Fatal编程技术网
  • android/
  • 在Android中，我希望一次只能扩展一个父列表

在Android中，我希望一次只能扩展一个父列表

android

在Android中，我希望一次只能扩展一个父列表,android,expandablelistview,Android,Expandablelistview,我想一次只扩展父列表中的一项，我的onCreate代码如下。（它可以按照我的要求工作，但一次只允许打开一个父级的方法不起作用） public void onCreate（Bundle savedInstanceState）{ 试一试{ super.onCreate（savedInstanceState）； setContentView（R.layout.main）； 最终SimpleExpandableListAdapter解释适配器= 新的SimpleExpandableListAdapter

我想一次只扩展父列表中的一项，我的onCreate代码如下。（它可以按照我的要求工作，但一次只允许打开一个父级的方法不起作用）

public void onCreate（Bundle savedInstanceState）{
试一试{
super.onCreate（savedInstanceState）；
setContentView（R.layout.main）；
最终SimpleExpandableListAdapter解释适配器=
新的SimpleExpandableListAdapter(
//对于1级屏幕
这
createGroupList（），//用于创建父列表的方法创建组列表。
R.layout.group_行，//引用XML文件名。
新字符串[]{“Group Item”}，//字符串数组包含一个键，该键引用了所有父列表项。
new int[]{R.id.row_name}，//引用每个组项的父XML.id的id。-键下的数据进入此文本视图。
createChildList（），//用于创建子LST的方法。childData描述第二级条目。
R.layout.child_行，//XMLFILE NAME表示子列表。layout表示子级条目（第二级）。
新字符串[]{“subitem”}，//HASHMAP中子项的键。要显示的childData映射中的键。
TEXTVIEW的新int[]{R.id.grp_child}//XML id。上面键下的数据进入这些TEXTVIEW。
);
setListAdapter（expListAdapter）；//在列表中设置适配器。
//**这是我不知道如何编写的代码：**
列表=（ExpandableListView）findViewById（R.id.row\u name）；
list.setAdapter（expListAdapter）；
list.setGroupIndicator（空）；
list.setOnGroupExpandListener（新的OnGroupExpandListener（）{
public void onGroupExpand（int groupPosition）{
int len=expListAdapter.getGroupCount（）；
对于（int i=0；i
我理解上面的代码，但是，我不使用ExpandableListView，我正在使用expandablelist的布局将我的程序引用到我的.xml文件中。因此，我不知道如何将上述内容应用到我的程序中

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
 <ExpandableListView android:id="@+id/list"
               android:layout_width="fill_parent" 
               android:layout_height="fill_parent"
               android:background="@drawable/bkg"/>

     <TextView android:id="@+id/android:empty"
               android:layout_width="fill_parent" 
               android:layout_height="fill_parent"
               android:text="No items"/>
</LinearLayout>
我不知道如何应用的方法如下：

                    list = (ExpandableListView) findViewById(R.id.row_name);
            list.setAdapter( expListAdapter);
            list.setGroupIndicator(null);

            list.setOnGroupExpandListener(new OnGroupExpandListener() {
                    public void onGroupExpand(int groupPosition) {
                    int len = expListAdapter.getGroupCount();
                    for (int i = 0; i < len; i++) {
                        if (i != groupPosition) {
                            list.collapseGroup(i);
                        }
                    }
                }
            });

list=（ExpandableListView）findViewById（R.id.row\u name）；
list.setAdapter（expListAdapter）；
list.setGroupIndicator（空）；
list.setOnGroupExpandListener（新的OnGroupExpandListener（）{
public void onGroupExpand（int groupPosition）{
int len=expListAdapter.getGroupCount（）；
对于（int i=0；i
1） 如何将“列表”引用到我的expandablelist活动

列表在类中定义为
private ExpandableListView列表

我现在没有任何错误，但该方法不起作用


非常感谢您的帮助
 通过创建一个名为list的公共explist变量，然后通过以下调用将其引用到视图中的适配器，问题得以解决


list = getExpandableListView(); 


由于此原因，之前的扩展方法正在使应用程序崩溃。在中重新引用list.collapsegroup后，它工作正常


public void onGroupExpand(int groupPosition) { 
                    System.out.println("GROUP LISTENER WORKS?");
                    if(adptr=="expListAdapter"){
                        int len = expListAdapter.getGroupCount();
                        //System.out.println(len);
                        for (int i = 0; i < len; i++) {
                            if (i != groupPosition) {
                            list.collapseGroup(i);
                            }
                        }

