如何获取手机和存储卡上的图片
/**
* 通过uri获取文件的绝对路径
* @param uri
* @return
*/
protected String getAbsoluteImagePath(Uri uri)
{
// can post image
String [] proj={MediaStore.Images.Media.DATA};
Cursor cursor = managedQuery( uri,
proj, // Which columns to return
null, // WHERE clause; which rows to return (all rows)
null, // WHERE clause selection arguments (none)
null); // Order-by clause (ascending by name)

int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();

return cursor.getString(column_index);
}