Question

我现在正尝试按照以下行为在我的片段中设置一个ExpandableListView。我有三个带有CheckedTextViews的组：

品牌（大众，奥迪，西亚特...）
类型（马球，高尔夫球，A3，A2，伊维萨岛...）
颜色（红色，绿色，蓝色...）

在扩展一个组时，其他组应关闭（已管理）。单击一组中的一个孩子时，它显示为已选中（已管理）。

这是我现在被困住的地方

在单击同一组的另一个孩子时，应取消选择其他项目。同样，例如

之后，下一个组也会自动打开

如果选择了第1组的孩子1并单击了第1组的孩子2
应取消选择子级1，并且
第2组应该扩展
现在您必须在第2组中选择一个孩子（这也会取消选择该组中的其他选定孩子）
第3组打开
选择第3组的子级->所有组均折叠

将来，将从服务器中动态检索Arraylist。此后，应该有一个行为来仅显示第一组中所选品牌的车牌。也许您也有解决此问题的想法。

我的代码是

package de.tubs.cs.ibr.androidlab.flexcarpool.ui;

import android.content.Context;
import android.graphics.Color;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.text.TextUtils;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.CheckedTextView;
import android.widget.ExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

import de.tubs.cs.ibr.androidlab.flexcarpool.R;

public class ConfigureCarFragment extends Fragment implements View.OnClickListener {

    ExpandableListView expandableListView;
    ExpandableListAdapter expandableListAdapter;
    List<String> expandableListTitle;
    HashMap<String, List<String>> expandableListDetail;
    private int lastExpandedPosition = -1;



    private String[] mBrand;
    private String[] mTypes;
    private String[] mColors;

    private Button configure_car;
    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_car_configure, container, false);
        setHasOptionsMenu(true);
        mColors = getResources().getStringArray(R.array.colors);
        mBrand = getResources().getStringArray(R.array.brands);
        mTypes = getResources().getStringArray(R.array.types);

        expandableListView = (ExpandableListView) view.findViewById(R.id.expandableListView);

        ((MainActivity) getActivity())
                .setActionBarTitle(getString(R.string.profil));

        expandableListDetail = ConfigureCarData.getData();
        expandableListTitle = new ArrayList<String>(expandableListDetail.keySet());
        expandableListAdapter = new ConfigureCarAdapter( (MainActivity)getContext(), expandableListTitle, expandableListDetail);
        expandableListView.setAdapter(expandableListAdapter);


        expandableListView.setAdapter(expandableListAdapter);
        expandableListView.setOnGroupExpandListener(new ExpandableListView.OnGroupExpandListener() {

            @Override

            public void onGroupExpand(int groupPosition) {

                    if (lastExpandedPosition != -1
                            && groupPosition != lastExpandedPosition) {
                        expandableListView.collapseGroup(lastExpandedPosition);
                    }
                    lastExpandedPosition = groupPosition;
                            }
        });

        expandableListView.setOnGroupCollapseListener(new ExpandableListView.OnGroupCollapseListener() {

            @Override
            public void onGroupCollapse(int groupPosition) {

            }
        });

        expandableListView.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
            @Override
            public boolean onChildClick(ExpandableListView parent, View v,
                                        int groupPosition, int childPosition, long id) {


                long childcount = expandableListAdapter.getChildrenCount(groupPosition);

                CheckedTextView checkbox = (CheckedTextView) v.findViewById(R.id.expandedListItem);

                if (checkbox.isChecked()) {

                    checkbox.setCheckMarkDrawable(null);
                    checkbox.setChecked(false);
                } else {

                    checkbox.setCheckMarkDrawable(R.drawable.ic_check_black_24dp);
                    checkbox.setChecked(true);
                }

                return true;
            }
        });

        configure_car = view.findViewById(R.id.configure_car);


        configure_car.setOnClickListener(this);

        ((MainActivity) getActivity())
                .setActionBarTitle(getString(R.string.configure_car));


        return view;
    }

    public void onPrepareOptionsMenu(Menu menu) {
        menu.clear();
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.configure_car:
                ((MainActivity) getActivity()).getSupportFragmentManager().popBackStack();

