Java 在我的服务类中修改MainActivity中的变量,然后使用变量更新TextView
每当运行服务时,我都试图修改MainActivity.class SharedPrefs中的一个变量(Happiness)。我似乎不知道该怎么做。请在下面找到我的代码,我的结果是happiness=-1,这是因为prefEditor.putInt我理解,但不确定如何继续修改和返回值Java 在我的服务类中修改MainActivity中的变量,然后使用变量更新TextView,java,android,Java,Android,每当运行服务时,我都试图修改MainActivity.class SharedPrefs中的一个变量(Happiness)。我似乎不知道该怎么做。请在下面找到我的代码,我的结果是happiness=-1,这是因为prefEditor.putInt我理解,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; in
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);
}
}
如果我的方法是错误的,任何帮助或正确方向上的一点都是值得赞赏的(可能是:p)
这可能是我的语无伦次,但我基本上想修改幸福、健康等的价值观。。每次运行该服务时,就像一个游戏循环,但针对虚拟宠物
my IntentService中的示例代码
happiness = happiness - 1;
SharedPreferences.Editor prefEditor = settings.edit();
prefEditor.putInt("HAPPINESS", happiness);
prefEditor.commit();
我只是希望每次服务运行时,它都能从一些变量中减去一个设定值。试试这个
首先,使用IntentService
而不是Service
,因为它会阻塞UI线程
像这样
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();
}
}
如果要从服务更新MainActivity的
TextView
值,需要使用不会修改存储在SharedRef键“Happiness”中的Happiness变量值的?我要澄清的toast消息是为了调试,例如它显示的值是“-1”,而不是新的幸福值应该是“99”(100-1),它不能执行算术运算,您需要单独执行此操作,然后将结果存储回共享首选项。请您解释一下如何执行实际的算术运算好吗?每次服务运行时,它都应该从主活动更新您的视图??你能告诉我你在服务中要做什么样的操作吗?主要是从主活动中设置的变量中减去,例如每半小时减去一次快乐,减去三次饥饿等等。。