android开发练习

 引用 http://blog.csdn.net/jediael_lu/article/details/25811579仿照这篇文章写一个类似的程序程序碰上的问题一api更换；查询之后获取最新apiapi.openweathermap.org/data/2.5/weather?q=London问题2java.io.FileNotFoundException: http://api.openweathermap.org/data/2.5/weather?q=London  

url1 = "api.openweathermap.org/data/2.5/weather?q="+location.getText().toString()+",uk&appid=44db6a862fba0b067b1930da0d769e98";

原来是需要apikey

改完之后依然是问题2，进行debug

发现问题出在这里URL url = new URL(url1 );

修改为

URL url = new URL("https://"+url1);

之后成功运行，但输出结果全是0.

发现问题

org.json.JSONException: End of input at character 0 of 

改写部分语句

//等待上述线程完成执行后再返回jsonText。

try {Thread.sleep(1000);return jsonText;} catch (InterruptedException e) {e.printStackTrace();}return null;

java.net.SocketTimeoutException: failed to connect to api.openweathermap.org/192.241.169.168 (port 443) after 15000ms

加了很多断点进入debug查看，发现主线程已经结束了，网络线程还没获取到数据，此时jsontext当然为空

修改源码，将获取网络数据放入AsyncTask中，

class  MyAsycTask extends AsyncTask<String,Void,String>{@Overrideprotected void onPreExecute() {super.onPreExecute();System.out.print("异步线程开始");}@Overrideprotected void onPostExecute(String s) {super.onPostExecute(s);WeatherBean weatherBean = JSONUtil.getWeatherBean(s);country.setText(weatherBean.getCountry());humidity.setText(weatherBean.getHumidity() + "");pressure.setText(weatherBean.getPressure() + "");temperature.setText(weatherBean.getTemperature() + "");System.out.println("test2");}@Overrideprotected String doInBackground(String... params) {InputStream is =null;BufferedReader in = null;String jsonText="";URL url= null;try {url = new URL(params[0]);} catch (MalformedURLException e) {e.printStackTrace();}try {HttpURLConnection conn = (HttpURLConnection) url.openConnection();conn.setReadTimeout(10000 /* milliseconds */);conn.setConnectTimeout(15000 /* milliseconds */);conn.setRequestMethod("GET");conn.setDoInput(true);conn.connect();is = conn.getInputStream();in = new BufferedReader(new InputStreamReader(is));String line = "";while((line = in.readLine()) != null){jsonText += line;}} catch (IOException e) {e.printStackTrace();}finally{try {in.close();is.close();} catch (IOException e) {e.printStackTrace();}}return jsonText;}}

调试了两次之后，成功获取到数据