Android 天气应用开发

public class MainActivity extends Activity implements View.OnClickListener, Runnable {
    static String TAG = "Weather";
    Button getWeather;
    TextView showJson;

    private static Handler myHandler;
    Thread networkThread;


    String httpUrl = "http://apis.baidu.com/heweather/weather/free";
    String httpArg = "city=dalian";
    String jsonResult;
    boolean threadIsAlive;

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

        getWeather = (Button) findViewById(R.id.getWeather);
        getWeather.setOnClickListener(this);
        showJson = (TextView) findViewById(R.id.showJson);
        showJson.setMovementMethod(ScrollingMovementMethod.getInstance());

        networkThread = new Thread(this);

        myHandler = new Handler(new Handler.Callback() {
            @Override
            public boolean handleMessage(Message msg) {
                showJson.setText(jsonResult);
                return true;
            }
        });
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.getWeather:
                if (!threadIsAlive) {
                    networkThread.start();
                    threadIsAlive = true;
                }
                break;
            default:
                break;
        }
    }


    @Override
    public void run() {
        jsonResult = request(httpUrl, httpArg);
        myHandler.sendEmptyMessage(0);
//        Log.i(TAG, jsonResult);
    }

    /**
     * @param httpUrl :请求接口
     * @param httpArg :参数
     * @return 返回结果
     */
    public static String request(String httpUrl, String httpArg) {
        BufferedReader reader;
        String result = null;
        StringBuffer sbf = new StringBuffer();
        httpUrl = httpUrl + "?" + httpArg;

        try {
            URL url = new URL(httpUrl);
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setRequestMethod("GET");
            // 填入apikey到HTTP header
            connection.setRequestProperty("apikey", "apikey请在百度开发者个人中心-个人信息中查看");
            connection.connect();
            InputStream is = connection.getInputStream();
            reader = new BufferedReader(new InputStreamReader(is, "UTF-8"));
            String strRead;
            while ((strRead = reader.readLine()) != null) {
                sbf.append(strRead);
                sbf.append("\r\n");
            }
            reader.close();
            result = sbf.toString();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    }

}