*

* @param image

* @return

*/

private static Bitmap compressImage(Bitmap image) {

ByteArrayOutputStream baos = new ByteArrayOutputStream();

image.compress(Bitmap.CompressFormat.JPEG, 100, baos);

int options = 100;

while (baos.toByteArray().length / 1024 > 100) {

baos.reset();

image.compress(Bitmap.CompressFormat.JPEG, options, baos);

options -= 10;

}

ByteArrayInputStream isBm = new ByteArrayInputStream(baos.toByteArray());

Bitmap bitmap = BitmapFactory.decodeStream(isBm, null, null);

return bitmap;

}

/**

* 图片按比例大小压缩方法（根据路径获取图片并压缩）

*

* @param srcPath

* @return

*/

private static Bitmap getImage(String srcPath) {

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

newOpts.inJustDecodeBounds = true;

Bitmap bitmap = BitmapFactory.decodeFile(srcPath, 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 = 800f;// 这里设置高度为800f

float ww = 480f;// 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);

return compressImage(bitmap);// 压缩好比例大小后再进行质量压缩

}

/**

* 将压缩的bitmap保存到SDCard卡临时文件夹，用于上传

*

* @param filename

* @param bit

* @return

*/

private static String saveMyBitmap(String filename, Bitmap bit) {

String baseDir = Environment.getExternalStorageDirectory().getAbsolutePath()+"/laopai/";

String filePath = baseDir + filename;

File dir = new File(baseDir);

if (!dir.exists()) {

dir.mkdir();

}

File f = new File(filePath);

try {

f.createNewFile();

FileOutputStream fOut = null;

fOut = new FileOutputStream(f);

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

fOut.flush();

fOut.close();

} catch (IOException e1) {

e1.printStackTrace();

}

return filePath;

}

/**

* 压缩上传路径

* @param path

* @return

*/

public static String compressImageUpload(String path) {

String filename = path.substring(path.lastIndexOf("/") + 1);

Bitmap image = getImage(path);

return saveMyBitmap(filename, image);

}

/**

* 清除缓存文件

*/

public static void deleteCacheFile(){

File file = new File(Environment.getExternalStorageDirectory().getAbsolutePath()+"/laopai/");

RecursionDeleteFile(file);

}

清除缓存文件

*/

public static void deleteCacheFile(){

File file = new File(Environment.getExternalStorageDirectory().getAbsolutePath()+"/laopai/");

RecursionDeleteFile(file);

}