Android 为图片添加文字水印

先上图：

上代码

------------------------MainActivity------------------------

package com.example.zhuoshi.watermarkdemo;import android.graphics.Bitmap;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageView;
import android.widget.Toast;
/*** Author: baipenggui* Date: 2019/1/23 16:06* Email: 1528354213@qq.com* Description: 在Activity中进行图片展示,以及图片保存*/
public class MainActivity extends AppCompatActivity {private static String filePath = Environment.getExternalStorageDirectory() + "/WatermarkPicture/";@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);String photoAddress = "海淀区-清河路-西三旗桥";String phoneDate = "2019-01-22";String illicitCode = "1008";String illicitBehavior = "闯红灯";String equipmentNumber = "fgf54327d";String antifakeInformation = "*#4%6&*@";ImageView imageView = findViewById(R.id.image);int resource = R.drawable.girl;WatermarkSettings.getmInstance(this);Bitmap bitmap = WatermarkSettings.createWatermark(resource, photoAddress, phoneDate, illicitCode, illicitBehavior, equipmentNumber, antifakeInformation);imageView.setImageBitmap(bitmap);//保存图片imageView.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {WatermarkSettings.savaWaterparkFile(filePath);Toast.makeText(MainActivity.this, "您点击了图片,已保存", Toast.LENGTH_SHORT).show();}});}
}

------------------------WatermarkSettings------------------------

package com.example.zhuoshi.watermarkdemo;import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Rect;
import android.text.Layout;
import android.text.StaticLayout;
import android.text.TextPaint;
import android.text.TextUtils;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.WindowManager;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
/*** Author: baipenggui* Date: 2019/1/23 16:06* Email: 1528354213@qq.com* Description: 形成水印工具类*/
public class WatermarkSettings {public static WatermarkSettings mInstance;public static Context mContext;public static int mResources;private static String watermarkText;private static String mPhotoGraphed;private static String mPhotoDate;private static String mIllicitCode;private static String mIllicitBehavior;private static String mEquipmentNumber;private static String mAntifakeInformation;private static String TAG = "";/**@Description: 图片添加水印的信息*@Params:*@Author: baipenggui*@Date: 2019/1/23*/public static WatermarkSettings getmInstance(Context context) {mContext = context;if (mInstance == null) {mInstance = new WatermarkSettings();}TAG = mContext.getClass().getName();return mInstance;}/*** @Description 创建水印文件,以下是水印上添加的文本信息* @param resources 需要添加水印的图片资源* @param photoGraphed 拍照地点* @param photoDate 拍照时间* @param illicitCode 违法代码* @param illicitBehavior 违法行为* @param equipmentNumber 设备编号* @param antifakeInformation 防伪信息* @return*/public static Bitmap createWatermark(int resources, String photoGraphed, String photoDate,String illicitCode, String illicitBehavior, String equipmentNumber, String antifakeInformation) {mResources = resources;mPhotoGraphed = photoGraphed;mPhotoDate = photoDate;mIllicitCode = illicitCode;mIllicitBehavior =  illicitBehavior;mEquipmentNumber = equipmentNumber;mAntifakeInformation = antifakeInformation;Bitmap bitmap = BitmapFactory.decodeResource(mContext.getResources(), resources);// 获取图片的宽高int bitmapWidth = bitmap.getWidth();int bitmapHeight = bitmap.getHeight();// 创建一个和图片一样大的背景图Bitmap bmp = Bitmap.createBitmap(bitmapWidth, bitmapHeight, Bitmap.Config.ARGB_8888);Canvas canvas = new Canvas(bmp);// 画背景图canvas.drawBitmap(bitmap, 0, 0, null);watermarkText = "违法时间:" + photoDate + "\n违法地点:" + photoGraphed + "\n违法代码:" + illicitCode + "\n违法行为:" + illicitBehavior + "\n设备编号:" + equipmentNumber + "\n防伪信息:" + antifakeInformation;//-------------开始绘制文字--------------if (!TextUtils.isEmpty(watermarkText)) {int screenWidth = getScreenWidth();float textSize = dp2px(mContext, 16) * bitmapWidth / screenWidth;// 创建画笔TextPaint mPaint = new TextPaint();// 文字矩阵区域Rect textBounds = new Rect();// 水印的字体大小mPaint.setTextSize(textSize);// 文字阴影mPaint.setShadowLayer(0.5f, 0f, 1f, Color.YELLOW);// 抗锯齿mPaint.setAntiAlias(true);// 水印的区域mPaint.getTextBounds(watermarkText, 0, watermarkText.length(), textBounds);// 水印的颜色mPaint.setColor(Color.BLUE);StaticLayout layout = new StaticLayout(watermarkText, 0, watermarkText.length(), mPaint, (int) (bitmapWidth - textSize),Layout.Alignment.ALIGN_NORMAL, 1.0F, 0.5F, true);// 文字开始的坐标float textX = dp2px(mContext, 8) * bitmapWidth / screenWidth;//float textY = bitmapHeight / 2;//图片的中间float textY = dp2px(mContext, 8) * bitmapHeight / screenWidth;// 画文字canvas.translate(textX, textY);layout.draw(canvas);}//保存所有元素canvas.save();canvas.restore();return bmp;}/*** @Description 保存水印图片* @param saveWatermarkPath 保存路径*/public static void savaWaterparkFile(String saveWatermarkPath) {Bitmap watermark = createWatermark(mResources,mPhotoGraphed,mPhotoDate,mIllicitCode,mIllicitBehavior,mEquipmentNumber,mAntifakeInformation);File watermarkfile = new File(saveWatermarkPath);if (!watermarkfile.exists()) {watermarkfile.mkdir();}// 创建媒体文件名String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss", Locale.getDefault()).format(new Date());File file = new File(watermarkfile.getPath() + File.separator + timeStamp + ".jpg");if(file!=null){Log.e(TAG, "savaWaterparkFile: success ");}else{Log.e(TAG, "savaWaterparkFile: failure ");}BufferedOutputStream bos = null;try {bos = new BufferedOutputStream(new FileOutputStream(file));if (watermark != null) {watermark.compress(Bitmap.CompressFormat.JPEG, 80, bos);}} catch (FileNotFoundException e) {e.printStackTrace();}try {bos.flush();bos.close();} catch (IOException e) {e.printStackTrace();}}private static int getScreenWidth() {DisplayMetrics dm = new DisplayMetrics();WindowManager wm = (WindowManager) mContext.getSystemService(Context.WINDOW_SERVICE);wm.getDefaultDisplay().getMetrics(dm);return dm.widthPixels;}private static int dp2px(Context context, float dp) {final float scale = context.getResources().getDisplayMetrics().density;return (int) (dp * scale + 0.5f);}}

-----------------------------activity_main-----------------------------

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"tools:context=".MainActivity"android:background="#cccccc"android:orientation="vertical"><ImageViewandroid:layout_width="match_parent"android:layout_height="match_parent"android:scaleType="centerCrop"android:id="@+id/image"/></LinearLayout>

---------------- babygirl.jpg --------------

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