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Android 为图片加图片水印和文字水印. 复制即用,阅读即懂_android createwatermaskrightbottom

作者：思考机器5 | 2024-01-30 00:05:45

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android createwatermaskrightbottom

为防止客户的身份证图片流失,防止他人盗用,所以我们的身份证可能需要用到给身份证图片加水印

文章最后会给出demo下载地址

老规矩,线上效果图:

1.首先是我们的图片工具类

  1.  
  2. import android.content.Context;
  3. import android.graphics.Bitmap;
  4. import android.graphics.Canvas;
  5. import android.graphics.Matrix;
  6. import android.graphics.Paint;
  7. import android.graphics.Rect;
  8.  
  9. /**
  10.  * 图片工具类
  11.  *
  12.  */
  13. public class ImageUtil {
  14.  
  15.     /**
  16.      * 设置水印图片在左上角
  17.      * @param context
  18.      * @param src
  19.      * 前者为原图,后者为水印图片
  20.      * @return
  21.      */
  22.     public static Bitmap createWaterMaskLeftTop(
  23.             Context context, Bitmap src, Bitmap watermark,
  24.             int paddingLeft, int paddingTop) {
  25.         return createWaterMaskBitmap(src, watermark, 
  26.                 dp2px(context, paddingLeft), dp2px(context, paddingTop));
  27.     }
  28.  
  29.     private static Bitmap createWaterMaskBitmap(Bitmap src, Bitmap watermark,
  30.             int paddingLeft, int paddingTop) {
  31.         if (src == null) {
  32.             return null;
  33.         }
  34.         int width = src.getWidth();
  35.         int height = src.getHeight();
  36.         //创建一个bitmap
  37.         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
  38.         //将该图片作为画布
  39.         Canvas canvas = new Canvas(newb);
  40.         //在画布 0，0坐标上开始绘制原始图片
  41.         canvas.drawBitmap(src, 0, 0, null);
  42.         //在画布上绘制水印图片
  43.         canvas.drawBitmap(watermark, paddingLeft, paddingTop, null);
  44.         // 保存
  45.         canvas.save(Canvas.ALL_SAVE_FLAG);
  46.         // 存储
  47.         canvas.restore();
  48.         return newb;
  49.     }
  50.  
  51.     /**
  52.      * 设置水印图片在右下角
  53.      * @param Context
  54.      * @param src
  55.      * @param watermark
  56.      * @param paddingRight
  57.      * @param paddingBottom
  58.      * @return
  59.      */
  60.     public static Bitmap createWaterMaskRightBottom(
  61.             Context context, Bitmap src, Bitmap watermark,
  62.             int paddingRight, int paddingBottom) {
  63.         return createWaterMaskBitmap(src, watermark, 
  64.                 src.getWidth() - watermark.getWidth() - dp2px(context, paddingRight), 
  65.                 src.getHeight() - watermark.getHeight() - dp2px(context, paddingBottom));
  66.     }
  67.  
  68.     /**
  69.      * 设置水印图片到右上角
  70.      * @param context
  71.      * @param src
  72.      * @param watermark
  73.      * @param paddingRight
  74.      * @param paddingTop
  75.      * @return
  76.      */
  77.     public static Bitmap createWaterMaskRightTop(
  78.             Context context, Bitmap src, Bitmap watermark,
  79.             int paddingRight, int paddingTop) {
  80.         return createWaterMaskBitmap( src, watermark, 
  81.                 src.getWidth() - watermark.getWidth() - dp2px(context, paddingRight), 
  82.                 dp2px(context, paddingTop));
  83.     }
  84.  
  85.     /**
  86.      * 设置水印图片到左下角
  87.      * @param context
  88.      * @param src
  89.      * @param watermark
  90.      * @param paddingLeft
  91.      * @param paddingBottom
  92.      * @return
  93.      */
  94.     public static Bitmap createWaterMaskLeftBottom(
  95.             Context context, Bitmap src, Bitmap watermark,
  96.             int paddingLeft, int paddingBottom) {
