将日历参数与Android时间参数进行比较时指针

Question

我遇到的问题是我试图接收用户输入，以比较用户输入和通过提交按钮和datepicker，timepicker和numberspick提交的计划日期和时间（用于秒）。

当用户按下提交时，该信息然后将其设置为日历对象，并且该应用程序始终通过ioiolooper循环以检查是否应调用事件（例如，引脚打开以打开灯光）。。

需要任何问题，疑虑或澄清，请随时告诉我。

*编辑：此外，该应用程序立即崩溃并产生logcat中的空指针错误。

谢谢伙计;

主要活动此活动是程序的主要活动，当应用程序启动时运行，它是与IOIO板接口的IOiOioActivity的扩展：

    now = new Time();
    eventCalendar = eventCalendar.getInstance();
    eventCalendar.set(0,0,0,0,0,0);
    submitEvent = (Button) findViewById(R.id.submit);

    // Wakelock
    PowerManager powerManageDevice = (PowerManager) getSystemService(Context.POWER_SERVICE);
    wakeLockDevice = powerManageDevice.newWakeLock(
            PowerManager.FULL_WAKE_LOCK, "Wakelocking the Scheduler");
    super.onCreate(savedInstanceState);
    wakeLockDevice.acquire();
    setContentView(R.layout.activity_main);
    chooseDay = (DatePicker) findViewById(R.id.datepicker1);
    chooseTime = (TimePicker) findViewById(R.id.timepicker1);
    togglePin = (ToggleButton) findViewById(R.id.ledtoggle);
    chosePin1 = (NumberPicker) findViewById(R.id.pinpick1);
    chosePin1.setMaxValue(46);
    chosePin1.setMinValue(1);
    chosePin2 = (NumberPicker) findViewById(R.id.pinpick2);
    chosePin2.setMaxValue(46);
    chosePin2.setMinValue(1);
    chosePin3 = (NumberPicker) findViewById(R.id.pinpick3);
    chosePin3.setMaxValue(46);
    chosePin3.setMinValue(1);
    chosePin4 = (NumberPicker) findViewById(R.id.pinpick4);
    chosePin4.setMaxValue(46);
    chosePin4.setMinValue(1);
    chosePin5 = (NumberPicker) findViewById(R.id.pinpick5);
    chosePin5.setMaxValue(46);
    chosePin5.setMinValue(1);
    chosePin6 = (NumberPicker) findViewById(R.id.pinpick6);
    chosePin6.setMaxValue(46);
    chosePin6.setMinValue(1);
    chosePin7 = (NumberPicker) findViewById(R.id.pinpick7);
    chosePin7.setMaxValue(46);
    chosePin7.setMinValue(1);
    chosePin8 = (NumberPicker) findViewById(R.id.pinpick8);
    chosePin8.setMaxValue(46);
    chosePin8.setMinValue(1);
    chosePin9 = (NumberPicker) findViewById(R.id.pinpick9);
    chosePin9.setMaxValue(46);
    chosePin9.setMinValue(1);
    secondPicker = (NumberPicker) findViewById(R.id.secondPicker);
    secondPicker.setMaxValue(59);
    secondPicker.setMinValue(0);
    submitEvent.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            eventCalendar.set(chooseDay.getYear(), chooseDay.getMonth(), chooseDay.getDayOfMonth(), chooseTime.getCurrentHour(), chooseTime.getCurrentMinute(), secondPicker.getValue());
        }
    });

