Develop Reference

android studio: Android scrollable gridview with clickable buttons leading to different activities

am creating an android application whereby am required to create a gridview with clickable image buttons each leading to a different activities.Also the gridview should be scrollable since i have many buttons to add .Can anyone help on how to do this? thank you.
Here is a sample of what am trying to do:
sample clickable gridview:

activitymain.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:orientation="vertical"
tools:context=".MainActivity" >
<GridView
android:id="#+id/gridView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="#+id/textView1"
android:numColumns="3" >
</GridView>
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="25dp"
android:textStyle="bold"
android:text=" Computer Languages..." />
</RelativeLayout>
programlist.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="match_parent"
android:orientation="vertical" >
<ImageView
android:id="#+id/imageView1"
android:layout_gravity="center"
android:layout_width="88dp"
android:layout_height="88dp"
android:layout_marginTop="5dp"
android:layout_marginBottom="5dp"
android:src="#drawable/ic_launcher" />
<TextView
android:id="#+id/textView1"
android:layout_gravity="center"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="15dp"
android:layout_marginTop="5dp"
android:layout_marginBottom="5dp"
android:text="TextView" />
</LinearLayout>
In MainActivity.java
package com.gnetspace.simplegridview;
import java.util.ArrayList;
import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.view.Menu;
import android.widget.AdapterView;
import android.widget.GridView;
public class MainActivity extends Activity {
GridView gv;
Context context;
ArrayList prgmName;
public static String [] prgmNameList={"Let Us C","c++","JAVA","Jsp","Microsoft .Net","Android","PHP","Jquery","JavaScript"};
public static int [] prgmImages={R.drawable.images,R.drawable.images1,R.drawable.images2,R.drawable.images3,R.drawable.images4,R.drawable.images5,R.drawable.images6,R.drawable.images7,R.drawable.images8};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
gv=(GridView) findViewById(R.id.gridView1);
gv.setAdapter(new CustomAdapter(this, prgmNameList,prgmImages));
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
Create a folder by name drawable in res directory.
public static int [] prgmImages={R.drawable.images,R.drawable.images1,R.drawable.images2,R.drawable.images3,R.drawable.images4,R.drawable.images5,R.drawable.images6,R.drawable.images7,R.drawable.images8};
Create CustomAdapter and paste the following code.
package com.gnetspace.simplegridview;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
public class CustomAdapter extends BaseAdapter{
String [] result;
Context context;
int [] imageId;
private static LayoutInflater inflater=null;
public CustomAdapter(MainActivity mainActivity, String[] prgmNameList, int[] prgmImages) {
// TODO Auto-generated constructor stub
result=prgmNameList;
context=mainActivity;
imageId=prgmImages;
inflater = ( LayoutInflater )context.
getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
#Override
public int getCount() {
// TODO Auto-generated method stub
return result.length;
}
#Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return position;
}
#Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
public class Holder
{
TextView tv;
ImageView img;
}
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
Holder holder=new Holder();
View rowView;
rowView = inflater.inflate(R.layout.program_list, null);
holder.tv=(TextView) rowView.findViewById(R.id.textView1);
holder.img=(ImageView) rowView.findViewById(R.id.imageView1);
holder.tv.setText(result[position]);
holder.img.setImageResource(imageId[position]);
rowView.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
Toast.makeText(context, "You Clicked "+result[position], Toast.LENGTH_LONG).show();
}
});
return rowView;
}
}
the source link is caveofprograming

How to display the spinner with transparent background for selected value in android?