  97.         return createWaterMaskBitmap(src, watermark, dp2px(context, paddingLeft), 
  98.                 src.getHeight() - watermark.getHeight() - dp2px(context, paddingBottom));
  99.     }
  100.  
  101.     /**
  102.      * 设置水印图片到中间
  103.      * @param context
  104.      * @param src
  105.      * @param watermark
  106.      * @return
  107.      */
  108.     public static Bitmap createWaterMaskCenter(Bitmap src, Bitmap watermark) {
  109.         return createWaterMaskBitmap(src, watermark, 
  110.                 (src.getWidth() - watermark.getWidth()) / 2,
  111.                 (src.getHeight() - watermark.getHeight()) / 2);
  112.     }
  113.  
  114.     /**
  115.      * 给图片添加文字到左上角
  116.      * @param context
  117.      * @param bitmap
  118.      * @param text
  119.      * @return
  120.      */
  121.     public static Bitmap drawTextToLeftTop(Context context, Bitmap bitmap, String text,
  122.             int size, int color, int paddingLeft, int paddingTop) {
  123.         Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
  124.         paint.setColor(color);
  125.         paint.setTextSize(dp2px(context, size));
  126.         Rect bounds = new Rect();
  127.         paint.getTextBounds(text, 0, text.length(), bounds);
  128.         return drawTextToBitmap(context, bitmap, text, paint, bounds, 
  129.                 dp2px(context, paddingLeft),  
  130.                 dp2px(context, paddingTop) + bounds.height());
  131.     }
  132.  
  133.     /**
  134.      * 绘制文字到右下角
  135.      * @param context
  136.      * @param bitmap
  137.      * @param text
  138.      * @param size
  139.      * @param color
  140.      * @param paddingBottom
  141.      * @param paddingRight
  142.      * @return
  143.      */
  144.     public static Bitmap drawTextToRightBottom(Context context, Bitmap bitmap, String text,
  145.             int size, int color, int paddingRight, int paddingBottom) {
  146.         Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
  147.         paint.setColor(color);
  148.         paint.setTextSize(dp2px(context, size));
  149.         Rect bounds = new Rect();
  150.         paint.getTextBounds(text, 0, text.length(), bounds);
  151.         return drawTextToBitmap(context, bitmap, text, paint, bounds, 
  152.                 bitmap.getWidth() - bounds.width() - dp2px(context, paddingRight), 
  153.                 bitmap.getHeight() - dp2px(context, paddingBottom));
  154.     }
  155.  
  156.     /**
  157.      * 绘制文字到右上方
  158.      * @param context
  159.      * @param bitmap
  160.      * @param text
  161.      * @param size
  162.      * @param color
  163.      * @param paddingRight
  164.      * @param paddingTop
  165.      * @return
  166.      */
  167.     public static Bitmap drawTextToRightTop(Context context, Bitmap bitmap, String text,
  168.             int size, int color, int paddingRight, int paddingTop) {
  169.         Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
  170.         paint.setColor(color);
  171.         paint.setTextSize(dp2px(context, size));
  172.         Rect bounds = new Rect();
  173.         paint.getTextBounds(text, 0, text.length(), bounds);
  174.         return drawTextToBitmap(context, bitmap, text, paint, bounds, 
  175.                 bitmap.getWidth() - bounds.width() - dp2px(context, paddingRight), 
  176.                 dp2px(context, paddingTop) + bounds.height());
  177.     }
  178.  
  179.     /**
  180.      * 绘制文字到左下方
  181.      * @param context
  182.      * @param bitmap
  183.      * @param text
  184.      * @param size
  185.      * @param color
  186.      * @param paddingLeft
  187.      * @param paddingBottom
  188.      * @return
  189.      */
  190.     public static Bitmap drawTextToLeftBottom(Context context, Bitmap bitmap, String text,
  191.             int size, int color, int paddingLeft, int paddingBottom) {
  192.         Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
  193.         paint.setColor(color);
  194.         paint.setTextSize(dp2px(context, size));
  195.         Rect bounds = new Rect();
  196.         paint.getTextBounds(text, 0, text.length(), bounds);
  197.         return drawTextToBitmap(context, bitmap, text, paint, bounds, 
  198.                 dp2px(context, paddingLeft),  
  199.                 bitmap.getHeight() - dp2px(context, paddingBottom));
  200.     }
  201.  
  202.     /**
  203.      * 绘制文字到中间
  204.      * @param context
  205.      * @param bitmap
  206.      * @param text
  207.      * @param size
  208.      * @param color
  209.      * @return
  210.      */
  211.     public static Bitmap drawTextToCenter(Context context, Bitmap bitmap, String text,
  212.             int size, int color) {
  213.         Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
  214.         paint.setColor(color);
  215.         paint.setTextSize(dp2px(context, size));
  216.         Rect bounds = new Rect();
  217.         paint.getTextBounds(text, 0, text.length(), bounds);
  218.         return drawTextToBitmap(context, bitmap, text, paint, bounds, 
  219.                 (bitmap.getWidth() - bounds.width()) / 2,  
  220.                 (bitmap.getHeight() + bounds.height()) / 2);
  221.     }
  222.  
  223.     //图片上绘制文字
  224.     private static Bitmap drawTextToBitmap(Context context, Bitmap bitmap, String text,
  225.             Paint paint, Rect bounds, int paddingLeft, int paddingTop) {
  226.         android.graphics.Bitmap.Config bitmapConfig = bitmap.getConfig();
  227.  
  228.         paint.setDither(true); // 获取跟清晰的图像采样
  229.         paint.setFilterBitmap(true);// 过滤一些
  230.         if (bitmapConfig == null) {
  231.             bitmapConfig = android.graphics.Bitmap.Config.ARGB_8888;
  232.         }
  233.         bitmap = bitmap.copy(bitmapConfig, true);
  234.         Canvas canvas = new Canvas(bitmap);
  235.  
  236.         canvas.drawText(text, paddingLeft, paddingTop, paint);
  237.         return bitmap;
  238.     }
  239.  
  240.     /**
  241.      * 缩放图片
  242.      * @param src
  243.      * @param w
  244.      * @param h
  245.      * @return
  246.      */
  247.     public static Bitmap scaleWithWH(Bitmap src, double w, double h) {
  248.         if (w == 0 || h == 0 || src == null) {
  249.             return src;
  250.         } else {
  251.             // 记录src的宽高
  252.             int width = src.getWidth();
  253.             int height = src.getHeight();
  254.             // 创建一个matrix容器
  255.             Matrix matrix = new Matrix();
  256.             // 计算缩放比例
  257.             float scaleWidth = (float) (w / width);
  258.             float scaleHeight = (float) (h / height);
  259.             // 开始缩放
  260.             matrix.postScale(scaleWidth, scaleHeight);
  261.             // 创建缩放后的图片
  262.             return Bitmap.createBitmap(src, 0, 0, width, height, matrix, true);
  263.         }
  264.     }
  265.  
  266.     /**
  267.      * dip转pix
  268.      * @param context
  269.      * @param dp
  270.      * @return
  271.      */
  272.     public static int dp2px(Context context, float dp) { 
  273.         final float scale = context.getResources().getDisplayMetrics().density; 
  274.         return (int) (dp * scale + 0.5f); 
  275.     } 
  276. }

