Android adds an event to the button in the XML layout configuration file

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To add a listener to Android, follow these steps:

1. Define the button in layout and specify the listener of the response.

<? XML version = "1.0" encoding = "UTF-8"?>
<Linearlayout xmlns: Android = "<a href =" http://schemas.android.com/apk/res/android "> http://schemas.android.com/apk/res/android" </a>
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: text = "@ string/hello"
/>
<Button
Android: text = "button01"
Android: Id = "@ + ID/button01"
Android: layout_width = "wrap_content"
Android: layout_height = "wrap_content"
Android: onclick = "myclickh1"
/>
<Button
Android: text = "button02"
Android: Id = "@ + ID/button02"
Android: layout_width = "wrap_content"
Android: layout_height = "wrap_content"
Android: onclick = "myclick2"
/>
<Textview
Android: layout_width = "fill_parent"
Android: layout_height = "wrap_content"
Android: text = "@ string/hello"
/>
</Linearlayout>

The following two lines are new features:

Android: onclick = "myclick1"

Android: onclick = "myclick2"

2. Define the public methods myclick1 and myclick2 in the activity.

 

 

Import Android. App. activity;
Import Android. OS. Bundle;
Import Android. View. view;

Public class testonclicklistener extends activity {

@ Override
Public void oncreate (bundle savedinstancestate ){
Super. oncreate (savedinstancestate );
Setcontentview (R. layout. Main );

}
Public void myclickhandler01 (view v ){
Settitle ("myclick1 ");
}
Public void myclick2 (view v ){
Settitle ("myclick2 ");
}
}

 

 

Import Android. App. activity;
Import Android. OS. Bundle;
Import Android. View. view;

Public class testonclicklistener extends activity {

@ Override
Public void oncreate (bundle savedinstancestate ){
Super. oncreate (savedinstancestate );
Setcontentview (R. layout. Main );

}
Public void myclick1 (view v ){
Settitle ("myclick1 ");
}
Public void myclick2 (view v ){
Settitle ("myclick2 ");
}
}

You can also set the two buttons to the same listener Code as follows:

Android: onclick = "onclick"

Android: onclick = "onclick"

 

Import Android. App. activity;
Import Android. OS. Bundle;
Import Android. View. view;

Public class testonclicklistener extends activity {

@ Override
Public void oncreate (bundle savedinstancestate ){
Super. oncreate (savedinstancestate );
Setcontentview (R. layout. Main );
}
Public void myclickhandler (view v ){
Switch (V. GETID ()){
Case R. Id. button01:
Settitle ("click1 ");
Break;
Case R. Id. button2:
Settitle ("click2 ");
Break;
}
}
}