通知中的字符串未更新

Question

应用程序应该做的是从editReminder中获取一个字符串，并使用intent将其发送到AlarmManager。这是第一次成功。但是，当你关闭应用程序并重试时，通知不会使用你刚刚在编辑文本中键入的字符串，而是使用你第一次运行应用程序时键入的文本。

我们如何使新插入的文本显示在通知中，而不是旧文本？

MainActive：在按钮单击上执行的方法

public void setAlarm(View v) {
    //get user input
    EditText editText = (EditText) findViewById(R.id.editReminder);
    String reminder = editText.getText().toString();
    String snoozeString = getString(R.string.snooze_result);


    //the AlarmManager
    AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
    //get date and time
    Calendar c = Calendar.getInstance();

    //sets time for alarm
    c.set(Calendar.YEAR, year);
    c.set(Calendar.MONTH, month);
    c.set(Calendar.DAY_OF_MONTH, day);
    c.set(Calendar.HOUR_OF_DAY, hour);
    c.set(Calendar.MINUTE, minute);
    c.set(Calendar.SECOND, 0);

    //pIntent to launch activity when alarm triggers
    Intent intent = new Intent("com.garden.DisplayNotification"); //(1)From here to DisplayNotification ...
    //DisplayNotification is the activity that is intended to be evoked
    //sometimes you have to use (this,DisplayNotification.class)?
    //when the alarm is triggered

    //assign an ID of 1, and add the text
    intent.putExtra("NotifID", 1);
    intent.putExtra("notification", reminder); //("STRING_I_NEED",strname)
    intent.putExtra("notifyAction", snoozeString); //string for the action button
    //set the flags so the mainactivity isn't started when the notification is triggered
    intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);


    PendingIntent displayIntent = PendingIntent.getActivity(
            getBaseContext(), 0,
            intent, 0); //this intent instead of new Intent("com.garden.Reminder")


    //sets alarm
    alarmManager.set(AlarmManager.RTC_WAKEUP,
            c.getTimeInMillis(), displayIntent);

    showConfirmDialog(v);

}

DisplayNotification：在触发通知警报时执行

package com.garden.gardenapp;

import android.app.Activity;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Intent;
import android.os.Bundle;

public class DisplayNotification extends Activity {
/**
 * This activity is to display a notification only. It is called when
 * the system alarm goes off.
 */

//called when activity is first created
//don't forget to update the manifest!!
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);


    //get notification ID passed by MainActivity
    int notifID = getIntent().getExtras().getInt("NotifID");
    //----Oh of course, have to pass on the strings again.....-----
    //initialize strings (reminder is also used for notification text
    String reminderText = getIntent().getStringExtra("notification");
    String snoozeString = getIntent().getStringExtra("notifyAction");


    //pIntent to launch activity if user selects notification
    /** making a new Intent has to be done with (this, Reminder.class) instead
     * of ("com.garden.Reminder")... why? (otherwise the reminder text is not shown)
     */
    Intent reminderIntent = new Intent(this, Reminder.class); //(2)... and from here to Reminder ...
    reminderIntent.putExtra("NotifID", notifID);
    //pass on strings again in the intent
    reminderIntent.putExtra("notification", reminderText);
    //intent.putExtra("notifyAction",snoozeString); //---> in different intent


    PendingIntent reminderPIntent = PendingIntent
            .getActivity(this, 0, reminderIntent, 0);

    Intent actionIntent = new Intent(this, Reminder.class);
    actionIntent.putExtra("notifyAction", snoozeString); //("STRING_I_NEED", strName)
    //don't forget to pass the notifID also to the second intent
    actionIntent.putExtra("NotifID",notifID);
    PendingIntent actionPIntent = PendingIntent.getActivity(this,
            (int) System.currentTimeMillis(), actionIntent, 0);


    //create notification
    Notification notif = new Notification.Builder(this) //build the notification
            .setContentTitle(getString(R.string.app_name)) //required
            .setContentText(reminderText) //required
            .setSmallIcon(R.drawable.garden) //required
            .setContentIntent(reminderPIntent)
            //associate pendingIntent with a gesture of NotificationCompat.Builder: click
            .addAction(R.drawable.pixel, "Snooze me", actionPIntent)
            //should be addAction(NotificationCompat.Action action)
            .setAutoCancel(true) //to be dismissed in the Reminder activity
            .setPriority(Notification.PRIORITY_MAX) //to show the action buttons by default
            // .setVibrate(new long[] {200, 600, 200, 600})
            .build();

    NotificationManager nm = (NotificationManager)
            getSystemService(NOTIFICATION_SERVICE);

    nm.notify(notifID, notif); //(int id, Notification notification);

    finish(); //because this doesn't have a GUI we don't need it anymore

}
}

（在DisplayNotification类中，我们将字符串分为两个意图，因此当您单击snooze（通知操作）按钮时，它触发的意图与单击通知时不同）

我们认为这与警报管理器没有更新带有意图或其他内容的字符串有关。因为当我们在没有警报管理器的情况下发出通知时，应用程序运行良好。如果您需要额外的代码，请告诉我。

Answer 1

我们找到了！您不需要取消报警管理器，但需要给意图一个标志flag\u UPDATE\u CURRENT，让报警管理器用您在意图中输入的新字符串更新意图。因此，在这种情况下，PendingIntent displayIntent变为

 PendingIntent displayIntent = PendingIntent.getActivity(
            getBaseContext(), 0,
            intent, PendingIntent.FLAG_UPDATE_CURRENT);

这就解决了更新字符串的问题。