Android 中图可以用到的图片处理类 BitmapUtils _BitmapUtils

学向勤中得，萤窗万卷书。这篇文章主要讲述Android 中图可以用到的图片处理类 BitmapUtils相关的知识，希望能为你提供帮助。
Android在实际开发中很多时候都要对图片进行一定的处理，这里总结的BitmapUtils 类包括一下几个功能：
1.android图片倒影，
2.Android图片模糊处理，
3.Android图片圆角处理，
4.图片沿着y轴旋转一定角度，
5.Android给图片添加边框。

接下来就直接上代码了，代码中有一定的解释。直接哪来用就可以了。

?

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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 /* * @Title: BitmapUtils.java * @Copyright: Corporation. Ltd. Copyright 1998-2018, All rights reserved * @Description: TODO< 请描述此文件是做什么的> * @author: xjp * @data: 2014年9月18日上午10:10:30 * @version: V1.0 */ package com.mktech.bitmaputils; import android.annotation.SuppressLint; import android.annotation.TargetApi; import android.content.Context; import android.graphics.Bitmap; import android.graphics.BitmapShader; import android.graphics.Camera; import android.graphics.Canvas; import android.graphics.LinearGradient; import android.graphics.Matrix; import android.graphics.Paint; import android.graphics.PorterDuffXfermode; import android.graphics.Bitmap.Config; import android.graphics.Rect; import android.graphics.RectF; import android.graphics.Shader; import android.graphics.Shader.TileMode; import android.os.Build; import android.renderscript.Allocation; import android.renderscript.Element; import android.renderscript.RenderScript; import android.renderscript.ScriptIntrinsicBlur; import android.util.Log; /** * TODO< 请描述这个类是干什么的> * * @author xjp * @data: 2014年9月18日上午10:10:30 * @version: V1.0 */ public class BitmapUtils { private static final String TAG = "BitmapUtils"; /** * * TODO< 创建倒影图片> * @throw * @return Bitmap * @param srcBitmap 源图片的bitmap * @param reflectionHeight 图片倒影的高度 */ public static Bitmap createReflectedBitmap(Bitmap srcBitmap,int reflectionHeight) { if (null == srcBitmap) { Log.e(TAG, "the srcBitmap is null"); return null; } // The gap between the reflection bitmap and original bitmap. final int REFLECTION_GAP = 0; int srcWidth = srcBitmap.getWidth(); int srcHeight = srcBitmap.getHeight(); if (0 == srcWidth || srcHeight == 0) { Log.e(TAG, "the srcBitmap is null"); return null; } // The matrix Matrix matrix = new Matrix(); matrix.preScale(1, -1); try { // The reflection bitmap, width is same with original‘s, height is // half of original‘s. Bitmap reflectionBitmap = Bitmap.createBitmap(srcBitmap, 0, srcHeight - reflectionHeight, srcWidth, reflectionHeight, matrix, false); if (null == reflectionBitmap) { Log.e(TAG, "Create the reflectionBitmap is failed"); return null; } // Create the bitmap which contains original and reflection bitmap. Bitmap bitmapWithReflection = Bitmap.createBitmap(srcWidth, srcHeight + reflectionHeight, Bitmap.Config.ARGB_8888); if (null == bitmapWithReflection) { return null; } // Prepare the canvas to draw stuff. Canvas canvas = new Canvas(bitmapWithReflection); // Draw the original bitmap. canvas.drawBitmap(srcBitmap, 0, 0, null); // Draw the reflection bitmap. canvas.drawBitmap(reflectionBitmap, 0, srcHeight + REFLECTION_GAP, null); Paint paint = new Paint(); paint.setAntiAlias(true); LinearGradient shader = new LinearGradient(0, srcHeight, 0, bitmapWithReflection.getHeight() + REFLECTION_GAP, 0x70FFFFFF, 0x00FFFFFF, TileMode.MIRROR); paint.setShader(shader); paint.setXfermode(new PorterDuffXfermode( android.graphics.PorterDuff.Mode.DST_IN)); canvas.save(); // Draw the linear shader. canvas.drawRect(0, srcHeight, srcWidth, bitmapWithReflection.getHeight() + REFLECTION_GAP, paint); if (reflectionBitmap != null & & !reflectionBitmap.isRecycled()){ reflectionBitmap.recycle(); reflectionBitmap = null; } canvas.restore(); return bitmapWithReflection; } catch (Exception e) { e.printStackTrace(); } Log.e(TAG, "Create the reflectionBitmap is failed"); return null; } /** * * TODO< 图片圆角处理> * @throw * @return Bitmap * @param srcBitmap 源图片的bitmap * @param ret 圆角的度数 */ public static Bitmap getRoundImage(Bitmap srcBitmap, float ret) { if(null == srcBitmap){ Log.e(TAG, "the srcBitmap is null"); return null; } int bitWidth = srcBitmap.getWidth(); int bitHight = srcBitmap.getHeight(); BitmapShader bitmapShader = new BitmapShader(srcBitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP); Paint paint = new Paint(); paint.setAntiAlias(true); paint.setShader(bitmapShader); RectF rectf = new RectF(0, 0, bitWidth, bitHight); Bitmap outBitmap = Bitmap.createBitmap(bitWidth, bitHight, Config.ARGB_8888); Canvas canvas = new Canvas(outBitmap); canvas.drawRoundRect(rectf, ret, ret, paint); canvas.save(); canvas.restore(); return outBitmap; } /** * * TODO< 图片沿着Y轴旋转一定角度> * @throw * @return Bitmap * @param srcBitmap 源图片的bitmap * @param reflectionHeight 图片倒影的高度 * @param rotate 图片旋转的角度 */ public static Bitmap skewImage(Bitmap srcBitmap, float rotate, int reflectionHeight) { if(null == srcBitmap){ Log.e(TAG, "the srcBitmap is null"); return null; } Bitmap reflecteBitmap = createReflectedBitmap(srcBitmap, reflectionHeight); if (null == reflecteBitmap){ Log.e(TAG, "failed to createReflectedBitmap"); return null; } int wBitmap = reflecteBitmap.getWidth(); int hBitmap = reflecteBitmap.getHeight(); float scaleWidth = ((float) 180) / wBitmap; float scaleHeight = ((float) 270) / hBitmap; Matrix matrix = new Matrix(); matrix.postScale(scaleWidth, scaleHeight); reflecteBitmap = Bitmap.createBitmap(reflecteBitmap, 0, 0, wBitmap, hBitmap, matrix, true); Camera localCamera = new Camera(); localCamera.save(); Matrix localMatrix = new Matrix(); localCamera.rotateY(rotate); localCamera.getMatrix(localMatrix); localCamera.restore(); localMatrix.preTranslate(-reflecteBitmap.getWidth() > >1, -reflecteBitmap.getHeight() > >1); Bitmap localBitmap2 = Bitmap.createBitmap(reflecteBitmap, 0, 0, reflecteBitmap.getWidth(), reflecteBitmap.getHeight(), localMatrix, true); Bitmap localBitmap3 = Bitmap.createBitmap(localBitmap2.getWidth(), localBitmap2.getHeight(), Bitmap.Config.ARGB_8888); Canvas localCanvas = new Canvas(localBitmap3); Paint localPaint = new Paint(); localPaint.setAntiAlias(true); localPaint.setFilterBitmap(true); localCanvas.drawBitmap(localBitmap2, 0.0F, 0.0F, localPaint); if (null != reflecteBitmap & & !reflecteBitmap.isRecycled()) { reflecteBitmap.recycle(); reflecteBitmap = null; } if (null != localBitmap2 & & !localBitmap2.isRecycled()) { localBitmap2.recycle(); localBitmap2 = null; } localCanvas.save(); localCanvas.restore(); return localBitmap3; } /** * * TODO< 图片模糊化处理> * @throw * @return Bitmap * @param bitmap 源图片 * @param radius The radius of the blur Supported range 0 < radius < = 25 * @param context 上下文 */ @TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR1) @SuppressLint("NewApi") public static Bitmap blurBitmap(Bitmap bitmap,float radius,Context context){ //Let‘s create an empty bitmap with the same size of the bitmap we want to blur Bitmap outBitmap = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Config.ARGB_8888); //Instantiate a new Renderscript RenderScript rs = RenderScript.create(context); //Create an Intrinsic Blur Script using the Renderscript ScriptIntrinsicBlur blurScript = ScriptIntrinsicBlur.create(rs, Element.U8_4(rs)); //Create the Allocations (in/out) with the Renderscript and the in/out bitmaps Allocation allIn = Allocation.createFromBitmap(rs, bitmap); Allocation allOut = Allocation.createFromBitmap(rs, outBitmap); //Set the radius of the blur if(radius >25){ radius = 25.0f; }else if (radius < =0){ radius = 1.0f; } blurScript.setRadius(radius); //Perform the Renderscript blurScript.setInput(allIn); blurScript.forEach(allOut); //Copy the final bitmap created by the out Allocation to the outBitmap allOut.copyTo(outBitmap); //recycle the original bitmap bitmap.recycle(); bitmap = null; //After finishing everything, we destroy the Renderscript. rs.destroy(); return outBitmap; } /** * TODO< 给图片添加指定颜色的边框> * @param srcBitmap 原图片 * @param borderWidth 边框宽度 * @param color 边框的颜色值 * @return */ public static Bitmap addFrameBitmap(Bitmap srcBitmap,int borderWidth,int color) { if (srcBitmap == null){ Log.e(TAG, "the srcBitmap or borderBitmap is null"); return null; } int newWidth = srcBitmap.getWidth() + borderWidth ; int newHeight = srcBitmap.getHeight() + borderWidth ; Bitmap outBitmap = Bitmap.createBitmap(newWidth, newHeight, Config.ARGB_8888); Canvas canvas = new Canvas(outBitmap); Rect rec = canvas.getClipBounds(); rec.bottom--; rec.right--; Paint paint = new Paint(); //设置边框颜色 paint.setColor(color); paint.setStyle(Paint.Style.STROKE); //设置边框宽度 paint.setStrokeWidth(borderWidth); canvas.drawRect(rec, paint); canvas.drawBitmap(srcBitmap, borderWidth/2, borderWidth/2, null); canvas.save(Canvas.ALL_SAVE_FLAG); canvas.restore(); if (srcBitmap !=null & & !srcBitmap.isRecycled()){ srcBitmap.recycle(); srcBitmap = null; } return outBitmap; } }