//壓縮圖片大小 public static Bitmap compressImage(Bitmap image) { ByteArrayOutputStream baos = new ByteArrayOutputStream(); image.compress(Bitmap.CompressFormat.JPEG, 100, baos);//質(zhì)量壓縮方法,這里100表示不壓縮,把壓縮后的數(shù)據(jù)存放到baos中 int options = 100; while ( baos.toByteArray().length / 1024>100) { //循環(huán)判斷如果壓縮后圖片是否大于100kb,大于繼續(xù)壓縮 baos.reset();//重置baos即清空baos image.compress(Bitmap.CompressFormat.JPEG, options, baos);//這里壓縮options%,把壓縮后的數(shù)據(jù)存放到baos中 options -= 10;//每次都減少10 } ByteArrayInputStream isBm = new ByteArrayInputStream(baos.toByteArray());//把壓縮后的數(shù)據(jù)baos存放到ByteArrayInputStream中 Bitmap bitmap = BitmapFactory.decodeStream(isBm, null, null);//把ByteArrayInputStream數(shù)據(jù)生成圖片 return bitmap; }
/** * 將彩色圖轉(zhuǎn)換為灰度圖 * @param img 位圖 * @return 返回轉(zhuǎn)換好的位圖 */ public Bitmap convertGreyImg(Bitmap img) { int width = img.getWidth(); //獲取位圖的寬 int height = img.getHeight(); //獲取位圖的高 int []pixels = new int[width * height]; //通過位圖的大小創(chuàng)建像素點(diǎn)數(shù)組 img.getPixels(pixels, 0, width, 0, 0, width, height); int alpha = 0xFF << 24; for(int i = 0; i < height; i++) { for(int j = 0; j < width; j++) { int grey = pixels[width * i + j]; int red = ((grey & 0x00FF0000 ) >> 16); int green = ((grey & 0x0000FF00) >> 8); int blue = (grey & 0x000000FF); grey = (int)((float) red * 0.3 + (float)green * 0.59 + (float)blue * 0.11); grey = alpha | (grey << 16) | (grey << 8) | grey; pixels[width * i + j] = grey; } } Bitmap result = Bitmap.createBitmap(width, height, Config.RGB_565); result.setPixels(pixels, 0, width, 0, 0, width, height); return result; }

將一個(gè)圖片切割成多個(gè)圖片
有種場(chǎng)景,我們想將一個(gè)圖片切割成多個(gè)圖片。比如我們?cè)陂_發(fā)一個(gè)拼圖的游戲,就首先要對(duì)圖片進(jìn)行切割。
以下是封裝好的兩個(gè)類,可以實(shí)現(xiàn)圖片的切割。僅供參考和學(xué)習(xí)。
一個(gè)是ImagePiece類,此類保存了一個(gè)Bitmap對(duì)象和一個(gè)標(biāo)識(shí)圖片的順序索引的int變量。
import android.graphics.Bitmap; public class ImagePiece { public int index = 0; public Bitmap bitmap = null; }
一個(gè)是ImageSplitter類,有一個(gè)靜態(tài)方法split,傳入的參數(shù)是要切割的Bitmap對(duì)象,和橫向和豎向的切割片數(shù)。比如傳入的是3、3,則橫豎向都切割成3片,最終會(huì)將整個(gè)圖片切割成3X3=9片。
import java.util.ArrayList; import java.util.List; import android.graphics.Bitmap; public class ImageSplitter { public static List<ImagePiece> split(Bitmap bitmap, int xPiece, int yPiece) { List<ImagePiece> pieces = new ArrayList<ImagePiece>(xPiece * yPiece); int width = bitmap.getWidth(); int height = bitmap.getHeight(); int pieceWidth = width / 3; int pieceHeight = height / 3; for (int i = 0; i < yPiece; i++) { for (int j = 0; j < xPiece; j++) { ImagePiece piece = new ImagePiece(); piece.index = j + i * xPiece; int xValue = j * pieceWidth; int yValue = i * pieceHeight; piece.bitmap = Bitmap.createBitmap(bitmap, xValue, yValue, pieceWidth, pieceHeight); pieces.add(piece); } } return pieces; } }
1、圖標(biāo)加灰色過濾;
2、android的圖片資源默認(rèn)是靜態(tài)的,單實(shí)例;如果兩個(gè)IM好友的頭像一樣,最簡(jiǎn)單的都是用的軟件自帶頭像,有一個(gè)在線,一個(gè)離線,直接改變頭像的灰度,則兩個(gè)用戶的頭像都會(huì)變灰或者在線,答案是:Drawable.mutate()。
Drawable mDrawable = context.getResources().getDrawable(R.drawable.face_icon); //Make this drawable mutable. //A mutable drawable is guaranteed to not share its state with any other drawable. mDrawable.mutate(); ColorMatrix cm = new ColorMatrix(); cm.setSaturation(0); ColorMatrixColorFilter cf = new ColorMatrixColorFilter(cm); mDrawable.setColorFilter(cf);
生成縮略圖,摳自android launcher源碼:
