java - 在 Android 中取消警报管理器

Question

我在尝试取消 Android 中的 AlarmManager 时遇到了一些问题。我调用这个 retrieveBudget() onCreate:

public void retrieveBudget() {
    txtDisplayMonthlyExpenses = (TextView) findViewById(R.id.txtDisplayMonthlyExpense);
    txtDisplayBudget = (TextView) findViewById(R.id.txtDisplayBudget);
    cbDisplayReminderNotify = (CheckBox) findViewById(R.id.cbDisplayReminderNotify);
    cbDisplayReminderNotify.setEnabled(false);

    DatabaseAdapter mDbHelper = new DatabaseAdapter(this);
    mDbHelper.createDatabase();
    mDbHelper.open();
    TransactionRecController trc = new TransactionRecController(
            mDbHelper.open());
    currentMonthExpense = trc.getThisMonthDebit();
    txtDisplayMonthlyExpenses.setText("$ "
            + formatter.format(currentMonthExpense));

    BudgetController bc = new BudgetController(mDbHelper.open());

    BudgetModel bm = bc.getBudget();
    if (bm.getBudgetAmount() != 0 && bm.getReminderNotify() != null) {
        budget = bm.getBudgetAmount();
        txtDisplayBudget.setText("$ " + formatter.format(budget));
        if (bm.getReminderNotify().equals("Y")) {
            cbDisplayReminderNotify.setChecked(true);
        } else {
            cbDisplayReminderNotify.setChecked(false);
        }
        AlarmManager mgr = (AlarmManager) context
                .getSystemService(Context.ALARM_SERVICE);
        PendingIntent pi = null;
        if (bm.getReminderNotify().equals("Y")
                && currentMonthExpense > budget) {
            Calendar calendar = Calendar.getInstance();
            calendar.setTimeInMillis(System.currentTimeMillis());
            calendar.set(Calendar.HOUR_OF_DAY, 0);
            calendar.set(Calendar.MINUTE, 1);
            notificationCount = notificationCount + 1;

            Intent notificationIntent = new Intent(context,
                    BudgetAlarm.class);
            notificationIntent.putExtra("NotifyCount", notificationCount);
            pi = PendingIntent.getBroadcast(context, notificationCount,
                    notificationIntent, PendingIntent.FLAG_UPDATE_CURRENT);
            mgr.setInexactRepeating(AlarmManager.RTC_WAKEUP,
                    calendar.getTimeInMillis(), 60000, pi);
        } else {
            mgr.cancel(pi);
        }
    } else {
        txtDisplayBudget.setText("No budget record yet");
    }

    mDbHelper.close();
}

在我的 budgetAlarm 类中，它只是简单地设置通知。所以我的问题是它确实每分钟执行一次通知。但是在我将我的 reminderNotify 更改为“N”而不是“Y”之后，它并没有取消警报管理器。我想知道为什么会这样，因为在更新 SQL 语句之后，我再次调用此 retrieveBudget()。

提前致谢。

编辑

这些是我更新预算部分的代码。当单击 Okay from 对话框时，我再次调用 retrieveBudget()。

public void onEditBudgetClicked(View view) {
    AlertDialog.Builder EditDialog = new AlertDialog.Builder(this);
    EditDialog.setTitle("Edit Budget");

    // Get the components from XML file
    LayoutInflater li = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    View dialogView = li.inflate(R.layout.edit_budget, null);
    txtEditBudgetAmount = (EditText) dialogView
            .findViewById(R.id.txtEditBudgetAmount);
    cbEditReminderNotify = (CheckBox) dialogView
            .findViewById(R.id.cbEditReminderNotify);

    // Retrieve budget record
    DatabaseAdapter mDbHelper = new DatabaseAdapter(this);
    mDbHelper.createDatabase();
    mDbHelper.open();
    BudgetController bc = new BudgetController(mDbHelper.open());
    BudgetModel bm = bc.getBudget();
    if (bm.getBudgetAmount() != 0 && bm.getReminderNotify() != null) {
        txtEditBudgetAmount.setText(Float.toString(bm.getBudgetAmount()));
        if (bm.getReminderNotify().equals("Y")) {
            cbEditReminderNotify.setChecked(true);
            editReminderNotify = "Y";
        } else {
            cbEditReminderNotify.setChecked(false);
        }
    }
    mDbHelper.close();

    cbEditReminderNotify.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            if (cbEditReminderNotify.isChecked()) {
                editReminderNotify = "Y";
            } else {
                editReminderNotify = "N";
            }
        }
    });

    EditDialog.setView(dialogView);
    EditDialog.setPositiveButton("Ok",
            new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int whichButton) {
                    onEditBudgetSubmitClicked();
                    dialog.dismiss();
                    retrieveBudget();
                }
            });

    EditDialog.setNegativeButton("Cancel",
            new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int whichButton) {
                    dialog.dismiss();
                }
            });
    EditDialog.show();
}

Answer 1

在警报管理器的创建和取消时初始化未决 Intent 时使用的通知计数值应该相同。

在未决 Intent 中使用相同的 requestFalg 值。

替换这部分:

AlarmManager mgr = (AlarmManager) context
            .getSystemService(Context.ALARM_SERVICE);
PendingIntent pi = null;
if (bm.getReminderNotify().equals("Y")
           && currentMonthExpense > budget) {
    Calendar calendar = Calendar.getInstance();
    calendar.setTimeInMillis(System.currentTimeMillis());
    calendar.set(Calendar.HOUR_OF_DAY, 0);
    calendar.set(Calendar.MINUTE, 1);
    notificationCount = notificationCount + 1;
    Intent notificationIntent = new Intent(context,
                BudgetAlarm.class);
    notificationIntent.putExtra("NotifyCount", notificationCount);
    pi = PendingIntent.getBroadcast(context, notificationCount,
                notificationIntent, PendingIntent.FLAG_UPDATE_CURRENT);
    mgr.setInexactRepeating(AlarmManager.RTC_WAKEUP,
                calendar.getTimeInMillis(), 60000, pi);
    } else {
        mgr.cancel(pi);
    }

与

AlarmManager mgr = (AlarmManager) context
            .getSystemService(Context.ALARM_SERVICE);
Intent notificationIntent = new Intent(context,
                BudgetAlarm.class);
PendingIntent pi = null;
if (bm.getReminderNotify().equals("Y")
            && currentMonthExpense > budget) {
    Calendar calendar = Calendar.getInstance();
    calendar.setTimeInMillis(System.currentTimeMillis());
    calendar.set(Calendar.HOUR_OF_DAY, 0);
    calendar.set(Calendar.MINUTE, 1);
    notificationCount = notificationCount + 1;
    notificationIntent.putExtra("NotifyCount", notificationCount);
    pi= PendingIntent.getBroadcast(context, 1,
                notificationIntent, PendingIntent.FLAG_UPDATE_CURRENT);
    mgr.setInexactRepeating(AlarmManager.RTC_WAKEUP,
                calendar.getTimeInMillis(), 60000, pi);
    } else {
        pi= PendingIntent.getBroadcast(context, 1,
                notificationIntent, PendingIntent.FLAG_UPDATE_CURRENT);
        mgr.cancel(pi);
    }

如果您在启动警报后初始化未决 Intent 时更改了 requestFlag 的值(在您的情况下为 notificationcount)，您将无法取消它。

在创建和取消警报时在未决 Intent 中使用相同的 requestFlag 值。在这里，我使用 1。

由于您是在启动警报管理器后更改 notificationFlag 的值，因此不要将 notificationFlag 用作 requestFlag。在 if 和 else 部分中初始化 pi 时，使用常量整数值作为 requestFlag。

pi= PendingIntent.getBroadcast(context, CONSTANT_INTEGER,notificationIntent, PendingIntent.FLAG_UPDATE_CURRENT);

检查下面的链接:

PendingIntent getBroadcast (Context context, int requestCode, Intent Intent , int flags)

http://developer.android.com/reference/android/app/PendingIntent.html#getBroadcast%28android.content.Context,%20int,%20android.content.Intent,%20int%29