Android 图片处理方法大全

整理了一下目前Android开发中图片的各种处理方法：

Java代码

   /**
     * 使头像变灰
     * @param drawable
     */
    public static void porBecomeGrey(ImageView imageView, Drawable drawable) {
        drawable.mutate();
        ColorMatrix cm = new ColorMatrix();
        cm.setSaturation(0);
        ColorMatrixColorFilter cf = new ColorMatrixColorFilter(cm);
        drawable.setColorFilter(cf);
        imageView.setImageDrawable(drawable);
    }

 

Java 代码复制内容到剪贴板

Drawable drawable = new FastBitmapDrawable(bitmap);

Java 代码复制内容到剪贴板

public byte[] getBitmapByte(Bitmap bitmap){
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    bitmap.compress(Bitmap.CompressFormat.JPEG, 100, out);
    try {
        out.flush();
        out.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
    return out.toByteArray();
}


public Bitmap getBitmapFromByte(byte[] temp){
    if(temp != null){
        Bitmap bitmap = BitmapFactory.decodeByteArray(temp, 0, temp.length);
        return bitmap;
    }else{
        return null;
    }
}

Java 代码复制内容到剪贴板

/**
     * 将Drawable转化为Bitmap
     * @param drawable
     * @return
     */
    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;
    }

Java 代码复制内容到剪贴板

/**
    * 获取图片的倒影
    * @param bitmap
    * @return
    */
    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);
        paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));
        canvas.drawRect(0, height, width, bitmapWithReflection.getHeight()
                + reflectionGap, paint);
        return bitmapWithReflection;
    }

Java 代码复制内容到剪贴板

/**
    * 把图片变成圆角
    * @param bitmap 需要修改的图片
    * @param pixels 圆角的弧度
    * @return 圆角图片
    */
   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;
   }

Java 代码复制内容到剪贴板

/**
     * 缩放图片
     * @param bmp
     * @param width
     * @param height
     * @return
     */
    public static Bitmap PicZoom(Bitmap bmp, int width, int height) {
        int bmpWidth = bmp.getWidth();
        int bmpHeght = bmp.getHeight();
        Matrix matrix = new Matrix();
        matrix.postScale((float) width / bmpWidth, (float) height / bmpHeght);

        return Bitmap.createBitmap(bmp, 0, 0, bmpWidth, bmpHeght, matrix, true);
    }

Java 代码复制内容到剪贴板

/**
     * @param photoPath --原图路经
     * @param aFile     --保存缩图
     * @param newWidth  --缩图宽度
     * @param newHeight --缩图高度
     */
    public static boolean bitmapToFile(String photoPath, File aFile, int newWidth, int newHeight) {
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        // 获取这个图片的宽和高
        Bitmap bitmap = BitmapFactory.decodeFile(photoPath, options);
        options.inJustDecodeBounds = false;

        //计算缩放比
        options.inSampleSize = reckonThumbnail(options.outWidth, options.outHeight, newWidth, newHeight);

        bitmap = BitmapFactory.decodeFile(photoPath, options);

        try {
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            bitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos);
            byte[] photoBytes = baos.toByteArray();

            if (aFile.exists()) {
                aFile.delete();
            }
            aFile.createNewFile();

            FileOutputStream fos = new FileOutputStream(aFile);
            fos.write(photoBytes);
            fos.flush();
            fos.close();

            return true;
        } catch (Exception e1) {
            e1.printStackTrace();
            if (aFile.exists()) {
                aFile.delete();
            }
            Log.e("Bitmap To File Fail", e1.toString());
            return false;
        }
    }

Java 代码复制内容到剪贴板

/**
     * 计算缩放比
     * @param oldWidth
     * @param oldHeight
     * @param newWidth
     * @param newHeight
     * @return
     */
    public static int reckonThumbnail(int oldWidth, int oldHeight, int newWidth, int newHeight) {
        if ((oldHeight > newHeight && oldWidth > newWidth)
                || (oldHeight <= newHeight && oldWidth > newWidth)) {
            int be = (int) (oldWidth / (float) newWidth);
            if (be <= 1)
                be = 1;
            return be;
        } else if (oldHeight > newHeight && oldWidth <= newWidth) {
            int be = (int) (oldHeight / (float) newHeight);
            if (be <= 1)
                be = 1;
            return be;
        }

        return 1;
    }

Android边框圆角

XML/HTML 代码复制内容到剪贴板

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schema...android">
    <solid android:color="#000000" />
    <corners android:topLeftRadius="10dp"
                    android:topRightRadius="10dp"
                android:bottomRightRadius="10dp"
                android:bottomLeftRadius="10dp"/>
</shape>

解释：solid的表示填充颜色,为了简单，这里用的是黑色。

而corners则是表示圆角，注意的是这里bottomRightRadius是左下角而不是右下角，bottomLeftRadius右下角。 
当然上面的效果也可以像下面一样设置,如下: <corners android:radius="5dp" />  

 

原文来自：http://06peng.com/read.php/52.htm