        }
    }

    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        getActivity().setTitle(R.string.login);
    }

 }

适配器的代码是

package de.tubs.cs.ibr.androidlab.flexcarpool.ui;

import java.util.HashMap;
import java.util.List;
import android.content.Context;
import android.graphics.Typeface;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.TextView;

import de.tubs.cs.ibr.androidlab.flexcarpool.R;


public class ConfigureCarAdapter extends BaseExpandableListAdapter{


        private Context context;
        private List<String> expandableListTitle;
        private HashMap<String, List<String>> expandableListDetail;

        public  ConfigureCarAdapter(Context context, List<String> expandableListTitle,
                                           HashMap<String, List<String>> expandableListDetail) {
            this.context = context;
            this.expandableListTitle = expandableListTitle;
            this.expandableListDetail = expandableListDetail;

        }

        @Override
        public Object getChild(int listPosition, int expandedListPosition) {
            return this.expandableListDetail.get(this.expandableListTitle.get(listPosition))
                    .get(expandedListPosition);
        }

        @Override
        public long getChildId(int listPosition, int expandedListPosition) {
            return expandedListPosition;
        }

        @Override
        public View getChildView(int listPosition, final int expandedListPosition,
                                 boolean isLastChild, View convertView, ViewGroup parent) {
            final String expandedListText = (String) getChild(listPosition, expandedListPosition);
            if (convertView == null) {
                LayoutInflater layoutInflater = (LayoutInflater) this.context
                        .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                convertView = layoutInflater.inflate(R.layout.list_item, null);
            }
            TextView expandedListTextView = (TextView) convertView
                    .findViewById(R.id.expandedListItem);
            expandedListTextView.setText(expandedListText);
            return convertView;
        }

        @Override
        public int getChildrenCount(int listPosition) {
            return this.expandableListDetail.get(this.expandableListTitle.get(listPosition))
                    .size();
        }

        @Override
        public Object getGroup(int listPosition) {
            return this.expandableListTitle.get(listPosition);
        }

        @Override
        public int getGroupCount() {
            return this.expandableListTitle.size();
        }

        @Override
        public long getGroupId(int listPosition) {
            return listPosition;
        }

        @Override
        public View getGroupView(int listPosition, boolean isExpanded,
                                 View convertView, ViewGroup parent) {
            String listTitle = (String) getGroup(listPosition);
            if (convertView == null) {
                LayoutInflater layoutInflater = (LayoutInflater) this.context.
                        getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                convertView = layoutInflater.inflate(R.layout.list_group, null);
            }
            TextView listTitleTextView = (TextView) convertView
                    .findViewById(R.id.listTitle);
            listTitleTextView.setTypeface(null, Typeface.BOLD);
            listTitleTextView.setText(listTitle);
            return convertView;
        }

        @Override
        public boolean hasStableIds() {
            return false;
        }

        @Override
        public boolean isChildSelectable(int listPosition, int expandedListPosition) {
            return true;
        }
}

感谢您的帮助，我退出了新手，请耐心等待！

Answer 1

尝试以下代码：

fragment_car_configure.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="match_parent">

<Button
    android:id="@+id/configure_car"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="Button" />

<Button
    android:id="@+id/btConfirmCar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:visibility="gone"
    android:text="Confirm Car"/>

<ExpandableListView
    android:id="@+id/expandableListView"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
</ExpandableListView>

</LinearLayout>

list_group1.xml：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="match_parent"
android:padding="8dp"
android:background="@color/colorPrimary"
android:layout_height="wrap_content">

<TextView
    android:id="@+id/listTitle"
    android:paddingLeft="?android:attr/expandableListPreferredItemPaddingLeft"
    android:textSize="16dp"
    android:textColor="@android:color/white"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />

<TextView
    android:id="@+id/selectedChild"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:textColor="#ff0000"
    android:gravity="right"
    android:text="Test"/>

</LinearLayout>

list_item1.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="55dip">

<CheckedTextView
    android:id="@+id/expandedListItem"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:checkMark="?android:attr/listChoiceIndicatorMultiple"
    android:paddingBottom="5dp"
    android:paddingLeft="?android:attr/expandableListPreferredChildPaddingLeft"
    android:paddingTop="5dp"
    android:text="Child"
    android:textSize="16dip" />

</LinearLayout>

ConfigureCarFragment.java：

public class ConfigureCarFragment extends Fragment implements View.OnClickListener {
ExpandableListView expandableListView;
ConfigureCarAdapter expandableListAdapter;
List<String> expandableListTitle;
LinkedHashMap<String, List<String>> expandableListDetail;
private int lastExpandedPosition = -1;

private String[] mBrand;
private String[] mTypes;
private String[] mColors;

private Button configure_car;
private Button btConfirmCar;

@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment_car_configure, container, false);
    setHasOptionsMenu(true);
    mBrand = getResources().getStringArray(R.array.brands);
    mTypes = getResources().getStringArray(R.array.types);
    mColors = getResources().getStringArray(R.array.colors);

    expandableListView = view.findViewById(R.id.expandableListView);

    //((MainActivity) getActivity()).setActionBarTitle(getString(R.string.profil));

    //expandableListDetail = ConfigureCarData.getData();
    expandableListDetail = getData();
    expandableListTitle = new ArrayList<>(expandableListDetail.keySet());
    expandableListAdapter = new ConfigureCarAdapter( (MainActivity)getContext(), expandableListTitle, expandableListDetail);
    expandableListView.setAdapter(expandableListAdapter);

    expandableListView.setOnGroupExpandListener(new ExpandableListView.OnGroupExpandListener() {
        @Override
        public void onGroupExpand(int groupPosition) {
            if (lastExpandedPosition != -1 && groupPosition != lastExpandedPosition) {
                expandableListView.collapseGroup(lastExpandedPosition);
            }
            lastExpandedPosition = groupPosition;
        }
    });
    expandableListView.setOnGroupCollapseListener(new ExpandableListView.OnGroupCollapseListener() {
        @Override
        public void onGroupCollapse(int groupPosition) {}
    });
    expandableListView.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
        @Override
        public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {
            expandableListAdapter.updateWithChildSelected(groupPosition, childPosition);
            if(groupPosition < expandableListAdapter.getGroupCount() - 1){
                expandableListView.expandGroup(groupPosition + 1);
                btConfirmCar.setVisibility(View.GONE);
            }else{
                expandableListView.collapseGroup(expandableListAdapter.getGroupCount() - 1);
                btConfirmCar.setVisibility(View.VISIBLE);
            }
            return true;
        }
    });

    configure_car = view.findViewById(R.id.configure_car);
    configure_car.setOnClickListener(this);
    //((MainActivity) getActivity()).setActionBarTitle(getString(R.string.configure_car));

    btConfirmCar = view.findViewById(R.id.btConfirmCar);
    btConfirmCar.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            showConfirmedCar("Your confirmed car configuration is:\n");
        }
    });

    expandableListView.expandGroup(0);
    return view;
}

private void showConfirmedCar(String header){
    String msg = header;
    for(int i=0; i<expandableListAdapter.getGroupCount(); i++) {
        msg += expandableListAdapter.getGroup(i) + ": " +
                expandableListAdapter.getChild(i, expandableListAdapter.checkedChildPosition[i]) + "\n";
    }
    Toast.makeText(getContext(), msg, Toast.LENGTH_LONG).show();
}

public void onPrepareOptionsMenu(Menu menu) {
    menu.clear();
}

@Override
public void onClick(View v) {
    switch (v.getId()) {
        case R.id.configure_car:
            ((MainActivity) getActivity()).getSupportFragmentManager().popBackStack();
    }
}

