Android 如何在GridView中获取TextView项

我有一个用户可以选择的数字列表。一旦选择了一个号码，我想保存该号码的选定状态，并能够在应用程序重新启动时恢复这些号码的状态

当前，调用

onCreateView

时，我很难让GridView中的项恢复其状态。我尝试调用

gridView.getChildCount（）

，我注意到它返回0。我读过很多关于类似问题的帖子，并尝试过他们的答案，但都没有成功。我已经做了几天了

Fragment1.java：

public class Fragment1 extends Fragment implements OnItemClickListener {

public static final String ARG_SECTION_NUMBER = "section_number";

private static final int START_NUM = 1;
private static final int END_NUM = 59;
public static boolean[] num_select = new boolean[END_NUM - START_NUM + 1];

private static GridView gridView;
private static NumberAdapter adapter;

public Fragment1() {
}

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

    View rootView = inflater.inflate(R.layout.fragment_1, container, false);

    gridView = (GridView) rootView.findViewById(R.id.gridview_number);

    adapter = new NumberAdapter(getActivity(), START_NUM, END_NUM);
    gridView.setAdapter(adapter);
    //gridView.setChoiceMode(GridView.CHOICE_MODE_MULTIPLE);

    gridView.setOnItemClickListener((OnItemClickListener) this);

    // ************* I NEED TO BE ABLE TO RESTORE THE NUMBER STATE HERE *******
//restoreNumbers();

    return rootView;
}   

@Override
public void onItemClick(AdapterView<?> parent, View v, int position, long id) {

num_select[position] = !num_select[position];

    if (num_select[position])
    {
        v.getBackground().setColorFilter(Color.rgb(210, 230, 230), 
    }
    else
    {
        v.getBackground().clearColorFilter();           
    }       
}

---

}多亏了这一点，我才找到了答案。 基本上，您需要创建一个addOnGlobalLayoutListener，并在GridView绘制完成后调用getChildAt。如果调用太早，它将返回null视图

ViewTreeObserver vto = tv.getViewTreeObserver();
vto.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
    @Override
    public void onGlobalLayout() {
        TextView textView = (TextView) gridView.getChildAt(i);
        textView.getBackground().setColorFilter(Color.rgb(210, 230, 230), PorterDuff.Mode.MULTIPLY);
    }
});

ViewTreeObserver vto = tv.getViewTreeObserver();
vto.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
    @Override
    public void onGlobalLayout() {
        TextView textView = (TextView) gridView.getChildAt(i);
        textView.getBackground().setColorFilter(Color.rgb(210, 230, 230), PorterDuff.Mode.MULTIPLY);
    }
});