android - 通知中的字符串未更新

Question

应用程序应该做的是从 editReminder EditText 中获取一个字符串，然后使用一个 intent 将它发送到 AlarmManager。这么好用，第一次。但是当您关闭应用程序并再次尝试时，通知不会使用您刚刚在 EditText 中输入的字符串，而是使用您第一次运行该应用程序时输入的文本。

我们如何让新插入的文本而不是旧文本出现在通知中？

MainActivity:按钮点击时执行的方法

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:当通知的警报触发时执行

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，我们将字符串分成两个 Intent ，因此当您单击暂停(通知操作)按钮时，它会触发与您单击通知时不同的 Intent )

我们认为这与 AlarmManager 没有更新 Intent 附带的字符串有关。因为当我们在没有 AlarmManager 的情况下发出通知时，应用程序运行得非常好。如果您需要其他代码，请告诉我。

Answer 1

我们找到了!你不需要取消警报管理器，但你需要给 Intent 一个标志 FLAG_UPDATE_CURRENT让警报管理器使用您放入 Intent 中的新字符串更新 Intent 。所以在这种情况下，PendingIntent displayIntent 变成了

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

这就解决了更新字符串的问题。