android 常用Bitmap处理方法收集：普通裁剪，缩放，圆形裁剪

代码是平常使用时收集的，并不是本人所写。这些bitmap处理方法在我的android程序里面使用相对较多，希望对大家也有些帮助。

import android.graphics.Bitmap;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Matrix;import android.graphics.Paint;import android.graphics.PorterDuff;import android.graphics.PorterDuffXfermode;import android.graphics.Rect;import android.graphics.RectF;public class AdjustBitmap {    //将bitmap调整到指定大小    public static Bitmap sizeBitmap(Bitmap origin, int newWidth, int newHeight) {        if (origin == null) {            return null;        }        int height = origin.getHeight();        int width = origin.getWidth();        float scaleWidth = ((float) newWidth) / width;        float scaleHeight = ((float) newHeight) / height;        Matrix matrix = new Matrix();        matrix.postScale(scaleWidth, scaleHeight);// 使用后乘        Bitmap newBM = Bitmap.createBitmap(origin, 0, 0, width, height, matrix, false);        if (!origin.isRecycled()) {//这时候origin还有吗？            origin.recycle();        }        return newBM;    }    //按比例缩放    public static Bitmap scaleBitmap(Bitmap origin, float scale) {        if (origin == null) {            return null;        }        int width = origin.getWidth();        int height = origin.getHeight();        Matrix matrix = new Matrix();        matrix.preScale(scale, scale);        Bitmap newBM = Bitmap.createBitmap(origin, 0, 0, width, height, matrix, false);        if (newBM.equals(origin)) {            return newBM;        }        origin.recycle();        return newBM;    }    public static Bitmap cropBitmap(Bitmap bitmap) {//从中间截取一个正方形        int w = bitmap.getWidth(); // 得到图片的宽，高        int h = bitmap.getHeight();        int cropWidth = w >= h ? h : w;// 裁切后所取的正方形区域边长        return Bitmap.createBitmap(bitmap, (bitmap.getWidth() - cropWidth) / 2,                (bitmap.getHeight() - cropWidth) / 2, cropWidth, cropWidth);    }    public static Bitmap getCircleBitmap(Bitmap bitmap) {//把图片裁剪成圆形        if (bitmap == null) {            return null;        }        bitmap = cropBitmap(bitmap);//裁剪成正方形        try {            Bitmap circleBitmap = Bitmap.createBitmap(bitmap.getWidth(),                    bitmap.getHeight(), Bitmap.Config.ARGB_8888);            Canvas canvas = new Canvas(circleBitmap);            final Paint paint = new Paint();            final Rect rect = new Rect(0, 0, bitmap.getWidth(),                    bitmap.getHeight());            final RectF rectF = new RectF(new Rect(0, 0, bitmap.getWidth(),                    bitmap.getHeight()));            float roundPx = 0.0f;            roundPx = bitmap.getWidth();            paint.setAntiAlias(true);            canvas.drawARGB(0, 0, 0, 0);            paint.setColor(Color.WHITE);            canvas.drawRoundRect(rectF, roundPx, roundPx, paint);            paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));            final Rect src = new Rect(0, 0, bitmap.getWidth(),                    bitmap.getHeight());            canvas.drawBitmap(bitmap, src, rect, paint);            return circleBitmap;        } catch (Exception e) {            return bitmap;        }    }}

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