java - 如果应用程序已打开其他活动,则通知在后台不起作用
问题描述
抱歉,我是 Android 工作室的新手,但我需要了解如何制作此通知以保存以及如何使其每天循环
我添加了处理所有通知操作的 4 个 java 活动,当通知将发送到 xml 时,我还添加了文本,但是在我关闭应用程序或打开其他活动后它消失了
package com.example.moksleiviopinigai;
import android.annotation.TargetApi;
import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.content.Context;
import android.content.ContextWrapper;
import android.os.Build;
import androidx.core.app.NotificationCompat;
public class NotificationHelper extends ContextWrapper {
public static final String channelID = "channelID";
public static final String channelName = "Channel Name";
private NotificationManager mManager;
public NotificationHelper(Context base) {
super(base);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
createChannel();
}
}
@TargetApi(Build.VERSION_CODES.O)
private void createChannel() {
NotificationChannel channel = new NotificationChannel(channelID, channelName, NotificationManager.IMPORTANCE_HIGH);
getManager().createNotificationChannel(channel);
}
public NotificationManager getManager() {
if (mManager == null) {
mManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
}
return mManager;
}
public NotificationCompat.Builder getChannelNotification() {
return new NotificationCompat.Builder(getApplicationContext(), channelID)
.setContentTitle("Jau laikas")
.setContentText("Užpildyti savo dienos ataskaitą!!!")
.setSmallIcon(R.mipmap.ic_launcher_round);
}
}
还有我的其他活动
package com.example.moksleiviopinigai;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.app.TimePickerDialog;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.TimePicker;
import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.DialogFragment;
import java.text.DateFormat;
import java.util.Calendar;
public class Notification extends AppCompatActivity implements TimePickerDialog.OnTimeSetListener {
private TextView mTextView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_notification);
mTextView = findViewById(R.id.textView);
Button buttonTimePicker = findViewById(R.id.button_timepicker);
buttonTimePicker.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
DialogFragment timePicker = new TimePickerFragment();
timePicker.show(getSupportFragmentManager(), "time picker");
}
});
Button buttonCancelAlarm = findViewById(R.id.button_cancel);
buttonCancelAlarm.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
cancelAlarm();
}
});
}
@Override
public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
Calendar c = Calendar.getInstance();
c.set(Calendar.HOUR_OF_DAY, hourOfDay);
c.set(Calendar.MINUTE, minute);
c.set(Calendar.SECOND, 0);
updateTimeText(c);
startAlarm(c);
}
private void updateTimeText(Calendar c) {
String timeText = "Alarm set for: ";
timeText += DateFormat.getTimeInstance(DateFormat.SHORT).format(c.getTime());
mTextView.setText(timeText);
}
private void startAlarm(Calendar c) {
AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
Intent intent = new Intent(this, AlertReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 1, intent, 0);
if (c.before(Calendar.getInstance())) {
c.add(Calendar.DATE, 1);
}
alarmManager.setExact(AlarmManager.RTC_WAKEUP, c.getTimeInMillis(), pendingIntent);
}
private void cancelAlarm() {
AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
Intent intent = new Intent(this, AlertReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 1, intent, 0);
alarmManager.cancel(pendingIntent);
mTextView.setText("Alarm canceled");
}
}
和
package com.example.moksleiviopinigai;
import android.app.Dialog;
import android.app.TimePickerDialog;
import android.os.Bundle;
import android.text.format.DateFormat;
import androidx.annotation.NonNull;
import androidx.fragment.app.DialogFragment;
import java.util.Calendar;
public class TimePickerFragment extends DialogFragment {
@NonNull
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
Calendar c = Calendar.getInstance();
int hour = c.get(Calendar.HOUR_OF_DAY);
int minute = c.get(Calendar.MINUTE);
return new TimePickerDialog(getActivity(), (TimePickerDialog.OnTimeSetListener) getActivity(), hour, minute, DateFormat.is24HourFormat(getActivity()));
}
}
和
package com.example.moksleiviopinigai;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import androidx.core.app.NotificationCompat;
public class AlertReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
NotificationHelper notificationHelper = new NotificationHelper(context);
NotificationCompat.Builder nb = notificationHelper.getChannelNotification();
notificationHelper.getManager().notify(1, nb.build());
}
}
解决方案
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