android应用开发揭秘examples_04-08笔记(CheckBox的使用)

与前一个例子的RadioBox比起来，这个CheckBox没有什么要多讲的，每一个checkbox 都是独立的处理过程



package com.yarin.android.Examples_04_08;

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 Activity01 extends Activity
{
//用来显示题目
TextView m_TextView1;
//“提交按钮”
Button m_Button1;
//4个多选项
CheckBox m_CheckBox1;
CheckBox m_CheckBox2;
CheckBox m_CheckBox3;
CheckBox m_CheckBox4;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

m_TextView1 = (TextView) findViewById(R.id.TextView1);
m_Button1 = (Button) findViewById(R.id.button1);

/* 取得每个CheckBox对象 */
m_CheckBox1 = (CheckBox) findViewById(R.id.CheckBox1);
m_CheckBox2 = (CheckBox) findViewById(R.id.CheckBox2);
m_CheckBox3 = (CheckBox) findViewById(R.id.CheckBox3);
m_CheckBox4 = (CheckBox) findViewById(R.id.CheckBox4);

m_CheckBox1.setChecked(true);
m_CheckBox4.setChecked(true);
//对每个选项设置事件监听
m_CheckBox1.setOnCheckedChangeListener(new CheckBox.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked)
{
if(m_CheckBox1.isChecked())
{
DisplayToast("你选择了："+m_CheckBox1.getText());
}
}
});
////////////////////
m_CheckBox2.setOnCheckedChangeListener(new CheckBox.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked)
{
if(m_CheckBox2.isChecked())
{
DisplayToast("你选择了："+m_CheckBox2.getText());
}
}
});
/////////////////
m_CheckBox3.setOnCheckedChangeListener(new CheckBox.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked)
{
if(m_CheckBox3.isChecked())
{
DisplayToast("你选择了："+m_CheckBox3.getText());
}
}
});
////////////////

m_CheckBox4.setOnCheckedChangeListener(new MyClass());//对第4个checkbox变换一下写法练习一下

//对按钮设置事件监听
m_Button1.setOnClickListener(new Button.OnClickListener() {
public void onClick(View v)
{
int num = 0;
if(m_CheckBox1.isChecked())
{
num++;
}
if(m_CheckBox2.isChecked())
{
num++;
}
if(m_CheckBox3.isChecked())
{
num++;
}
if(m_CheckBox4.isChecked())
{
num++;
}
DisplayToast("谢谢参与！你一共选择了"+num+"项！");
}
});
}

class MyClass implements CheckBox.OnCheckedChangeListener
{

@Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
// TODO Auto-generated method stub
if(m_CheckBox4.isChecked())
{
DisplayToast("你选择了："+m_CheckBox4.getText());
}
else
{
DisplayToast("我晕，你怎么不选这项了! "+m_CheckBox4.getText());
}
}

}

/* 显示Toast */
public void DisplayToast(String str)
{
Toast toast = Toast.makeText(this, str, Toast.LENGTH_SHORT);
//设置toast显示的位置
toast.setGravity(Gravity.TOP, 0, 220);
//显示该Toast
toast.show();
}
}