package com.android.example;
import android.app.Activity;
import android.content.Context;
import android.graphics.Color;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;
import android.widget.RelativeLayout;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemSelectedListener;
public class SpinnerActivity extends Activity implements OnItemSelectedListener {
private ICSAdapter mAdapter;
private String[] mNameList = {"one","two","three" };
Context context=this;
Spinner room_type;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.spinner_activity_main);
room_type = (Spinner) findViewById(R.id.ics_spinner);
mAdapter = new ICSAdapter(context, mNameList);
room_type.setAdapter(mAdapter);
room_type.setOnItemSelectedListener(new OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> Adapter, View view,
int position, long id) {
room_type.setSelection(position);
View selectedText = (View) Adapter.getChildAt(position);
if (selectedText != null) {
RelativeLayout real = (RelativeLayout) selectedText.findViewById(R.id.real);
TextView selected = (TextView) selectedText.findViewById(R.id.name_view);
selected.setText(mNameList[position].toUpperCase());
((View) selected.getParent()).setBackgroundColor(Color.TRANSPARENT);
// real.setBackgroundColor(Color.TRANSPARENT);
}
}
#Override
public void onNothingSelected(AdapterView<?> Adapter) {
// TODO Auto-generated method stub
}
});
}
public class ICSAdapter extends BaseAdapter {
private LayoutInflater inflater;
private Context context;
String[] room_type;
public ICSAdapter(Context context, String[] _accidentList) {
this.room_type = _accidentList;
this.context = context;
inflater = (LayoutInflater) this.context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
#Override
public int getCount() {
return room_type.length;
}
#Override
public Object getItem(int position) {
return room_type[position];
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
ViewHolder holder;
convertView = inflater.inflate(R.layout.drop_down_view, null);
holder = new ViewHolder();
holder.spinnerText = (TextView) convertView.findViewById(R.id.name_view);
holder.spinnerText.setText(room_type[position]);
return convertView;
}
public class ViewHolder {
TextView spinnerText;
}
}
#Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
// TODO Auto-generated method stub
}
#Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
}
activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#drawable/bg"
android:layout_gravity="center"
>
<Spinner
android:id="#+id/ics_spinner"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:layout_alignParentTop="true"
android:background="#drawable/text3"
/>
</RelativeLayout>
dropdown.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/real"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="#2D333C" >
<TextView
android:id="#+id/name_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:layout_marginTop="5dp"
android:gravity="center"
android:text="324"
android:textColor="#color/android:white"
android:textSize="18sp" />
</RelativeLayout>
Here i am using the default spinner with some background image. I have one issue, when i click the spinner,the dropdown list will display in white color background.But the orignal color background will not displayed(android:background="#2D333C")
I am using the transparent color for backgound change.How to resolve this issue. I want to display the given background color,when i click the spinner in dropdown list.After i select the selected value,the background will transaparent.Can anyone help me to solve this issue?

Make one custom file in drawable folder.
mybackground.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="false" android:drawable="#color/yourcolorName" />
<item android:drawable="#android:color/transparent" />
</selector>
Now set this file to your Spinner.
<Spinner
android:id="#+id/ics_spinner"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:layout_alignParentTop="true"
android:background="#drawable/mybackground"
/>

need help for on click listener for android custom ListView

my app has custom ListView, each row contains checkbox ,edit text and 2 buttons. In the main xml layout file i have 1 submit button and listView. i want that, when i click on submit button, i should get all checked row position.I am new to android programming ,so plz help me my code is not working here is my code:
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="match_parent"
android:layout_height="match_parent">
<Button android:layout_height="wrap_content"
android:text="#string/button_submit"
android:layout_width="wrap_content"
android:id="#+id/main_submit_button" android:onClick="#string/button_submit"></Button>
<ListView
android:id="#+id/list_view"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
/>
</LinearLayout>
items.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<LinearLayout android:layout_height="wrap_content"
android:layout_width="fill_parent">
<TextView
android:layout_height="wrap_content"
android:layout_width="fill_parent" android:layout_weight="1"
android:id="#+id/items_name"
android:gravity="left"
android:textStyle="bold" />
<CheckBox android:id="#+id/items_check"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="right"
/>
</LinearLayout>
<LinearLayout android:layout_height="wrap_content"
android:layout_width="fill_parent">
<Button android:id="#+id/items_add_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="left"
android:text="#string/text_switcher_plus" />
<EditText android:digits="10"
android:textStyle="bold" android:gravity="left"
android:id="#+id/items_plates" android:layout_height="wrap_content"
android:layout_width="90dp"></EditText>
<Button android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:id="#+id/items_minus_button"
android:text="#string/text_switcher_minus"
android:gravity="right"
/>
</LinearLayout>
</LinearLayout>
VegmenuActivity
package com.sagar.resmenu;
import java.util.ArrayList;
import java.util.Arrays;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.util.SparseBooleanArray;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.Button;
import android.widget.ListView;
// reference:http://pareshnmayani.wordpress.com/tag/android-custom-listview-example
public class VegmenuActivity extends Activity implements OnItemClickListener{
//dynamic array that contains names of items
private ArrayList<String> items = new ArrayList<String>
(Arrays.asList("Veg pulav", "Pav bhaji", "Panir tikka", "veg kolhapuri",
"Coconut Rice", "Curd rice", "Mint Pulao",
"Banana Custard","Basundi", "Cheese potato Tikkis",
"Dum aloo"));
private ArrayList<Integer> counter = new ArrayList<Integer>
(Arrays.asList(0, 0,0, 0, 0,0, 0,0, 0,0,0));
private SparseBooleanArray a;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final ListView lv =(ListView)findViewById(R.id.list_view);
// lv.setOnClickListener(null);
MyAdapter adapter = new MyAdapter(getApplicationContext(),items,counter);
lv.setAdapter(adapter);
lv.setItemsCanFocus(false);
lv.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
Button submit1;
submit1 = (Button)findViewById(R.id.main_submit_button);
submit1.setOnClickListener(new OnClickListener()
{
#Override
public void onClick(View v)
{
a = new SparseBooleanArray();
a.clear();
a = lv.getCheckedItemPositions();
int len = items.size();
for (int i = 0; i < len; i++)
{
if(a.valueAt(i) == true)
Log.d("Returned ", String.valueOf(a.valueAt(i)));
}
}
});
}
//private OnItemClickListener selectCat = new OnItemClickListener();
public void onItemClick(AdapterView<?> a, View v, int positon, long id) {
// TODO Auto-generated method stub
}
}
MyAdapter.java
package com.sagar.resmenu;
import java.util.ArrayList;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.TextSwitcher;
import android.widget.TextView;
public class MyAdapter extends BaseAdapter implements OnClickListener{
private LayoutInflater inflater;
private ArrayList<String> data;
VegmenuActivity m;
private ArrayList<Integer> counter;
public MyAdapter(Context context, ArrayList<String> data,ArrayList<Integer> counter) {
// TODO Auto-generated constructor stub
super();
// Caches the LayoutInflater for quicker use
this.inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
// Sets the events data
this.data= data;
this.counter=counter;
}
public int getCount() {
return this.data.size();
//return this.counter.size();
}
public String getItem(int position) throws IndexOutOfBoundsException{
return null;
}
public long getItemId(int position) throws IndexOutOfBoundsException{
return 0;
}
public int getViewTypeCount(){
return 1;
}
public static class ViewHolder
{
TextView items_name;
CheckBox items_check ;
Button items_plus_button;
Button items_minus_button;
EditText plates;
}
public View getView(int position, View convertView, ViewGroup parent){
//String myText = getItem(position);
ViewHolder holder;
if(convertView == null){ // If the View is not cached
// Inflates the Common View from XML file
holder = new ViewHolder();
convertView = this.inflater.inflate(R.layout.items,parent,false);
holder.items_name = (TextView) convertView.findViewById(R.id.items_name);
holder.plates = (EditText) convertView.findViewById(R.id.items_plates);
holder.items_check = (CheckBox) convertView.findViewById(R.id.items_check);
convertView.setTag(holder);
}
else
holder=(ViewHolder)convertView.getTag();
holder.items_name.setText(data.get(position));
holder.plates.setText(String.valueOf(counter.get(position)));
return convertView;
}
#Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
}
}

when I need check boxes inside listview, I often code as following:
MyAdapter.java:
- Declare an boolean array to mark which item is checked/unchecked:
....
boolean[] checked;
...
inside constructor:
checked = new boolean[data.size()];
- Inside getView()
{
.....
holder.items_check.setChecked(checked[position]);
holder.items_check.setOnCheckedChangeListener(new OnCheckedChangeListener() {
#Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
checked[position] = isChecked;
}
});
.....
- And method to get all checked items:
boolean[] getCheckedItems() {
return checked;
}
That's !

Could it be that your getItem and getItemId only return null and 1? These methods need to return the correct data for this to work I believe. getItem would need to be:
String getItem(int position)
{
return data.get(position);
}
and getItemId would simply return position instead of 0:
String getItemId(int position)
{
return position;
}

How to let a user add and remove items to a ListView?

I am trying to make it so that when a user clicks a button, it pops up a dialog with an EditText and an OK Button. When the user completes, the dialog, it should add the item they just typed in to the ListView. How do I do this?
I will need a large code example; this is my first application.

You'll want to follow the official notepad tutorial example. It's very comprehensive. It does 95% of what you want to do.
http://developer.android.com/resources/tutorials/notepad/index.html

