图片处理Java工具类(缩放,圆角,倒影)

import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.Canvas;
import android.graphics.LinearGradient;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.PorterDuff.Mode;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.Shader.TileMode;

/**
 * 图片处理工具类(缩放,圆角,倒影)
 *
 */
public class ImageUtils {
    /**
     * 图片缩放
     *
     * @param pBitmap
     * @param pW
     * @param pH
     * @return
     */
    public static Bitmap zoomBitmap(Bitmap pBitmap, int pW, int pH) {

        int _width = pBitmap.getWidth();// 获取原图的宽
        int _heigth = pBitmap.getHeight();// 获取原图的高

        // 获取缩放比
        float _ScaleW = (float) pW / _width;
        float _ScaleH = (float) pH / _heigth;

        Matrix _Matrix = new Matrix();// 创建Matrix矩阵对象

        _Matrix.setScale(_ScaleW, _ScaleH);// 设置宽高的缩放比

        return Bitmap.createBitmap(pBitmap, 0, 0, _width, _heigth, _Matrix,
                true);// 对截原图的0,0坐标到_width,_heigth的图片进行_Matrix处理
    }

    /**
     * 图片圆角
     *
     * @param pBitmap
     * @param pRoundpx
     * @return
     */
    public static Bitmap RoundedCornerBitmap(Bitmap pBitmap, float pRoundpx) {

        Bitmap _NewBitmap = Bitmap.createBitmap(pBitmap.getWidth(),
                pBitmap.getHeight(), Config.ARGB_8888); // 创建图片画布大小
        Canvas _Canvas = new Canvas(_NewBitmap); // 创建画布
        _Canvas.drawARGB(0, 0, 0, 0); // 设置画布透明
        Paint _Paint = new Paint(); // 创建画笔
        _Paint.setAntiAlias(true); // 抗锯齿
        _Paint.setColor(0xff000000);// 画笔颜色透明

        // 画与原图片大小一致的圆角矩形
        Rect _Rect = new Rect(0, 0, pBitmap.getWidth(), pBitmap.getHeight());
        RectF _RectF = new RectF(_Rect);
        _Canvas.drawRoundRect(_RectF, pRoundpx, pRoundpx, _Paint);

        _Paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));// 设置下面张图片与上面张图片的交互模式
        _Canvas.drawBitmap(pBitmap, _Rect, _Rect, _Paint);// 画原图到画布
        return _NewBitmap;
    }

    /**
     * 图片倒影
     *
     * @param pBitmap
     * @return
     */
    public static Bitmap ReflectionImageWithOrigin(Bitmap pBitmap) {
        // 创建等宽,高+高/5的画布
        Bitmap _NewBitmap = Bitmap
                .createBitmap(pBitmap.getWidth(),
                        pBitmap.getHeight() + pBitmap.getHeight() / 5,
                        Config.ARGB_8888);
        Canvas _Canvas = new Canvas(_NewBitmap);

        _Canvas.drawBitmap(pBitmap, 0, 0, null);// 画上原图

        // 原图翻转,
        Matrix _Matrix = new Matrix();
        _Matrix.preScale(1, -1);
        Bitmap _Bitmap = Bitmap.createBitmap(pBitmap, 0, 0, pBitmap.getWidth(),
                pBitmap.getHeight(), _Matrix, true);

        // 在剩余画布上画上翻转图
        _Canvas.drawBitmap(_Bitmap, 0, pBitmap.getHeight(), null);
        Paint _Paint = new Paint();

        // 实现图片的渐变效果
        LinearGradient shader = new LinearGradient(0, pBitmap.getHeight(), 0,
                _NewBitmap.getHeight(), 0x70ffffff, 0x00ffffff, TileMode.CLAMP);
        _Paint.setShader(shader);
        _Paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));
        _Canvas.drawRect(0, pBitmap.getHeight(), pBitmap.getWidth(),
                _NewBitmap.getHeight(), _Paint);
        return _NewBitmap;
    }

}
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