内部类：

class Looper extends BaseIOIOLooper {
    /** The on-board LED. */
    private DigitalOutput led_;
    private DigitalOutput pin1PWM;
    private DigitalOutput pin2PWM;
    private DigitalOutput pin3PWM;
    private DigitalOutput pin4PWM;
    private DigitalOutput pin5PWM;
    private DigitalOutput pin6PWM;
    private DigitalOutput pin7PWM;
    private DigitalOutput pin10PWM;
    private DigitalOutput pin11PWM;
    private DigitalOutput pin12PWM;
    private DigitalOutput pin13PWM;
    private DigitalOutput pin14PWM;
    private DigitalOutput pin27PWM;
    private DigitalOutput pin28PWM;
    private DigitalOutput pin34PWM;
    private DigitalOutput pin35PWM;
    private DigitalOutput pin36PWM;
    private DigitalOutput pin37PWM;
    private DigitalOutput pin38PWM;
    private DigitalOutput pin39PWM;
    private DigitalOutput pin40PWM;
    /**
     * private DigitalOutput pin1; private DigitalOutput pin2; private
     * DigitalOutput pin3; private DigitalOutput pin4; private DigitalOutput
     * pin5; private DigitalOutput pin6; private DigitalOutput pin7;
     */
    private DigitalOutput pin8;
    private DigitalOutput pin9;
    /**
     * private DigitalOutput pin10; private DigitalOutput pin11; private
     * DigitalOutput pin12; private DigitalOutput pin13; private
     * DigitalOutput pin14;
     */
    private DigitalOutput pin15;
    private DigitalOutput pin16;
    private DigitalOutput pin17;
    private DigitalOutput pin18;
    private DigitalOutput pin19;
    private DigitalOutput pin20;
    private DigitalOutput pin21;
    private DigitalOutput pin22;
    private DigitalOutput pin23;
    private DigitalOutput pin24;
    private DigitalOutput pin25;
    private DigitalOutput pin26;
    // private DigitalOutput pin27;
    // private DigitalOutput pin28;
    private DigitalOutput pin29;
    private DigitalOutput pin30;
    private DigitalOutput pin31;
    private DigitalOutput pin32;
    private DigitalOutput pin33;
    /**
     * private DigitalOutput pin34; private DigitalOutput pin35; private
     * DigitalOutput pin36; private DigitalOutput pin37; private
     * DigitalOutput pin38; private DigitalOutput pin39; private
     * DigitalOutput pin40;
     */
    private DigitalOutput pin41;
    private DigitalOutput pin42;
    private DigitalOutput pin43;
    private DigitalOutput pin44;
    private DigitalOutput pin45;
    private DigitalOutput pin46;

    private DigitalOutput[] pinDigArray = { pin1PWM, pin2PWM, pin3PWM,
            pin4PWM, pin5PWM, pin6PWM, pin7PWM, pin8, pin9, pin10PWM,
            pin11PWM, pin12PWM, pin13PWM, pin14PWM, pin15, pin16, pin17,
            pin18, pin19, pin20, pin21, pin22, pin23, pin24, pin25, pin26,
            pin27PWM, pin28PWM, pin29, pin30, pin31, pin32, pin33,
            pin34PWM, pin35PWM, pin36PWM, pin37PWM, pin38PWM, pin39PWM,
            pin40PWM, pin41, pin42, pin43, pin44, pin45, pin46 };
    /**
     * Called every time a connection with IOIO has been established.
     * Typically used to open pins.
     * 
     * @throws ConnectionLostException
     *             When IOIO connection is lost.
     * 
     * @see ioio.lib.util.AbstractIOIOActivity.IOIOThread#setup()
     */
    @Override
    protected void setup() throws ConnectionLostException {
        led_ = ioio_.openDigitalOutput(0, true);
        for (int i = 0; i < pinDigArray.length; i++) {
            pinDigArray[i] = ioio_.openDigitalOutput(i + 1, false);
        }
    }
    /**
     * Called repetitively while the IOIO is connected.
     * 
     * @throws ConnectionLostException
     *             When IOIO connection is lost.
     * 
     * @see ioio.lib.util.AbstractIOIOActivity.IOIOThread#loop()
     */
    @Override
    public void loop() throws ConnectionLostException {
        now.setToNow();

        led_.write(!togglePin.isChecked());
        try {
            Thread.sleep(100);
        } catch (InterruptedException e) {
        }
        for (int i = 0; i < pinDigArray.length; i++) {
            if (chosePin1.getValue() == i + 1) {
                if(now.monthDay == eventCalendar.DAY_OF_MONTH)
                pinDigArray[i].write(true);
            } else {
                pinDigArray[i].write(false);
            }
        }
    }
}
/**
 * A method to create our IOIO thread.
 * 
 * @see ioio.lib.util.AbstractIOIOActivity#createIOIOThread()
 */
@Override
protected IOIOLooper createIOIOLooper() {
    return new Looper();
}

尝试对此进行编辑：

public void loop() throws ConnectionLostException {
        now.setToNow();
        led_.write(!togglePin.isChecked());
        try {
            Thread.sleep(100);
        } catch (InterruptedException e) {
        }
        for (int i = 0; i < pinDigArray.length; i++) {
            if (chosePin1.getValue() == i + 1) {
                if(now.compare(now, eventTime) == 0)
                pinDigArray[i].write(true);
            } else {
                pinDigArray[i].write(false);
            }
        }

我将日历更改为另一个计时器对象，并试图仅比较两个值。我将EventTime对象实例化为所有0。

*第三次编辑：我还完全删除了条件语句，但它仍然崩溃；我认为循环/检查语句不是在这里引起问题的原因。

我得到一个：java运行时异常：无法启动活动componentInfo

解决了：

我只需要在此处删除所有零的实例化：EventCalendar.Set（0,0,0,0,0,0）;

也time.compare（现在，eventtime）== 0是更好的比较。

Answer 1

if（现在。

eventcalendar.day_of_month将始终等于5，因为它是一个常数。您想这样做：if（现在。