Question

每当运行服务时，我都试图从我的MainActivity.class SharedPrefs修改变量（Happiness）。我似乎无法弄清楚如何做到这一点。请在下面找到我的代码，我的结果以happiness = -1结束，这是因为我理解prefEditor.putInt但不确定如何继续修改和返回值。

public class MainActivity extends Activity {

int Health = 100;
private static final int Happiness = 100;
int Hunger = 0;
int Level = 1;
EditText happiness_display,
         health_display,
         hunger_display,
         level_display;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        SharedPreferences settings = getSharedPreferences("APP_PREFS",
                                                  MODE_PRIVATE);
        SharedPreferences.Editor prefEditor = settings.edit();
        prefEditor.putInt("HAPPINESS", Happiness);
        prefEditor.commit();

        WebView myWebView = (WebView) findViewById(R.id.pet_display);
        myWebView.loadUrl("file:///android_asset/renamon.gif");
        myWebView.setInitialScale(10000);


        ShowToast();

        TextView happiness = (TextView) findViewById(R.id.happiness_display);
        happiness.setText(Integer.toString(Happiness));

        Calendar cal = Calendar.getInstance();

        Intent intent = new Intent(this, chronos.class);
        PendingIntent pintent = PendingIntent.getService(this, 0, intent, 0);

        AlarmManager alarm = (AlarmManager)getSystemService(Context.ALARM_SERVICE);

        // Start every 30 seconds
        alarm.setRepeating(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(), 30*1000, pintent); 
    }


    private void ShowToast() {
        Toast.makeText(getApplicationContext(), "Toast method invoked from on create " + Happiness, Toast.LENGTH_LONG).show();
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }

}

public class chronos extends Service {

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

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        SharedPreferences settings = getSharedPreferences("APP_PREFS",
                MODE_PRIVATE);
        SharedPreferences.Editor prefEditor = settings.edit();
        prefEditor.putInt("HAPPINESS",  - 1);
        prefEditor.commit();
        Toast.makeText(getBaseContext(), "Chronos running" + settings.getInt("HAPPINESS", 0), Toast.LENGTH_LONG).show();


        return super.onStartCommand(intent, flags, startId);
    }
}

如果我的方法错误（可能是：P）

，任何帮助都会得到赞赏或指向正确的方向

这可能是我的不连贯，但我基本上想要修改幸福，健康等的价值..每次运行服务时，就像游戏循环，但虚拟宠物。

我的IntentService中的示例代码

happiness = happiness - 1;
        SharedPreferences.Editor prefEditor = settings.edit();
        prefEditor.putInt("HAPPINESS", happiness);
        prefEditor.commit();

我只是希望每次运行服务时都要从某些变量中减去一定数量的金额。

Answer 1

试试这个。

首先，使用IntentService代替Service，因为它会阻止UI线程。

喜欢这个

public class chronos extends IntentService {

    int happiness;
    public chronos() {
        super("chronos");
        // TODO Auto-generated constructor stub
    }

    @Override
    protected void onHandleIntent(Intent intent) {
        // TODO Auto-generated method stub

        SharedPreferences settings = getSharedPreferences("APP_PREFS",
                MODE_PRIVATE);

            happiness = settings.getInt("HAPPINESS",0) - 1;

            SharedPreferences.Editor prefEditor = settings.edit();
            prefEditor.putInt("HAPPINESS",happiness);
            prefEditor.commit();

        Toast.makeText(getBaseContext(),
                "Chronos running" + settings.getInt("HAPPINESS", 0),
                Toast.LENGTH_LONG).show();

    }

}

如果您想从服务更新MainActivity的TextView值，需要使用BroadcastReceiver

从我的Service类中的MainActivity修改变量，然后使用变量更新TextView

1 个答案: