学步园

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    
    <TextView 
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="选择编程语言"/>
    <CheckBox android:id="@+id/cb_1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="C"
        />
    <CheckBox android:id="@+id/cb_2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="c++"
        />
    <CheckBox android:id="@+id/cb_3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Java"
        />
    <CheckBox android:id="@+id/cb_4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="c#"
        />
</LinearLayout>

MainActivity

package com.kai.tan.checkbox;

import android.app.Activity;
import android.os.Bundle;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.Toast;
import android.widget.CompoundButton.OnCheckedChangeListener;

public class MainActivity extends Activity {
	
	CheckBox cb_1;
	CheckBox cb_2;
	CheckBox cb_3;
	CheckBox cb_4;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		cb_1 = (CheckBox)findViewById(R.id.cb_1);
		cb_2 = (CheckBox)findViewById(R.id.cb_2);
		cb_3 = (CheckBox)findViewById(R.id.cb_3);
		cb_4 = (CheckBox)findViewById(R.id.cb_4);
		
		cb_1.setOnCheckedChangeListener(listener);
		cb_2.setOnCheckedChangeListener(listener);
		cb_3.setOnCheckedChangeListener(listener);
		cb_4.setOnCheckedChangeListener(listener);
		
	}
	
	private String getCbText(int id){
		return "你点了：" + ((CheckBox)findViewById(id)).getText().toString();
	}
	
	private OnCheckedChangeListener listener = new OnCheckedChangeListener() {
		
		@Override
		public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
			Toast.makeText(MainActivity.this, getCbText(buttonView.getId()), 1000).show();
		}
	};
}