Question

在我的应用程序中，警报会创建一个有效的通知，但我正在尝试将字符串值从我的主类FoodItems.java传递到AlarmReceiver.java，后者又将String传递给RingtoneServiceProvider.java，后者创建自定义通知显示。因为它看起来成功传递到AlarmReceiver.java，因为我有一个toast消息显示它之前看到它但是当它转到RingtoneServiceProvider.java它变成＆＃34; null＆＃34;。

这是FoodItems.java的一部分，其中字符串值为＆＃39; name＆＃39;是用户输入的值，我想在通知中显示。

private void setAlarm(Calendar targetCal){

    Toast.makeText(getApplicationContext(),
            "Alarm is set for " + targetCal.getTime(),Toast.LENGTH_LONG).show();

    Intent intent = new Intent(getBaseContext(), AlarmReceiver.class);
    intent.putExtra("data",name);
    intent.putExtra("ID", Alarmnum);
    PendingIntent pendingIntent = PendingIntent.getBroadcast(getBaseContext(),Alarmnum,intent, 0);
    AlarmManager alarmManager = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
    alarmManager.set(AlarmManager.RTC_WAKEUP, targetCal.getTimeInMillis(), pendingIntent);

}

这是AlarmReceiver.java

package com.example.kev00_000.kitchenhero;

import android.app.NotificationManager;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;

public class AlarmReceiver extends BroadcastReceiver {

@Override
public void onReceive(Context context, Intent intent) {

    String name = intent.getStringExtra("data");
    int id = intent.getIntExtra("ID", 1);
    Intent service_intent=new Intent(context, RingtonePlayingService.class);
    service_intent.putExtra("data",name);
    service_intent.putExtra("ID", id);
    context.startService(service_intent);
    NotificationManager notifications = (NotificationManager)
            context.getSystemService(Context.NOTIFICATION_SERVICE);
}
}

这是RingtonePlayingService.java

import android.os.IBinder;
import android.support.annotation.Nullable;
import android.support.v4.app.NotificationCompat;



public class RingtonePlayingService extends Service {

MediaPlayer alarm;
private String name;
private static int NOTIFICATION_ID = 1;

@Nullable
@Override
public IBinder onBind(Intent intent) {
    name = intent.getStringExtra("data");
    NOTIFICATION_ID = intent.getIntExtra("ID", 1);
    return null;
}

public void onCreate(){
    super.onCreate();
    alarm=MediaPlayer.create(this, R.raw.alarmclockbuzz);
    alarm.setLooping(true);

    Intent stopself = new Intent(this, StopAlarm.class);
    PendingIntent pendingIntent
            = PendingIntent.getBroadcast(this, 0, stopself, PendingIntent.FLAG_CANCEL_CURRENT);

    final NotificationCompat.Builder notification
            = new NotificationCompat.Builder(getApplicationContext())
            .setSmallIcon(R.drawable.ic_launcher)
            .setOngoing(true)
            .setContentTitle("KitchenHero")
            .setContentText("Time to put your "+name+" on!!")
            .setAutoCancel(true)
            .setPriority(NotificationCompat.PRIORITY_HIGH)
            .setVibrate(new long[] { 1000, 1000, 1000, 1000, 1000 })
            .addAction(R.drawable.ic_launcher, "STOP", pendingIntent);

    Notification note=notification.build();


    startForeground(NOTIFICATION_ID, note);
}

public int onStartCommand(Intent intent, int flags, int startId) {

    alarm.start();
    return START_NOT_STICKY;
}


public void onDestroy() {
    alarm.stop();
    alarm.release();
}

Answer 1

使用共享首选项执行此操作

public static final String MyPREFERENCES = "MyPrefs" ;
SharedPreferences sharedpreferences;
private void setAlarm(Calendar targetCal){
    sharedpreferences = getSharedPreferences(MyPREFERENCES, Context.MODE_PRIVATE);
    SharedPreferences.Editor editor = sharedpreferences.edit();
    editor.putString("name",name);
    editor.putString("ID",ID);
    editor.commit();

    Toast.makeText(getApplicationContext(),
            "Alarm is set for " + targetCal.getTime(),Toast.LENGTH_LONG).show();

    Intent intent = new Intent(getBaseContext(), AlarmReceiver.class);
    PendingIntent pendingIntent = PendingIntent.getBroadcast(getBaseContext(),Alarmnum,intent, 0);
    AlarmManager alarmManager = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
    alarmManager.set(AlarmManager.RTC_WAKEUP, targetCal.getTimeInMillis(), pendingIntent);

}

在其他类中获取String

 SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);
    String name = preferences.getString("name", "");

在3项活动之间传递价值

1 个答案: