BitmapUtils功能详解

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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。
/* * @Title: BitmapUtils功能详解 * @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; 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;     }   }
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