Java Android应用程序帮助

您好，我已经创建了一个任务提醒应用程序。但是，我无法让它用任务名称通知用户任务。这应该是一件相当简单的事情，但我做不到

我想让它做的是：我保存一个名为“任务3”的任务，并在下午6点提醒我。当下午6点到来时，我收到一个通知警报，上面写着“任务3”。目前，它只说“任务需要检查”。有没有办法检索任务标题并将其显示为通知而不是字符串

这是提醒服务类：

公共提醒服务（）{ 超级（“提醒服务”）； }

@Override
void doReminderWork(Intent intent) {
    Log.d("ReminderService", "Doing work.");
    Long rowId = intent.getExtras().getLong(RemindersDbAdapter.KEY_ROWID);

    NotificationManager mgr = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);

    Intent notificationIntent = new Intent(this, ReminderEditActivity.class);                 
    notificationIntent.putExtra(RemindersDbAdapter.KEY_ROWID, rowId); 

    PendingIntent pi = PendingIntent.getActivity(this, 0, notificationIntent, PendingIntent.FLAG_ONE_SHOT); 

//顺便说一下，这是我需要改变的地方

    Notification notification=new Notification(android.R.drawable.stat_sys_warning, getString(R.string.notify_new_task_message), System.currentTimeMillis());
    notification.setLatestEventInfo(this, getString(R.string.notify_new_task_title), getString(R.string.notify_new_task_message), pi);

这是提醒适配器类

* @param reminderDateTime the date and time the reminder should remind the user
 * @return rowId or -1 if failed
 */
public long createReminder(String title, String body, String reminderDateTime) {
    ContentValues initialValues = new ContentValues();
    initialValues.put(KEY_TITLE, title);
    initialValues.put(KEY_BODY, body);
    initialValues.put(KEY_DATE_TIME, reminderDateTime); 

    return mDb.insert(DATABASE_TABLE, null, initialValues);
}

/**
 * Delete the reminder with the given rowId
 * 
 * @param rowId id of reminder to delete
 * @return true if deleted, false otherwise
 */
public boolean deleteReminder(long rowId) {

    return mDb.delete(DATABASE_TABLE, KEY_ROWID + "=" + rowId, null) > 0;
}

/**
 * Return a Cursor over the list of all reminders in the database
 * 
 * @return Cursor over all reminders
 */
public Cursor fetchAllReminders() {

    return mDb.query(DATABASE_TABLE, new String[] {KEY_ROWID, KEY_TITLE,
            KEY_BODY, KEY_DATE_TIME}, null, null, null, null, null);
}

/**
 * Return a Cursor positioned at the reminder that matches the given rowId
 * 
 * @param rowId id of reminder to retrieve
 * @return Cursor positioned to matching reminder, if found
 * @throws SQLException if reminder could not be found/retrieved
 */
public Cursor fetchReminder(long rowId) throws SQLException {

    Cursor mCursor =

            mDb.query(true, DATABASE_TABLE, new String[] {KEY_ROWID,
                    KEY_TITLE, KEY_BODY, KEY_DATE_TIME}, KEY_ROWID + "=" + rowId, null,
                    null, null, null, null);
    if (mCursor != null) {
        mCursor.moveToFirst();
    }
    return mCursor;

}

/**
 * Update the reminder using the details provided. The reminder to be updated is
 * specified using the rowId, and it is altered to use the title, body and reminder date time
 * values passed in
 * 
 * @param rowId id of reminder to update
 * @param title value to set reminder title to
 * @param body value to set reminder body to
 * @param reminderDateTime value to set the reminder time. 
 * @return true if the reminder was successfully updated, false otherwise
 */
public boolean updateReminder(long rowId, String title, String body, String reminderDateTime) {
    ContentValues args = new ContentValues();
    args.put(KEY_TITLE, title);
    args.put(KEY_BODY, body);
    args.put(KEY_DATE_TIME, reminderDateTime);

    return mDb.update(DATABASE_TABLE, args, KEY_ROWID + "=" + rowId, null) > 0;
}

---

}

如果我理解正确，问题是您显示的字符串是string.xml中定义的常量字符串。您应该使用从Intent获取的行id从数据库中获取相应的提醒并显示其标题

@Override
void doReminderWork(Intent intent) {
    Log.d("ReminderService", "Doing work.");
    Long rowId = intent.getExtras().getLong(RemindersDbAdapter.KEY_ROWID);

    NotificationManager mgr = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);

    Intent notificationIntent = new Intent(this, ReminderEditActivity.class);                 
    notificationIntent.putExtra(RemindersDbAdapter.KEY_ROWID, rowId); 

    PendingIntent pi = PendingIntent.getActivity(this, 0, notificationIntent, PendingIntent.FLAG_ONE_SHOT); 

当您在提供行id的同时从fetchReminder方法检索光标后，您可以使用以下方法获取提醒的标题：

String reminderTitle = cursor.getString(cursor.getColumnIndex(RemindersDbAdapter.KEY_TITLE));

---

事先确认光标不为空。

HI这是正确的。我试过使用行id，但由于某些原因，它不会显示标题，只显示“id”一词。嗨，谢谢。字符串rementerTitle=cursor.getString（cursor.getColumnIndex（rementersDBAdapter.KEY_TITLE））；进入fetchreminder方法内部？否，在生成通知时，必须以行id作为参数调用ReminderBadapterFetchReminder方法。它将在相应的数据库记录上返回一个游标，然后您可以使用我给您的代码行gwt标题。