这真让我抓狂。我创建了一个监控加速度计的本地服务。有时该服务有效，有时则无效。似乎该服务只是随机取消注册自己。
该服务会在手机上发生一定程度的移动后做出反应。问题是，如果我启动服务，我可以立即正确地结束它。但是，在我摇动手机（设置服务的行为方式）之后，什么也没有发生，然后当我尝试关闭服务时，我得到了一个错误。真正让我困惑的是，我在检测运动的代码中放入了中断代码，而在运动之后调用的代码甚至没有被执行。
任何帮助将非常感激。这是我的服务及其管理器的代码。
public class AccelService extends Service {
public static boolean listening = false;
private static Context CONTEXT;
private static Sensor sensor;
private static SensorManager ASensorManager;
private static SensorEventListener accelEventListener = new SensorEventListener() {
private float x = 0;
private float y = 0;
private float z = 0;
private double max = 0;
private double force = 0;
public void onAccuracyChanged(Sensor sensor, int accuracy) {}
public void onSensorChanged(SensorEvent event) {
x = event.values[0];
y = event.values[1];
z = event.values[2];
force = Math.sqrt(x*x+y*y+z*z);
if (force > max)
max = force;
if (force > AccelManager.dropValue)
AccelManager.onDrop(force);
}
};
private static void startListener() {
ASensorManager = (SensorManager) CONTEXT.getSystemService(Context.SENSOR_SERVICE);
List<Sensor> sensors = ASensorManager.getSensorList(Sensor.TYPE_ACCELEROMETER);
if (sensors.size() > 0) {
sensor = sensors.get(0);
listening = ASensorManager.registerListener(accelEventListener, sensor, SensorManager.SENSOR_DELAY_GAME);
AccelManager.setListening(listening);
}
}
private final IBinder mBinder = new AccelBinder();
public class AccelBinder extends Binder {
AccelService getService() {
return AccelService.this;
}
}
public void onCreate() {
CONTEXT = this;
startListener();
}
public boolean isListening() {
return listening;
}
@Override
public void onStart(Intent intent, int startId){
Log.i("LocalService", "Received start id " + startId + ": " + intent);
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Log.i("LocalService", "Received start id " + startId + ": " + intent);
return AccelService.START_STICKY;
}
@Override
public void onDestroy() {
if (listening)
stopListening();
super.onDestroy();
}
public static void stopListening() {
AccelManager.setListening(false);
try {
if (ASensorManager != null && accelEventListener != null)
ASensorManager.unregisterListener(accelEventListener);
} catch (Exception e) {}
}
@Override
public IBinder onBind(Intent intent) {
return mBinder;
}
这是经理类。
public class AccelManager extends Activity {
public static Boolean isListening = false;
private static Boolean callMade = false;
public static Context ctxt;
public static int dropValue = 100;
private static Intent i;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
public void setContext(Context context) {
ctxt = context;
i = getIntent();
}
public void activateService(Boolean check) {
if (check)
doBindService();
else {
if (isListening) {
if (AccelWatch != null) {
AccelWatch.stopSelf();
doUnbindService();
}
}
}
}
public static void onDrop(double force){
if (!callMade) {
Toast.makeText(ctxt, "Phone dropped: " + force, 5000).show();
Intent i = new Intent(ctxt,DropDetected.class);
AccelWatch.stopSelf();
doUnbindService();
callMade = true;
ctxt.startActivity(i);
}
}
private void doBindService() {
if (!isListening) {
i = new Intent(ctxt,AccelService.class);
ctxt.bindService(i, AccelConnection, ctxt.BIND_AUTO_CREATE);
}
}
private static void doUnbindService() {
if (isListening)
ctxt.unbindService(AccelConnection);
}
public void setDropValue(int drop) {
dropValue = drop;
}
public boolean isRunning(){
return AccelWatch.isListening();
}
public static void setListening(Boolean listen){
isListening = listen;
}
private static AccelService AccelWatch;
private static ServiceConnection AccelConnection = new ServiceConnection() {
public void onServiceConnected(ComponentName className, IBinder service) {
AccelWatch = ((AccelService.AccelBinder)service).getService();
AccelWatch.startService(i);
Toast.makeText(ctxt, "The service is binded.",Toast.LENGTH_SHORT).show();
}
public void onServiceDisconnected(ComponentName className) {
AccelWatch = null;
Toast.makeText(ctxt, "The service was disconnected.",Toast.LENGTH_SHORT).show();
}
};
}