Question

我是Java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简单的东西开始。所以现在我正在写一个闹钟，如果它们在关闭后没有重复，我想更新闹钟。当我将一个可分辨的AlarmClass（我的警报对象）传递给具有意图的警报设置屏幕时，它通过就好了。当我将相同的AlarmClass传递给一个intent，并将它放在Alarm Manager中的PendingIntent中，然后尝试从可以解除警报的屏幕上获取它时，我正在调用的AlarmClass对象以及完全相同的方式填充永远是空的。

这是我的闹钟课：

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];
        }
    };

从这里开始，我可以将我的对象传递给警报设置器，以便更新它：

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

我接受我的时间安排就好了。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();
    }

并以同样的方式接收报警活动：

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的传递的parcelable对象总是为null。

有没有人知道为什么一个parcelable对象在intent中可以正常工作，但是在PendingIntent的另一端出现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描述了一种解决方法并回答ClassNotFoundException when using custom Parcelable

Answer 2

事实证明，ParcelableExtra在广播接收器上掉线了！我确实正在通过它，但是，当广播接收器发射活动时，它没有重新附加附加内容;在尝试getParcelableExtras时，活动中出现null。

Answer 3

编辑：我认为你的问题就在这一行：

PendingIntent torpedo = PendingIntent.getBroadcast(this,alarmObject.getAlarmNumber(),intent,PendingIntent.FLAG_UPDATE_CURRENT);

您没有在此处开始活动，但BroadCast尝试按如下方式更改活动：

PendingIntent torpedo = PendingIntent.getActivity(this,alarmObject.getAlarmNumber(),intent,PendingIntent.FLAG_UPDATE_CURRENT);

将PendingIntent.getBroadcast()更改为PendingIntent.getActivity();

尝试更改以下内容：

Intent intent = new Intent(getBaseContext(), Alarm.class);

到

Intent intent = new Intent(this , Alarm.class);

或

Intent intent = new Intent(getApplicationContext(), Alarm.class);

Answer 4

试

boomAlarm = (AlarmClass) getIntent().getExtras().get("alarm");

而不是

boomAlarm = (AlarmClass) getIntent().getParcelableExtra("alarm");

如果不起作用

使AlarmClass扩展Serializable而不是Parceable。

getParcelableExtra在Pending Intent上始终为null，但不是Intent

4 个答案: