1 package com.example.android_checkbox;
  2 
  3 import android.os.Bundle;
  4 import android.view.Gravity;
  5 import android.view.View;
  6 import android.view.View.OnClickListener;
  7 import android.widget.Button;
  8 import android.widget.CheckBox;
  9 import android.widget.CompoundButton;
 10
 
 import android.widget.Toast;
 11 import android.widget.CompoundButton.OnCheckedChangeListener;
 12 import android.widget.TextView;
 13 import android.app.Activity;
 14 
 15 public class MainActivity extends Activity {
 16 
 17     TextView mTextView;                   //TextView物件，用於顯示問題
 18     CheckBox mCheckBox1;              //
 
CheckBox物件，用於顯示選項1
 19     CheckBox mCheckBox2;              //CheckBox物件，用於顯示選項2
 20     CheckBox mCheckBox3;              //CheckBox物件，用於顯示選項3
 21     CheckBox mCheckBox4;              //CheckBox物件，用於顯示選項4
 22     Button mButton;                              //Button物件，用於顯示提交按鈕
 23     
 24     int checkedcount = 0;                    //
 
計數器，用於統計選中的個數
 25     
 26     @Override
 27     public void onCreate(Bundle savedInstanceState) {
 28         super.onCreate(savedInstanceState);
 29         setContentView(R.layout.activity_main);//載入佈局檔案
 30         
 31         //載入控制元件
 32         mTextView = (TextView)this.findViewById(R.id.textview);
 33         mCheckBox1 = (CheckBox)this.findViewById(R.id.checkbox1);
 34         mCheckBox2 = (CheckBox)this.findViewById(R.id.checkbox2);        
 35         mCheckBox3 = (CheckBox)this.findViewById(R.id.checkbox3);     
 36         mCheckBox4 = (CheckBox)this.findViewById(R.id.checkbox4);   
 37         mButton = (Button)this.findViewById(R.id.button);
 38         
 39         //選項1事件監聽
 40         mCheckBox1.setOnCheckedChangeListener(new OnCheckedChangeListener() {
 41             public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
 42                 if (mCheckBox1.isChecked()) {
 43                     checkedcount++;
 44                     DisplayToast("你選擇了：" + mCheckBox1.getText());
 45                 } else {
 46                     checkedcount--;
 47                 }
 48             }
 49         });
 50 
 51         //選項2事件監聽
 52         mCheckBox2.setOnCheckedChangeListener(new OnCheckedChangeListener() {
 53             public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
 54                 if (mCheckBox2.isChecked()) {
 55                     checkedcount++;
 56                     DisplayToast("你選擇了：" + mCheckBox2.getText());
 57                 } else {
 58                     checkedcount--;
 59                 }
 60             }
 61         });
 62         
 63         //選項3事件監聽
 64         mCheckBox3.setOnCheckedChangeListener(new OnCheckedChangeListener() {
 65             public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
 66                 if (mCheckBox3.isChecked()) {
 67                     checkedcount++;
 68                     DisplayToast("你選擇了：" + mCheckBox3.getText());
 69                 } else {
 70                     checkedcount--;
 71                 }            
 72             }
 73         });
 74         
 75         //選項4事件監聽
 76         mCheckBox4.setOnCheckedChangeListener(new OnCheckedChangeListener() {
 77             public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
 78                 if (mCheckBox4.isChecked()) {
 79                     checkedcount++;
 80                     DisplayToast("你選擇了：" + mCheckBox4.getText());
 81                 } else {
 82                     checkedcount--;
 83                 }
 84             }
 85         });
 86         
 87         //”提交“按鈕事件監聽
 88         mButton.setOnClickListener(new OnClickListener() {
 89             public void onClick(View v) {
 90                 DisplayToast("謝謝參與，你一共選擇了" + checkedcount + "項！");
 91             }
 92         });
 93     }
 94     
 95     //顯示提示資訊
 96     public void DisplayToast(String string) {
 97         Toast mToast = Toast.makeText(this, string, Toast.LENGTH_LONG);
 98         mToast.setGravity(Gravity.TOP, 0, 450);
 99         mToast.show();
100     }  
101 }