/* * Copyright (C) 2008 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.android.launcher; import android.graphics.drawable.BitmapDrawable; import android.graphics.drawable.Drawable; import android.graphics.drawable.PaintDrawable; import android.graphics.Bitmap; import android.graphics.PixelFormat; import android.graphics.Canvas; import android.graphics.PaintFlagsDrawFilter; import android.graphics.Paint; import android.graphics.Rect; import android.content.res.Resources; import android.content.Context; /** * Various utilities shared amongst the Launcher's classes. */ final class Utilities { private static int sIconWidth = -1; private static int sIconHeight = -1; private static final Paint sPaint = new Paint(); private static final Rect sBounds = new Rect(); private static final Rect sOldBounds = new Rect(); private static Canvas sCanvas = new Canvas(); static { sCanvas.setDrawFilter(new PaintFlagsDrawFilter(Paint.DITHER_FLAG, Paint.FILTER_BITMAP_FLAG)); } /** * Returns a Drawable representing the thumbnail of the specified Drawable. * The size of the thumbnail is defined by the dimension * android.R.dimen.launcher_application_icon_size. * * This method is not thread-safe and should be invoked on the UI thread only. * * @param icon The icon to get a thumbnail of. * @param context The application's context. * * @return A thumbnail for the specified icon or the icon itself if the * thumbnail could not be created. */ static Drawable createIconThumbnail(Drawable icon, Context context) { if (sIconWidth == -1) { final Resources resources = context.getResources(); sIconWidth = sIconHeight = (int) resources.getDimension(android.R.dimen.app_icon_size); } int width = sIconWidth; int height = sIconHeight; float scale = 1.0f; if (icon instanceof PaintDrawable) { PaintDrawable painter = (PaintDrawable) icon; painter.setIntrinsicWidth(width); painter.setIntrinsicHeight(height); } else if (icon instanceof BitmapDrawable) { // Ensure the bitmap has a density. BitmapDrawable bitmapDrawable = (BitmapDrawable) icon; Bitmap bitmap = bitmapDrawable.getBitmap(); if (bitmap.getDensity() == Bitmap.DENSITY_NONE) { bitmapDrawable.setTargetDensity(context.getResources().getDisplayMetrics()); } } int iconWidth = icon.getIntrinsicWidth(); int iconHeight = icon.getIntrinsicHeight(); if (width > 0 && height > 0) { if (width < iconWidth || height < iconHeight || scale != 1.0f) { final float ratio = (float) iconWidth / iconHeight; if (iconWidth > iconHeight) { height = (int) (width / ratio); } else if (iconHeight > iconWidth) { width = (int) (height * ratio); } final Bitmap.Config c = icon.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; final Bitmap thumb = Bitmap.createBitmap(sIconWidth, sIconHeight, c); final Canvas canvas = sCanvas; canvas.setBitmap(thumb); // Copy the old bounds to restore them later // If we were to do oldBounds = icon.getBounds(), // the call to setBounds() that follows would // change the same instance and we would lose the // old bounds sOldBounds.set(icon.getBounds()); final int x = (sIconWidth - width) / 2; final int y = (sIconHeight - height) / 2; icon.setBounds(x, y, x + width, y + height); icon.draw(canvas); icon.setBounds(sOldBounds); icon = new FastBitmapDrawable(thumb); } else if (iconWidth < width && iconHeight < height) { final Bitmap.Config c = Bitmap.Config.ARGB_8888; final Bitmap thumb = Bitmap.createBitmap(sIconWidth, sIconHeight, c); final Canvas canvas = sCanvas; canvas.setBitmap(thumb); sOldBounds.set(icon.getBounds()); final