我正在尝试从我的 PreferenceActivity 启动服务。我想在每个 onPreferenceChangeListenr 上启动一个服务。
我的 onPreferenceChangeListener 中有四个条件,每个条件都必须以不同的值启动相同的服务。
当我第一次更改首选项时,它会启动服务,当我第二次更改首选项时,它会使用新值启动服务,但它不会停止执行前一个条件,所以现在我有一个服务正在产生结果两个条件,如果我第三次更改首选项,它会开始为三个条件生成结果,但我需要的是仅针对当前条件运行此服务。
这是我的PreferenceActivity's
代码:-
public class Preferences extends PreferenceActivity
{
private Button button;
ListPreference lp;
private Context context;
private long duration;
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.preferences);
context = this;
lp = (ListPreference)findPreference("autoduration");
final Intent intent = new Intent(context, BackService.class);
lp.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener()
{
public boolean onPreferenceChange(Preference preference, Object newValue)
{
String newSelection = newValue.toString();
int index = lp.findIndexOfValue(newSelection);
stopService(intent);
if(index==0)
{
duration = 15000;
}
else if(index==1)
{
duration = 12000;
}
else if(index==2)
{
duration = 10000;
}
else if(index==3)
{
IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON);
filter.addAction(Intent.ACTION_SCREEN_OFF);
BroadcastReceiver receiver = new ScreenReceiver();
registerReceiver(receiver, filter);
}
intent.putExtra("duration", duration);
startService(intent);
return true;
}
});
}
@Override
public void onDestroy()
{
super.onDestroy();
unregisterReceiver(receiver);
}
}
它是我的服务代码,应该受我的 PreferenceActivity 影响。:-
private static Timer myTimer = new Timer();
public static final String TAG = "BackService";
private MainTask mainTask = new MainTask();
public void onStart(Intent intent, int startId)
{
Long duration = intent.getLongExtra("duration", 7000);
startServices(duration);
}
public void startServices(Long dur)
{
myTimer.scheduleAtFixedRate(mainTask,0,dur);
}
private class MainTask extends TimerTask
{
@Override
public void run() {
Log.e(TAG, "I am HERE");
}
}
这是我的广播接收器:-
public class ScreenReceiver extends BroadcastReceiver {
public static boolean screenOn = true;
private static final String TAG = "ScreenReceiver";
@Override
public void onReceive(Context context, Intent intent)
{
if(intent.getAction().equals(Intent.ACTION_SCREEN_ON))
{
Log.e(TAG, "I am receiver");
}
}
}
我不知道我在做什么错所以请帮助!
谢谢