBitmap = BitmapFactory.decodeFile(fileUrl);

2、添加水印，并转为Bitmap

//默认设置水印位置在左下
Bitmap WaterBitmap = saveWaterMask(context, 3, sourBitmap,lng, lat, address, stationName);

    /**
     * @param position 左上为0，顺时针算起
     */
    private static Bitmap saveWaterMask(Context context, int position, Bitmap sourBitmap,String lng, String lat, String address, String stationName) {
        WaterMaskView waterMaskView = new WaterMaskView(context);
        RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
        waterMaskView.setLayoutParams(params);
//        waterMaskView.setCompanyText(address);
//        waterMaskView.setInfoText(stationName);
        String time = TimeUtils.getCurrentTimeInString();
        waterMaskView.setInfoDate(time);
        waterMaskView.setInfoAddress(address);
        waterMaskView.setInfoLat(lat);
        waterMaskView.setInfoLon(lng);
        waterMaskView.setInfoStationName(stationName);

        Bitmap waterBitmap = WaterMaskUtil.convertViewToBitmap(waterMaskView);

        //根据原图处理要生成的水印的宽高
        float width = sourBitmap.getWidth();
        float height = sourBitmap.getHeight();
        float be = width / height;

        if ((float) 16 / 9 >= be && be >= (float) 4 / 3) {
            //在图片比例区间内16;9~4：3内，将生成的水印bitmap设置为原图宽高各自的1/5
            waterBitmap = WaterMaskUtil.zoomBitmap(waterBitmap, (int) width / 5, (int) height / 5);
        } else if (be > (float) 16 / 9) {
            //生成4：3的水印
            waterBitmap = WaterMaskUtil.zoomBitmap(waterBitmap, (int) width / 5, (int) width * 3 / 20);
        } else if (be < (float) 4 / 3) {
            //生成4：3的水印
            waterBitmap = WaterMaskUtil.zoomBitmap(waterBitmap, (int) height * 4 / 15, (int) height / 5);
        }
        Bitmap watermarkBitmap = null;
        switch (position) {
            case 0:
                watermarkBitmap = WaterMaskUtil.createWaterMaskLeftTop(context, sourBitmap, waterBitmap, 0, 0);
                break;
            case 1:
                watermarkBitmap = WaterMaskUtil.createWaterMaskRightTop(context, sourBitmap, waterBitmap, 0, 0);
                break;
            case 2:
                watermarkBitmap = WaterMaskUtil.createWaterMaskRightBottom(context, sourBitmap, waterBitmap, 0, 0);
                break;
            case 3:
                watermarkBitmap = WaterMaskUtil.createWaterMaskLeftBottom(context, sourBitmap, waterBitmap, 0, 0);
                break;
        }
        return watermarkBitmap;

    }

3、将Bitmap保存到手机，获取文件URL，最后将文件上传到服务器

//保存图片
String fileName = "IMG_" + new Date().getTime() + RandomUtil.getRandom(10000) + ".png";
String targetFileUrl = saveBitmap(context, WaterBitmap, fileName);

private static String saveBitmap(Context context, Bitmap mBitmap, String name) {

        String appName = context.getResources().getString(R.string.app_name);

        String folder = Environment.getExternalStorageDirectory()
                + File.separator + appName + File.separator + "photo";

        LogUtils.i("folder=" + folder);

        File folderFile = new File(folder);

        if (!folderFile.exists()) {
            boolean isSuccess = folderFile.mkdirs();
            LogUtils.i("创建文件夹路径是否成功=" + isSuccess);
        }

        String target = folder + File.separator + name;
        LogUtils.i("target=" + target);

        File targetFile = new File(target);

        try {
            targetFile.createNewFile();
        } catch (IOException e) {
            LogUtils.e("在保存图片时出错：" + e.toString());
        }

        FileOutputStream fOut = null;
        try {
            fOut = new FileOutputStream(targetFile);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        mBitmap.compress(Bitmap.CompressFormat.PNG, 100, fOut);
        try {
            fOut.flush();
        } catch (IOException e) {
            e.printStackTrace();
        }
        try {
            fOut.close();
        } catch (IOException e) {
            e.printStackTrace();
        }

        return target;
    }