                    }
                    else if(adptr=="expListAdapter2"){
                        int len = expListAdapter2.getGroupCount();
                        for (int i = 0; i < len; i++) {
                            if (i != groupPosition) {
                            list.collapseGroup(i);
                            }
                        }
                        //System.out.println(len);
                    }
                    else if(adptr=="expListAdapter3"){
                        int len = expListAdapter3.getGroupCount();
                        for (int i = 0; i < len; i++) {
                            if (i != groupPosition) {
                            list.collapseGroup(i);
                            }
                        }

                    }
            }



public void onGroupExpand（int-groupPosition）{
System.out.println（“组侦听器工作？”）；
如果（adptr==“expListAdapter”）{
int len=expListAdapter.getGroupCount（）；
//系统输出打印项次（len）；
对于（int i=0；i
我认为一个简单的解决方案是实现一个适配器来处理您感兴趣的任何事件


public class MyExpandableListAdapter extends SimpleExpandableListAdapter {

  public Activity mActivity;

  public MyExpandableListAdapter([ARGS USED IN QUESTION], Activity activity) {super([ARGS USED IN QUESTIONS]); mActivity = activity; }

  // then just override the method
  public void onGroupExpanded(int groupPosition) {
    int len = super.getGroupCount();
    ExpandableListView list = (ExpandableListView) mActivity.findViewById(R.id.list);
    for (int i = 0; i < len; i++) {
        if (i != groupPosition) {
            list.collapseGroup(i);
        }
    }
  }
}




使用更新的解决方案进行更新


mExpandableList.setOnGroupExpandListener(new OnGroupExpandListener() {
    // Keep track of previous expanded parent
    int previousGroup = -1;

    @Override
    public void onGroupExpand(int groupPosition) {
        // Collapse previous parent if expanded.
        if ((previousGroup != -1) && (groupPosition != previousGroup)) {
            mExpandableList.collapseGroup(previousGroup);
        }
        previousGroup = groupPosition;
    }
});



@覆盖
已扩展的公共组（int-groupPosition）{
super.onGroupExpanded（groupPosition）；
int len=getGroupCount（）；
对于（int i=0；i
修改了Iram的答案：
这样您就可以重新打开同一组


// Listview Group expanded listener
    expListView.setOnGroupExpandListener(new OnGroupExpandListener() {

        @Override
        public void onGroupExpand(int groupPosition) {
            if (prevouriousExpandedGroupNumber != -1 && prevouriousExpandedGroupNumber != groupPosition) {
                expListView.collapseGroup(prevouriousExpandedGroupNumber);
            }
            prevouriousExpandedGroupNumber = groupPosition;
        }
    });



最简单的方法

您可以在运行


// Declare variable 
private static int prev = -1;
// and OnGroupExpandListener implement


 mExpandableList.setOnGroupExpandListener(new OnGroupExpandListener() {

            @Override
            public void onGroupExpand(int groupPosition) {

                if(prev!=-1)
                {

                    mExpandableList.collapseGroup(prev);    

                }
                prev=groupPosition;
            }
        });



mExpandableList.setOnGroupExpandListener(new OnGroupExpandListener() {
    // Keep track of previous expanded parent
    int previousGroup = -1;

    @Override
    public void onGroupExpand(int groupPosition) {
        // Collapse previous parent if expanded.
        if ((previousGroup != -1) && (groupPosition != previousGroup)) {
            mExpandableList.collapseGroup(previousGroup);
        }
        previousGroup = groupPosition;
    }
});



    @Override
    public void onGroupExpanded(int groupPosition) {
        super.onGroupExpanded(groupPosition);
        int len = getGroupCount();

        for (int i = 0; i < len; i++) {
            if (i != groupPosition) {
               expListView.collapseGroup(i);
            }
        }
    }



// Listview Group expanded listener
    expListView.setOnGroupExpandListener(new OnGroupExpandListener() {

        @Override
        public void onGroupExpand(int groupPosition) {
            if (prevouriousExpandedGroupNumber != -1 && prevouriousExpandedGroupNumber != groupPosition) {
                expListView.collapseGroup(prevouriousExpandedGroupNumber);
            }
            prevouriousExpandedGroupNumber = groupPosition;
        }
    });



 expandableList.setOnGroupExpandListener(new OnGroupExpandListener() {
        int previousGroup = -1;