int x = (width - iconWidth) / 2; final int y = (height - iconHeight) / 2; icon.setBounds(x, y, x + iconWidth, y + iconHeight); icon.draw(canvas); icon.setBounds(sOldBounds); icon = new FastBitmapDrawable(thumb); } } return icon; } /** * Returns a Bitmap representing the thumbnail of the specified Bitmap. * The size of the thumbnail is defined by the dimension * android.R.dimen.launcher_application_icon_size. * * This method is not thread-safe and should be invoked on the UI thread only. * * @param bitmap The bitmap to get a thumbnail of. * @param context The application's context. * * @return A thumbnail for the specified bitmap or the bitmap itself if the * thumbnail could not be created. */ static Bitmap createBitmapThumbnail(Bitmap bitmap, Context context) { if (sIconWidth == -1) { final Resources resources = context.getResources(); sIconWidth = sIconHeight = (int) resources.getDimension( android.R.dimen.app_icon_size); } int width = sIconWidth; int height = sIconHeight; final int bitmapWidth = bitmap.getWidth(); final int bitmapHeight = bitmap.getHeight(); if (width > 0 && height > 0) { if (width < bitmapWidth || height < bitmapHeight) { final float ratio = (float) bitmapWidth / bitmapHeight; if (bitmapWidth > bitmapHeight) { height = (int) (width / ratio); } else if (bitmapHeight > bitmapWidth) { width = (int) (height * ratio); } final Bitmap.Config c = (width == sIconWidth && height == sIconHeight) ? bitmap.getConfig() : Bitmap.Config.ARGB_8888; final Bitmap thumb = Bitmap.createBitmap(sIconWidth, sIconHeight, c); final Canvas canvas = sCanvas; final Paint paint = sPaint; canvas.setBitmap(thumb); paint.setDither(false); paint.setFilterBitmap(true); sBounds.set((sIconWidth - width) / 2, (sIconHeight - height) / 2, width, height); sOldBounds.set(0, 0, bitmapWidth, bitmapHeight); canvas.drawBitmap(bitmap, sOldBounds, sBounds, paint); return thumb; } else if (bitmapWidth < width || bitmapHeight < height) { final Bitmap.Config c = Bitmap.Config.ARGB_8888; final Bitmap thumb = Bitmap.createBitmap(sIconWidth, sIconHeight, c); final Canvas canvas = sCanvas; final Paint paint = sPaint; canvas.setBitmap(thumb); paint.setDither(false); paint.setFilterBitmap(true); canvas.drawBitmap(bitmap, (sIconWidth - bitmapWidth) / 2, (sIconHeight - bitmapHeight) / 2, paint); return thumb; } } return bitmap; } }
//Android Matrix類實(shí)現(xiàn)鏡像方法 public void drawRegion(Image image_src, int x_src, int y_src, int width, int height, int transform, int x_dest, int y_dest, int anchor){ if((anchor&VCENTER) != 0){ y_dest -= height/2; }else if((anchor&BOTTOM) != 0){ y_dest -= height; } if((anchor&RIGHT) != 0){ x_dest -= width; }else if((anchor&HCENTER) != 0){ x_dest -= width/2; } Bitmap newMap = Bitmap.createBitmap(image_src.getBitmap(), x_src, y_src, width, height); Matrix mMatrix = new Matrix(); Matrix temp = new Matrix(); Matrix temp2 = new Matrix(); float[] mirrorY = { -1, 0, 0, 0, 1, 0, 0, 0, 1 }; temp.setValues(mirrorY); switch(transform){ case Sprite.TRANS_NONE: break; case Sprite.TRANS_ROT90: mMatrix.setRotate(90,width/2, height/2); break; case Sprite.TRANS_ROT180: mMatrix.setRotate(180,width/2, height/2); break; case Sprite.TRANS_ROT270: mMatrix.setRotate(270,width/2, height/2); break; case Sprite.TRANS_MIRROR: mMatrix.postConcat(temp); break; case Sprite.TRANS_MIRROR_ROT90: mMatrix.postConcat(temp); mMatrix.setRotate(90,width/2, height/2); break; case Sprite.TRANS_MIRROR_ROT180: mMatrix.postConcat(temp); mMatrix.setRotate(180,width/2, height/2); break; case Sprite.TRANS_MIRROR_ROT270: mMatrix.postConcat(temp); mMatrix.setRotate(270,width/2, height/2); break; } mMatrix.setTranslate(x_dest, y_dest); canvas.drawBitmap(newMap, mMatrix, mPaint); }
