Android 中图可以用到的图片处理类 BitmapUtils
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。
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/* * @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: *** * @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 *** * @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; } } |
以上代码经验证可以直接使用。
分享。
完结。
来自：http://www.2cto.com/kf/201409/335681.html