        @Override
        public void onGroupExpand(int groupPosition) {
            if(groupPosition != previousGroup)
                expandableList.collapseGroup(previousGroup);
            previousGroup = groupPosition;
        }
    });



private static int prev = -1;
// and OnGroupExpandListener implement


 mExpandableList.setOnGroupExpandListener(new OnGroupExpandListener() {

            @Override
            public void onGroupExpand(int groupPosition) {

                if(prev!=-1 && prev!=groupPosition )
                {

                    mExpandableList.collapseGroup(prev);    

                }
                prev=groupPosition;
            }
        });



item 1 has clicked(opened) 
item 1 has clicked(closed) 
item 1 has clicked(Not opening. because prev has same position so the item is opened and collapsed immediatly ) 



item 1 has clicked(opened) 
item 1 has clicked(closed) 
item 1 has clicked(opened) 



package com.keshav.myexpandablelistviewexampleworkinginactivity;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ExpandableListView;
import android.widget.ExpandableListView.OnChildClickListener;
import android.widget.ExpandableListView.OnGroupClickListener;
import android.widget.ExpandableListView.OnGroupCollapseListener;
import android.widget.ExpandableListView.OnGroupExpandListener;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

public class MainActivity extends Activity {

    ExpandableListAdapter listAdapter;
    ExpandableListView expListView;
    List<String> listDataHeader;
    HashMap<String, List<String>> listDataChild;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // tODO get the listview
        expListView = (ExpandableListView) findViewById(R.id.lvExp);

        // TODO preparing list data
        prepareListData();

        listAdapter = new ExpandableListAdapter(this, listDataHeader, listDataChild);

        // setting list adapter
        expListView.setAdapter(listAdapter);

        // Listview Group click listener
        expListView.setOnGroupClickListener(new OnGroupClickListener() {

            @Override
            public boolean onGroupClick(ExpandableListView parent, View v,
                                        int groupPosition, long id) {
                Toast.makeText(getApplicationContext(),
                        "Group Clicked " + listDataHeader.get(groupPosition),
                        Toast.LENGTH_SHORT).show();
                return false;
            }

        });

        // Listview Group expanded listener
        expListView.setOnGroupExpandListener(new OnGroupExpandListener() {

            // TODO Colapse Here Using this... in android
            int previousGroup = -1;
            boolean flag = false;

            @Override
            public void onGroupExpand(int groupPosition) {

                Log.e("keshav", "onGroupClick is -> " + groupPosition);

                Toast.makeText(getApplicationContext(),
                        listDataHeader.get(groupPosition) + " Expanded",
                        Toast.LENGTH_SHORT).show();

                if (groupPosition != previousGroup && flag) {
                    expListView.collapseGroup(previousGroup);
                }
                previousGroup = groupPosition;

                flag = true;

            }
        });


        // Listview Group collasped listener
        expListView.setOnGroupCollapseListener(new OnGroupCollapseListener() {

            @Override
            public void onGroupCollapse(int groupPosition) {
                Toast.makeText(getApplicationContext(),
                        listDataHeader.get(groupPosition) + " Collapsed",
                        Toast.LENGTH_SHORT).show();

            }
        });


        // Todo Listview on child click listener
        expListView.setOnChildClickListener(new OnChildClickListener() {

            @Override
            public boolean onChildClick(ExpandableListView parent, View v,
                                        int groupPosition, int childPosition, long id) {
                // TODO Auto-generated method stub
                Toast.makeText(
                        getApplicationContext(),
                        listDataHeader.get(groupPosition)
                                + " : "
                                + listDataChild.get(
                                listDataHeader.get(groupPosition)).get(
                                childPosition), Toast.LENGTH_SHORT)
                        .show();
                return false;
            }
        });
    }

    /*
     * Preparing the list data
     */
    private void prepareListData() {
        listDataHeader = new ArrayList<String>();
        listDataChild = new HashMap<String, List<String>>();

        // Adding child data
        listDataHeader.add("Months");
        listDataHeader.add("Top 250");
        listDataHeader.add("Now Showing");
        listDataHeader.add("Coming Soon..");


        // Adding child data
        List<String> weeks = new ArrayList<String>();
        weeks.add("Sunday");
        weeks.add("Monday");
        weeks.add("Tuesday");
        weeks.add("Wednesday");
        weeks.add("Thursday");
        weeks.add("Friday");
        weeks.add("Saturday");


