如何在ExpandableListView中检查/取消选中CheckedTextView（子项）项目？

问题描述 投票：2回答：1

我的设计：我已经为我的ExpandableListView创建了一个自定义适配器（SignalsExpandableListAdapter)和一个CheckedTextView。

public class SignalsExpandableListAdapter extends BaseExpandableListAdapter {
private Context context;
private List<String> listDataHandler;
private HashMap<String,List<String>> listHashMap;

public SignalsExpandableListAdapter(Context context, List<String> listDataHandler, HashMap<String, List<String>> listHashMap) {
    this.context = context;
    this.listDataHandler = listDataHandler;
    this.listHashMap = listHashMap;
}

然后，将数据填充到HashMap和List中的片段中，如下所示。这很好。我可以在ExpandableListView中看到子元素和父元素。 

ArrayList<List<String[]>> deviceMList = new ArrayList<>();
final List<String[]> mList = new ArrayList<>();
deviceMList.add(mList);

[我要寻找的东西：当我选择任何一个孩子（可以是多个孩子）时，我想使用CheckedTextView勾选该选择。而且，当我选择任何选中的子项时，我也想取消选中。 （一个简单的选中/取消选中设计）。同样，当选择任何子项时，将调用另一个函数进行绘图。这就是我卡住的地方。每次我选择一个孩子时，随机的多个孩子checkedTextViews也会显示为已选中，而不仅仅是我选择的一个。

经过一些搜索，我尝试了3次尝试来克服此问题，并仅检查我选择的孩子。但是看来我的尝试都没有奏效。我不确定发生了什么。我的尝试在下面提到。我对此表示感谢。

Attempt 1：试图使片段内部为true

listAdapter = new SignalsExpandableListAdapter(context,signalsListDataHeader,signalsListHash);
signalsExpandableListView.setAdapter(listAdapter);
signalsExpandableListView.setChoiceMode(AbsListView.CHOICE_MODE_MULTIPLE);
//tickCheckboxes();

signalsExpandableListView.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
    @Override
    public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {
        CheckedTextView sensorCheckedView  = (CheckedTextView) v.findViewById(R.id.sensorsCheckedTextView);
        if(!mService.mPlotManager.ifPropertyExist(deviceMList.get(groupPosition).get(childPosition))) {
            sensorCheckedView.setChecked(true);
            try {
                if(Plot==null) {
                    Log.e(LOG_TAG, "Plot is null!");
                }
                mService.mPlotManager.addSignal(deviceMList.get(groupPosition).get(childPosition), Plot);
            } catch (Exception e) {
                Log.e(LOG_TAG, "Error! + e);
                e.printStackTrace();
            }
        } else {
            mService.mPlotManager.removeSignal(deviceMList.get(groupPosition).get(childPosition));
            //signalsExpandableListView.setItemChecked(childPosition,false);
            sensorCheckedView.setChecked(false);
        }
        return true;
    }
});

Attempt 2：创建一个不同的函数，并在Fragment中调用它。创建的函数如下，尝试1上方注释了函数调用。

//loop through groups and then children
public void tickCheckboxes() {
    //CheckedTextView sensorCheckedView  = (CheckedTextView) signalsExpandableListView.findViewById(R.id.sensorsCheckedTextView);
    for (int i = 0; i < deviceMList.size(); i++) {
        for (int j = 0; j < deviceMList.get(i).size(); j++) {
            if (mService.mPlotManager.ifPropertyExist(deviceMList.get(i).get(j))) {
                signalsExpandableListView.setItemChecked(j, true);
                //sensorCheckedView.setChecked(true);
            } else {
                signalsExpandableListView.setItemChecked(j, false);
                //sensorCheckedView.setChecked(false);
            }
        }
    }
}

Attempt 3：使用ExpandableListView适配器访问子元素。我更新了getChildView()方法，如下所示。 

@Override
public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View view, ViewGroup parent) {
    final String childText = (String) getChild(groupPosition,childPosition);
    if(view == null){
        LayoutInflater inflater = (LayoutInflater) this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        view = inflater.inflate(R.layout.sensors_list_items,null);
    }
    CheckedTextView txtListChild = (CheckedTextView) view.findViewById((R.id.sensorsCheckedTextView));
    txtListChild.setText(childText);
    txtListChild.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if (txtListChild.isChecked()) {
                txtListChild.setChecked(false);
            } else {
                txtListChild.setChecked(true);
            }
        }
    });
    return view;
}

