ExpandableListView组件详解

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","高中同学","初中同学"};
private String[][] children={{"王明","李乐","刘冲","卢广名"},{"王明","李乐","刘冲","卢广名"},{"王明","李乐","刘冲","卢广名"},{"王明","李乐","刘冲","卢广名"}};

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;
}

}

<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>

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, "分组被选中，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, "分组被选中，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, "关闭分组，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, "打开分组，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;
}
}