工作中用到的图片处理工具类，简单写下来，以便备用！

public class BitmapUtils {

/**

* 图像背景圆角处理

* bitmap要处理的图片 roundPx 图片弯角的圆度一般是5到10之间

*/

public static Bitmap getRoundedCornerBitmap(Bitmap bitmap, float roundPx) {

// 创建与原图大小一样的bitmap文件，Config.ARGB_8888根据情况可以改用其它的

Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Config.ARGB_8888);

// 实例画布，绘制的bitmap将保存至output中

Canvas canvas = new Canvas(output);

final int color = 0xff424242;//写自己需要的颜色值

final Paint paint = new Paint();

final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());

final RectF rectF = new RectF(rect);

paint.setAntiAlias(true);

canvas.drawARGB(0, 0, 0, 0);

paint.setColor(color);

canvas.drawRoundRect(rectF, roundPx, roundPx, paint);

paint.setXfermode(new PorterDuffXfermode(android.graphics.PorterDuff.Mode.SRC_IN));

canvas.drawBitmap(bitmap, rect, rect, paint);

bitmap.recycle();

bitmap = null;

return output;

}

/**

* bitmap缩放

* width要缩放的宽度 height要缩放的高度

*/

public static Bitmap getBitmapDeflation(Bitmap bitmap, int width, int height, boolean recycle) {

if (null == bitmap) {

return null;

}

float scaleWidth = 0f;

float scaleHeight = 0f;

// 获取bitmap宽高

int bitmapWidth = bitmap.getWidth();

int bitmapHeight = bitmap.getHeight();

// 计算缩放比,图片的宽高小于指定的宽高则不缩放

if (width < bitmapWidth) {

scaleWidth = ((float) width) / bitmapWidth;

} else {

scaleWidth = 1.00f;

}

if (height < bitmapHeight) {

scaleHeight = ((float) height) / bitmapHeight;

} else {

scaleHeight = 1.00f;

}

Matrix matrix = new Matrix();

matrix.postScale(scaleWidth, scaleHeight);

Bitmap newBitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmapWidth, bitmapHeight, matrix, true);

if (recycle && !bitmap.isRecycled()) {

bitmap.recycle();

}

bitmap = null;

return newBitmap;

}

/**

*

* 方法概述：进入图片的大小与质量压缩，用于区分大小图片

*/

public static Bitmap getCompressedImage(String srcPath) {

BitmapFactory.Options newOpts = new BitmapFactory.Options();

// 开始读入图片，此时把options.inJustDecodeBounds 设回true了

newOpts.inPreferredConfig = Bitmap.Config.RGB_565;

newOpts.inPurgeable = true;

newOpts.inJustDecodeBounds = true;

FileInputStream is = null;

try {

is = new FileInputStream(srcPath);

} catch (FileNotFoundException e) {

e.printStackTrace();

}

Bitmap bitmap = BitmapFactory.decodeStream(is, null, newOpts);// 此时返回bm为空

newOpts.inJustDecodeBounds = false;

int w = newOpts.outWidth;

int h = newOpts.outHeight;

// 现在主流手机比较多是800*480分辨率，所以高和宽我们设置为

float hh = 130f;// 这里设置高度为800f

float ww = 130f;// 这里设置宽度为480f

// 缩放比。由于是固定比例缩放，只用高或者宽其中一个数据进行计算即可

int be = 1;// be=1表示不缩放

if (w > h && w > ww) {// 如果宽度大的话根据宽度固定大小缩放

be = (int) (newOpts.outWidth / ww);

} else if (w < h && h > hh) {// 如果高度高的话根据宽度固定大小缩放

be = (int) (newOpts.outHeight / hh);

}

if (be <= 0) {

be = 1;

}

newOpts.inSampleSize = be;// 设置缩放比例

// 重新读入图片，注意此时已经把options.inJustDecodeBounds 设回false了

bitmap = BitmapFactory.decodeFile(srcPath, newOpts);

if (bitmap != null) { return compressImageSize(bitmap, 8);// 压缩好比例大小后再进行质量压缩

}

return null;

}

/**

*

* 方法概述：图片质量压缩

*/

protected static Bitmap compressImageSize(Bitmap image, int size) {

if (image == null)

return image;

ByteArrayOutputStream baos = new ByteArrayOutputStream();

image.compress(Bitmap.CompressFormat.JPEG, 100, baos);// 质量压缩方法，这里10表示不压缩，把压缩后的数据存放到baos中

int options = 100;

while (baos.toByteArray().length / 1000 > size && options / 3 > 0) { // 循环判断如果压缩后图片是否大于10kb,大于继续压缩

baos.reset();// 重置baos即清空baos

image.compress(Bitmap.CompressFormat.JPEG, options, baos);// 这里压缩options%，把压缩后的数据存放到baos中

options -= options / 3;// 每次都减少30%

}

ByteArrayInputStream isBm = new ByteArrayInputStream(baos.toByteArray());// 把压缩后的数据baos存放到ByteArrayInputStream中

Bitmap bitmap = BitmapFactory.decodeStream(isBm, null, null);// 把ByteArrayInputStream数据生成图片

return bitmap;

}

/**

*

* 方法概述：保存图片

*/

public static String saveBitmapWithName(String path, String bitName, Bitmap mBitmap) {

File f = new File(path + bitName + ".png");

String url = path + bitName + ".png";

try {

f.createNewFile();

} catch (IOException e) {

System.out.println("文件创建出错");

}

FileOutputStream fOut = null;

try {

fOut = new FileOutputStream(f);

} catch (FileNotFoundException e) {

System.out.println(" 创建文件流失败");

e.printStackTrace();

}

mBitmap.compress(Bitmap.CompressFormat.PNG, 100, fOut);

try {

fOut.flush();

} catch (IOException e) {

e.printStackTrace();

}

try {

fOut.close();

} catch (IOException e) {

e.printStackTrace();

}

return url;

}

/**

*

* 方法概述：根据传入参数保存图片

*/

public static boolean saveImageTo(Bitmap photo, String spath) {

try {

BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(spath, false));

photo.compress(Bitmap.CompressFormat.PNG, 100, bos);

bos.flush();

bos.close();

} catch (Exception e) {

e.printStackTrace();

return false;

}

return true;

}

}