根据Uri查询图片路径

/**根据Uri获取图片的路径，包含文件名和扩展名*/
String path = null;
Uri uri = data.getData();
String[] proj = {MediaStore.Images.Media.DATA};
ContentResolver cr = this.getContentResolver();
Cursor cursor = cr.query(uri, proj, null, null, null);
int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
//最后根据索引值获取图片路径
path = cursor.getString(column_index);