玩转Android-UI篇-CheckBox（多选旋钮）

?

?

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

?

下面是一个例子，可以很好的理解CheckBox的使用

CheckBoxTest.java

?

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()        {			@Override			public void onCheckedChanged(CompoundButton buttonView,					boolean isChecked) {				// TODO Auto-generated method stub				if(checkbox1.isChecked())				{					DisplayToast("你选择了："+checkbox1.getText());				}			}        	        });                checkbox2.setOnCheckedChangeListener(new CheckBox.OnCheckedChangeListener()        {			@Override			public void onCheckedChanged(CompoundButton buttonView,					boolean isChecked) {				// TODO Auto-generated method stub				if(checkbox2.isChecked())				{					DisplayToast("你选择了："+checkbox2.getText());				}			}        	        });                checkbox3.setOnCheckedChangeListener(new CheckBox.OnCheckedChangeListener()        {			@Override			public void onCheckedChanged(CompoundButton buttonView,					boolean isChecked) {				// TODO Auto-generated method stub				if(checkbox3.isChecked())				{					DisplayToast("你选择了："+checkbox3.getText());				}			}        	        });                checkbox4.setOnCheckedChangeListener(new CheckBox.OnCheckedChangeListener()        {			@Override			public void onCheckedChanged(CompoundButton buttonView,					boolean isChecked) {				// TODO Auto-generated method stub				if(checkbox4.isChecked())				{					DisplayToast("你选择了："+checkbox4.getText());				}			}        	        });                submit.setOnClickListener(new Button.OnClickListener()        {			@Override			public void onClick(View v) {				// TODO Auto-generated method stub				int 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

?

<?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"    /><CheckBox	android:id="@+id/checkbox1"	android:layout_width="fill_parent"	android:layout_height="wrap_content"	android:text="@string/checkbox1"/><CheckBox	android:id="@+id/checkbox2"	android:layout_width="fill_parent"	android:layout_height="wrap_content"	android:text="@string/checkbox2"/><CheckBox	android:id="@+id/checkbox3"	android:layout_width="fill_parent"	android:layout_height="wrap_content"	android:text="@string/checkbox3"/><CheckBox	android:id="@+id/checkbox4"	android:layout_width="fill_parent"	android:layout_height="wrap_content"	android:text="@string/checkbox4"/><Button	android: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

?

<?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：

?