使用android studio 写一个简易的武汉实时公交程序并给出详细源码

好的，下面是一个简单的武汉实时公交程序的示例代码：

1. 首先，创建一个新的 Android Studio 项目，并添加以下依赖项：

dependencies {
    implementation 'com.android.volley:volley:1.2.0'
    implementation 'com.google.code.gson:gson:2.8.6'
}

2. 在布局文件中添加一个 RecyclerView 和一个 ProgressBar：

<androidx.recyclerview.widget.RecyclerView
    android:id="@+id/recyclerView"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

<ProgressBar
    android:id="@+id/progressBar"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center" />

3. 创建一个 BusAdapter 类，用于填充 RecyclerView：

public class BusAdapter extends RecyclerView.Adapter<BusAdapter.BusViewHolder> {

    private List<Bus> buses;

    public BusAdapter() {
        buses = new ArrayList<>();
    }

    public void setBuses(List<Bus> buses) {
        this.buses = buses;
        notifyDataSetChanged();
    }

    @NonNull
    @Override
    public BusViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_bus, parent, false);
        return new BusViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull BusViewHolder holder, int position) {
        Bus bus = buses.get(position);
        holder.route.setText(bus.getRoute());
        holder.busNum.setText(bus.getBusNum());
        holder.startTime.setText(bus.getStartTime());
        holder.endTime.setText(bus.getEndTime());
        holder.interval.setText(bus.getInterval());
    }

    @Override
    public int getItemCount() {
        return buses.size();
    }

    static class BusViewHolder extends RecyclerView.ViewHolder {

        TextView route;
        TextView busNum;
        TextView startTime;
        TextView endTime;
        TextView interval;

        public BusViewHolder(@NonNull View itemView) {
            super(itemView);
            route = itemView.findViewById(R.id.route);
            busNum = itemView.findViewById(R.id.busNum);
            startTime = itemView.findViewById(R.id.startTime);
            endTime = itemView.findViewById(R.id.endTime);
            interval = itemView.findViewById(R.id.interval);
        }
    }
}

4. 创建一个 Bus 类，用于存储公交信息：

public class Bus {

    private String route;
    private String busNum;
    private String startTime;
    private String endTime;
    private String interval;

    public Bus(String route, String busNum, String startTime, String endTime, String interval) {
        this.route = route;
        this.busNum = busNum;
        this.startTime = startTime;
        this.endTime = endTime;
        this.interval = interval;
    }

    public String getRoute() {
        return route;
    }

    public String getBusNum() {
        return busNum;
    }

    public String getStartTime() {
        return startTime;
    }

    public String getEndTime() {
        return endTime;
    }

    public String getInterval() {
        return interval;
    }
}

5. 创建一个 MainActivity 类，用于处理网络请求及其响应：

public class MainActivity extends AppCompatActivity {

    private static final String TAG = "MainActivity";

    private RecyclerView recyclerView;
    private ProgressBar progressBar;

    private BusAdapter busAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        recyclerView = findViewById(R.id.recyclerView);
        progressBar = findViewById(R.id.progressBar);

        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        busAdapter = new BusAdapter();
        recyclerView.setAdapter(busAdapter);

        fetchData();
    }

    private void fetchData() {
        String url = "http://bus.wuhancloud.cn:9087/realBusTime/getRealBusTimeByLine.action?lineId=1";
        RequestQueue requestQueue = Volley.newRequestQueue(this);
        progressBar.setVisibility(View.VISIBLE);

        StringRequest stringRequest = new StringRequest(Request.Method.GET, url, new Response.Listener<String>() {
            @Override
            public void onResponse(String response) {
                progressBar.setVisibility(View.GONE);
                List<Bus> buses = parseResponse(response);
                busAdapter.setBuses(buses);
            }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                progressBar.setVisibility(View.GONE);
                Log.e(TAG, "onErrorResponse: ", error);
            }
        });

        requestQueue.add(stringRequest);
    }

    private List<Bus> parseResponse(String response) {
        List<Bus> buses = new ArrayList<>();

        try {
            JSONArray jsonArray = new JSONArray(response);
            for (int i = 0; i < jsonArray.length(); i++) {
                JSONObject jsonObject = jsonArray.getJSONObject(i);
                String route = jsonObject.getString("route");
                String busNum = jsonObject.getString("busNum");
                String startTime = jsonObject.getString("startTime");
                String endTime = jsonObject.getString("endTime");
                String interval = jsonObject.getString("interval");
                Bus bus = new Bus(route, busNum, startTime, endTime, interval);
                buses.add(bus);
            }
        } catch (JSONException e) {
            Log.e(TAG, "parseResponse: ", e);
        }

        return buses;
    }
}

6. 最后，创建一个 item_bus.xml 布局文件，用于显示每个公交信息：

<TextView
    android:id="@+id/route"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="路线: " />

<TextView
    android:id="@+id/busNum"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="车牌号: " />

<TextView
    android:id="@+id/startTime"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="发车时间: " />

<TextView
    android:id="@+id/endTime"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="末班时间: " />

<TextView
    android:id="@+id/interval"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="发车间隔: " />

这样，一个简单的武汉实时公交程序就完成了。当用户启动该应用程序时，它会发送一个网络请求，并将返回的 JSON 数据解析为 Bus 对象列表。然后，它将这些对象填充到 RecyclerView 中，以显示公交信息。