[Android] 核取對話框(checkbox dialog box)

核取對話框或勾選對話框，不是很確定是不是翻成這樣。

我們來舉一個例子：
每次啟動應用程式(APP)，都詢問是否瀏覽GOOGLE首頁，
當使用者勾選"不再顯示"，下一次進入到程式時，即不會再顯示此對話框。

MainActivity.java

package com.example.time;

import android.net.Uri;
import android.os.Bundle;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.CheckBox;

public class MainActivity extends Activity {
 boolean skipMessage;
 AlertDialog.Builder alert;
 public CheckBox dontShowAgain;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);

  // 宣告對話框
  CKDiagbox();

  // 如果沒有勾選"不再顯示",則顯示對話框
  if (!isCheckboxStateEnabled())
   alert.show();

 }

 public void CKDiagbox() {

  alert = new AlertDialog.Builder(this);
  LayoutInflater adbInflater = LayoutInflater.from(this);
  View checkboxLayout = adbInflater.inflate(R.layout.checkbox, null);
  dontShowAgain = (CheckBox) checkboxLayout.findViewById(R.id.skip);
  alert.setView(checkboxLayout);
  alert.setTitle(R.string.settitle);
  alert.setIcon(android.R.drawable.ic_dialog_alert);
  alert.setMessage(R.string.toGoogle);

  alert.setPositiveButton("離開", new DialogInterface.OnClickListener() {
   public void onClick(DialogInterface dialog, int which) {

    boolean checkBoxResult = false;
    if (dontShowAgain.isChecked())
     checkBoxResult = true;

    setCheckboxState(checkBoxResult);

    // 關閉對話框
    finish();
   }
  });

  alert.setNegativeButton("進入", new DialogInterface.OnClickListener() {
   public void onClick(DialogInterface dialog, int which) {
    boolean checkBoxResult = false;

    if (dontShowAgain.isChecked())
     checkBoxResult = true;

    setCheckboxState(checkBoxResult);

    Uri uri = Uri.parse("http://www.google.com/");
    Intent it = new Intent(Intent.ACTION_VIEW, uri);
    startActivity(it);

   }
  });

 }

 public void setCheckboxState(boolean chk) {
  // 記錄勾選方塊是否被打勾
  SharedPreferences settings = getSharedPreferences("showit", 0);
  SharedPreferences.Editor editor = settings.edit();
  editor.putBoolean("skipMessage", chk);
  editor.commit();
 }

 public boolean isCheckboxStateEnabled() {
  // 讀取勾選方塊是否被打勾,預設值是未打勾(fasle)
  SharedPreferences settings = getSharedPreferences("showit", 0);
  skipMessage = settings.getBoolean("skipMessage", false);

  return skipMessage;
 }

}

加入核取方塊 res/layout/checkbox.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal"
    android:paddingLeft="10dp"
    android:paddingRight="10dp" >
   
    <CheckBox
        android:id="@+id/skip"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/checkbox" >
    </CheckBox>

</LinearLayout>

res/values/strings.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="app_name">checkbox dialog box</string>
    <string name="hello_world">Hello world!</string>
    <string name="menu_settings">Settings</string>
    <string name="checkbox">不在顯示</string>
    <string name="toGoogle">是否前往GOOGLE首頁</string>
 <string name="settitle">歡迎</string>
</resources>

結果: