android CheckBox控件的定义及事件监听
android CheckBox控件的定义及事件监听,本例实现CheckBox控件的定义及点击事件的监听并显示结果,运行效果截图如下:
CheckBox控件的定义,main.xml内容如下:
- <?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"
- >
- <EditText
- android:id="@+id/editText1"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"
- android:text="请选择"
- />
- <CheckBox
- android:id="@+id/beijing"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:text="北京"
- />
- <CheckBox
- android:id="@+id/shanghai"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:text="上海"
- />
- <CheckBox
- android:id="@+id/shenzhen"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:text="深圳"
- />
- </LinearLayout>
activity CheckBoxTest.java内容如下:
- package checkbox.pack;
- import android.app.Activity;
- import android.os.Bundle;
- import android.widget.CheckBox;
- import android.widget.CompoundButton;
- import android.widget.EditText;
- public class CheckBoxTest extends Activity {
- //对控件对象进行声明
- CheckBox beijing=null;
- CheckBox shanghai=null;
- CheckBox shenzhen=null;
- EditText editText1=null;
- @Override
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
- //通过控件的ID来得到代表控件的对象
- beijing=(CheckBox)findViewById(R.id.beijing);
- shanghai=(CheckBox)findViewById(R.id.shanghai);
- shenzhen=(CheckBox)findViewById(R.id.shenzhen);
- editText1=(EditText)findViewById(R.id.editText1);
- //给CheckBox设置事件监听
- beijing.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener(){
- @Override
- public void onCheckedChanged(CompoundButton buttonView,
- boolean isChecked) {
- // TODO Auto-generated method stub
- if(isChecked){
- editText1.setText(buttonView.getText()+"选中");
- }else{
- editText1.setText(buttonView.getText()+"取消选中");
- }
- }
- });
- shanghai.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener(){
- @Override
- public void onCheckedChanged(CompoundButton buttonView,
- boolean isChecked) {
- // TODO Auto-generated method stub
- if(isChecked){
- editText1.setText(buttonView.getText()+"选中");
- }else{
- editText1.setText(buttonView.getText()+"取消选中");
- }
- }
- });
- shenzhen.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener(){
- @Override
- public void onCheckedChanged(CompoundButton buttonView,
- boolean isChecked) {
- // TODO Auto-generated method stub
- if(isChecked){
- editText1.setText(buttonView.getText()+"选中");
- }else{
- editText1.setText(buttonView.getText()+"取消选中");
- }
- }
- });
- }
- }
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