我正在使用 ListView 來顯示從我的數據庫中檢索到的數據，它假設以前可以工作，但它突然不顯示了。通常它應該顯示這樣的東西（來自其他項目的屏幕截圖）：發布我的所有代碼：public class MainActivity extends AppCompatActivity {private TextView mTextMessage;String[] dataDetail;ArrayList<dataDetail> allDetail = new ArrayList<>();ListView detailList;final Context context = this;final int min = 0;final int max = 10;final int random = new Random().nextInt((max - min) + 1) + min;int score = 0;private BottomNavigationView.OnNavigationItemSelectedListener mOnNavigationItemSelectedListener        = new BottomNavigationView.OnNavigationItemSelectedListener() {    @Override    public boolean onNavigationItemSelected(@NonNull MenuItem item) {        switch (item.getItemId()) {            case R.id.navigation_home:                mTextMessage.setText(R.string.title_home);                return true;            case R.id.navigation_dashboard:                mTextMessage.setText(R.string.title_dashboard);                return true;        }        return false;    }};@Overrideprotected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    detailList = findViewById(R.id.dataView);    mTextMessage = (TextView) findViewById(R.id.message);    BottomNavigationView navigation = (BottomNavigationView) findViewById(R.id.navigation);    navigation.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener);    new GetData().execute();}private class GetData extends AsyncTask<Void, Void, ArrayList<dataDetail>> {    protected ArrayList<dataDetail> doInBackground(Void... voids) {        HttpURLConnection urlConnection;        InputStream in = null;        try {            URL url = new URL("http://10.0.2.2:8080/projectServer/DataDetailDB?getdata=true");            urlConnection = (HttpURLConnection) url.openConnection();            in = new BufferedInputStream(urlConnection.getInputStream());        } catch (IOException e) {            e.printStackTrace();        }