Android Button click event in three ways

Android Button click event in three ways

1. in XML

>

Xmlns: tools = "http://schemas.android.com/tools"

Android: layout_width = "match_parent" >

Android: layout_height = "match_parent"

Android: orientation = "vertical" >

Tools: context = "$ {relativePackage}. $ {activityClass}">

Android: id = "@ + id/edit_text" >

Android: layout_width = "wrap_content" >

Android: layout_height = "wrap_content"

Android: text = "@ string/hello_world1"/> >

Android: id = "@ + id/clear_button"

Android: layout_width = "wrap_content"

Android: layout_height = "wrap_content"

Android: text = "click to clear input"/>

//---------------------------------------------------------

In. java

Package com. example. myandroid;

Import android. app. Activity;

Import android. OS. Bundle;

Import android. view. Menu;

Import android. view. MenuItem;

Import android. view. View;

Import android. view. View. OnClickListener;

Import android. widget. Button;

Import android. widget. EditText;

Public class MainActivityextends Activity {

@ Override

Protected void onCreate (Bundle savedInstanceState ){

Super. onCreate (savedInstanceState );

SetContentView (R. layout. activity_main );

Final EditText editText = (EditText) findViewById (R. id. edit_text); // obtain the control

Button button = (Button) findViewById (R. id. clear_button );

Button. setOnClickListener (new Button. OnClickListener () {// create a listener

Public void onClick (View v ){

EditText. setText ("");

}

});

};

}

2. xml does not change in. java

Button. setOnClickListener (listener );

Button. OnClickListener listener = new Button. OnClickListener () {// create a listener object

Public void onClick (View v ){

EditText. setText ("");

}

};

3. Modify the button in xml

Android: layout_width = "wrap_content"
Android: layout_height = "wrap_content"
Android: text = "@ string/button_send"
Android: onClick = "sendMessage"/>

. Java File

Public void sendMessage (View view ){
EditText. setText ("");
}