2.然后是布局文件

  1. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  2.     xmlns:tools="http://schemas.android.com/tools"
  3.     android:layout_width="match_parent"
  4.     android:layout_height="match_parent"
  5.     android:orientation="vertical">
  6.  
  7.     <TextView
  8.         android:layout_margin="10dp"
  9.         android:gravity="center"
  10.         android:id="@+id/sour_pic_title"
  11.         android:layout_width="match_parent"
  12.         android:layout_height="wrap_content"
  13.         android:text="原图" />
  14.  
  15.     <ImageView
  16.         android:id="@+id/sour_pic"
  17.         android:layout_width="match_parent"
  18.         android:layout_height="wrap_content"
  19.         android:scaleType="centerInside"/>
  20.  
  21.     <TextView
  22.         android:layout_margin="10dp"
  23.         android:gravity="center"
  24.         android:id="@+id/watermark_pic_title"
  25.         android:layout_width="match_parent"
  26.         android:layout_height="wrap_content"
  27.         android:text="水印" />
  28.  
  29.     <ImageView
  30.         android:id="@+id/wartermark_pic"
  31.         android:layout_width="match_parent"
  32.         android:layout_height="wrap_content"
  33.         android:scaleType="centerInside"/>
  34. </LinearLayout>

3.最后是我们的MainActivity

  1.  
  2. import android.app.Activity;
  3. import android.graphics.Bitmap;
  4. import android.graphics.BitmapFactory;
  5. import android.graphics.Color;
  6. import android.os.Bundle;
  7. import android.widget.ImageView;
  8.  
  9. import com.watermark.ImageUtil;
  10. import com.watermark.R;
  11. public class MainActivity extends Activity {
  12.  
  13.     private ImageView mSourImage;
  14.     private ImageView mWartermarkImage;
  15.  
  16.     @Override
  17.     protected void onCreate(Bundle savedInstanceState) {
  18.         super.onCreate(savedInstanceState);
  19.         setContentView(R.layout.activity_main);
  20.  
  21.         initView();
  22.     }
  23.  
  24.     private void initView(){
  25.         mSourImage = (ImageView) findViewById(R.id.sour_pic);
  26.         mWartermarkImage = (ImageView) findViewById(R.id.wartermark_pic);
  27.         Bitmap idCardBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.idcard);
  28.         Bitmap logoBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.icon_logo);
  29.  
  30.         mSourImage.setImageBitmap(idCardBitmap);
  31. //        Bitmap watermarkBitmap = ImageUtil.createWaterMaskCenter(idCardBitmap, logoBitmap);
  32.         Bitmap watermarkBitmap = ImageUtil.createWaterMaskLeftBottom(this, idCardBitmap, logoBitmap, 0, 0);
  33. //        watermarkBitmap = ImageUtil.createWaterMaskRightBottom(this, watermarkBitmap, waterBitmap, 0, 0);
  34. //        watermarkBitmap = ImageUtil.createWaterMaskLeftTop(this, watermarkBitmap, waterBitmap, 0, 0);
  35. //        watermarkBitmap = ImageUtil.createWaterMaskRightTop(this, watermarkBitmap, waterBitmap, 0, 0);
  36.         mWartermarkImage.setImageBitmap(watermarkBitmap);
  37.  
  38. //        Bitmap textBitmap = ImageUtil.drawTextToLeftTop(this, watermarkBitmap, "左上角", 16, Color.RED, 0, 0);
  39. //        textBitmap = ImageUtil.drawTextToRightBottom(this, textBitmap, "右下角", 16, Color.RED, 0, 0);
  40. //        textBitmap = ImageUtil.drawTextToRightTop(this, textBitmap, "右上角", 16, Color.RED, 0, 0);
  41. //        textBitmap = ImageUtil.drawTextToLeftBottom(this, textBitmap, "左下角", 16, Color.RED, 0, 0);
  42. //        textBitmap = ImageUtil.drawTextToCenter(this, textBitmap, "中间", 16, Color.RED);
  43.  
  44. //        mWartermarkImage.setImageBitmap(textBitmap);
  45.     }
  46. }

4.文章下载地址:

Android图片加水印

 

 

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