android - keyboard not shown when alert box is popup containing a webview -

i trying make alertbox popup , display webview user can login check email. alert box working , displaying webpage. problem when want enter mu email address, no keyboard shown input.

please or suggest me alternative ways.

code alertbox:

gmail.setonclicklistener(new onclicklistener()    	     {    	         @override    	         public void onclick(view v)    	         {    	        	   	        	   	        	 alertdialog.builder alert = new alertdialog.builder(registeractivity.this);   	        	 alert.settitle("check gmail");    	        	 webview wv = new webview(registeractivity.this);  	        	   	        	 wv.setontouchlistener(new view.ontouchlistener() {    	     			@override  	     			public boolean ontouch(view v, motionevent event) {  	                     switch (event.getaction()) {  	                     case motionevent.action_down:  	                     case motionevent.action_up:  	                         if (!v.hasfocus()) {  	                             v.requestfocus();  	                         }  	                         break;  	                 }  	                 return false;  	     			}  	             });  	        	   	        	 wv.loadurl("https://mail.google.com");  	        	 wv.setwebviewclient(new webviewclient() {  	        	     @override  	        	     public boolean shouldoverrideurlloading(webview view, string url) {  	        	         view.loadurl(url);    	        	         return true;  	        	     }  	        	 });    	        	 alert.setview(wv);  	        	 alert.setnegativebutton("close", new dialoginterface.onclicklistener() {  	        	     @override  	        	     public void onclick(dialoginterface dialog, int id) {  	        	         dialog.dismiss();  	        	     }  	        	 });  	        	 alert.show();  	         }    	     }); 

as requested xml code:

<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"      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.example.mohalogin.registeractivity"      android:background="@drawable/register" >            <textview          android:layout_width="wrap_content"          android:layout_height="wrap_content"          android:text="enter name" />        <edittext          android:layout_width="fill_parent"          android:layout_height="wrap_content"          android:id="@+id/edittextname" />        <textview          android:layout_width="wrap_content"          android:layout_height="wrap_content"          android:text="choose username" />        <edittext          android:layout_width="fill_parent"          android:layout_height="wrap_content"          android:id="@+id/edittextusername" />        <textview          android:layout_width="wrap_content"          android:layout_height="wrap_content"          android:text="choose password" />        <edittext          android:layout_width="fill_parent"          android:layout_height="wrap_content"          android:inputtype="textpassword"          android:id="@+id/edittextpassword" />        <textview          android:layout_width="wrap_content"          android:layout_height="wrap_content"          android:text="enter email" />        <edittext          android:layout_width="fill_parent"          android:layout_height="wrap_content"          android:inputtype="textemailaddress"          android:id="@+id/edittextemail" />        <button          android:layout_width="fill_parent"          android:layout_height="wrap_content"          android:text="register"          android:id="@+id/buttonregister" />      <textview          android:layout_width="wrap_content"          android:layout_height="wrap_content"          android:textstyle="bold"          android:text="already registered" />        <button          android:layout_width="fill_parent"          android:layout_height="wrap_content"          android:text="login"          android:id="@+id/buttonlogin" />            <linearlayout android:layout_width="match_parent"          android:layout_height="wrap_content"          android:orientation="horizontal"          android:padding="25dp">                    <button          android:id="@+id/googlemail"          android:layout_width="50dp"          android:layout_height="50dp"          android:background="@drawable/gmail"/>                    <button           android:id="@+id/yahoomail"          android:layout_width="50dp"          android:layout_height="50dp"          android:background="@drawable/yahoo"/>                          </linearlayout>    </linearlayout>

check out question , it's relative answers.

hope !!!