Android 图像系列： 图片的压缩

private Runnable bitRunnable = new Runnable()
{
@Override
public void run()
{
// 在缓存文件夹中创建一个文件
String fileString = getSystemTime();
mImgName = fileString + ".jpg";
mUploadImage =  "SDCard/" + mImgName;

// 压缩图片
BitmapAccess baAccess = new BitmapAccess();
mLoadBitmap = baAccess.imageZoom(mLoadBitmap, 400.00);
//mLoadBitmap 是我从SD卡里拿到的图片
,压缩大小			try
{
FileOutputStream fos = null;
fos = new FileOutputStream(mUploadImage);
mLoadBitmap.compress(Bitmap.CompressFormat.JPEG, 30, fos);// 把数据写入文件
质量是百分之三十
// mBitmap.recycle();
} catch (FileNotFoundException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}

// 结束等待对话框
sendMessage(6);
}
};

public Bitmap imageZoom(Bitmap bitmap, double maxSize)
{
//获得图像输入输出流
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos);
byte[] b = baos.toByteArray();

//获得当前图像的容量大小(KB)
double mid = b.length / 1024;
if (mid > 100)		//如果该位图大小超过100KB
{
try
{
//将位图改成越 maxSize 这个大小
double i = mid / maxSize;
bitmap = Bitmap.createScaledBitmap(bitmap, (int) (bitmap
.getWidth() / Math.sqrt(i)),
(int) (bitmap.getHeight() / Math.sqrt(i)), true);
} catch (Exception e)
{
e.printStackTrace();
}

}

return bitmap;
}