Android 之 CheckBox 详解

CheckBox，也就是多项选择。Android中提供了ChechBox控件，使用起来非常方便。这里还是老规矩，用一个Demo来演示

1：新建一个工程：CheckBoxDemo

2:布局文件如下：

<?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"
    >
<TextView android:text="@+id/TextView01" android:id="@+id/TextView01" android:layout_width="wrap_content" android:layout_height="wrap_content"></TextView>
<CheckBox android:text="@+id/CheckBox01" android:id="@+id/CheckBox01" android:layout_width="wrap_content" android:layout_height="wrap_content"></CheckBox>
<CheckBox android:text="@+id/CheckBox02" android:id="@+id/CheckBox02" android:layout_width="wrap_content" android:layout_height="wrap_content"></CheckBox>
<CheckBox android:text="@+id/CheckBox03" android:id="@+id/CheckBox03" android:layout_width="wrap_content" android:layout_height="wrap_content"></CheckBox>
<CheckBox android:text="@+id/CheckBox04" android:id="@+id/CheckBox04" android:layout_width="wrap_content" android:layout_height="wrap_content"></CheckBox>
<Button android:text="@+id/Button01" android:id="@+id/Button01" android:layout_width="wrap_content" android:layout_height="wrap_content"></Button>
</LinearLayout>

 

3:源代码如下：这种是常见的一种表达形式。

package com.rocky.studio.ch426;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.TextView;
import android.widget.Toast;
public class CheckBoxDemo extends Activity {
	
	private TextView m_txtView;
	private CheckBox m_CheckBox1;
	private CheckBox m_CheckBox2;
	private CheckBox m_CheckBox3;
	private CheckBox m_CheckBox4;
	private Button m_Button;
	
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        m_txtView=(TextView)this.findViewById(R.id.TextView01);
        
        m_CheckBox1=(CheckBox)this.findViewById(R.id.CheckBox01);
        m_CheckBox2=(CheckBox)this.findViewById(R.id.CheckBox02);
        m_CheckBox3=(CheckBox)this.findViewById(R.id.CheckBox03);
        m_CheckBox4=(CheckBox)this.findViewById(R.id.CheckBox04);
        
        m_txtView.setText("调查：你喜欢Android是因为什么原因？");
        m_CheckBox1.setText("好看");
        m_CheckBox2.setText("好用");
        m_CheckBox3.setText("免费");
        m_CheckBox4.setText("应用广泛");
        
        m_CheckBox1.setOnCheckedChangeListener(m_checkboxListener);
        m_CheckBox2.setOnCheckedChangeListener(m_checkboxListener);
        m_CheckBox3.setOnCheckedChangeListener(m_checkboxListener);
        m_CheckBox4.setOnCheckedChangeListener(m_checkboxListener);
                
        m_Button=(Button)this.findViewById(R.id.Button01);        
        m_Button.setOnClickListener(m_BtnListener);
        m_Button.setText("提交");
    }
    
    private OnClickListener m_BtnListener=new OnClickListener()
    {
		public void onClick(View arg0) {
			// TODO Auto-generated method stub
			
			if(arg0.getId()==R.id.Button01)
			{
				int value=0;
				
				if(m_CheckBox1.isChecked())
				{
					value++;
				}
				if(m_CheckBox2.isChecked())
				{
					value++;
				}
				if(m_CheckBox3.isChecked())
				{
					value++;
				}
				if(m_CheckBox4.isChecked())
				{
					value++;
				}
				
				Toast.makeText(getBaseContext(), "你选择了 "+value+"项", Toast.LENGTH_SHORT).show();
				
			}			
		}    	
    };
    private CheckBox.OnCheckedChangeListener m_checkboxListener =new  CheckBox.OnCheckedChangeListener()
    {
		public void onCheckedChanged(CompoundButton buttonView,
				boolean isChecked) {
			// TODO Auto-generated method stub
			
			if(buttonView.getId()==R.id.CheckBox01)
			{
				if(isChecked)
				{
					Toast.makeText(getBaseContext(), "CheckBox 01 check ", Toast.LENGTH_SHORT).show();
				}
				else
				{
					Toast.makeText(getBaseContext(), "CheckBox 01 ucheck ", Toast.LENGTH_SHORT).show();
				}
			}
			if(buttonView.getId()==R.id.CheckBox02)
			{
				if(isChecked)
				{
					Toast.makeText(getBaseContext(), "CheckBox 02 check ", Toast.LENGTH_SHORT).show();
				}
				else
				{
					Toast.makeText(getBaseContext(), "CheckBox 02 ucheck ", Toast.LENGTH_SHORT).show();
				}
			}
			if(buttonView.getId()==R.id.CheckBox03)
			{
				if(isChecked)
				{
					Toast.makeText(getBaseContext(), "CheckBox 03 check ", Toast.LENGTH_SHORT).show();
				}
				else
				{
					Toast.makeText(getBaseContext(), "CheckBox 03 ucheck ", Toast.LENGTH_SHORT).show();
				}
			}
			if(buttonView.getId()==R.id.CheckBox04)
			{
				if(isChecked)
				{
					Toast.makeText(getBaseContext(), "CheckBox 04 check ", Toast.LENGTH_SHORT).show();
				}
				else
				{
					Toast.makeText(getBaseContext(), "CheckBox 04 ucheck ", Toast.LENGTH_SHORT).show();
				}
			}
						
			
		}
    	
    };

}