Question

我想从eventreminder创建一个事件提醒提醒。但为什么警报没有显示？

我在清单中有android.permission.SYSTEM_ALERT_WINDOW。

这是eventreminder服务的代码：

package com.example.android.eventreminder;

import android.app.AlertDialog;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Intent;
import android.database.Cursor;
import android.util.Log;
import android.view.WindowManager;

/* This class is responsible for notification when an alarm and proximity alert are fired
 * Sets up pending intent which is used by notification system. 
 * Pending intent contains intent to start ViewReminder Activity when notification is clicked*/
public class EventReminderService extends WakeReminderIntentService {
    private eventDB mDbHelper;
    private String notificationTitle;

    public EventReminderService() {
        super("EventReminderService");
    }

    @Override
    void doReminderWork(Intent intent) {
        /* Status bar notification */
        /* when the notification is selected from status bar,
         * ViewReminder activity will be started using rowId as part of 
         * pending intent. ViewReminder activity will be used to display
         * event data, to delete event and to snooze time-based event*/
        AlertDialog d = new AlertDialog.Builder(this)
                .setTitle("tanchulai")
                .setMessage("bucuo de tanchulai")

                .create();

        d.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);
        d.show();


        Long rowId = intent.getExtras().getLong(eventDB.KEY_ROWID);

        NotificationManager mgr = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);

        /* Add reminder activity will started when notification is selected */
        Intent notificationIntent = new Intent(this, ViewReminder.class); 
        notificationIntent.putExtra(eventDB.KEY_ROWID, rowId); 

        int rowID = rowId.intValue();
        /* set pending intent */
        PendingIntent pi = PendingIntent.getActivity(this, rowID, notificationIntent,
        PendingIntent.FLAG_ONE_SHOT);
        Log.d("TAG", "PI in ERSer for: "+rowID);
        /* set notification for status bar */
        Notification note=new Notification(android.R.drawable.stat_sys_warning,
                                        getString(R.string.notify_new_task_message),
                                        System.currentTimeMillis());


        mDbHelper = new eventDB(this);
        mDbHelper.open();
        Cursor notificationData = mDbHelper.fetchEvent(rowId); 
        /* get title of the event*/
        notificationTitle = notificationData.getString(
                notificationData.getColumnIndexOrThrow(eventDB.KEY_TITLE)); 

        note.setLatestEventInfo(this, notificationTitle,
                                getString(R.string.notify_new_task_message), pi); 

        notificationData.close();
        mDbHelper.close();

        /* Set default notification sound */
        note.defaults |= Notification.DEFAULT_SOUND; 
        /* Cancel notification after selection by user */
        note.flags |= Notification.FLAG_AUTO_CANCEL; 

        int id = (int)((long)rowId); 
        /* produce notification on status bar */
        mgr.notify(id, note);

    }
}

Answer 1

服务与Activity分开运行（以便在后台运行）。因此，服务没有窗口，您无法显示对话框或烤面包。您应该将数据发送到活动，并在那里处理。

您可以使用BroadcastReceiver将数据从Activity发送到Service。

我想提醒服务

1 个答案: