Android 图片工具类整理

1.将图片转换成圆形

 /**     * 转换图片成圆形     * @param bitmap 传入Bitmap对象     * @return     */     public static Bitmap toRoundBitmap(Bitmap bitmap) {         int width = bitmap.getWidth();         int height = bitmap.getHeight();         float roundPx;         float left,top,right,bottom,dst_left,dst_top,dst_right,dst_bottom;         if (width <= height) {         roundPx = width / 2;         top = 0;         bottom = width;         left = 0;         right = width;         height = width;         dst_left = 0;         dst_top = 0;         dst_right = width;         dst_bottom = width;         } else {         roundPx = height / 2;         float clip = (width - height) / 2;         left = clip;         right = width - clip;         top = 0;         bottom = height;         width = height;         dst_left = 0;         dst_top = 0;         dst_right = height;         dst_bottom = height;         }         Bitmap output = Bitmap.createBitmap(width,         height, Config.ARGB_8888);         Canvas canvas = new Canvas(output);         final int color = 0xff424242;         final Paint paint = new Paint();         final Rect src = new Rect((int)left, (int)top, (int)right, (int)bottom);         final Rect dst = new Rect((int)dst_left, (int)dst_top, (int)dst_right, (int)dst_bottom);         final RectF rectF = new RectF(dst);         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, src, dst, paint);         return output;     }

2.将图片缩小后变成圆形（图片本身会被修改）

/**     * 处理图片(缩小、变成圆形)     * @return 返回处理后的图片     */    public static Bitmap HandlePhotoFromCamera(){        BitmapFactory.Options op = new BitmapFactory.Options();        op.inSampleSize = 6; // 这个数字越大,图片大小越小.        // 设置图片的大小        Bitmap bitMap = BitmapFactory.decodeFile(BitmapUtil.PHOTONAME);        int width = bitMap.getWidth();        int height = bitMap.getHeight();        // 设置想要的大小        int newWidth = 250;        int newHeight = 250;        // 计算缩放比例        float scaleWidth = ((float) newWidth) / width;        float scaleHeight = ((float) newHeight) / height;        // 取得想要缩放的matrix参数        Matrix matrix = new Matrix();        matrix.postScale(scaleWidth, scaleHeight);        // 得到新的图片        //bitMap = Bitmap.createBitmap(bitMap, 0, 0, width, height,        //      matrix, true);        // canvas.drawBitmap(bitMap, 0, 0, paint)        Bitmap pic = null;        pic = BitmapUtil.toRoundBitmap(BitmapFactory.decodeFile(BitmapUtil.PHOTONAME, op));//将图片变成圆形        FileOutputStream b = null;        ;        try {            b = new FileOutputStream(BitmapUtil.PHOTONAME);        } catch (FileNotFoundException e) {            e.printStackTrace();        }        if (pic != null) {            pic.compress(Bitmap.CompressFormat.JPEG, 30, b);        }        return pic;    }

3 bitmap与string转换以及base64编码

    //// 将Bitmap转换成字符串      public String bitmaptoString(Bitmap bitmap) {           String string = null;          ByteArrayOutputStream bStream = new ByteArrayOutputStream();          bitmap.compress(CompressFormat.PNG, 100, bStream);          byte[] bytes = bStream.toByteArray();          string = Base64.encodeToString(bytes, Base64.DEFAULT);          return string;      }    public Bitmap stringtoBitmap(String string) {                 // 将字符串转换成Bitmap类型          Bitmap bitmap = null;          try {                  byte[] bitmapArray;                  bitmapArray = Base64.decode(string, Base64.DEFAULT);                  bitmap = BitmapFactory.decodeByteArray(bitmapArray, 0,                                  bitmapArray.length);          } catch (Exception e) {                 e.printStackTrace();          }          return bitmap;      }      //将bytep数组按base64 编码    public static String bytesToBase64(byte[] data) {        if (data == null) {            return null;        }        return Base64.encodeToString(data, Base64.DEFAULT);    }

4 根据本地Uri获取bitmap对象后处理

private Bitmap getBitmapFromUri(Uri uri) {        Bitmap bitmap = null;        try {            BitmapFactory.Options options = new BitmapFactory.Options();            options.inJustDecodeBounds = true;            bitmap = BitmapFactory.decodeStream(getContentResolver()                    .openInputStream(uri), null, options);            int picWidth = options.outWidth;            int picHeight = options.outHeight;            WindowManager windowManager = getWindowManager();            Display display = windowManager.getDefaultDisplay();            int screenWidth = display.getWidth();            int screenHeight = display.getHeight();            options.inSampleSize = 1;            if (picWidth > picHeight) {                if (picWidth > screenWidth)                    options.inSampleSize = picWidth / screenWidth;            } else {                if (picHeight > screenHeight)                    options.inSampleSize = picHeight / screenHeight;            }            options.inJustDecodeBounds = false;            bitmap = BitmapFactory.decodeStream(getContentResolver()                    .openInputStream(uri), null, options);        } catch (Exception e) {            e.printStackTrace();            return null;        }        return bitmap;    }

5.将图片压缩后转换成byte数组

ByteArrayOutputStream baos = new ByteArrayOutputStream();fianBitmap.compress(Bitmap.CompressFormat.PNG, 100, baos);// 100不压缩byte[] bitmapByte = baos.toByteArray();

之后转换成base64编码即可上传到服务器

6.从字节数组中获取bitmap

public static Bitmap getBitmapFromBytes(byte[] data) {        if (data == null) {            return null;        }        return BitmapFactory.decodeByteArray(data, 0, data.length);// 从字节数组解码位图    }

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