title: Unit test an Android activity
body: <p>I'm making an application in the android studio. And for this project, I have to make multiple unit tests. But I have no idea what I can unit test this application. I'm really struggling with unit testing so I would appreciate if someone could help me, or come up with some unit tests I can implement in my project. Its an app with a listview that retrieves data from a web service.</p>
  
  <p>Code: </p>
  
  <pre><code> public class MainActivity extends AppCompatActivity {
  
  ListView listView;
  ArrayAdapter&lt;String&gt; adapter;
  String[] data;
  String[] waarde;
  String[] hoog;
  String[] laag;
  
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
  
      listView = findViewById(R.id.listview);
  
      StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder().permitNetwork().build());
  
      getData();
  
      listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
          @Override
          public void onItemClick(AdapterView&lt;?&gt; parent, View view, int position, long id) {
          Intent intent = new Intent(MainActivity.this, Showdata.class);
          intent.putExtra("teeltbed", listView.getItemAtPosition(position).toString());
          startActivity(intent);
          }
      });
  
  }
  
  private void getData()
  {
      String getData = null;
      String dbResult = "empty";
      dbConnect database = new dbConnect(this);
  
      try{
          String query = "SELECT * FROM Lamp";
          getData = "?query=" + URLEncoder.encode(query, "UTF-8");
          //data += "&amp;username=" + URLEncoder.encode(userName, "UTF-8");
          String link = "http://10.247.240.53/kas/lampen.php";
          dbResult = database.execute(link).get();
      }
      catch (Exception e){
  
      }
  
      try{
          JSONObject jsonObject = new JSONObject(dbResult);
          JSONArray array = jsonObject.getJSONArray("Lamp");
          waarde = new String[array.length()];
          data = new String[array.length()];
          hoog = new String[array.length()];
          laag = new String[array.length()];
          for (int i = 0; i &lt; array.length(); i++)
          {
              jsonObject = array.getJSONObject(i);
              data[i] = jsonObject.getString("teeltbed");
              waarde[i] = "A: " + jsonObject.getString("waarde") + " %";
              hoog[i] = "H: " + jsonObject.getString("hoog") + " W/m2";
              laag[i] = "L: " + jsonObject.getString("laag") + " W/m2";
  
          }
  
          listView.setAdapter(new dataListAdapter(data, waarde, hoog, laag));
      }
  
      catch (Exception e)
      {
          e.printStackTrace();
      }
  }
  
  class dataListAdapter extends BaseAdapter{
      String[] data, waarde;
  
      dataListAdapter(){
          data = null;
          waarde = null;
      }
  
      public dataListAdapter(String[] sdata, String[]swaarde, String[]shoog, String[]slaag)
      {
          data = sdata;
          waarde = swaarde;
          hoog = shoog;
          laag = slaag;
  
      }
  
      public int getCount()
      {
          return data.length;
      }
  
      public Object getItem(int arg0) {
          // TODO Auto-generated method stub
          return null;
      }
  
      public long getItemId(int position) {
          // TODO Auto-generated method stub
          return position;
      }
  
      public View getView (int position, View convertView, ViewGroup parent)
      {
          LayoutInflater inflater = getLayoutInflater();
          View row;
          row = inflater.inflate(R.layout.layout_list, parent, false);
          TextView t1, t2, t3, t4;
          t1 = (TextView) row.findViewById(R.id.list_item);
          t2 = (TextView) row.findViewById(R.id.list_item2);
          t3 = (TextView) row.findViewById(R.id.list_item3);
          t4 = (TextView) row.findViewById(R.id.list_item4);
          t1.setText(data[position]);
          t2.setText(waarde[position]);
          t3.setText(hoog[position]);
          t4.setText(laag[position]);
          return (row);
      }
  }
  
  class Sproeier
  {
   public int TeeltBed;
   public String Stand;
   public double Actueel;
   public double Hoog;
   public double Laag;
  
   public void Sproeier()
   {
       int teeltbed;
       double hoog;
       double laag;
   }
  }
  
  class Lamp {
  
  }
  
  public static class ScadaWebservice
  {
  
  }
  
  class Kas
  {
  
      public void kas()
      {
  
      }
  }
  </code></pre>
  
  <p>}</p>