玩转Android---UI篇---CheckBox（多选按钮）

 

 

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：