Fehler Androids Sensormanager mit

Question

Ich habe eine Klasse mit Sensormanager und immer an der Linie gescheitert

sensorManager = (SensorManager) getSystemService(Activity.SENSOR_SERVICE); 

Meine ganze Klasse ist

public class AcceSensorInterface extends AppCompatActivity implements SensorEventListener { 

    private SensorManager sensorManager; 
    private Sensor accelerometer; 

    public Queue<Float> queuex; 
    public Queue<Float> queuey; 
    public Queue<Float> queuez; 

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

    public void createSensorManager(){ 
     sensorManager = (SensorManager) getSystemService(Activity.SENSOR_SERVICE); 
     if (sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER) != null) { 
      // success! we have an accelerometer 
      accelerometer = sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER); 
      sensorManager.registerListener(this, accelerometer, SensorManager.SENSOR_DELAY_NORMAL); 
      // vibrateThreshold = accelerometer.getMaximumRange()/2; 
     } else { 
      // fai! we dont have an accelerometer! 
     } 

     queuex = new ConcurrentLinkedQueue<Float>(); 
     queuey = new ConcurrentLinkedQueue<Float>(); 
     queuez = new ConcurrentLinkedQueue<Float>(); 
    } 

    @Override 
    public void onSensorChanged(SensorEvent event) { 
     queuex.add(Float.valueOf(event.values[0])); 
     queuey.add(Float.valueOf(event.values[1])); 
     queuez.add(Float.valueOf(event.values[2])); 
    } 

    @Override 
    public void onAccuracyChanged(Sensor sensor, int accuracy) { 

    } 

    public void deleteQueues(){ 
     sensorManager.unregisterListener(this); 
     queuex.clear(); 
     queuey.clear(); 
     queuez.clear(); 
    } 
} 

Was könnte falsch sein?

EDIT: Das Fehlerprotokoll ist

04-01 18:03:52.025 31752-31752/com.abbott.forcetest E/AndroidRuntime: FATAL EXCEPTION: main 
                     java.lang.RuntimeException: Unable to resume activity {com.forcetest/com.forcetest.MainActivity}: java.lang.IllegalStateException: System services not available to Activities before onCreate() 
                      at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2616) 
                      at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2644) 
                      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1269) 
                      at android.os.Handler.dispatchMessage(Handler.java:99) 
                      at android.os.Looper.loop(Looper.java:137) 
                      at android.app.ActivityThread.main(ActivityThread.java:4898) 
                      at java.lang.reflect.Method.invokeNative(Native Method) 
                      at java.lang.reflect.Method.invoke(Method.java:511) 
                      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1008) 
                      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:775) 
                      at dalvik.system.NativeStart.main(Native Method) 
                     Caused by: java.lang.IllegalStateException: System services not available to Activities before onCreate() 
                      at android.app.Activity.getSystemService(Activity.java:4603) 
                      at com.abbott.forcetest.AcceInterface.createSensor(AcceInterface.java:25) 
                      at com.abbott.forcetest.RawData.begin_process(RawData.java:277) 
                      at com.abbott.forcetest.RawData.onResume(RawData.java:211) 
                      at android.support.v4.app.Fragment.performResume(Fragment.java:2020) 
                      at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1107) 
                      at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1252) 
                      at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1234) 
                      at android.support.v4.app.FragmentManagerImpl.dispatchResume(FragmentManager.java:2056) 
                      at android.support.v4.app.FragmentController.dispatchResume(FragmentController.java:196) 
                      at android.support.v4.app.FragmentActivity.onResumeFragments(FragmentActivity.java:505) 
                      at android.support.v4.app.FragmentActivity.onPostResume(FragmentActivity.java:494) 
                      at android.support.v7.app.AppCompatActivity.onPostResume(AppCompatActivity.java:161) 
                      at android.app.Activity.performResume(Activity.java:5293) 
                      at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2606) 
                      at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2644)  
                      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1269)  
                      at android.os.Handler.dispatchMessage(Handler.java:99)  
                      at android.os.Looper.loop(Looper.java:137)  
                      at android.app.ActivityThread.main(ActivityThread.java:4898)  
                      at java.lang.reflect.Method.invokeNative(Native Method)  
                      at java.lang.reflect.Method.invoke(Method.java:511)  
                      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1008)  
                      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:775)  
                      at dalvik.system.NativeStart.main(Native Method)  

Dank

Answer 1

Sie benötigen createSensorManager() Methode nach super.onCreate (savedInstanceState) zu verwenden; Methode der Aktivität.

Answer 2

Ich habe in Java-Klasse geändert und im Konstruktor Context übergeben. Es funktioniert jetzt. Mein Code ist wie folgt.

public class AcceInterface implements SensorEventListener { 
    private SensorManager sensorManager; 
    private Sensor accelerometer; 
    public Queue<Float> queuex; 
    public Queue<Float> queuey; 
    public Queue<Float> queuez; 
    public AcceInterface(Context context){ 

     sensorManager = (SensorManager) context.getSystemService(Context.SENSOR_SERVICE); 
     if (sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER) != null) { 
      // success! we have an accelerometer 
      accelerometer = sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER); 
      sensorManager.registerListener(this, accelerometer, SensorManager.SENSOR_DELAY_NORMAL); 
      // vibrateThreshold = accelerometer.getMaximumRange()/2; 
     } else { 
      // fai! we dont have an accelerometer! 
     } 

     queuex = new ConcurrentLinkedQueue<Float>(); 
     queuey = new ConcurrentLinkedQueue<Float>(); 
     queuez = new ConcurrentLinkedQueue<Float>(); 
    } 

    public void deleteSensor(){ 
     sensorManager.unregisterListener(this); 
     queuex.clear(); 
     queuey.clear(); 
     queuez.clear(); 
    } 
    @Override 
    public void onSensorChanged(SensorEvent event) { 
     queuex.add(Float.valueOf(event.values[0])); 
     queuey.add(Float.valueOf(event.values[1])); 
     queuez.add(Float.valueOf(event.values[2])); 
    } 

    @Override 
    public void onAccuracyChanged(Sensor sensor, int accuracy) { 

    } 
}