安卓開發27：圖片處理工具類

import java.io.ByteArrayOutputStream;import java.io.File;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.ColorMatrix;import android.graphics.ColorMatrixColorFilter;import android.graphics.Paint;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;/** * 處理圖片的工具類. */public class imageTool {    public static final int LEFT = 0;    public static final int RIGHT = 1;    public static final int TOP = 3;    public static final int BOTTOM = 4;    /** */    /**     * 圖片去色,返回灰階圖片     *      * @param bmpOriginal     *            傳入的圖片     * @return 去色後的圖片     */    public static Bitmap toGrayscale(Bitmap bmpOriginal) {        int width, height;        height = bmpOriginal.getHeight();        width = bmpOriginal.getWidth();        Bitmap bmpGrayscale = Bitmap.createBitmap(width, height,                Bitmap.Config.RGB_565);        Canvas c = new Canvas(bmpGrayscale);        Paint paint = new Paint();        ColorMatrix cm = new ColorMatrix();        cm.setSaturation(0);        ColorMatrixColorFilter f = new ColorMatrixColorFilter(cm);        paint.setColorFilter(f);        c.drawBitmap(bmpOriginal, 0, 0, paint);        return bmpGrayscale;    }    /** */    /**     * 去色同時加圓角     *      * @param bmpOriginal     *            原圖     * @param pixels     *            圓角弧度     * @return 修改後的圖片     */    public static Bitmap toGrayscale(Bitmap bmpOriginal, int pixels) {        return toRoundCorner(toGrayscale(bmpOriginal), pixels);    }    /** */    /**     * 把圖片變成圓角     *      * @param bitmap     *            需要修改的圖片     * @param pixels     *            圓角的弧度     * @return 圓角圖片     */    public static Bitmap toRoundCorner(Bitmap bitmap, int pixels) {        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);        final float roundPx = pixels;        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;    }    /** */    /**     * 使圓角功能支援BitampDrawable     *      * @param bitmapDrawable     * @param pixels     * @return     */    public static BitmapDrawable toRoundCorner(BitmapDrawable bitmapDrawable,            int pixels) {        Bitmap bitmap = bitmapDrawable.getBitmap();        bitmapDrawable = new BitmapDrawable(toRoundCorner(bitmap, pixels));        return bitmapDrawable;    }    /**     * 讀取路徑中的圖片，然後將其轉化為縮放後的bitmap     *      * @param path     */    public static void saveBefore(String path) {        BitmapFactory.Options options = new BitmapFactory.Options();        options.inJustDecodeBounds = true;        // 擷取這個圖片的寬和高        Bitmap bitmap = BitmapFactory.decodeFile(path, options); // 此時返回bm為空白        options.inJustDecodeBounds = false;        // 計算縮放比        int be = (int) (options.outHeight / (float) 200);        if (be <= 0)            be = 1;        options.inSampleSize = 2; // 圖片長寬各縮小二分之一        // 重新讀入圖片，注意這次要把options.inJustDecodeBounds 設為 false哦        bitmap = BitmapFactory.decodeFile(path, options);        int w = bitmap.getWidth();        int h = bitmap.getHeight();        System.out.println(w + " " + h);        // savePNG_After(bitmap,path);        saveJPGE_After(bitmap, path);    }    /**     * 儲存圖片為PNG     *      * @param bitmap     * @param name     */    public static void savePNG_After(Bitmap bitmap, String name) {        File file = new File(name);        try {            FileOutputStream out = new FileOutputStream(file);            if (bitmap.compress(Bitmap.CompressFormat.PNG, 100, out)) {                out.flush();                out.close();            }        } catch (FileNotFoundException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }    }    /**     * 儲存圖片為JPEG     *      * @param bitmap     * @param path     */    public static void saveJPGE_After(Bitmap bitmap, String path) {        File file = new File(path);        try {            FileOutputStream out = new FileOutputStream(file);            if (bitmap.compress(Bitmap.CompressFormat.JPEG, 100, out)) {                out.flush();                out.close();            }        } catch (FileNotFoundException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }    }    /**     * 浮水印     *      * @param bitmap     * @return     */    public static Bitmap createBitmapForWatermark(Bitmap src, Bitmap watermark) {        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);// 建立一個新的和SRC長度寬度一樣的位元影像        Canvas cv = new Canvas(newb);        // draw src into        cv.drawBitmap(src, 0, 0, null);// 在 0，0座標開始畫入src        // draw watermark into        cv.drawBitmap(watermark, w - ww + 5, h - wh + 5, null);// 在src的右下角畫入浮水印        // save all clip        cv.save(Canvas.ALL_SAVE_FLAG);// 儲存        // store        cv.restore();// 儲存        return newb;    }    /**     * 圖片合成     *      * @return     */    public static Bitmap potoMix(int direction, Bitmap... bitmaps) {        if (bitmaps.length <= 0) {            return null;        }        if (bitmaps.length == 1) {            return bitmaps[0];        }        Bitmap newBitmap = bitmaps[0];        // newBitmap = createBitmapForFotoMix(bitmaps[0],bitmaps[1],direction);        for (int i = 1; i < bitmaps.length; i++) {            newBitmap = createBitmapForFotoMix(newBitmap, bitmaps[i], direction);        }        return newBitmap;    }    private static Bitmap createBitmapForFotoMix(Bitmap first, Bitmap second,            int direction) {        if (first == null) {            return null;        }        if (second == null) {            return first;        }        int fw = first.getWidth();        int fh = first.getHeight();        int sw = second.getWidth();        int sh = second.getHeight();        Bitmap newBitmap = null;        if (direction == LEFT) {            newBitmap = Bitmap.createBitmap(fw + sw, fh > sh ? fh : sh,                    Config.ARGB_8888);            Canvas canvas = new Canvas(newBitmap);            canvas.drawBitmap(first, sw, 0, null);            canvas.drawBitmap(second, 0, 0, null);        } else if (direction == RIGHT) {            newBitmap = Bitmap.createBitmap(fw + sw, fh > sh ? fh : sh,                    Config.ARGB_8888);            Canvas canvas = new Canvas(newBitmap);            canvas.drawBitmap(first, 0, 0, null);            canvas.drawBitmap(second, fw, 0, null);        } else if (direction == TOP) {            newBitmap = Bitmap.createBitmap(sw > fw ? sw : fw, fh + sh,                    Config.ARGB_8888);            Canvas canvas = new Canvas(newBitmap);            canvas.drawBitmap(first, 0, sh, null);            canvas.drawBitmap(second, 0, 0, null);        } else if (direction == BOTTOM) {            newBitmap = Bitmap.createBitmap(sw > fw ? sw : fw, fh + sh,                    Config.ARGB_8888);            Canvas canvas = new Canvas(newBitmap);            canvas.drawBitmap(first, 0, 0, null);            canvas.drawBitmap(second, 0, fh, null);        }        return newBitmap;    }    /**     * 將Bitmap轉換成指定大小     *      * @param bitmap     * @param width     * @param height     * @return     */    public static Bitmap createBitmapBySize(Bitmap bitmap, int width, int height) {        return Bitmap.createScaledBitmap(bitmap, width, height, true);    }    /**     * Drawable 轉 Bitmap     *      * @param drawable     * @return     */    public static Bitmap drawableToBitmapByBD(Drawable drawable) {        BitmapDrawable bitmapDrawable = (BitmapDrawable) drawable;        return bitmapDrawable.getBitmap();    }    /**     * Bitmap 轉 Drawable     *      * @param bitmap     * @return     */    public static Drawable bitmapToDrawableByBD(Bitmap bitmap) {        Drawable drawable = new BitmapDrawable(bitmap);        return drawable;    }    /**     * byte[] 轉 bitmap     *      * @param b     * @return     */    public static Bitmap bytesToBimap(byte[] b) {        if (b.length != 0) {            return BitmapFactory.decodeByteArray(b, 0, b.length);        } else {            return null;        }    }    /**     * bitmap 轉 byte[]     *      * @param bm     * @return     */    public static byte[] bitmapToBytes(Bitmap bm) {        ByteArrayOutputStream baos = new ByteArrayOutputStream();        bm.compress(Bitmap.CompressFormat.PNG, 100, baos);        return baos.toByteArray();    }}