//圖片Url保存為位圖并進(jìn)行縮放操作 //通過傳入圖片url獲取位圖方法 public Bitmap returnBitMap(String url) { URL myFileUrl = null; Bitmap bitmap = null; try { myFileUrl = new URL(url); } catch (MalformedURLException e) { e.printStackTrace(); } try { HttpURLConnection conn = (HttpURLConnection) myFileUrl .openConnection(); conn.setDoInput(true); conn.connect(); InputStream is = conn.getInputStream(); bitmap = BitmapFactory.decodeStream(is); is.close(); } catch (IOException e) { e.printStackTrace(); } Log.v(tag, bitmap.toString()); return bitmap; } //通過傳入位圖,新的寬.高比進(jìn)行位圖的縮放操作 public static Drawable resizeImage(Bitmap bitmap, int w, int h) { // load the origial Bitmap Bitmap BitmapOrg = bitmap; int width = BitmapOrg.getWidth(); int height = BitmapOrg.getHeight(); int newWidth = w; int newHeight = h; Log.v(tag, String.valueOf(width)); Log.v(tag, String.valueOf(height)); Log.v(tag, String.valueOf(newWidth)); Log.v(tag, String.valueOf(newHeight)); // calculate the scale float scaleWidth = ((float) newWidth) / width; float scaleHeight = ((float) newHeight) / height; // create a matrix for the manipulation Matrix matrix = new Matrix(); // resize the Bitmap matrix.postScale(scaleWidth, scaleHeight); // if you want to rotate the Bitmap // matrix.postRotate(45); // recreate the new Bitmap Bitmap resizedBitmap = Bitmap.createBitmap(BitmapOrg, 0, 0, width, height, matrix, true); // make a Drawable from Bitmap to allow to set the Bitmap // to the ImageView, ImageButton or what ever return new BitmapDrawable(resizedBitmap); }
1.圖片加載方法,方便用戶加載圖片 /*** * 加載本地圖片 * @param context:主運(yùn)行函數(shù)實(shí)例 * @param bitAdress:圖片地址,一般指向R下的drawable目錄 * @return */ public final Bitmap CreatImage(Context context, int bitAdress) { Bitmap bitmaptemp = null; bitmaptemp = BitmapFactory.decodeResource(context.getResources(), bitAdress); return bitmaptemp; } 2.圖片平均分割方法,將大圖平均分割為N行N列,方便用戶使用 /*** * 圖片分割 * * @param g * :畫布 * @param paint * :畫筆 * @param imgBit * :圖片 * @param x * :X軸起點(diǎn)坐標(biāo) * @param y * :Y軸起點(diǎn)坐標(biāo) * @param w * :?jiǎn)我粓D片的寬度 * @param h * :?jiǎn)我粓D片的高度 * @param line * :第幾列 * @param row * :第幾行 */ public final void cuteImage(Canvas g, Paint paint, Bitmap imgBit, int x, int y, int w, int h, int line, int row) { g.clipRect(x, y, x + w, h + y); g.drawBitmap(imgBit, x – line * w, y – row * h, paint); g.restore(); } 3.圖片縮放,對(duì)當(dāng)前圖片進(jìn)行縮放處理 /*** * 圖片的縮放方法 * * @param bgimage * :源圖片資源 * @param newWidth * :縮放后寬度 * @param newHeight * :縮放后高度 * @return */ public Bitmap zoomImage(Bitmap bgimage, int newWidth, int newHeight) { // 獲取這個(gè)圖片的寬和高 int width = bgimage.getWidth(); int height = bgimage.getHeight(); // 創(chuàng)建操作圖片用的matrix對(duì)象 Matrix matrix = new Matrix(); // 計(jì)算縮放率,新尺寸除原始尺寸 float scaleWidth = ((float) newWidth) / width; float scaleHeight = ((float) newHeight) / height; // 縮放圖片動(dòng)作 matrix.postScale(scaleWidth, scaleHeight); Bitmap bitmap = Bitmap.createBitmap(bgimage, 0, 0, width, height, matrix, true); return bitmap; } 4.繪制帶有邊框的文字,一般在游戲中起文字的美化作用 /*** * 繪制帶有邊框的文字 * * @param strMsg * :繪制內(nèi)容 * @param g * :畫布 * @param paint * :畫筆 * @param setx * ::X軸起始坐標(biāo) * @param sety * :Y軸的起始坐標(biāo) * @param fg * :前景色 * @param bg * :背景色 */ public void drawText(String strMsg, Canvas g, Paint paint, int setx, int sety, int fg, int bg) { paint.setColor(bg); g.drawText(strMsg, setx + 1, sety, paint); g.drawText(strMsg, setx, sety – 1, paint); g.drawText(strMsg, setx, sety + 1, paint); g.drawText(strMsg, setx – 1, sety, paint); paint.setColor(fg); g.drawText(strMsg, setx, sety, paint); g.restore(); } 5.Android 圖片透明度處理代碼 /** * 圖片透明度處理 * * @param sourceImg * 原始圖片 * @param number * 透明度 * @return */ public static Bitmap setAlpha(Bitmap sourceImg, int number) { int[] argb = new int[sourceImg.getWidth() * sourceImg.getHeight()]; sourceImg.getPixels(argb, 0, sourceImg.getWidth(), 0, 0,sourceImg.getWidth(), sourceImg.getHeight());// 獲得圖片的ARGB值 number = number * 255 / 100; for (int i = 0; i < argb.length; i++) { argb = (number << 24) | (argb & 0×00FFFFFF);// 修改最高2位的值 } sourceImg = Bitmap.createBitmap(argb, sourceImg.getWidth(), sourceImg.getHeight(), Config.ARGB_8888); return sourceImg; } 6.圖片翻轉(zhuǎn) Resources res = this.getContext().getResources(); img = BitmapFactory.decodeResource(res, R.drawable.slogo); Matrix matrix = new Matrix(); matrix.postRotate(90); /*翻轉(zhuǎn)90度*/ int width = img.getWidth(); int height = img.getHeight(); r_img = Bitmap.createBitmap(img, 0, 0, width, height, matrix, true);
import android.graphics.Bitmap; import android.graphics.Canvas; import android.graphics.LinearGradient; import android.graphics.Matrix; import android.graphics.Paint; import android.graphics.PixelFormat; import android.graphics.PorterDuffXfermode; import android.graphics.Rect; import android.graphics.RectF; import android.graphics.Bitmap.Config; import android.graphics.PorterDuff.Mode; import android.graphics.Shader.TileMode; import android.graphics.drawable.Drawable; /** * * @author superdev * @version 1.0 * */ public class ImageUtil { /** * 放大縮小圖片 */ public static Bitmap zoomBitmap(Bitmap bitmap, int w, int h) { int width = bitmap.getWidth(); int height = bitmap.getHeight(); Matrix matrix = new Matrix(); float scaleWidht = ((float) w / width); float scaleHeight = ((float) h / height); matrix.postScale(scaleWidht, scaleHeight); Bitmap newbmp = Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, true); return newbmp; } /** * 將Drawable轉(zhuǎn)化為Bitmap */ public static Bitmap drawableToBitmap(Drawable drawable) { int width = drawable.getIntrinsicWidth(); int height = drawable.getIntrinsicHeight(); Bitmap bitmap = Bitmap.createBitmap(width, height, drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565); Canvas canvas = new Canvas(bitmap); drawable.setBounds(0, 0, width, height); drawable.draw(canvas); return bitmap; } /** * 獲得圓角圖片的方法 */ public static Bitmap getRoundedCornerBitmap(Bitmap bitmap, float roundPx) { Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Config.ARGB_8888); Canvas canvas = new Canvas(output); final int color = 0xff424242; final Paint paint = new Paint(); final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight()); final RectF rectF = new RectF(rect); paint.setAntiAlias(true); canvas.drawARGB(0, 0, 0, 0); paint.setColor(color); canvas.drawRoundRect(rectF, roundPx, roundPx, paint); paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN)); canvas.drawBitmap(bitmap, rect, rect, paint); return output; } /** * 獲得帶倒影的圖片方法 */ public static Bitmap createReflectionImageWithOrigin(Bitmap bitmap) { final int reflectionGap = 4; int width = bitmap.getWidth(); int