        // Adding child data
        List<String> top250 = new ArrayList<String>();
        top250.add("Om Shanti Om");
        top250.add("Badshah");
        top250.add("Bahubali Part 1");
        top250.add("Carry on Jatta");
        top250.add("Sholey");
        top250.add("Mard");
        top250.add("Dewwar");


        List<String> nowShowing = new ArrayList<String>();
        nowShowing.add("Bahubali");
        nowShowing.add("Kabali");
        nowShowing.add("Luckky Di Unlukky Story");
        nowShowing.add("Sachin Billions Dream");
        nowShowing.add("Red 2");

        List<String> comingSoon = new ArrayList<String>();
        comingSoon.add("Tubelight ");
        comingSoon.add("Bahubali 3 2018");
        comingSoon.add("Dhoom 4");
        comingSoon.add("Hindi Medium");

        listDataChild.put(listDataHeader.get(0), weeks);
        listDataChild.put(listDataHeader.get(1), top250); // Header, Child data
        listDataChild.put(listDataHeader.get(2), nowShowing);
        listDataChild.put(listDataHeader.get(3), comingSoon);
    }
}


ExpandableListAdapter


package com.keshav.myexpandablelistviewexampleworkinginactivity;

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;

public class ExpandableListAdapter extends BaseExpandableListAdapter {

    private Context _context;
    private List<String> _listDataHeader; // header titles
    // child data in format of header title, child title
    private HashMap<String, List<String>> _listDataChild;

    public ExpandableListAdapter(Context context, List<String> listDataHeader,
            HashMap<String, List<String>> listChildData) {
        this._context = context;
        this._listDataHeader = listDataHeader;
        this._listDataChild = listChildData;
    }

    @Override
    public Object getChild(int groupPosition, int childPosititon) {
        return this._listDataChild.get(this._listDataHeader.get(groupPosition))
                .get(childPosititon);
    }

    @Override
    public long getChildId(int groupPosition, int childPosition) {
        return childPosition;
    }

    @Override
    public View getChildView(int groupPosition, final int childPosition,
            boolean isLastChild, View convertView, ViewGroup parent) {

        final String childText = (String) getChild(groupPosition, childPosition);

        if (convertView == null) {
            LayoutInflater infalInflater = (LayoutInflater) this._context
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = infalInflater.inflate(R.layout.list_item, null);
        }

        TextView txtListChild = (TextView) convertView
                .findViewById(R.id.lblListItem);

        txtListChild.setText(childText);
        return convertView;
    }

    @Override
    public int getChildrenCount(int groupPosition) {
        return this._listDataChild.get(this._listDataHeader.get(groupPosition))
                .size();
    }

    @Override
    public Object getGroup(int groupPosition) {
        return this._listDataHeader.get(groupPosition);
    }

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

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

    @Override
    public View getGroupView(int groupPosition, boolean isExpanded,
            View convertView, ViewGroup parent) {
        String headerTitle = (String) getGroup(groupPosition);
        if (convertView == null) {
            LayoutInflater infalInflater = (LayoutInflater) this._context
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = infalInflater.inflate(R.layout.list_group, null);
        }

        TextView lblListHeader = (TextView) convertView
                .findViewById(R.id.lblListHeader);
        lblListHeader.setTypeface(null, Typeface.BOLD);
        lblListHeader.setText(headerTitle);

        return convertView;
    }

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

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

}


activity_mail.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical"
    android:background="#f4f4f4" >

            <ExpandableListView
                android:id="@+id/lvExp"
                android:layout_height="match_parent"
                android:layout_width="match_parent"
                android:cacheColorHint="#00000000"/>   

</LinearLayout>


list_grou.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:padding="8dp" 
    android:background="#000000">


    <TextView
        android:id="@+id/lblListHeader"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:paddingLeft="?android:attr/expandableListPreferredItemPaddingLeft"
        android:textSize="17dp"
        android:textColor="#f9f93d" />

</LinearLayout>


list_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="55dip"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/lblListItem"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:textSize="17dip"
        android:paddingTop="5dp"
        android:paddingBottom="5dp"
        android:textColor="#000000"
        android:paddingLeft="?android:attr/expandableListPreferredChildPaddingLeft" />

</LinearLayout>