/** * 图片工具类 * @author 水寒 * 欢迎访问水寒的个人博客:http://www.sunhome.org.cn * */public class ImageUtil { /** * 设置水印图片在左上角 * @param Context * @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)); } 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(); Bitmap newb = Bitmap.createBitmap(width, height, Config.ARGB_8888); Canvas canvas = new Canvas(newb); canvas.drawBitmap(src, 0, 0, null); canvas.drawBitmap(watermark, paddingLeft, paddingTop, null); canvas.save(Canvas.ALL_SAVE_FLAG); canvas.restore(); return newb; } /** * 设置水印图片在右下角 * @param Context * @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 Context * @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 Context * @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 Context * @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); } /** * 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 paddingLeft * @param paddingTop * @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)); } /** * 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); } private static Bitmap drawTextToBitmap(Context context, Bitmap bitmap, String text, Paint paint, Rect bounds, int paddingLeft, int paddingTop) { android.graphics.Bitmap.Config bitmapConfig = bitmap.getConfig(); paint.setDither(true); paint.setFilterBitmap(true); if (bitmapConfig == null) { bitmapConfig = android.graphics.Bitmap.Config.ARGB_8888; } bitmap = bitmap.copy(bitmapConfig, true); Canvas canvas = new Canvas(bitmap); canvas.drawText(text, paddingLeft, paddingTop, paint); return bitmap; } /** * 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 { int width = src.getWidth(); int height = src.getHeight(); Matrix matrix = new Matrix(); float scaleWidth = (float) (w / width); float scaleHeight = (float) (h / height); matrix.postScale(scaleWidth, scaleHeight); 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); } }
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 11
- 12
- 13
- 14
- 15
- 16
- 17
- 18
- 19
- 20
- 21
- 22
- 23
- 24
- 25
- 26
- 27
- 28
- 29
- 30
- 31
- 32
- 33
- 34
- 35
- 36
- 37
- 38
- 39
- 40
- 41
- 42
- 43
- 44
- 45
- 46
- 47
- 48
- 49
- 50
- 51
- 52
- 53
- 54
- 55
- 56
- 57
- 58
- 59
- 60
- 61
- 62
- 63
- 64
- 65
- 66
- 67
- 68
- 69
- 70
- 71
- 72
- 73
- 74
- 75
- 76
- 77
- 78
- 79
- 80
- 81
- 82
- 83
- 84
- 85
- 86
- 87
- 88
- 89
- 90
- 91
- 92
- 93
- 94
- 95
- 96
- 97
- 98
- 99
- 100
- 101
- 102
- 103
- 104
- 105
- 106
- 107
- 108
- 109
- 110
- 111
- 112
- 113
- 114
- 115
- 116
- 117
- 118
- 119
- 120
- 121
- 122
- 123
- 124
- 125
- 126
- 127
- 128
- 129
- 130
- 131
- 132
- 133
- 134
- 135
- 136
- 137
- 138
- 139
- 140
- 141
- 142
- 143
- 144
- 145
- 146
- 147
- 148
- 149
- 150
- 151
- 152
- 153
- 154
- 155
- 156
- 157
- 158
- 159
- 160
- 161
- 162
- 163
- 164
- 165
- 166
- 167
- 168
- 169
- 170
- 171
- 172
- 173
- 174
- 175
- 176
- 177
- 178
- 179
- 180
- 181
- 182
- 183
- 184
- 185
- 186
- 187
- 188
- 189
- 190
- 191
- 192
- 193
- 194
- 195
- 196
- 197
- 198
- 199
- 200
- 201
- 202
- 203
- 204
- 205
- 206
- 207
- 208
- 209
- 210
- 211
- 212
- 213
- 214
- 215
- 216
- 217
- 218
- 219
- 220
- 221
- 222
- 223
- 224
- 225
- 226
- 227
- 228
- 229
- 230
- 231
- 232
- 233
- 234
- 235
- 236
- 237
- 238
- 239
- 240
- 241
- 242
- 243
- 244
- 245
- 246
- 247
- 248
- 249
- 250
- 251
- 252
- 253
- 254
- 255
- 256
- 257
- 258
- 259
- 260
- 261
- 262
- 263
- 264
- 265
- 266
- 267
- 268
- 269
- 270
- 271
- 272
使用方法如下:
添加一个布局,上面是原始图片,下面是添加水印后的图片
<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" android:orientation="vertical"> <TextView android:id="@+id/sour_pic_title" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="原图" /> <ImageView android:id="@+id/sour_pic" android:layout_width="match_parent" android:layout_height="wrap_content" android:scaleType="centerInside"/> <TextView android:id="@+id/watermark_pic_title" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="水印" /> <ImageView android:id="@+id/wartermark_pic" android:layout_width="match_parent" android:layout_height="wrap_content" android:scaleType="centerInside"/></LinearLayout>
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 11
- 12
- 13
- 14
- 15
- 16
- 17
- 18
- 19
- 20
- 21
- 22
- 23
- 24
- 25
- 26
- 27
- 28
- 29
- 30
- 31
(本文出自水寒的CSDN博客:http://blog.csdn.net/dawanganban)
在Activity中获取到ImageView对象,并且获取Bitmap对象,对Bitmap进行canva绘图,添加水印:
/** * 图片工具类 * @author 水寒 * 欢迎访问水寒的个人博客:http://www.sunhome.org.cn * */public class MainActivity extends Activity { private ImageView mSourImage; private ImageView mWartermarkImage; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initView(); } private void initView(){ mSourImage = (ImageView) findViewById(R.id.sour_pic); mWartermarkImage = (ImageView) findViewById(R.id.wartermark_pic); Bitmap sourBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.sour_pic); mSourImage.setImageBitmap(sourBitmap); Bitmap waterBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.weixin); Bitmap watermarkBitmap = ImageUtil.createWaterMaskCenter(sourBitmap, waterBitmap); watermarkBitmap = ImageUtil.createWaterMaskLeftBottom(this, watermarkBitmap, waterBitmap, 0, 0); watermarkBitmap = ImageUtil.createWaterMaskRightBottom(this, watermarkBitmap, waterBitmap, 0, 0); watermarkBitmap = ImageUtil.createWaterMaskLeftTop(this, watermarkBitmap, waterBitmap, 0, 0); watermarkBitmap = ImageUtil.createWaterMaskRightTop(this, watermarkBitmap, waterBitmap, 0, 0); Bitmap textBitmap = ImageUtil.drawTextToLeftTop(this, watermarkBitmap, "左上角", 16, Color.RED, 0, 0); textBitmap = ImageUtil.drawTextToRightBottom(this, textBitmap, "右下角", 16, Color.RED, 0, 0); textBitmap = ImageUtil.drawTextToRightTop(this, textBitmap, "右上角", 16, Color.RED, 0, 0); textBitmap = ImageUtil.drawTextToLeftBottom(this, textBitmap, "左下角", 16, Color.RED, 0, 0); textBitmap = ImageUtil.drawTextToCenter(this, textBitmap, "中间", 16, Color.RED); mWartermarkImage.setImageBitmap(textBitmap); }}
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 11
- 12
- 13
- 14
- 15
- 16
- 17
- 18
- 19
- 20
- 21
- 22
- 23
- 24
- 25
- 26
- 27
- 28
- 29
- 30
- 31
- 32
- 33
- 34
- 35
- 36
- 37
- 38
- 39
- 40
- 41
- 42