Question

我查看了类似的问题但尚未找到答案。在从SQL数据库获取数据后，我最终将添加每个View，但是现在，我只是尝试添加一组视图，以便我可以使我的布局正常工作。我有一个带有片段管理器的主要活动，可以让我的标签流动并加载得很好，所以我认为我不需要在这里提供该代码。

以下是片段的代码：

public class EconFragment extends Fragment {

private ViewGroup container;


public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

    populateQuestions(container, inflater);
    return inflater.inflate(R.layout.econfragment, container, false);

}


public void onPause() {
    super.onPause();
    container.removeAllViews();
}

private void populateQuestions(ViewGroup v, LayoutInflater inflater) {
    container = v;
    int count = 10;
    int runner = 0;


    while (runner < count) {
    View question = inflater.inflate(R.layout.question, null);
    question.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT));
    container.addView(question, runner);
    runner++;
    }
}
}

因此，虽然这应该在容器中填充多个Question.xml视图，但我只有一个显示。值得注意的是，我可以观察到跑步者增加到计数时的延迟，但同样只会出现一个问题视图。当我改变时，我在TableLayout周围得到很多空指针，所以我删除了那部分。

最终，EconFragment的xml有一个表格布局，其中ScrollView还有另一个TableLayout，questionContainer。

我原本希望将每个问题视图添加到questionContainer中，但这会给我带来各种麻烦。我认为这与在populateQuestions()中返回语句之前调用onCreateView()有点相关？

Answer 1

以下是我解决问题的方法。它没有实现我想要的SQL dB访问，它只是一个填充while循环和一个虚拟的字符串数组来制作Table Rows。我几乎已经通过SQL dB实现了登录/注册，一旦完成，通过SQL填充这些tablerow应该不是一个大问题。

public class EconFragment extends Fragment {


    private TableLayout questionContainer;
    static int pos = 0;
    private String[] titles = {"The first title ", "hallo1","hallo2", "hallo3",
            "hallo4", "hallo5","hallo6", "hallo7","hallo8", "hallo9"};

    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        Log.d("Econ", "onCreateView");

        return inflater.inflate(R.layout.econfragment, container, false);
    }

    public void onResume() {
        super.onResume();


        LayoutInflater inflater = (LayoutInflater) getActivity().
        getSystemService(Context.LAYOUT_INFLATER_SERVICE);

        questionContainer = (TableLayout) getActivity().findViewById(R.id.questionContainer);



        //these lines are my first attempt to try and get the questions to repopulate after returning
        //from pressing back - as of yet, they don't repopulate the screen:
        //View econFragment = inflater.inflate(R.layout.econfragment, null);
        //container.addView(econFragment);

        int leftMargin=5;
        int topMargin=5;
        int rightMargin=5;
        int bottomMargin=5;
        while (pos < 10) {
        View question = inflater.inflate(R.layout.question, null);
        question.setId(pos);
        TextView title = (TextView) question.findViewById(R.id.questionTextView);
        title.setText(titles[pos]);
        Button charts = (Button) question.findViewById(R.id.chartsButton);
        charts.setId(pos);
        charts.setOnClickListener(chartsListener);
        TableRow tr = (TableRow) question;
        TableLayout.LayoutParams trParams = new TableLayout.LayoutParams(
                TableLayout.LayoutParams.MATCH_PARENT,
                TableLayout.LayoutParams.WRAP_CONTENT);
        trParams.setMargins(leftMargin, topMargin, rightMargin, bottomMargin);
        tr.setLayoutParams(trParams);

        questionContainer.addView(tr);
        pos++;
        }
        Log.d("Econ", "onResume");
    }

在运行时期间在片段内向TableLayout添加视图

1 个答案: