玩转Android---UI篇---CheckBox（多选按钮）

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多选按钮CheckBox的可以实现多项选择，我们可以现在布局文件中定义多选按钮，然后对每一个多选按钮进行事件监听

setOnCheckedChangeListener，通过isChecked来判断选项是否被选中

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下面是一个例子，可以很好的理解CheckBox的使用

CheckBoxTest.java

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package org.loulijun.checkbox;import android.app.Activity;import android.os.Bundle;import android.view.Gravity;import android.view.View;import android.widget.Button;import android.widget.CheckBox;import android.widget.CompoundButton;import android.widget.TextView;import android.widget.Toast;public class CheckBoxTest extends Activity {    /** Called when the activity is first created. */TextView textview;Button submit;CheckBox checkbox1;CheckBox checkbox2;CheckBox checkbox3;CheckBox checkbox4;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                textview=(TextView)findViewById(R.id.textview);        submit=(Button)findViewById(R.id.submit);                //取得每一个CheckBox对象        checkbox1=(CheckBox)findViewById(R.id.checkbox1);        checkbox2=(CheckBox)findViewById(R.id.checkbox2);        checkbox3=(CheckBox)findViewById(R.id.checkbox3);        checkbox4=(CheckBox)findViewById(R.id.checkbox4);                //为每一个选项设置监听        checkbox1.setOnCheckedChangeListener(new CheckBox.OnCheckedChangeListener()        {@Overridepublic void onCheckedChanged(CompoundButton buttonView,boolean isChecked) {// TODO Auto-generated method stubif(checkbox1.isChecked()){DisplayToast("你选择了："+checkbox1.getText());}}                });                checkbox2.setOnCheckedChangeListener(new CheckBox.OnCheckedChangeListener()        {@Overridepublic void onCheckedChanged(CompoundButton buttonView,boolean isChecked) {// TODO Auto-generated method stubif(checkbox2.isChecked()){DisplayToast("你选择了："+checkbox2.getText());}}                });                checkbox3.setOnCheckedChangeListener(new CheckBox.OnCheckedChangeListener()        {@Overridepublic void onCheckedChanged(CompoundButton buttonView,boolean isChecked) {// TODO Auto-generated method stubif(checkbox3.isChecked()){DisplayToast("你选择了："+checkbox3.getText());}}                });                checkbox4.setOnCheckedChangeListener(new CheckBox.OnCheckedChangeListener()        {@Overridepublic void onCheckedChanged(CompoundButton buttonView,boolean isChecked) {// TODO Auto-generated method stubif(checkbox4.isChecked()){DisplayToast("你选择了："+checkbox4.getText());}}                });                submit.setOnClickListener(new Button.OnClickListener()        {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubint num=0;if(checkbox1.isChecked()){num++;}if(checkbox2.isChecked()){num++;}if(checkbox3.isChecked()){num++;}if(checkbox4.isChecked()){num++;}DisplayToast("您一共选择了"+num+"款Android手机!");}                });    }    public void DisplayToast(String str)    {    Toast toast=Toast.makeText(this, str, Toast.LENGTH_SHORT);    //设置Toast的显示位置    toast.setGravity(Gravity.TOP, 0, 220);    //显示Toast    toast.show();    }}

?main.xml布局文件

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<?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"    ><TextView  android:id="@+id/textview"    android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:text="@string/hello"    /><CheckBoxandroid:id="@+id/checkbox1"android:layout_width="fill_parent"android:layout_height="wrap_content"android:text="@string/checkbox1"/><CheckBoxandroid:id="@+id/checkbox2"android:layout_width="fill_parent"android:layout_height="wrap_content"android:text="@string/checkbox2"/><CheckBoxandroid:id="@+id/checkbox3"android:layout_width="fill_parent"android:layout_height="wrap_content"android:text="@string/checkbox3"/><CheckBoxandroid:id="@+id/checkbox4"android:layout_width="fill_parent"android:layout_height="wrap_content"android:text="@string/checkbox4"/><Buttonandroid:id="@+id/submit"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_gravity="center"android:text="提交信息"/></LinearLayout>

?strings.xml文件

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<?xml version="1.0" encoding="utf-8"?><resources>    <string name="hello">调查：你喜欢Android的那款手机？</string>    <string name="app_name">CheckBoxTest</string>    <string name="checkbox1">HTC desire HD</string>    <string name="checkbox2">Google nexus one</string>    <string name="checkbox3">HTC defy</string>    <string name="checkbox4">摩托罗拉里程碑II</string></resources>

?运行结果如下：

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