ExpandableListView組件詳解

直接上圖：

 

 

 

代碼：

定義是適配器

 

package com.wsl.expandablelistview;

import android.content.Context;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.BaseExpandableListAdapter;
import android.widget.TextView;

public class MyExpandableListAdapter extends BaseExpandableListAdapter {

    private String[] groups={"我的好友","家人","同事","高中同學","初中同學"};
    private String[][] children={{"王明","李樂","劉衝","盧廣名"},{"王明","李樂","劉衝","盧廣名"},{"王明","李樂","劉衝","盧廣名"},{"王明","李樂","劉衝","盧廣名"}};

    private Context context=null;

    public MyExpandableListAdapter(Context context){
        this.context=context;
    }

    public Object getChild(int groupPosition, int childPosition) {
        // TODO Auto-generated method stub
        return this.children[groupPosition][childPosition];
    }

    public long getChildId(int groupPosition, int childPosition) {
        // TODO Auto-generated method stub

        return childPosition;
    }


    public TextView buildTextView(){

        AbsListView.LayoutParams param=new AbsListView.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, 35);
        TextView textview=new TextView(this.context);
        textview.setLayoutParams(param);
        textview.setTextSize(15.0f);
        textview.setGravity(Gravity.LEFT);
        textview.setPadding(40, 8, 3, 3);

        return textview;

    }




    public View getChildView(int groupPosition, int childPosition,
            boolean isLastChild, View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub
        TextView textView=buildTextView();
        textView.setText(getChild(groupPosition, childPosition).toString());
        return textView;
    }

    public int getChildrenCount(int groupPosition) {
        // TODO Auto-generated method stub
        return this.children[groupPosition].length;
    }

    public Object getGroup(int groupPosition) {
        // TODO Auto-generated method stub
        return this.groups[groupPosition];
    }

    public int getGroupCount() {
        // TODO Auto-generated method stub
        return groups.length;
    }

    public long getGroupId(int groupPosition) {
        // TODO Auto-generated method stub
        return groupPosition;
    }

    public View getGroupView(int groupPosition, boolean isExpanded,
            View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub
        TextView textview=buildTextView();
        textview.setText(this.getGroup(groupPosition).toString());
        return textview;

    }

    public boolean hasStableIds() {
        // TODO Auto-generated method stub
        return true;
    }

    public boolean isChildSelectable(int groupPosition, int childPosition) {
        // TODO Auto-generated method stub
        return true;
    }

}

 

 

定義佈局管理器

 

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <ExpandableListView
        android:id="@+id/elistview"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        />

</LinearLayout>

定義Activity

 

package com.wsl.expandablelistview;

import android.os.Bundle;
import android.app.Activity;
import android.view.ContextMenu;
import android.view.Menu;
import android.view.View;
import android.view.ContextMenu.ContextMenuInfo;
import android.widget.ExpandableListAdapter;
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;

public class MainActivity extends Activity {


    private ExpandableListView elistview=null;
    private ExpandableListAdapter adapter=null;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        this.elistview=(ExpandableListView) super.findViewById(R.id.elistview);
        this.adapter=new MyExpandableListAdapter(this);

        this.elistview.setAdapter(adapter);
        registerForContextMenu(this.elistview);

        this.elistview.setOnChildClickListener(new OnChildClickListenerImpl());
        this.elistview.setOnGroupClickListener(new OnGroupClickListenerImpl());
        this.elistview.setOnGroupCollapseListener(new OnGroupCollapseListenerImpl());
        this.elistview.setOnGroupExpandListener(new OnGroupExpandListenerImpl());
    }


    private class OnChildClickListenerImpl implements OnChildClickListener{

        public boolean onChildClick(ExpandableListView parent, View v,
                int groupPosition, int childPosition, long id) {

            Toast.makeText(MainActivity.this, "分組被選中，groupposition"+childPosition+",childPosition="+childPosition, Toast.LENGTH_LONG).show();
            return false;
        }

    }

    private class OnGroupClickListenerImpl implements OnGroupClickListener{

        public boolean onGroupClick(ExpandableListView parent, View v,
                int groupPosition, long id) {
            // TODO Auto-generated method stub
            Toast.makeText(MainActivity.this, "分組被選中，groupposition"+groupPosition, Toast.LENGTH_LONG).show();
            return false;
        }

    }


    public class OnGroupCollapseListenerImpl implements OnGroupCollapseListener{

        public void onGroupCollapse(int groupPosition) {
            // TODO Auto-generated method stub
            Toast.makeText(MainActivity.this, "關閉分組，groupposition"+groupPosition, Toast.LENGTH_LONG).show();
        }

    }


    public class OnGroupExpandListenerImpl implements OnGroupExpandListener{

        public void onGroupExpand(int groupPosition) {
            // TODO Auto-generated method stub
            Toast.makeText(MainActivity.this, "打開分組，groupposition"+groupPosition, Toast.LENGTH_LONG).show();
        }

    }


    @Override
    public void onCreateContextMenu(ContextMenu menu, View v,
            ContextMenuInfo menuInfo) {
        // TODO Auto-generated method stub
        super.onCreateContextMenu(menu, v, menuInfo);

        ExpandableListView.ExpandableListContextMenuInfo info=
                (ExpandableListView.ExpandableListContextMenuInfo) menuInfo;

        int type=ExpandableListView.getPackedPositionType(info.packedPosition);
        int group=ExpandableListView.getPackedPositionGroup(info.packedPosition);
        int child=ExpandableListView.getPackedPositionChild(info.packedPosition);

        Toast.makeText(MainActivity.this, "type="+type+";group"+group+";child="+child, Toast.LENGTH_LONG);
    }



    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }
}