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ANDROID:在Service类内部,从计划的TimerTask执行Toast(或状态栏通知)方法

[英]ANDROID: inside Service class, executing a method for Toast (or Status Bar notification) from scheduled TimerTask

我试图从定期执行的计划TimerTask中执行Service中的{public void}方法。

此TimerTask定期检查条件。 如果为true,则通过{className}。{methodName}调用方法。

但是,按照Java的要求,如果我想将{className}与{.dot}一起使用,则该方法必须是{pubic static}方法。

问题是此方法用于使用Toast(Android弹出通知)和状态栏进行通知。要使用这些通知,必须使用

Context context = getApplicationContext();

但是,要使此方法起作用,该方法必须没有{static}修饰符,并且必须位于Service类中。

因此,基本上,我希望后台Service从计划的TimerTask中评估条件,并在Service类中执行一个方法。

有人可以帮助我使用Service的正确方法是什么,在循环评估时满足特定条件时调用一种方法?

这是实际的代码行:

TimerTask类(WatchClipboard.java)

public class WatchClipboard extends TimerTask {

    //DECLARATION
    private static GetDefinition getDefinition = new GetDefinition();

    @Override
    public void run() {
        if (WordUp.clipboard.hasText()) {
            WordUp.newCopied = WordUp.clipboard.getText().toString().trim().toLowerCase();
            if (!(WordUp.currentCopied.equals(WordUp.newCopied))) {
                WordUp.currentCopied = WordUp.newCopied;    Log.v(WordUp.TAG, WordUp.currentCopied);

                getDefinition.apiCall_Wordnik();

                FetchService.instantNotification();   //it requires this method to have {static} modifier, if I want call in this way.
            }
        }       
    }
}

和Service类(FetchService.java) :如果将修饰符更改为静态,则会发生{Context}相关问题

public class FetchService extends Service {
    public static final String TAG = "WordUp";  //for Logcat filtering


    //DECLARATION
    private static Timer runningTimer;
    private static final boolean THIS_IS_DAEMON = true;

    private static WatchClipboard watchClipboard;
    private static final long DELAY = 0;
    private static final long PERIOD = 100;

    @Override
    public IBinder onBind(Intent arg0) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public void onCreate() {    Log.v(WordUp.TAG, "FetchService.onCreate()");
        super.onCreate();

        //TESTING SERVICE RUNNING
        watchClipboard = new WatchClipboard();
        runningTimer = new Timer("runningTimer", THIS_IS_DAEMON);
        runningTimer.schedule(watchClipboard, DELAY, PERIOD);
    }

    @Override
    public void onDestroy() {
        super.onDestroy();

        runningTimer.cancel();

        stopSelf(); Log.v(WordUp.TAG, "FetchService.onCreate().stopSelf()");
    }

    public void instantNotification() {   //If I change the modifier to static, {Context} related problems occur
        Context context = getApplicationContext();  // application Context

        //use Toast notification: Need to accept user interaction, and change the duration of show
        Toast toast = Toast.makeText(context, WordUp.newCopied+": "+WordUp.newDefinition, Toast.LENGTH_LONG);
        toast.show();

        //use Status notification: need to automatically expand to show lines of definitions
        NotificationManager mNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);

        int icon = R.drawable.icon;        // icon from resources
        CharSequence tickerText = WordUp.newCopied; // ticker-text
        long when = System.currentTimeMillis(); // notification time
        CharSequence contentTitle = WordUp.newCopied;   //expanded message title
        CharSequence contentText = WordUp.newDefinition;    //expanded message text

        Intent notificationIntent = new Intent(this, WordUp.class);
        PendingIntent contentIntent = PendingIntent.getActivity(this, 0, notificationIntent, 0);

        // the next two lines initialize the Notification, using the configurations above
        Notification notification = new Notification(icon, tickerText, when);
        notification.setLatestEventInfo(context, contentTitle, contentText, contentIntent);

        mNotificationManager.notify(WordUp.WORDUP_STATUS, notification);
    }
}

找到了简单的解决方案。 毕竟这是一个琐碎的问题。

在方法之外声明有问题的数据成员(如{Content}和{Intent}并将其修改为静态可解决问题

不明白为什么我没有提出这个简单的解决方案。

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