height = bitmap.getHeight(); Matrix matrix = new Matrix(); matrix.preScale(1, -1); Bitmap reflectionImage = Bitmap.createBitmap(bitmap, 0, height / 2, width, height / 2, matrix, false); Bitmap bitmapWithReflection = Bitmap.createBitmap(width, (height + height / 2), Config.ARGB_8888); Canvas canvas = new Canvas(bitmapWithReflection); canvas.drawBitmap(bitmap, 0, 0, null); Paint deafalutPaint = new Paint(); canvas.drawRect(0, height, width, height + reflectionGap, deafalutPaint); canvas.drawBitmap(reflectionImage, 0, height + reflectionGap, null); Paint paint = new Paint(); LinearGradient shader = new LinearGradient(0, bitmap.getHeight(), 0, bitmapWithReflection.getHeight() + reflectionGap, 0x70ffffff, 0x00ffffff, TileMode.CLAMP); paint.setShader(shader); // Set the Transfer mode to be porter duff and destination in paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN)); // Draw a rectangle using the paint with our linear gradient canvas.drawRect(0, height, width, bitmapWithReflection.getHeight() + reflectionGap, paint); return bitmapWithReflection; } }
private byte[] Bitmap2Bytes(Bitmap bm){ ByteArrayOutputStream baos = new ByteArrayOutputStream(); bm.compress(Bitmap.CompressFormat.PNG, 100, baos); return baos.toByteArray(); } private Bitmap Bytes2Bimap(byte[] b){ if(b.length!=0){ return BitmapFactory.decodeByteArray(b, 0, b.length); } else { return null; } } /** * create the bitmap from a byte array *生成水印圖片 * @param src the bitmap object you want proecss * @param watermark the water mark above the src * @return return a bitmap object ,if paramter's length is 0,return null */ private Bitmap createBitmap( Bitmap src, Bitmap watermark ) { String tag = "createBitmap"; Log.d( tag, "create a new bitmap" ); if( src == null ) { return null; } int w = src.getWidth(); int h = src.getHeight(); int ww = watermark.getWidth(); int wh = watermark.getHeight(); //create the new blank bitmap Bitmap newb = Bitmap.createBitmap( w, h, Config.ARGB_8888 );//創(chuàng)建一個(gè)新的和SRC長度寬度一樣的位圖 Canvas cv = new Canvas( newb ); //draw src into cv.drawBitmap( src, 0, 0, null );//在 0,0坐標(biāo)開始畫入src //draw watermark into cv.drawBitmap( watermark, w - ww + 5, h - wh + 5, null );//在src的右下角畫入水印 //save all clip cv.save( Canvas.ALL_SAVE_FLAG );//保存 //store cv.restore();//存儲(chǔ) return newb; } /** 重新編碼Bitmap * * @param src * 需要重新編碼的Bitmap * * @param format * 編碼后的格式(目前只支持png和jpeg這兩種格式) * * @param quality * 重新生成后的bitmap的質(zhì)量 * * @return * 返回重新生成后的bitmap */ private static Bitmap codec(Bitmap src, Bitmap.CompressFormat format, int quality) { ByteArrayOutputStream os = new ByteArrayOutputStream(); src.compress(format, quality, os); byte[] array = os.toByteArray(); return BitmapFactory.decodeByteArray(array, 0, array.length); } //Stream轉(zhuǎn)換成Byte static byte[] streamToBytes(InputStream is) { ByteArrayOutputStream os = new ByteArrayOutputStream(1024); byte[] buffer = new byte[1024]; int len; try { while ((len = is.read(buffer)) >= 0) { os.write(buffer, 0, len); } } catch (java.io.IOException e) { } return os.toByteArray(); } //把View轉(zhuǎn)換成Bitmap /** * 把一個(gè)View的對(duì)象轉(zhuǎn)換成bitmap */ static Bitmap getViewBitmap(View v) { v.clearFocus(); v.setPressed(false); //能畫緩存就返回false boolean willNotCache = v.willNotCacheDrawing(); v.setWillNotCacheDrawing(false); int color = v.getDrawingCacheBackgroundColor(); v.setDrawingCacheBackgroundColor(0); if (color != 0) { v.destroyDrawingCache(); } v.buildDrawingCache(); Bitmap cacheBitmap = v.getDrawingCache(); if (cacheBitmap == null) { Log.e(TAG, "failed getViewBitmap(" + v + ")", new RuntimeException()); return null; } Bitmap bitmap = Bitmap.createBitmap(cacheBitmap); // Restore the view v.destroyDrawingCache(); v.setWillNotCacheDrawing(willNotCache); v.setDrawingCacheBackgroundColor(color); return bitmap; }
讀取raw資源文件中的mp3文件,然后通過音樂播放器播放: /** * 把mp3文件寫入卡 * * @param fileName * 輸出的文件名(全路徑) * @param context * context對(duì)象 */ private void writeMP3ToSDcard(String fileName, Context context) { byte[] buffer = new byte[1024 * 8]; int read; BufferedInputStream bin = new BufferedInputStream(context.getResources().openRawResource(R.raw.ring)); try { BufferedOutputStream bout = new BufferedOutputStream(new FileOutputStream(fileName)); while ((read = bin.read(buffer)) > -1) { bout.write(buffer, 0, read); } bout.flush(); bout.close(); bin.close(); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } Intent intent = new Intent(); intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); intent.setAction(android.content.Intent.ACTION_VIEW); intent.setDataAndType(Uri.fromFile(newFile("XXXXmp3的文件全路徑")),"audio/*"); startActivity(intent);
繪制圖像倒影
private void _Init() { m_paint = new Paint(Paint.ANTI_ALIAS_FLAG); LinearGradient lg = new LinearGradient( 0, 0, 0, m_nShadowH, 0xB0FFFFFF, 0x00000000, Shader.TileMode.CLAMP); m_paint.setShader(lg); m_paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.MULTIPLY)); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); int nX = 0; int nY = 20; _DrawNormalImg(canvas, nX, nY); _DrawMirror(canvas, nX, nY); } private void _DrawNormalImg(Canvas canvas, int nX, int nY) { canvas.save(Canvas.MATRIX_SAVE_FLAG); canvas.translate(nX, nY); m_dw.draw(canvas); canvas.restore(); } private void _DrawMirror(Canvas canvas, int nX, int nY) { int nW = m_dw.getIntrinsicWidth(); int nH = m_dw.getIntrinsicHeight(); /////////////////////////////////// //draw mirror image canvas.save(Canvas.MATRIX_SAVE_FLAG); canvas.scale(1.0f, -1.0f); canvas.translate(nX, -(nY + nH * 2)); canvas.clipRect(0, nH, nW, nH - m_nShadowH); m_dw.draw(canvas); canvas.restore(); ////////////////////////////// //draw mask canvas.save(); canvas.translate(nX, nY + nH); canvas.drawRect(0, 0, nW, m_nShadowH, m_paint); canvas.restore(); }
Android 繪圖座標(biāo)體系預(yù)設(shè)的原點(diǎn)在左上角,X 軸往右是越來越大的正值,而 Y 軸往下,則是越來越大的正值。要畫出垂直翻轉(zhuǎn)的圖片,其實(shí)也就是要垂直翻轉(zhuǎn)整個(gè)繪圖座標(biāo)體系。在 Android 中,要如何做?答案就是 canvas.scale(1.0f, -1.0f)。很簡(jiǎn)單吧,沒想到給 scale() 函式一個(gè)負(fù)值,就可以翻轉(zhuǎn)相對(duì)應(yīng)的軸。
在 Photoshop 中,做鏡像特效的第二步是要對(duì)這翻轉(zhuǎn)的圖片,加個(gè)由灰到黑的漸層 mask。
在 Android 中,要畫漸層色,那就一定得用 LinearGradient 這個(gè)類別。至於要對(duì)背景圖加上個(gè) mask,就請(qǐng)參考一下 Paint 的 setXfermode() 函式。_Init() 這個(gè)函式,就是負(fù)責(zé)生成一個(gè)由灰到黑漸層 mask 的 m_paint 物件。

http://blog.csdn.net/Android_Tutor/archive/2010/11/02/5981753.aspx
http://www.cnblogs.com/TerryBlog/archive/2012/01/08/2316482.html
android常用圖片特效處理
http://www.eoeandroid.com/thread-170526-1-1.html
相機(jī)(Camera)實(shí)時(shí)濾鏡效果
http://www.eoeandroid.com/thread-171528-1-1.html
Android, WindowsPhone7, IOS ,vc2010平臺(tái)40多套圖片濾鏡開源
http://www.cnblogs.com/daizhj/archive/2012/05/15/2501406.html
Android實(shí)現(xiàn)獲取本機(jī)中所有圖片
http://www.cnblogs.com/hanyonglu/archive/2012/05/10/2494908.html
Android 圖片處理工具類封裝
http://www.open-open.com/lib/view/open1386682905126.html
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