java - 即使应用程序关闭后如何保存复选框状态

Question

大家好，请帮助我了解如何保存我的复选框状态，当我离开 Activity 、刷新或关闭应用程序时，我的复选框会重置为未选中状态。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

为此使用共享首选项:

要将数据写入共享首选项，请使用以下示例:

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();

要读取共享首选项:

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