Android Development Tree Control Expandablelistview (i)

This example is very simple, simple to a beginner can be casually developed, today's purpose is only to achieve the effect, if you want to go deep here are a few very good blog:

several special properties of Android Expandablelistview

http://blog.csdn.net/t12x3456/article/details/7828620

Expandablelistview explanation
Http://www.apkbus.com/thread-124715-1-1.html

As with the ListView, we need to inherit an adapter called Baseexpandlistadapter, and then rewrite the methods of several parent classes.

Package com.example.uitest;

Import Android.content.Context;
Import Android.view.LayoutInflater;
Import Android.view.View;
Import Android.view.ViewGroup;
Import Android.widget.BaseExpandableListAdapter;

public class Treeadapter extends baseexpandablelistadapter{

Context context;


Public Treeadapter (Context context) {
Super ();
This.context = context;
}

@Override
Public Object getchild (int arg0, int arg1) {
return 0;
}

@Override
public long Getchildid (int arg0, int arg1) {
TODO auto-generated Method Stub
return 0;
}

@Override
Public View getchildview (int arg0, int arg1, Boolean arg2, view V,
ViewGroup Arg4) {
v = layoutinflater.from (context). Inflate (r.layout.item2, NULL);
return v;
}

@Override
public int Getchildrencount (int arg0) {
TODO auto-generated Method Stub
return 3;
}

@Override
Public Object getgroup (int arg0) {
TODO auto-generated Method Stub
return null;
}

@Override
public int GetGroupCount () {
return 3;
}

@Override
public long getgroupid (int arg0) {
return 0;
}

@Override
Public View getgroupview (int arg0, Boolean arg1, View V, ViewGroup VGs) {
v = layoutinflater.from (context). Inflate (r.layout.item_autocomplete, NULL);
return v;
}

@Override
public Boolean hasstableids () {
TODO auto-generated Method Stub
return false;
}

@Override
public boolean ischildselectable (int arg0, int arg1) {
TODO auto-generated Method Stub
return false;
}

}

Here we only operate four functions, namely:

public int Getchildrencount (int arg0);//Gets the sub-layout total record of the level two list, which is the number of rows

public int getgroupcount ();//Gets the number of rows for the first-level list

Public View getchildview (int arg0, int arg1, Boolean arg2, view V,
ViewGroup arg4);//Get the resource layout of level two list

Public View getgroupview (int arg0, Boolean arg1, View V, ViewGroup VGS);//Gets the number of rows for the first-level list

Finally, load the adapter into the Expandablelistview:

Expandablelistview view = (Expandablelistview) Findviewbyid (R.ID.ELV);
Treeadapter adapter = new Treeadapter (Getapplicationcontext ());
View.setadapter (adapter);

Main layout xml:

<linearlayout xmlns:android= "Http://schemas.android.com/apk/res/android"
Xmlns:tools= "Http://schemas.android.com/tools"
Android:layout_width= "Match_parent"
android:layout_height= "Match_parent" >

<expandablelistview
Android:id= "@+id/elv"
Android:layout_width= "Fill_parent"

Android:groupindicator= "@null"
android:layout_height= "Wrap_content" ></ExpandableListView>

</LinearLayout>

This is the most condensed version of everyone should be able to understand quickly;

Android Development Tree Control Expandablelistview (i)