Android getContentResolver().query 获取文件路径NullPointerException

针对Android 6.0系统测试如下：

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    Uri fileUri = data.getData();
    String[] filePathColumn = { MediaStore.Images.Media.DATA };

    Cursor cursor = getContentResolver().query(fileUri, filePathColumn, null, null, null);
    cursor.moveToFirst();
    String filePath = cursor.getString(cursor.getColumnIndex(filePathColumn[0]));
    cursor.close();
}

cursor的结果为null，查找原因，得到如下结论：

对于Android 6.0及后续版本，Uri的形式发生变化，此时如果要获取图像的路径，可以按照如下实现：

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    Uri fileUri = data.getData();
    String[] filePathColumn = { MediaStore.Images.Media.DATA };

    String filePath = null;
    if(Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
        Cursor cursor = getContentResolver().query(fileUri, filePathColumn, null, null, null);
        cursor.moveToFirst();
        filePath = cursor.getString(cursor.getColumnIndex(filePathColumn[0]));
        cursor.close();
    } else {
        filePath = fileUri.getPath();
    }
}