NewActivity

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_list_view"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.wiematic.www.sensor.ListViewActivity">

    <ListView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/sensor_data_list_view"
        />

</RelativeLayout>

package com.wiematic.www.sensor;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.widget.ArrayAdapter;
import android.widget.ListView;

import java.util.List;

public class ListViewActivity extends AppCompatActivity {
    public static final String LOG_TAG = MainActivity.class.getSimpleName();
    private SensorDataSource dataSource;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_list_view);
        dataSource = new SensorDataSource(this);
        dataSource.open();

        SensorDataObject DataObject = new SensorDataObject(1 ,320, 5,"test wifi",1,1,1234);
        Log.d(LOG_TAG, "Folgende Einträge sind in der Datenbank vorhanden:");
        showAllListEntries();

        dataSource.close();
    }

    private void showAllListEntries () {
        List<SensorDataObject> SensorDataList = dataSource.getAllSensorDataObjects();


        ArrayAdapter<SensorDataObject> SensorDataArrayAdapter = new ArrayAdapter<>(
                this,
                android.R.layout.simple_list_item_1,
                SensorDataList);

        ListView SensorDataListView = (ListView) findViewById(R.id.sensor_data_list_view);
        SensorDataListView.setAdapter(SensorDataArrayAdapter);
    }
}