@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
    return true;
}

列出项目xml：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <CheckedTextView
        android:id="@+id/sensorsCheckedTextView"
        android:layout_width="match_parent"
        android:layout_height="?android:attr/listPreferredItemHeightSmall"
        android:textAppearance="?android:attr/textAppearanceListItemSmall"
        android:gravity="center_vertical"
        android:checkMark="?android:attr/listChoiceIndicatorMultiple"
        android:paddingLeft="?android:attr/expandableListPreferredChildPaddingLeft"
        android:textColor="@color/black"
        android:paddingTop="5dp"
        android:paddingBottom="5dp"/>


</LinearLayout>

Group xml：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">
    <TextView
        android:id="@+id/deviceNameTextView"
        android:layout_width="match_parent"
        android:layout_height="?android:attr/listPreferredItemHeightSmall"
        android:textAppearance="?android:attr/textAppearanceListItemSmall"
        android:gravity="center_vertical"
        android:text="Device Name"
        android:paddingTop="5dp"
        android:paddingBottom="5dp"
        android:background="@color/colorAccent"
        android:textColor="@color/colorPrimary"
        android:paddingLeft="?android:attr/expandableListPreferredItemPaddingLeft"/>
</LinearLayout>

我在寻找II：对于检查/取消检查，我借助下面提到的answer像尝试4中一样修改了适配器。我无法实时看到checked标记。当我单击一个孩子时，我想向上/向下滚动以直观地看到选中标记。与取消选中相同。它很奇怪。似乎需要一种“刷新”才能实时查看检查/取消检查状态。我将不胜感激关于如何摆脱这一点的任何建议。

谢谢。

尝试4：修改的适配器。这适用于检查/取消选中，但无法实时直观地看到它。 

public class SignalsExpandableListAdapter extends BaseExpandableListAdapter {
    private Context context;
    private List<String> listDataHandler;
    private HashMap<String,List<String>> listHashMap;
    private MService mService;
    private ArrayList<List<String[]>> deviceMList ;

    public SignalsExpandableListAdapter(Context context, List<String> listDataHandler, HashMap<String, List<String>> listHashMap,mService service, ArrayList<List<String[]>> dMList ) {
        this.context = context;
        this.listDataHandler = listDataHandler;
        this.listHashMap = listHashMap;
        this.mService = service;
        this.deviceMList =dMList;
    }

@Override
public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View view, ViewGroup parent) {
    final String childText = (String) getChild(groupPosition,childPosition);
    if(view == null){
        LayoutInflater inflater = (LayoutInflater) this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        view = inflater.inflate(R.layout.sensors_list_items,null);
    }
    CheckedTextView txtListChild = (CheckedTextView) view.findViewById((R.id.sensorsCheckedTextView));
    txtListChild.setText(childText);

if(mService.mPlotManager.ifPropertyExist(deviceMList.get(groupPosition).get(childPosition))) {
        txtListChild.setChecked(true);
    } else {
        txtListChild.setChecked(false);
    }
    return view;
}
java android android-fragments expandablelistview checkedtextview
1个回答
1
投票

我假设您的mService具有名为PlottingService的类，然后尝试对适配器进行以下更改：

public class SignalsExpandableListAdapter extends BaseExpandableListAdapter {
    private Context context;
    private List<String> listDataHandler;
    private HashMap<String,List<String>> listHashMap;
    private PlottingService mService;

    public SignalsExpandableListAdapter(Context context, List<String> listDataHandler, HashMap<String, List<String>> listHashMap, PlottingService ps) {
        this.context = context;
        this.listDataHandler = listDataHandler;
        this.listHashMap = listHashMap;
        this.mService = ps;
    }

    @Override
    public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View view, ViewGroup parent) {
        final String childText = (String) getChild(groupPosition,childPosition);
        if(view == null){
            LayoutInflater inflater = (LayoutInflater) this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            view = inflater.inflate(R.layout.sensors_list_items,null);
        }
        CheckedTextView txtListChild = (CheckedTextView) view.findViewById((R.id.sensorsCheckedTextView));
        txtListChild.setText(childText);

        // Always set check state according to data.
        if(mService.mPlotManager.ifPropertyExist(deviceMList.get(groupPosition).get(childPosition))) {
            txtListChild.setChecked(true);
        } else {
            txtListChild.setChecked(false);
        }

        return view;
    }

在片段内部，尝试1，仅更改：listAdapter = new SignalsExpandableListAdapter(context,signalsListDataHeader,signalsListHash);至listAdapter = new SignalsExpandableListAdapter(context,signalsListDataHeader,signalsListHash, mService);

希望有帮助！

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