Question

我想做的是，通知用户有关即将完成的任务的通知，该任务已添加到待办事项列表EVEN而无需打开待办事项应用程序。我顺便使用了BroadcastReceiver，因为我已经阅读了android检查它们，看看是否有任何消息已被他们收到。我知道有些东西不见了因为我已经把所有东西都放在了mainactivity.java中，所以只需打开应用即可。

这是我的BroadcastReceiver文件 public class Broadcast扩展BroadcastReceiver {

@Override
public void onReceive(Context context, Intent intent) {
    // TODO Auto-generated method stub

    try {
        Bundle bundle = intent.getExtras();
        String message = bundle.getString("alarm_message");
        Toast.makeText(context, message, Toast.LENGTH_SHORT).show();
    } catch (Exception e) {
        Toast.makeText(
                context,
                "There was an error somewhere, but we still received an alarm",
                Toast.LENGTH_SHORT).show();
        e.printStackTrace();

    }

    Toast.makeText(context, "received an alarm", Toast.LENGTH_SHORT).show();

}

}

这是我的mainactivity.java

公共类MainActivity扩展了Activity {

public NotificationCompat.Builder builder;
public NotificationManager notificationManager;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    // NOTIFICATION

    AlarmManager alarmMang = (AlarmManager) getSystemService(ALARM_SERVICE);

    // ---get current date and time---

    Calendar calender = Calendar.getInstance();
    calender.add(Calendar.MINUTE, 5);


    Intent noteIntent = new Intent(this, Broadcast.class);
    PendingIntent pendI = PendingIntent.getActivity(this, 0, noteIntent, 0);
    long fireTime = System.currentTimeMillis();

    builder = new NotificationCompat.Builder(this)
            .setSmallIcon(R.drawable.ic_launcher)
            .setContentTitle("Notifications Example")
            .setContentText("This is a test notification");

    notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);

    // // BUTTON NOT
    Button b = (Button) findViewById(R.id.button1);
    b.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View arg0) {
            // TODO Auto-generated method stub
            notificationManager.notify(0, builder.build());
        }
    });

    // // AET ALARM



    Toast.makeText(this, "lilili", Toast.LENGTH_SHORT).show();
    alarmMang.set(AlarmManager.RTC_WAKEUP, calender.getTimeInMillis(),
            pendI);


    notificationManager.notify(2332323, builder.build());
    // finish();

}

Answer 1

注意：显示基本通知相对简单，此示例代码可以帮助您了解其工作原理

// Notification.Builder is used to create the notification
Notification.Builder builder = new Notification.Builder(this);
// This set the title of the notification
builder.setContentTitle("Title")
// This set the content of the notification (the text inside the notification)
.setContentText("Content of the notification")
// Here you set the icon of the notification
.setSmallIcon(R.drawable.ic_action_copy);

// Build the notification and save it
Notification notification = builder.build();
// To show the notification you need to use the NotificationManager, to get it you should use getSystemService
NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
// .. then you can use .notify to show the notification
// 0 is the ID of the notification, you can use this ID to update the notification later.
// notification is the notification to show (you can use builder.build() inside too.)
manager.notify(0, notification);

但是如果您需要有关通知的更多信息，应该阅读this，这是一个非常好的教程，并且还可以解释图像的所有内容。

在android中添加To-do列表的通知？

1 个答案: