Three methods for triggering onclick events in Activity

Java files

Package COM. wyw. demo; import android. app. activity; import android. OS. bundle; import android. view. view; import android. widget. button; import android. widget. edittext; public class activity extends activity {/** called when the activity is first created. */edittext EV1; @ override public void oncreate (bundle savedinstancestate) {super. oncreate (savedinstancestate); setcontentview (R. layout. main); EV1 = (edittext) findviewbyid (R. id. edittext01); // The first method: button btn1 = (button) findviewbyid (R. id. button01); // obtain the button resource btn1.setonclicklistener (New button. onclicklistener () {// create a listener @ override public void onclick (view v) {string strtmp = "Click button01"; ev1.settext (strtmp );}}); // Method 2: button btn2 = (button) findviewbyid (R. id. button02); // get button resource btn2.setonclicklistener (listener); // set listener} button. onclicklistener listener = new button. onclicklistener () {// create a listener object @ override public void onclick (view v) {string strtmp = "Click button02"; ev1.settext (strtmp );}}; // method 3 (available in android1.6 and later versions) Public void btn3onclick (view) {string strtmp = "Click button03"; ev1.settext (strtmp );}}

XML file

<?xml version="1.0" encoding="utf-8"?>  <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"      android:orientation="vertical" android:layout_width="fill_parent"      android:layout_height="fill_parent">      <Button android:text="Button01"               android:id="@+id/Button01"              android:layout_width="wrap_content"               android:layout_height="wrap_content">      </Button>            <Button android:text="Button02"               android:id="@+id/Button02"              android:layout_width="wrap_content"               android:layout_height="wrap_content">      </Button>            <Button android:text="Button03"               android:id="@+id/Button03"              android:layout_width="wrap_content"               android:layout_height="wrap_content"              android:onClick="Btn3OnClick">      </Button>        <EditText android:text="@+id/EditText01"               android:id="@+id/EditText01"               android:layout_width="wrap_content"               android:layout_height="wrap_content">      </EditText>  </LinearLayout>