[英]Intent .putExtra return null with PendingIntent
此应用程序允许我启动一项服务来提醒我饮酒。 如果我单击通知,我想查看服务是否正在运行,但是使用Intent.putExtra方法没有任何输出。
我的MainActivity类:
Boolean isServiceRunning = false;
AlarmManager alarmManager;
PendingIntent pendingIntent;
TextView mainText;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mainText = findViewById(R.id.mainTextView);
Bundle extras = getIntent().getExtras();
if (extras == null) {
mainText.setText("Service is paused");
} else {
mainText.setText("Service is running");
}
}
public void sendNotification(View view) {
if (!isServiceRunning) {
isServiceRunning = true;
Toast.makeText(this, "Reminder service started.", Toast.LENGTH_SHORT).show();
alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
mainText.setText("Service is running.");
Intent i = new Intent(this, reciever.class);
i.putExtra("isServiceRunning", isServiceRunning.booleanValue());
pendingIntent = PendingIntent.getBroadcast(this, 100, i, PendingIntent.FLAG_UPDATE_CURRENT);
Calendar calendar = Calendar.getInstance();
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), 1000 * 60 * 10, pendingIntent);
} else {
isServiceRunning = false;
Toast.makeText(this, "Reminder service ended.", Toast.LENGTH_SHORT).show();
mainText.setText("Service paused.");
alarmManager.cancel(pendingIntent);
}
}
我认为可以使用sharedpreferences解决此问题,但这不是一个好的解决方案。
编辑:
我的广播接收器课程:
public class reciever BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
Intent notificationIntent = new Intent(context, drinkReminder.class);
TaskStackBuilder stackBuilder = TaskStackBuilder.create(context);
stackBuilder.addParentStack(drinkReminder.class);
stackBuilder.addNextIntent(notificationIntent);
PendingIntent pendingIntent = stackBuilder.getPendingIntent(100, PendingIntent.FLAG_UPDATE_CURRENT);
NotificationManagerCompat notificationManager = NotificationManagerCompat.from(context);
Notification notification = new NotificationCompat.Builder(context, CHANNEL_1_ID)
.setContentTitle("Title")
.setContentText("description")
.setSmallIcon(R.drawable.icon_waterdrop)
.setTimeoutAfter(30000)
.setContentIntent(pendingIntent)
.setAutoCancel(true)
.build();
notificationManager.notify(0, notification);
}
}
代替onCreate()和putExtra()中的代码,您可以在每种情况下创建两个挂起的意图,每个意图使用不同的广播接收器。 在该广播接收器中,您可以打印单独的Toast消息。
MyBroadcastRecieverStart.java
public class MyBroadcastReceiverStart extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
Toast.makeText(this, "Reminder service started.", Toast.LENGTH_SHORT).show();
}
}
MyBroadcastReceiverStop.java
public class MyBroadcastReceiverStop extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
Toast.makeText(this, "Reminder service ended.", Toast.LENGTH_SHORT).show();
}
}
SendNotification方法-
public void sendNotification(View view) {
if (!isServiceRunning) {
isServiceRunning = true;
alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
mainText.setText("Service is running.");
Intent i = new Intent(this, MyBroadcastReceiverStart.class);
pendingIntent = PendingIntent.getBroadcast(this, 100, i, PendingIntent.FLAG_UPDATE_CURRENT);
Calendar calendar = Calendar.getInstance();
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), 1000 * 60 * 10, pendingIntent);
} else {
isServiceRunning = false;
mainText.setText("Service paused.");
Intent i = new Intent(this, MyBroadcastReceiverStop.class);
pendingIntent = PendingIntent.getBroadcast(this, 100, i, PendingIntent.FLAG_UPDATE_CURRENT);
Calendar calendar = Calendar.getInstance();
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), 1000 * 60 * 10, pendingIntent);
alarmManager.cancel(pendingIntent);
}
}
如果您在else块中编写alarmManager.cancel(pendingIntent),它将取消一个不存在的意图,因为您已经在if块中创建了该意图,并且如果else被执行则不会创建该意图,因此我在else中创建了该意图挡也。
您正在将“额外”添加到传递给AlarmManager
的Intent
中。 这个“额外”将存在于intent中,该onReceive()
在onReceive()
传递给您的BroadcastReceiver
,但您在那里没有对其进行任何操作。
当您单击Notification
,它将启动drinkReminder
,我希望它是一个Activity
。
您还在评论中说:
你能告诉我一件事吗? 有时,如果我按下按钮启动服务,则大约10秒钟后会出现一条通知,在此之后,它会显示所有10分钟。 我怎样才能解决这个问题?
这是您设置警报的代码:
Calendar calendar = Calendar.getInstance();
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP,
calendar.getTimeInMillis(), 1000 * 60 * 10, pendingIntent);
调用setRepeating()
,第二个参数指定警报第一次响起,第三个参数指定重复间隔。 您已告知警报管理器,您希望第一个警报立即触发,然后在之后每10分钟触发一次。
如果要在按下按钮10分钟后触发第一个警报,则需要调整第二个参数,使其代表未来10分钟的时间,如下所示:
Calendar calendar = Calendar.getInstance();
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP,
calendar.getTimeInMillis() + (1000 * 60 * 10), 1000 * 60 * 10, pendingIntent);
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