Android Common Controls---button

<?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" android:paddingleft= "@dimen/activity_horizontal_margin"
>

<textview
Android:id= "@+id/text_view"
Android:layout_width= "Match_parent"
android:layout_height= "Wrap_content"
android:text= "First TextView"
Android:textsize= "24SP"
Android:textcolor= "#ff0000"
android:gravity= "Center"
/>

<button
Android:id= "@+id/btn1"
Android:layout_width= "Wrap_content"
android:layout_height= "Wrap_content"
android:layout_below= "@+id/text_view"
Android:layout_marginbottom= "10DP"
Android:layout_centerhorizontal= "true"
android:text= "OK"/>

</RelativeLayout>

/**
* Use anonymous classes to register listeners
*/

Package com.example.uiwidgettest;

Import android.app.Activity;
Import Android.os.Bundle;
Import Android.view.View;
Import Android.widget.Button;
Import Android.widget.TextView;

public class Textviewactivity extends Activity {

Private Button btn1;
Private TextView TV;

@Override
protected void OnCreate (Bundle savedinstancestate) {
Super.oncreate (savedinstancestate);
Setcontentview (R.layout.textview);

BTN1 = (Button) Findviewbyid (R.ID.BTN1);
TV = (TextView) Findviewbyid (R.id.text_view);

 　　　　  
Btn1.setonclicklistener (New View.onclicklistener () {

@Override
public void OnClick (View v) {
Switch (V.getid ()) {
Case R.id.tv:
Tv.settext ("TextView modified successfully");
Break
Default
Break
}
}
});
}
}

/**
* Implement an interface to register listeners
*/

 package com.example.uiwidgettest; 
 
 Import android.app.Activity; 
 Import Android.os.Bundle; 
 Import Android.view.View; 
 Import Android.widget.Button; 
 Import Android.widget.TextView; 
 
 public class Textviewactivity extends Activity implements View.onclicklistener {
 
 Private Button btn1; private TextView TV; 
 
 @Override 
 protected void onCreate (Bundle savedinstancestate) {
 Super.oncreate (savedinstances Tate); 
 Setcontentview (R.layout.textview);        
 
 Btn1 = (Button) Findviewbyid (R.ID.BTN1); 
 TV = (TextView) Findviewbyid (R.id.text_view);    
 
 Btn1.setonclicklistener (this); 
 
 
 
 
 @Override 
 public void OnClick (View v) {
 switch (V.getid ()) {
                R.ID.BTN1: 
 Tv.settext ("OK"); 
 Break        
 Default: 
 break; 
 } 
} 
} 

Android common Controls---button