@Override
public void onAttach(Context context) {
    super.onAttach(context);
    //getActivity().setTitle(R.string.login);
}

private LinkedHashMap<String, List<String>> getData(){
    LinkedHashMap<String, List<String>> listHashMap = new LinkedHashMap<>();
    List<String> list;
    list = new ArrayList<>();
    list.addAll(Arrays.asList(mBrand));
    listHashMap.put("Brand", list);
    list = new ArrayList<>();
    list.addAll(Arrays.asList(mTypes));
    listHashMap.put("Type", list);
    list = new ArrayList<>();
    list.addAll(Arrays.asList(mColors));
    listHashMap.put("Color", list);
    return listHashMap;
}

}

ConfigureCarAdapter.java：

public class ConfigureCarAdapter extends BaseExpandableListAdapter {
private Context context;
private List<String> expandableListTitle;
private HashMap<String, List<String>> expandableListDetail;
public int[] checkedChildPosition;  // Save checked child position for each group.

public ConfigureCarAdapter(Context context, List<String> expandableListTitle,
                            HashMap<String, List<String>> expandableListDetail) {
    this.context = context;
    this.expandableListTitle = expandableListTitle;
    this.expandableListDetail = expandableListDetail;
    checkedChildPosition = new int[expandableListTitle.size()];
    resetCheckedChildPosition(0);
}

@Override
public String getChild(int listPosition, int expandedListPosition) {
    return this.expandableListDetail.get(this.expandableListTitle.get(listPosition)).get(expandedListPosition);
}

@Override
public long getChildId(int listPosition, int expandedListPosition) {
    return expandedListPosition;
}

@Override
public View getChildView(int listPosition, int expandedListPosition, boolean isLastChild, View convertView, ViewGroup parent) {
    String expandedListText = getChild(listPosition, expandedListPosition);
    if (convertView == null) {
        LayoutInflater layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = layoutInflater.inflate(R.layout.list_item1, null);
    }
    CheckedTextView expandedListTextView = convertView.findViewById(R.id.expandedListItem);
    expandedListTextView.setText(expandedListText);

    // Checked the view if this child is checked.
    expandedListTextView.setChecked(checkedChildPosition[listPosition] == expandedListPosition);
    return convertView;
}

@Override
public int getChildrenCount(int listPosition) {
    return this.expandableListDetail.get(this.expandableListTitle.get(listPosition)).size();
}

@Override
public String getGroup(int listPosition) {
    return this.expandableListTitle.get(listPosition);
}

@Override
public int getGroupCount() {
    return this.expandableListTitle.size();
}

@Override
public long getGroupId(int listPosition) {
    return listPosition;
}

@Override
public View getGroupView(int listPosition, boolean isExpanded, View convertView, ViewGroup parent) {
    String listTitle = getGroup(listPosition);
    if (convertView == null) {
        LayoutInflater layoutInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = layoutInflater.inflate(R.layout.list_group1, null);
    }
    TextView listTitleTextView = convertView.findViewById(R.id.listTitle);
    listTitleTextView.setTypeface(null, Typeface.BOLD);
    listTitleTextView.setText(listTitle);

    TextView selectedChild = convertView.findViewById(R.id.selectedChild);
    if(checkedChildPosition[listPosition] != -1){
        // if group have selected child, get child and display inside header.
        selectedChild.setText(getChild(listPosition, checkedChildPosition[listPosition]));
    }else{
        selectedChild.setText("");
    }
    return convertView;
}

@Override
public boolean hasStableIds() {
    return false;
}

@Override
public boolean isChildSelectable(int listPosition, int expandedListPosition) {
    return true;
}

// Reset checked childs starts from group "from" to last group.
private void resetCheckedChildPosition(int from) {
    if(from < checkedChildPosition.length)
        for(int i=from; i<checkedChildPosition.length; i++) checkedChildPosition[i] = -1;
}

// Update adapter when a child is selected.
public void updateWithChildSelected(int group, int child){
    resetCheckedChildPosition(group);
    checkedChildPosition[group] = child;
    notifyDataSetChanged();
}

}

希望有帮助！

取消选中ExpandableListView组中的所有CheckedTextViews

1 个答案: