Android Studio解析JSON并将对象添加到数组中只需按第二个按钮?

我的Android Studio应用程序有一个问题,因为我试图从URL解析JSON数据,并用数据创建对象“Director”,然后将每个对象存储在一个数组中。问题是,当我按下按钮启动执行此操作的方法时,Logcat显示在方法的末尾没有向数组添加任何内容。但是,当我第二次按下按钮时,它们会被添加到数组中。以下是我的代码:

public class MainActivity extends AppCompatActivity implements MainAdapter.OnCompanyClickedListener {

    private Button search;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //Button to start method
        search = (Button) findViewById(R.id.btnSearch);
        search.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v) {
                searchCompanyDirectors("02293426");
            }
        });
    }

    //Parse JSON File From API and Create Directors
    public void searchCompanyDirectors(final String companyNumber){
        Thread thread = new Thread(new Runnable(){
            @Override
            public void run(){
                HttpClient httpClient = new HttpClient();
                try{
                    final String response = httpClient.run("https://MyApiURL"+companyNumber);
                    runOnUiThread(new Runnable(){
                        @Override
                        public void run(){
                            try {
                                JSONObject jsonObject = new JSONObject(response);
                                JSONArray array = jsonObject.getJSONArray("items");
                                for (int i = 0; i < array.length();i++){
                                    JSONObject o = array.getJSONObject(i);
                                    String appointment = o.getString("links");
                                    String parsedAppointment = parseApp(appointment);

                                    Director director = new Director(o.getString("name"),parsedAppointment);
                                    Director.directorList.add(director);
                                }
                            Log.d("tag1",Director.directorList.toString());
                            }catch (JSONException e){
                                e.printStackTrace();
                            }
                        }
                    });
                }
                catch (Exception ex){
                    ex.printStackTrace();
                }
            }
        });
        thread.start();
        Log.d("tag2",Director.directorList.toString());
    }

    //Parse Returned String From JSON
    public String parseApp(String appointment){
        String[] arrayDirectors = appointment.split("/",3);
        String[] split = arrayDirectors[2].split("\\\\");
        return split[0];
    }
}

    @Override
    public void onCompanyClicked(int position){
        //Do stuff with directorlist...
    }

我的导演班:

public class Director {

    private String name;
    private String appointment;

    public static List<Director> directorList = new ArrayList<>();

    public Director (String name, String appointment){
        this.name = name;
        this.appointment = appointment;
    }

    public String getName() {

        return name;
    }
}

按下第一个按钮时,Logcat“tag1”输出:

[Director1, Director2, Director3]

按下第一个按钮时,Logcat“tag2”输出:

[]

按下第二个按钮时,Logcat“tag1”输出:

[Director1, Director2, Director3, Director1, Director2, Director3]

按下第二个按钮时,Logcat“tag2”输出:

[导演1,导演2,导演3]

当我试图在最后一个方法中使用directorList时(它基于directorList数组执行操作),问题就出现了,但是由于第一次按按钮完成该方法时数组是空的,所以它没有执行它应该执行的操作。我也不确定为什么Logcat“tag2”在方法中间显示要添加到数组中的值,然后在方法末尾显示空数组,而Logcat“tag1”显示要添加的值?