如何保存复选框的状态，即使应用程序关闭

Question

你好任何人都可以请帮助我如何保存我的复选框状态，当我离开活动，刷新或关闭应用程序我的cckckbox重置为取消选中。我尝试四处搜索，但无法保存，下面是我的代码

package com.example.android.xb; 

import android.app.AlarmManager; 
import android.app.Dialog; 
import android.app.PendingIntent; 
import android.app.TimePickerDialog; 
import android.content.Intent; 
import android.os.Bundle; 
import android.support.v7.app.AppCompatActivity; 
import android.view.View; 
import android.widget.CheckBox; 
import android.widget.TextView; 
import android.widget.TimePicker; 

import java.util.Calendar; 

public class RemindersActivity extends AppCompatActivity { 

    Calendar calender = Calendar.getInstance(); 

    private TextView timePicker; 


    private int pHour; 
    private int pMinute; 

    static final int TIME_DIALOG_ID = 0; 

    private TimePickerDialog.OnTimeSetListener mTimeSetListener = 
      new TimePickerDialog.OnTimeSetListener() { 
       @Override 
       public void onTimeSet(TimePicker view, int hourOfDay, int minute) { 

        pHour = hourOfDay; 
        pMinute = minute; 
        updateDisplay(); 

       } 
      }; 

    private void updateDisplay() { 
     timePicker.setText(new StringBuilder() 
       .append(pad(pHour)).append(":") 
       .append(pad(pMinute))); 
    } 

    private static String pad(int c) { 
     if (c >= 10) 
      return String.valueOf(c); 
     else 
      return "0" + String.valueOf(c); 
    } 

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


     // Display for up button 
     getSupportActionBar().setDisplayHomeAsUpEnabled(true); 

     // Setting up the onlick listener 
     findViewById(R.id.checkbox_alert).setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 

       if (((CheckBox) view).isChecked()) { 


        // Time setup for notification to pop up 
        calender.set(Calendar.HOUR_OF_DAY, pHour); 
        calender.set(Calendar.MINUTE, pMinute); 

        // Setting up the notification on checkbox checked 
        Intent intent = new Intent(getApplicationContext(), NotificationReceiver.class); 

        PendingIntent pendingIntent = PendingIntent.getBroadcast(getApplicationContext(), 100, 
          intent, PendingIntent.FLAG_UPDATE_CURRENT); 

        AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE); 
        alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, calender.getTimeInMillis(), 
          alarmManager.INTERVAL_DAY, pendingIntent); 


       } 
      } 


     }); 

     // Setting up the onclick listener for time textView 
     timePicker = (TextView) findViewById(R.id.time_set); 

     timePicker.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       showDialog(TIME_DIALOG_ID); 
      } 
     }); 

     final Calendar calendar = Calendar.getInstance(); 
     pHour = calendar.get(Calendar.HOUR_OF_DAY); 
     pMinute = calendar.get(Calendar.MINUTE); 

     updateDisplay(); 

    } 

    @Override 
    protected Dialog onCreateDialog(int id) { 
     switch (id) { 
      case TIME_DIALOG_ID: 
       return new TimePickerDialog(this, mTimeSetListener, pHour, pMinute, false); 

     } 
     return null; 
    } 
} 

Answer 1

使用共享偏好：

要将数据写入共享偏好使用例如：

SharedPreferences sharedPref = activity.getPreferences(Context.MODE_PRIVATE); 
SharedPreferences.Editor editor = sharedPref.edit(); 
editor.putBoolean("checkbox", checkbox.isChecked())); //first value -preference name, secend value -preference value 
editor.commit(); 

要从共享偏好阅读：

SharedPreferences sharedPref = activity.getPreferences(Context.MODE_PRIVATE); 
boolean isMyValueChecked = sharedPref.getBoolean("checkbox", false);//first value -preference name, secend value - default value if checbox not found 

Answer 2

每次更新时都可以将结果保存在SharedPreferences中。即使您的应用程序被杀死，它也会存储在那里。您可以在每次再次开始活动时检查SharedPreferences中的值并相应地设置检查。

建立SharedPreference：

SharedPreferences sharedPref = getActivity().getPreferences(Context.MODE_PRIVATE); 

更新或编辑sharedPreferences，您可以添加这时候只要你更新检查按钮，或在您的onClick：

SharedPreferences sharedPref = getActivity().getPreferences(Context.MODE_PRIVATE); 
SharedPreferences.Editor editor = sharedPref.edit(); 
editor.putBoolean("checkBox1", true); 
editor.commit(); 

你可以从sharedPreference阅读：

Boolean defaultValue = sharedPref.getBoolean("checkBox1", defaultValue); 

你也可以看看Android documentation或tutorial。此

Answer 3

你必须使用SharedPreferences为Micha，skbrhmn和Sabriael建议你这样做。请按照下面链接中的指南来帮助您如何做到这一点。

https://developer.android.com/training/basics/data-storage/shared-preferences.html

更多SharedPreferences接口的详细信息...

https://developer.android.com/reference/android/content/SharedPreferences.html