public class STZAppActivity extends Activity
{
 ListView listView;
 @Override
    protected void onCreate(Bundle savedInstanceState){
     super.onCreate(savedInstanceState);
     setContentView(R.layout.applist);
     listView = (ListView)findViewById(R.id.listView1);
     PackageManager packagemanager = this.getPackageManager();
  List< ApplicationInfo > appList = packagemanager.getInstalledApplications( 0 );  
  Log.d("", ""+ appList.size());
  ArrayList<String> list = new ArrayList<String>();
  for (int i = 0; i < appList.size(); i++) {
    list.add( appList.get(i).loadLabel(packagemanager).toString());
    ArrayAdapter<String> adapter;
       adapter = new ArrayAdapter<String>(this,  android.R.layout.simple_list_item_1, list);
       
       
       listView.setAdapter(adapter);
  }
  listView.setOnItemClickListener(mainSelect);
   
    }   
 private OnItemClickListener mainSelect = new AdapterView.OnItemClickListener() {
    public void onItemClick(AdapterView av,  View v, int position, long id) {
     
     Log.e("",""+listView.getTag(position));
     Toast.makeText(getApplicationContext(), listView.getTag(position).toString(), Toast.LENGTH_SHORT).show();
    }
   };
}

 04-02 18:23:35.750: E/AndroidRuntime(7023): FATAL EXCEPTION: main
04-02 18:23:35.750: E/AndroidRuntime(7023): java.lang.NullPointerException
04-02 18:23:35.750: E/AndroidRuntime(7023):  at com.qnsolv.android.nfc.st.STZAppActivity$1.onItemClick(STZAppActivity.java:45)
04-02 18:23:35.750: E/AndroidRuntime(7023):  at android.widget.AdapterView.performItemClick(AdapterView.java:292)
04-02 18:23:35.750: E/AndroidRuntime(7023):  at android.widget.AbsListView.performItemClick(AbsListView.java:1058)
04-02 18:23:35.750: E/AndroidRuntime(7023):  at android.widget.AbsListView$PerformClick.run(AbsListView.java:2514)
04-02 18:23:35.750: E/AndroidRuntime(7023):  at android.widget.AbsListView$1.run(AbsListView.java:3168)
04-02 18:23:35.750: E/AndroidRuntime(7023):  at android.os.Handler.handleCallback(Handler.java:605)
04-02 18:23:35.750: E/AndroidRuntime(7023):  at android.os.Handler.dispatchMessage(Handler.java:92)
04-02 18:23:35.750: E/AndroidRuntime(7023):  at android.os.Looper.loop(Looper.java:137)
04-02 18:23:35.750: E/AndroidRuntime(7023):  at android.app.ActivityThread.main(ActivityThread.java:4340)
04-02 18:23:35.750: E/AndroidRuntime(7023):  at java.lang.reflect.Method.invokeNative(Native Method)
04-02 18:23:35.750: E/AndroidRuntime(7023):  at java.lang.reflect.Method.invoke(Method.java:511)
04-02 18:23:35.750: E/AndroidRuntime(7023):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
04-02 18:23:35.750: E/AndroidRuntime(7023):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
04-02 18:23:35.750: E/AndroidRuntime(7023):  at dalvik.system.NativeStart.main(Native Method)
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