2400（ActivityThread.java:221）
在android.app .ActivityThread

H.handleMessage（ActivityThread.java:1897）
在android.os.Handler.dispatchMessage（Handler.java:102）
在android.os .Looper.loop（Looper.java:158）
在android.app.ActivityThread.main（ActivityThread.java:7225）
at java.lang.reflect.Method.invoke（Native Method）
at com.android.internal.os.ZygoteInit

MethodAndArgsCaller.run（ZygoteInit.java:1230）
at com.android.internal.os.ZygoteInit.main（ ZygoteInit.java:1120)
引起：java.lang.IllegalStateException：onCreate（）之前的活动不可用的系统服务
at android.app.Activity.getSystemService（Activity.java:5762)
at com.name.flyrecorder.SensorListener。< init>（SensorListener.java:16）
at com.name.flyrecorde r.CheckStart

I tried to create an App with an Service in background which listen for changes of the acceleration. When i now try to start the Service the app crashes:
This is the Error Message:

05-30 19:11:03.764 12650-12650/com.name.flyrecorder E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.nameflyrecorder, PID: 12650
    java.lang.RuntimeException: Unable to start service com.name.flyrecorder.CheckStart@3d998d with Intent { cmp=com.name.flyrecorder/.CheckStart }: java.lang.IllegalStateException: System services not available to Activities before onCreate()
        at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:4079)
        at android.app.ActivityThread.access$2400(ActivityThread.java:221)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1897)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:158)
        at android.app.ActivityThread.main(ActivityThread.java:7225)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
     Caused by: java.lang.IllegalStateException: System services not available to Activities before onCreate()
        at android.app.Activity.getSystemService(Activity.java:5762)
        at com.name.flyrecorder.SensorListener.<init>(SensorListener.java:16)
        at com.name.flyrecorder.CheckStart$TestAcc.<init>(CheckStart.java:38)
        at com.name.flyrecorder.CheckStart.onStartCommand(CheckStart.java:29)
        at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:4062)
        at android.app.ActivityThread.access$2400(ActivityThread.java:221) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1897) 
        at android.os.Handler.dispatchMessage(Handler.java:102) 
        at android.os.Looper.loop(Looper.java:158) 
        at android.app.ActivityThread.main(ActivityThread.java:7225) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)

What I have tried:

My Mainfest:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.name.flyrecorder">

    <application

        android:allowBackup="true"

        android:icon="@mipmap/ic_launcher"

        android:label="@string/app_name"

        android:roundIcon="@mipmap/ic_launcher_round"

        android:supportsRtl="true"

        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <service android:name=".CheckStart" />
    </application>

</manifest>

This is my Main Activity:

package com.name.flyrecorder;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        startService(new Intent(this, CheckStart.class));
    }
    public void startBackgroundListener(View view){

            startService(new Intent(this, CheckStart.class));
    }
}

My Service:

package com.name.flyrecorder;

import android.app.Service;
import android.content.Intent;
import android.hardware.SensorManager;
import android.os.AsyncTask;
import android.os.IBinder;
import android.support.annotation.Nullable;
import android.util.Log;
import android.widget.Toast;

import java.util.Timer;
import java.util.TimerTask;

public class CheckStart extends Service {
    public CheckStart(){

    }

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId){
        Toast.makeText(this, "Service Started", Toast.LENGTH_SHORT).show();
        new TestAcc().execute();

        return Service.START_NOT_STICKY;
    }
    @Override
    public void onDestroy(){
        Toast.makeText(this,"Service Stopped", Toast.LENGTH_SHORT).show();
    }
    public class TestAcc extends AsyncTask<Void, Void, Void>{
        SensorListener sensorListener = new SensorListener();
        double[] sensor_values = new double[2];
        @Override
        protected Void doInBackground(Void... voids) {
            new Timer().schedule(new TimerTask() {
                @Override
                public void run() {
                    sensor_values = sensorListener.getValues();
                    Log.i("X",String.valueOf(sensor_values[0]));
                    Log.i("Y",String.valueOf(sensor_values[1]));
                    Log.i("Z",String.valueOf(sensor_values[2]));

                }
            },2000

            );
            return null;
        }
    }

}

And my SensorListener:

package com.name.flyrecorder;

import android.app.Activity;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.support.v4.app.FragmentActivity;

public class SensorListener extends FragmentActivity implements SensorEventListener {
    Sensor accelerometer;
    SensorManager sensorManager;
    double ax,ay,az = 0;

    public SensorListener(){
        sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
        sensorManager.registerListener(this, sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),SensorManager.SENSOR_DELAY_NORMAL);
    }
    @Override
    public void onSensorChanged(SensorEvent event) {
        if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER){
            ax = event.values[0];
            ay = event.values[1];
            az = event.values[2];
        }

    }

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

    }
    public double[] getValues(){
        double[] values = {ax,ay,az};
        return values;
    }
}

2400(ActivityThread.java:221) at android.app.ActivityThread

H.handleMessage(ActivityThread.java:1897) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:158) at android.app.ActivityThread.main(ActivityThread.java:7225) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit

MethodAndArgsCaller.run(ZygoteInit.java:1230) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120) Caused by: java.lang.IllegalStateException: System services not available to Activities before onCreate() at android.app.Activity.getSystemService(Activity.java:5762) at com.name.flyrecorder.SensorListener.<init>(SensorListener.java:16) at com.name.flyrecorder.CheckStart