Android中常用的bitmap處理方法

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收集了很多bitmap相關的處理方法，幾乎全部應用在項目中，所以特記錄下！

package com.tmacsky.utils;import java.io.ByteArrayOutputStream;import java.io.IOException;import android.content.Context;import android.content.res.Resources;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;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.drawable.BitmapDrawable;import android.graphics.drawable.Drawable;import android.view.View;import android.view.View.MeasureSpec;public class ImageUtils {//--->bitmap相關//參考網站http://www.cnblogs.com/fighter/archive/2012/02/20/android-bitmap-drawable.html// 見部落格：http://blog.sina.com.cn/s/blog_afb547c60101j7qn.html/** * View轉成bitmap * @param view * @return */public static Bitmap convertViewToBitmap(View view) {view.setDrawingCacheEnabled(true);view.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED),MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));view.layout(0, 0, view.getMeasuredWidth(), view.getMeasuredHeight());view.buildDrawingCache();return view.getDrawingCache();}/** * 縮放Drawable * @param drawable * @param w  縮放後需要的寬度 * @param h  縮放後需要的高度 * @return */public static Drawable zoomDrawable(Drawable drawable, int w, int h) {        int width = drawable.getIntrinsicWidth();        int height = drawable.getIntrinsicHeight();        // drawable轉換成bitmap        Bitmap oldbmp = drawableToBitmap(drawable);        // 建立操作圖片用的Matrix對象        Matrix matrix = new Matrix();        // 計算縮放比例        float sx = ((float) w / width);        float sy = ((float) h / height);        // 設定縮放比例        matrix.postScale(sx, sy);        // 建立新的bitmap，其內容是對原bitmap的縮放後的圖        Bitmap newbmp = Bitmap.createBitmap(oldbmp, 0, 0, width, height,                matrix, true);        return new BitmapDrawable(newbmp);    }/** * 縮放bitmap * @param oldBitmap 輸入bitmap * @param newWidth  * @param newHeight * @return */public static Bitmap zoomBitmap(Bitmap oldBitmap, int newWidth, int newHeight) {// 獲得圖片的寬高int width = oldBitmap.getWidth();int height = oldBitmap.getHeight();// 計算縮放比例float scaleWidth = ((float) newWidth) / width;float scaleHeight = ((float) newHeight) / height;// 取得想要縮放的matrix參數Matrix matrix = new Matrix();matrix.postScale(scaleWidth, scaleHeight);// 得到新的圖片Bitmap newbm = Bitmap.createBitmap(oldBitmap, 0, 0, width, height, matrix,true);return newbm;}/** * 縮放網狀圖片 依賴於zoomBitmap * @param img * @param newWidth * @param newHeight * @return */public static Bitmap zoomImg(String img, int newWidth, int newHeight) {// 圖片源Bitmap bm = BitmapFactory.decodeFile(img);if (null != bm) {return zoomBitmap(bm, newWidth, newHeight);}return null;}/** * 縮放網狀圖片 依賴於zoomBitmap * @param context * @param img * @param newWidth * @param newHeight * @return */public static Bitmap zoomImg(Context context, String img, int newWidth,int newHeight) {// 圖片源try {Bitmap bm = BitmapFactory.decodeStream(context.getAssets().open(img));if (null != bm) {return zoomBitmap(bm, newWidth, newHeight);}} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}return null;}/** * 判斷bitmap是否存在 * @param bitmap * @return */public static boolean bitmapAvailable(Bitmap bitmap) {return bitmap != null && bitmap.getWidth() > 0 && bitmap.getHeight() > 0;}/** * drawable 轉成bitmap * @param drawable * @return */public static Bitmap drawableToBitmap(Drawable drawable) {        // 取 drawable 的長寬        int w = drawable.getIntrinsicWidth();        int h = drawable.getIntrinsicHeight();        // 取 drawable 的顏色格式        Bitmap.Config config = drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888                : Bitmap.Config.RGB_565;        // 建立對應 bitmap        Bitmap bitmap = Bitmap.createBitmap(w, h, config);        // 建立對應 bitmap 的畫布        Canvas canvas = new Canvas(bitmap);        drawable.setBounds(0, 0, w, h);        // 把 drawable 內容畫到畫布中        drawable.draw(canvas);        return bitmap;    }/** * Bitmap轉換成Drawable * @param context * @param bitmap * @return */public static Drawable bitmapToDrawable(Context context,Bitmap bitmap){//因為BtimapDrawable是Drawable的子類，最終直接使用bd對象即可。BitmapDrawable bd= new BitmapDrawable(context.getResources(), bitmap);return bd;}/** * 從資源中擷取Bitmap * @param context * @param req  R.drawable.icon(eg.) * @return */public Bitmap getBitmapFromResources(Context context,int req){  Resources res = context.getResources();  Bitmap bmp = BitmapFactory.decodeResource(res, req);  return bmp;}/** * Byte[] -> Bitmap的轉換 */public Bitmap Bytes2Bimap(byte[] b) {        if (b.length != 0) {            return BitmapFactory.decodeByteArray(b, 0, b.length);        } else {            return null;        }    }/** * Bitmap->Byte[]的轉換 * @param bm * @return */ public byte[] Bitmap2Bytes(Bitmap bm) { ByteArrayOutputStream baos = new ByteArrayOutputStream(); bm.compress(Bitmap.CompressFormat.PNG, 100, baos); return baos.toByteArray();    }/** * 擷取圓角圖片 * @param bitmap * @param roundPx 圓角的弧度 * @return */public static Bitmap getRoundedCornerBitmap(Bitmap bitmap, float roundPx) {        int w = bitmap.getWidth();        int h = bitmap.getHeight();        Bitmap output = Bitmap.createBitmap(w, h, Config.ARGB_8888);        Canvas canvas = new Canvas(output);        final int color = 0xff424242;        final Paint paint = new Paint();        final Rect rect = new Rect(0, 0, w, h);        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;    }}