Android: November 2014

ExpandableListviewActivity
-----------------------------------

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

import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ExpandableListView;
import android.widget.ExpandableListView.OnChildClickListener;
import android.widget.ExpandableListView.OnGroupCollapseListener;
import android.widget.ExpandableListView.OnGroupExpandListener;
import android.widget.Toast;

public class ExpandableListviewActivity extends ActionBarActivity implements
OnChildClickListener {

private ExpandableListView expandablelistview;
private ExpandableListAdapter adapter;

List<String> listDataHeader;
HashMap<String, List<String>> listDataChild;

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

DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);

expandablelistview = (ExpandableListView) findViewById(R.id.expandablelistview);

prepareListData();
adapter = new ExpandableListAdapter(ExpandableListviewActivity.this,
listDataHeader, listDataChild);

expandablelistview.setAdapter(adapter);
expandablelistview
.setOnGroupExpandListener(new OnGroupExpandListener() {

@Override
public void onGroupExpand(int groupPosition) {

int len = listDataHeader.size();

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

expandablelistview
.setOnGroupCollapseListener(new OnGroupCollapseListener() {

@Override
public void onGroupCollapse(int groupPosition) {

}
});
expandablelistview.setOnChildClickListener(this);

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.expandable_listview, menu);
return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}

private void prepareListData() {
listDataHeader = new ArrayList<String>();
listDataChild = new HashMap<String, List<String>>();

// Adding child data
listDataHeader.add("Bus");
listDataHeader.add("Train");
listDataHeader.add("Flignt");

// Adding child data
List<String> busitems = new ArrayList<String>();
busitems.add("Madurai Radha");
busitems.add("KPN");
busitems.add("Raja");
busitems.add("Parveen");

List<String> trainitems = new ArrayList<String>();
trainitems.add("Pandian");
trainitems.add("Coimbatore");
trainitems.add("Pothigai");

List<String> airitems = new ArrayList<String>();
airitems.add("Air India");
airitems.add("Air Asia");
airitems.add("Air Bus");

listDataChild.put(listDataHeader.get(0), busitems); // Header, Child data
listDataChild.put(listDataHeader.get(1), trainitems);
listDataChild.put(listDataHeader.get(2), airitems);
}

@Override
public boolean onChildClick(ExpandableListView parent, View v,
int groupPosition, int childPosition, long id) {
// TODO Auto-generated method stub

Toast.makeText(
getApplicationContext(),
"child item clicked Group :" + groupPosition
+ " Child position :" + childPosition, 0).show();
return true;
}
}

ExpandableListAdapter
----------------------------

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;
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 int getGroupCount() {

return this.listDataHeader.size();
}

@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 Object getChild(int groupPosition, int childPosition) {

return this.listDataChild.get(this.listDataHeader.get(groupPosition))
.get(childPosition);
}

@Override
public long getGroupId(int groupPosition) {

return groupPosition;
}

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

return childPosition;
}

@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_item, null);
}

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

return convertView;
}

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

if (childPosition == 0) {

System.out.println("child postion 0");
}

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_child_item, null);
}

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

txtListChild.setText(childText);
return convertView;
}

@Override
public boolean hasStableIds() {

return false;
}

@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {

return true;
}

}

activity_expandablelistview.xml
----------------------------------------

<RelativeLayout 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"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.eswaran.fragements.ExpandableListviewActivity" >

<ExpandableListView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/expandablelistview"
android:groupIndicator="@drawable/group_indicator"
/>

</RelativeLayout>

list_group_item.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"

<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="@color/fc_background_dark_green" />

</LinearLayout>

list_child_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:paddingLeft="?android:attr/expandableListPreferredChildPaddingLeft" />

</LinearLayout>

group_indicator.xml

-------------------------

<?xml version="1.0" encoding="utf-8"?>

</selector>

Android

Thursday, 13 November 2014

Expandable Listview