Android 中图能够用到的图片处理类BitmapUtils

青春须早为，岂能长少年。这篇文章主要讲述Android 中图能够用到的图片处理类BitmapUtils相关的知识，希望能为你提供帮助。
android在实际开发中非常多时候都要对图片进行一定的处理，这里总结的BitmapUtils 类包含一下几个功能：
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给图片加入边框。

6.将View 转换成bitmap
7.将大图片二次压缩
8.压缩图片获得缩略图
【Android 中图能够用到的图片处理类BitmapUtils】9.获得本地文件视频的缩略图
10.获得本地文件图片的缩略图

接下来就直接上代码了，代码中有一定的解释。
直接哪来用就能够了。

< /pre> < pre name="code" class="java"> /* * @Title: BitmapUtils.java * @Description: TODO< 请描写叙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.content.res.Resources; import android.graphics.Bitmap; import android.graphics.BitmapFactory; 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.media.ThumbnailUtils; import android.os.Build; import android.renderscript.Allocation; import android.renderscript.Element; import android.renderscript.RenderScript; import android.renderscript.ScriptIntrinsicBlur; import android.util.Log; import android.view.View; import android.view.View.MeasureSpec; /** * TODO< 请描写叙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< 将控件转换成bitmap类型> * * @throw * @return Bitmap * @param paramView *：须要转换的控件 */ public static Bitmap convertViewToBitmap(View paramView) { paramView.measure( MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED)); paramView.layout(0, 0, paramView.getMeasuredWidth(), paramView.getMeasuredHeight()); paramView.buildDrawingCache(); return paramView.getDrawingCache(); }/** * 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< 给图片加入指定颜色的边框> * * @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; }public static Bitmap decodeSampledBitmapFromResource(Resources res, int resId, int reqWidth, int reqHeight) { final BitmapFactory.Options options = new BitmapFactory.Options(); // 先将inJustDecodeBounds属性设置为true,解码避免内存分配 options.inJustDecodeBounds = true; // 将图片传入选择器中 BitmapFactory.decodeResource(res, resId, options); // 对图片进行指定比例的压缩 options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight); // 待图片处理完毕后再进行内存的分配，避免内存泄露的发生 options.inJustDecodeBounds = false; return BitmapFactory.decodeResource(res, resId, options); }// 计算图片的压缩比例 public static int calculateInSampleSize(BitmapFactory.Options option, int reqWidth, int reqHeight) { // Raw height and width of image final int height = option.outHeight; final int width = option.outWidth; int inSampleSize = 1; if (height > reqHeight || width > reqWidth) {final int heightRatio = Math.round((float) height / (float) reqHeight); final int widthRatio = Math.round((float) width / (float) reqWidth); // 选择长宽高较小的比例。成为压缩比例 inSampleSize = heightRatio < widthRatio ?
heightRatio : widthRatio; } return inSampleSize; }/** * Creates a centered bitmap of the desired size. * * @param source *original bitmap source * @param width *targeted width * @param height *targeted height */ public static Bitmap Thumbnail(Bitmap bm, int reqWidth, int reqHeight) { Bitmap bmp = null; bmp = ThumbnailUtils.extractThumbnail(bm, reqWidth, reqHeight); return bmp; }/** * Creates a centered bitmap of the desired size. * * @param source *original bitmap source * @param width *targeted width * @param height *targeted height * @param options *options used during thumbnail extraction */ public static Bitmap Thumbnail(Bitmap bm, int reqWidth, int reqHeight, int options) { Bitmap bmp = null; bmp = ThumbnailUtils.extractThumbnail(bm, reqWidth, reqHeight, options); return bmp; }//创建文件视频的缩略图 /** * Create a video thumbnail for a video. May return null if the video is * corrupt or the format is not supported. * * @param filePath *the path of video file * @param kind *could be MINI_KIND or MICRO_KIND */ public static Bitmap createVideoThumbnail(String filePath, int kind) { return ThumbnailUtils.createVideoThumbnail(filePath, kind); }//创建文件图片的缩略图 /** * This method first examines if the thumbnail embedded in EXIF is bigger * than our target size. If not, then it‘ll create a thumbnail from original * image. Due to efficiency consideration, we want to let MediaThumbRequest * avoid calling this method twice for both kinds, so it only requests for * MICRO_KIND and set saveImage to true. This method always returns a * "square thumbnail" for MICRO_KIND thumbnail. * * @param filePath *the path of image file * @param kind *could be Images.Thumbnails.MINI_KIND or *Images.Thumbnails.MINI_KIND * @return Bitmap, or null on failures * @hide This method is only used by media framework and media provider *internally. */ public static Bitmap createImageThumbnail(String filePath, int kind) { return ThumbnailUtils.createImageThumbnail(filePath, kind); } }