Android button Click event Three ways

One, in XML

< LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

<!--current order->

xmlns:tools="Http://schemas.android.com/tools"

android:layout_width="Match_parent" <!--full Screen overlay->

android:layout_height="Match_parent"

android:orientation="vertical" <!--vertical Distribution->

tools:context="${relativepackage}.${activityclass}">

< EditText

android:id="@+id/edit_text" <!--to get EditText-->

android:layout_width="Wrap_content" <!--Package Contents-->

android:layout_height="Wrap_content"

android:text="@string/hello_world1"/><!--Strings.xml introduced-->< C12>>

<Button

android:id="@+id/clear_button"

android:layout_width="Wrap_content"

android:layout_height="Wrap_content"

android:text="Click to clear Input"/>

</ LinearLayout>

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

In the corresponding. 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);//Get control

Button button = (button) Findviewbyid (r.id. Clear_button);

Button.setonclicklistener (new Button.onclicklistener () {//Create listener

Public void OnClick (View v) {

Edittext.settext ("");

}

});

};

}

There is no change in XML in. java

Button.setonclicklistener (listener);

Button.onclicklistener Listener = new Button.onclicklistener () {//Create Listener Object

Public void OnClick (View v) {

editText. SetText ("");

}

};

Third, the button revision in the XML is changed to

<button
Android:layout_width= "Wrap_content"
android:layout_height= "Wrap_content"
android:text= "@string/button_send"
android:onclick= "SendMessage"/>

The. java file

public void SendMessage (view view) {
editText. SetText ("");
}

Android button Click event Three ways