Well here is a sample code. There is a button to add text in list and long press on list item will remove it.
activity_main.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"
android:orientation="vertical" >
<Button
android:id="#+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:text="Add Item" />
<ListView
android:id="#+id/list_view"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
dialog_layout.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="match_parent"
android:orientation="vertical" >
<EditText
android:id="#+id/edit_box"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:inputType="text" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:orientation="horizontal"
android:weightSum="2" >
<Button
android:id="#+id/button_ok"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="OK" />
<Button
android:id="#+id/button_cancel"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="CANCEL" />
</LinearLayout>
MainActivity.java
package com.example.listexample;
import java.util.ArrayList;
import android.app.Activity;
import android.app.Dialog;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemLongClickListener;
import android.widget.BaseAdapter;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
public class MainActivity extends Activity implements OnClickListener,
OnItemLongClickListener {
private ArrayList<String> datasource;
private MyAdapter adapter;
private Dialog dialog;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
datasource = new ArrayList<String>();
adapter = new MyAdapter();
ListView listView = (ListView) findViewById(R.id.list_view);
listView.setAdapter(adapter);
listView.setOnItemLongClickListener(this);
findViewById(R.id.button).setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
dialog = new Dialog(MainActivity.this);
dialog.setContentView(R.layout.dialog_layout);
dialog.findViewById(R.id.button_cancel).setOnClickListener(
MainActivity.this);
dialog.findViewById(R.id.button_ok).setOnClickListener(
MainActivity.this);
dialog.show();
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
private class MyAdapter extends BaseAdapter {
#Override
public int getCount() {
// TODO Auto-generated method stub
return datasource.size();
}
#Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return datasource.get(position);
}
#Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
TextView view = (TextView) convertView;
if (null == view) {
view = new TextView(MainActivity.this);
view.setPadding(10, 10, 10, 10);
}
view.setText(datasource.get(position));
return view;
}
}
#Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.button_cancel:
dialog.dismiss();
break;
case R.id.button_ok:
String text = ((EditText) dialog.findViewById(R.id.edit_box))
.getText().toString();
if (null != text && 0 != text.compareTo("")) {
datasource.add(text);
dialog.dismiss();
adapter.notifyDataSetChanged();
}
break;
}
}
#Override
public boolean onItemLongClick(AdapterView<?> listView, View view,
int position, long column) {
datasource.remove(position);
adapter.notifyDataSetChanged();
return true;
}
}

ListActivity throws NullPointerException

Hey guys i have a ListActivity... a very simple at that... and it keeps throwing NullPointer Exception though i have done it exactly as the Sample List7 except that i have used the Layout inflater... below is the code... Can u plz comment the error i have done here??
import java.util.Vector;
import android.app.Activity;
import android.app.ListActivity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.AdapterView.OnItemSelectedListener;
public class CustomList extends ListActivity implements OnItemSelectedListener{
Vector<String> VTitle;
Vector<String> VDescription;
TextView display;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
VTitle.addElement("First Title");
VTitle.addElement("Second Title");
VTitle.addElement("Third Title");
VTitle.addElement("Fourth Title");
VDescription.addElement("1 Description");
VDescription.addElement("2 Description");
VDescription.addElement("3 Description");
VDescription.addElement("4 Description");
display = (TextView)findViewById(R.id.display);
setListAdapter(new CustomAdapter(this));
}
#Override
protected void onListItemClick(ListView l, View v, int position, long id) {
// TODO Auto-generated method stub
display.setText(VTitle.elementAt(position));
}
class CustomAdapter extends BaseAdapter {
protected Activity mContext;
public CustomAdapter(Activity context) {
mContext = context;
// TODO Auto-generated constructor stub
}
#Override
public int getCount() {
// TODO Auto-generated method stub
return VTitle.size();
}
#Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return position;
}
#Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
View row = convertView;
if(row==null) {
LayoutInflater inflater = mContext.getLayoutInflater();
row = inflater.inflate(R.layout.row,null);
}
TextView title = (TextView)row.findViewById(R.id.title);
title.setText(VTitle.elementAt(position));
TextView description = (TextView)row.findViewById(R.id.description);
description.setText(VDescription.elementAt(position));
ImageView image = (ImageView)row.findViewById(R.id.image);
switch(position){
case 0:
image.setImageResource(R.drawable.check);
break;
case 1:
image.setImageResource(R.drawable.dos);
break;
case 2:
image.setImageResource(R.drawable.smily);
break;
case 3:
image.setImageResource(R.drawable.wrong);
break;
}
return(row);
}
}
#Override
public void onItemSelected(AdapterView parent, View v, int position, long id) {
// TODO Auto-generated method stub
display.setText(VTitle.elementAt(position));
}
#Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
}
And the xmls are like this....
"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" >
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id = "#+id/display"
android:text="something"
/>
<ListView
android:id="#android:id/list"
android:layout_width="fill_parent"
android:drawSelectorOnTop="false"
android:layout_height="0px">
</ListView>
</LinearLayout>
"row.xml"
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<ImageView
android:id="#+id/image"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
</ImageView>
<TextView
android:text="Title"
android:id="#+id/title"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
</TextView>
<TextView
android:text="description"
android:id="#+id/description"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
</TextView>
</LinearLayout>

VTitle and VDescription aren't initialized
Before accessing one of these attributes, you should :
VTitle = new Vector<String>();
VDescription = new Vector<String>();
Moreover in java, the first letter of an attribute name should be lowercase, and in android this first letter should be an m, to denote a member field.