android - how to solve the following code incorrect execution of adding customlist to gridView clickable? -

i unable rectify following code problem past 2 days. don't know how add custom list items existing grid view. have completed , compiled code without errors. unfortunately clickable not going on after clicking grid view letters. requirement ex:if press grid view letter["a"] should go go layout , should display list of items[any list/icon menu/list icons]. please me out of problem soon. code have using:

gridviewactivity.java

public class gridviewactivity extends activity {      gridview gridview;     static final string[] numbers = new string[]{             "a", "b", "c", "d", "e",             "f", "g", "h", "i", "j",             "k", "l", "m", "n", "o",             "p", "q", "r", "s", "t",             "u", "v", "w", "x", "y", "z"};      @override     public void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);          setcontentview(r.layout.content_main);          gridview = (gridview) findviewbyid(r.id.gridview1);          arrayadapter<string> adapter = new arrayadapter<string>(this,                 android.r.layout.simple_list_item_1, numbers);          gridview.setadapter(adapter);          gridview.setonitemclicklistener(new adapterview.onitemclicklistener() {             public void onitemclick(adapterview<?> parent, view v,                                     int position, long id) {                toast.maketext(getapplicationcontext(),                        ""+position, toast.length_short).show();                 intent intent = null;                 if(position == 0){                     intent = new intent(v.getcontext(), listactivity.class);                    // intent.putextra("title", list.add(list));                 }                 if(position == 1){                     intent = new intent(v.getcontext(), listactivity.class);                 }                 if(position == 2){                     intent = new intent(v.getcontext(), listactivity.class);                 }                 if(position == 3){                     intent = new intent(v.getcontext(), listactivity.class);                 }                 if(position ==4){                     intent = new intent(v.getcontext(), listactivity.class);                 }                 if(position == 5){                     intent = new intent(v.getcontext(), listactivity.class);                 }                 if(position == 6){                     intent = new intent(v.get context(), list activity.class);}                 if(position == 7){                     intent = new intent(v.getcontext(), listactivity.class);                 }                 if(position == 8){                     intent = new intent(v.getcontext(), listactivity.class);                 }                 if(position == 9){                     intent = new intent(v.getcontext(), listactivity.class);                 }                 if(position == 10){                     intent = new intent(v.getcontext(), listactivity.class);                 }                 if(position == 11){                     intent = new intent(v.getcontext(), listactivity.class);                 }                 if(position == 12) {                     intent = new intent(v.getcontext(), listactivity.class);                 }                 if(position == 13){                 intent = new intent(v.getcontext(), listactivity.class);                 }                 if(position == 14){                     intent = new intent(v.get context(), list activity.class);                 }                 if(position == 15){                     intent = new intent(v.getcontext(), listactivity.class);                 }                 if(position == 16){                     intent = new intent(v.getcontext(), listactivity.class);                 }                 if(position == 17){                     intent = new intent(v.getcontext(), listactivity.class);                 }                 if(position == 18){                     intent = new intent(v.getcontext(), listactivity.class);                 }                 if(position == 19){                     intent = new intent(v.getcontext(), listactivity.class);                 }                 if(position == 20){                     intent = new intent(v.getcontext(), listactivity.class);                 }                 if(position == 21){                     intent = new intent(v.getcontext(), listactivity.class);                 }                 if(position == 22){                     intent = new intent(v.getcontext(), listactivity.class);                 }                 if(position == 23){                     intent = new intent(v.getcontext(), listactivity.class);                 }                 if(position == 23){                     intent = new intent(v.getcontext(), listactivity.class);                 }                 if(position == 24){                     intent = new intent(v.getcontext(), listactivity.class);                 }                 if(position == 25){                     intent = new intent(v.getcontext(), listactivity.class);                 }                 if(position == 26){                     intent = new intent(v.getcontext(), listactivity.class);                 }                 startactivity(intent);             }         });      } } 

main.xml:

<?xml version="1.0" encoding="utf-8"?> <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" >      <listview         android:id="@+id/listview1"         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:layout_alignparenttop="true"         android:entries="@array/list"         android:layout_centerhorizontal="true" >     </listview>  </relativelayout> 

listactivity.java:

package com.example.brahmaiah.grid_view;  import android.app.activity; import android.os.bundle; import android.view.menu;  /**  * created brahmaiah on 1/29/2016.  */ public class listactivity extends activity {      @override     public void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.main);     }      @override     public boolean oncreateoptionsmenu(menu menu) {         getmenuinflater().inflate(r.menu.menu_grid_view, menu);         return true;     } } 

content_main.xml

<?xml version="1.0" encoding="utf-8"?> <gridview xmlns:android="http://schemas.android.com/apk/res/android"     android:id="@+id/gridview1"     android:numcolumns="auto_fit"     android:gravity="center"     android:columnwidth="50dp"     android:stretchmode="columnwidth"     android:layout_width="fill_parent"     android:layout_height="fill_parent" > </gridview> 

i think these content enough understand problem of app code.. o/p coming ...grid view has been displaying after clicking on grid view items {a,b...}is displaying message this.i.e unfortunately list activity closed

first cleanup code little bit eliminating unnecessary "if" blocks. change following line in code:

intent = new intent(v.getcontext(), listactivity.class); 

to

intent = new intent(getapplicationcontext(), listactivity.class); 

edit: additionally check listactivity in manifest:

<activity android:name=".listactivity"></activity>