UI Events Handling (Listener)

listener

View.OnclickListener : 클릭에 대한 반응

View.OnFocusChangelistener :  입력 초점의 변경에 대한 반응.

View.OnkeyListener : key에 대한 반응

View.OnLongClickListner :  긴 클릭에 대한 반응.

View.OnTouchListener : 터치에 대한 반응.

Exanple : OnclickListener

————AndroidManifest.xml————«

<?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:id=”@+id/Button01”

android:layout_width=”fill_parent”

android:layout_height=”wrap_content”

android:text=”저장”

/>

</LinearLayout>

————WidgetTest.java————«

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style 1

---

package com.sulac.WidgetTest;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

public class WidgetTest extends Activity {

Button btn;

int flag = 0;

–* Called when the activity is first created. –

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

btn = (Button)findViewById(R.id.Button01);

btn.setText(“android”);

btn.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

if(flag==0){

btn.setText(“android 0”);

flag = 1;

}else

{

btn.setText(“android 1”);

flag = 0;

}

}

});

}

}

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style 2

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package com.sulac.WidgetTest;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

public class WidgetTest extends Activity {

Button btn;

int flag = 0;

–* Called when the activity is first created. –

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

btn = (Button)findViewById(R.id.Button01);

btn.setText(“android”);

btn.setOnClickListener(sulac);

}

OnClickListener sulac = new View.OnClickListener() {

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

if(flag==0){

btn.setText(“android 0”);

flag = 1;

}else

{

btn.setText(“android 1”);

flag = 0;

}

}

};

}

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style 3

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package com.sulac.WidgetTest;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

public class WidgetTest extends Activity implements View.OnClickListener{

Button btn;

int flag = 0;

–* Called when the activity is first created. –

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

btn = (Button)findViewById(R.id.Button01);

btn.setText(“android”);

btn.setOnClickListener(this);

}

public void onClick(View v) {

// TODO Auto-generated method stub

if(flag==0){

btn.setText(“android 0”);

flag = 1;

}else

{

btn.setText(“android 1”);

flag = 0;

}

}

}

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