Android通过Uri获取文件的路径的方法

public static String getRealPathFromURI(Uri contentUri, Context mContext) {
	    String[] proj = { MediaStore.Images.Media.DATA };
	    CursorLoader loader = new CursorLoader(mContext, contentUri, proj, null, null, null);
	    Cursor cursor = loader.loadInBackground();
	    int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
	    cursor.moveToFirst();
	    return cursor.getString(column_index);
	}