android - getParcelableExtra 在 Pending Intent 上总是 null，但不是 Intent

Question

我是 Java 的新手，更不用说 Android 开发了。我没有编码背景，但我想我会从像闹钟这样的“简单”东西开始。所以现在我正在写一个闹钟，如果闹钟响起后没有重复，我想将闹钟更新为非 Activity 状态。当我有意向将可打包的 AlarmClass(我的警报对象)传递到警报设置屏幕时，它通过得很好。 当我将相同的 AlarmClass 传递给 Intent ，并将其放入警报管理器中的 PendingIntent 中，然后尝试从可以关闭警报的屏幕中获取它时，我正在调用和填充的 AlarmClass 对象完全相同始终为空。

这是我的闹钟类:

package com.example.wakeme;

import java.util.Calendar;

import android.os.Parcel;
import android.os.Parcelable;

public class AlarmClass implements Parcelable{
    Calendar cal = Calendar.getInstance();
    private long id = 1;
    private int active = 1;
    private long time = cal.getTimeInMillis();
    private int repeating = 0;
    private int skipweekends = 0;
    private int skipweekdays = 0;
    private int alarmnumber = -1;


    public long getId(){
        return id;
    }

    public void setId(long id) {
        this.id = id;
    }

    public int getActive(){
        return active;
    }

    public void setActive(int active) {
        this.active = active;
    }

    public int getRepeating(){
        return repeating;
    }

    public void setRepeating(int repeating){
        this.repeating = repeating;
    }

    public void setTime(long time){
        this.time = time;
    }

    public long getTime(){
        return time;
    }

    public int getSkipWeekends(){
        return skipweekends;
    }

    public void setSkipWeekends(int skipweekends){
        this.skipweekends = skipweekends;
    }

    public int getSkipWeekdays(){
        return skipweekdays;
    }

    public void setSkipWeekdays(int skipweekdays){
        this.skipweekdays = skipweekdays;
    }

    public void setAlarmNumber(int alarmnumber){
        this.alarmnumber = alarmnumber;
    }

    public int getAlarmNumber(){
        return alarmnumber;
    }

    @Override
    public int describeContents(){
        return 0;
    }

    private AlarmClass(Parcel in){
        this.id = in.readLong();
        this.active = in.readInt();
        this.repeating = in.readInt();
        this.skipweekdays = in.readInt();
        this.skipweekends = in.readInt();
        this.time = in.readLong();
        this.alarmnumber = in.readInt();
    }

    AlarmClass() {
        return;
    }

    public void writeToParcel(Parcel out, int flags) {
        out.writeLong(this.id);
        out.writeInt(this.active);
        out.writeInt(this.repeating);
        out.writeInt(this.skipweekdays);
        out.writeInt(this.skipweekends);
        out.writeLong(this.time);
        out.writeInt(this.alarmnumber);
    }

    public static final Parcelable.Creator<AlarmClass> CREATOR = new Parcelable.Creator<AlarmClass>(){
        public AlarmClass createFromParcel(Parcel in){
            return new AlarmClass(in);
        }
        public AlarmClass[] newArray(int size) {
            return new AlarmClass[size];
        }
    };

从这里，我可以将我的对象传递给闹钟 setter 来更新它:

public void startSet(View view){
        Intent set = new Intent(this, SetAlarm.class);
        set.putExtra("alarm", new AlarmClass());
        startActivity(set);
    }

我在我的时间 setter 上收到它就很好。它是非空的:

public class SetAlarm extends MainActivity {
    AlarmClass passAlarm = new AlarmClass();


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.alarm_set);
        setAlarmSetListener();
        setDeleteListener();
        passAlarm = (AlarmClass) getIntent().getParcelableExtra("alarm");
        if(passAlarm.getAlarmNumber() != -1){
            TimePicker picker = (TimePicker) findViewById(R.id.timePicker1);
            Calendar passedTime = Calendar.getInstance();
            passedTime.setTimeInMillis(passAlarm.getTime());
            picker.setCurrentHour(passedTime.get(Calendar.HOUR_OF_DAY));
            picker.setCurrentMinute(passedTime.get(Calendar.MINUTE));
            String ampm = (passedTime.get(Calendar.HOUR_OF_DAY) > 12 ? "pm" : "am");
            String message = "Passed Time is: " + (passedTime.get((Calendar.HOUR_OF_DAY)%12)!=0?(passedTime.get(Calendar.HOUR_OF_DAY)%12):12) + ":" + passedTime.get(Calendar.MINUTE) + " " + ampm;
            Toast.makeText(getApplicationContext(), message, Toast.LENGTH_SHORT).show();
        }
        else{
        // Do Nothing
        }

    }

但是当这样通过 PendingIntent 发送时:

private void newAlarm(AlarmClass alarmclass){
        Intent intent = new Intent(getBaseContext(), Alarm.class);
        intent.putExtra("alarm", alarmclass);
        Calendar cal = Calendar.getInstance();
        cal.setTimeInMillis(alarmclass.getTime());
        AlarmsDataSource alarm =  new AlarmsDataSource(this);
        alarm.open();
        AlarmClass alarmObject = new AlarmClass();
        alarmObject = alarm.createAlarm(true, cal.getTimeInMillis(), false, false, false);
        PendingIntent torpedo = PendingIntent.getBroadcast(this,alarmObject.getAlarmNumber(),intent,PendingIntent.FLAG_UPDATE_CURRENT);
        AlarmManager goOff = (AlarmManager) getSystemService(ALARM_SERVICE);
        goOff.set(AlarmManager.RTC_WAKEUP, alarmObject.getTime() ,torpedo);
        Toast.makeText(getApplicationContext(), "Alarm Number " + alarmObject.getAlarmNumber(), Toast.LENGTH_LONG).show();
        alarm.close();
    }

并以同样的方式收到警报 Activity :

public class Boom extends MainActivity{
AlarmClass boomAlarm = new AlarmClass();

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            final Window wake = getWindow();
            wake.addFlags(WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON | WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD);
            setContentView(R.layout.boom);
            setTheme(R.style.AlarmStyle);
            overridePendingTransition(android.R.anim.fade_in,5000);
            boomAlarm = (AlarmClass) getIntent().getParcelableExtra("alarm");
    //      Vibrator buzz = (Vibrator) getSystemService(VIBRATOR_SERVICE);
    //      buzz.vibrate(1000);
            snoozeListener();
            dismissListener();
        }

我传递给 boomAlarm 的可打包对象始终为空。

有谁知道为什么一个 parcelable 对象在 intent 中工作得很好，但在 PendingIntent 的另一边却变成 null？

Answer 1

听起来您遇到的问题类似于 ClassNotFoundException when using custom Parcelable

https://code.google.com/p/android/issues/detail?id=6822 中描述了一种解决方法 并回答ClassNotFoundException when using custom Parcelable