片段中未显示动态视图：android

Question

我有一个带有子 LinearLayout 的 ScrollView。我通过单独的 View 方法以编程方式将 TextViews 和 NumberPickers 添加到 LinearLayout。但是，单击包含 ScrollView 的选项卡时，不会显示动态对象。

这是我的代码：

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

  View rootview = inflater.inflate(R.layout.activity_settings_tab, container, false);
  super.onCreate(savedInstanceState);
  myDb = new DatabaseHelper(getContext());

  rootview.findViewById(R.id.scroll_config);
  viewFunds();
  return rootview;
}

这是我提到的动态添加对象到 LinearLayout 的单独方法：

public View viewFunds(View rootview) {

  ScrollView scrollView = new ScrollView(getActivity());
  scrollView.findViewById(R.id.scroll_config);
  LinearLayout linearLayout = new LinearLayout(getActivity());
  linearLayout.findViewById(R.id.ll_config);
  //final View linearLayout = getActivity().findViewById(R.id.ll_config);
  linearLayout.removeAllViews(); //clear layout first - LINE WITH ISSUE
  linearLayout.setGravity(Gravity.CENTER);

  LinearLayout.LayoutParams lp2 = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
  LinearLayout.LayoutParams lp3 = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);

  //create dynamic objects inside scrollview and dynamic linear layout - horizontal
  for (int i = 0; i < res2.getCount(); i++) {
    LinearLayout llh = new LinearLayout(getActivity());
    llh.setOrientation(LinearLayout.HORIZONTAL);
    LinearLayout.LayoutParams lp_llh = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
    llh.setLayoutParams(lp_llh);

    linearLayout.addView(llh);

    NumberPicker numberPicker = new NumberPicker(getActivity());
    numberPicker.setMinValue(0);
    numberPicker.setMaxValue(100);
    LinearLayout.LayoutParams lp_np = new LinearLayout.LayoutParams(70, LinearLayout.LayoutParams.WRAP_CONTENT);
    numberPicker.setLayoutParams(lp_np);
    numberPicker.setGravity(Gravity.CENTER_HORIZONTAL);

    //showMessage("value",res2.getString(3));
    numberPicker.setValue(Integer.parseInt(res2.getString(2))); //
    TextView textView = new TextView(getActivity());
    textView.setText( /*textArray[i] + " " +*/ res2.getString(1));


    llh.addView(textView);
    linearLayout.addView(numberPicker);

  }
  return scrollView;
}

我做错了什么？

Answer 1

你正在使用片段你必须找到参考片段根视图的视图还有你下面的语句什么都不做我会建议你通过android基本组件

 rootview.findViewById(R.id.scroll_config);

要解决问题，请执行以下操作

public View viewFunds(View rootview) {

  ScrollView scrollView = (ScrollView)rootview.findViewById(R.id.scroll_config);//considering scroll_config is scroll view in xml
  LinearLayout linearLayout =(LinearLayout)rootview.findViewById(R.id.ll_config);//considering ll_config is LinearLayout  in xml

  linearLayout.removeAllViews(); //clear layout first - LINE WITH ISSUE
  linearLayout.setGravity(Gravity.CENTER);

  LinearLayout.LayoutParams lp2 = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
  LinearLayout.LayoutParams lp3 = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);

  //create dynamic objects inside scrollview and dynamic linear layout - horizontal
  for (int i = 0; i < res2.getCount(); i++) {
    LinearLayout llh = new LinearLayout(getActivity());
    llh.setOrientation(LinearLayout.HORIZONTAL);
    LinearLayout.LayoutParams lp_llh = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
    llh.setLayoutParams(lp_llh);

    linearLayout.addView(llh);

    NumberPicker numberPicker = new NumberPicker(getActivity());
    numberPicker.setMinValue(0);
    numberPicker.setMaxValue(100);
    LinearLayout.LayoutParams lp_np = new LinearLayout.LayoutParams(70, LinearLayout.LayoutParams.WRAP_CONTENT);
    numberPicker.setLayoutParams(lp_np);
    numberPicker.setGravity(Gravity.CENTER_HORIZONTAL);

    //showMessage("value",res2.getString(3));
    numberPicker.setValue(Integer.parseInt(res2.getString(2))); //
    TextView textView = new TextView(getActivity());
    textView.setText( /*textArray[i] + " " +*/ res2.getString(1));


    llh.addView(textView);
    linearLayout.addView(numberPicker);///chek in which layou you want to add numberPicker

  }
}

并在 oncreateview 中

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

  View rootview = inflater.inflate(R.layout.activity_settings_tab, container, false);
  super.onCreate(savedInstanceState);
  myDb = new DatabaseHelper(getContext());

  viewFunds(rootview);
  return rootview;
}

还要接受android培训https://developer.android.com/training/index.html

片段中未显示动态视图：android

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