使用Android Studio 2.0
没有输出
Log.v(LOG_TAG, "Response Code" + urlConnection.getResponseCode());
Log.v(LOG_TAG, "Error Stream" + urlConnection.getErrorStream());
Log.v(LOG_TAG, "Request Method" + urlConnection.getRequestMethod());
在浏览器上使用内置URI 可以获得正确的结果。
在urlConnection.connect();
调用getRequestMethod()之前给我方法名称GET。
代码
try {
// Construct the URL for the OpenWeatherMap query
// Possible parameters are avaiable at OWM's forecast API page, at
// http://openweathermap.org/API#forecast
final String FORECAST_BASE_URL = "http://api.openweathermap.org/data/2.5/forecast/daily?";
final String QUERY_PARAM = "q";
final String FORMAT_PARAM = "mode";
final String UNITS_PARAM = "units";
final String DAYS_PARAM = "cnt";
final String APPID_PARAM = "APPID";
Uri builtUri = Uri
.parse(FORECAST_BASE_URL)
.buildUpon()
.appendQueryParameter(QUERY_PARAM, params[0])
.appendQueryParameter(FORMAT_PARAM, format)
.appendQueryParameter(UNITS_PARAM, units)
.appendQueryParameter(DAYS_PARAM, Integer.toString(numDays))
.appendQueryParameter(APPID_PARAM,
BuildConfig.OPEN_WEATHER_MAP_API_KEY).build();
URL url = new URL(builtUri.toString());
Log.v(LOG_TAG, "Built URI " + builtUri.toString());
// Create the request to OpenWeatherMap, and open the connection
urlConnection = (HttpURLConnection) url.openConnection();
// urlConnection.setRequestMethod("GET");
urlConnection.connect();
Log.v(LOG_TAG, "Response Code" + urlConnection.getResponseCode());
Log.v(LOG_TAG, "Error Stream" + urlConnection.getErrorStream());
Log.v(LOG_TAG, "Request Method" + urlConnection.getRequestMethod());
// Read the input stream into a String
// InputStream inputStream = urlConnection.getInputStream();
InputStream inputStream;
if (urlConnection.getResponseCode() >= 400) {
inputStream = urlConnection.getErrorStream();
} else {
inputStream = urlConnection.getInputStream();
}
// Log.v(LOG_TAG, "Response Code" +urlConnection.getHeaderFields());
StringBuffer buffer = new StringBuffer();
if (inputStream == null) {
// Nothing to do.
return null;
}
reader = new BufferedReader(new InputStreamReader(inputStream));
String line;
while ((line = reader.readLine()) != null) {
// Since it's JSON, adding a newline isn't necessary (it won't
// affect parsing)
// But it does make debugging a *lot* easier if you print out
// the completed
// buffer for debugging.
buffer.append(line + "\n");
}
if (buffer.length() == 0) {
// Stream was empty. No point in parsing.
return null;
}
forecastJsonStr = buffer.toString();
Log.v(LOG_TAG, "JSON Response " + forecastJsonStr);
} catch (IOException e) {
Log.e(LOG_TAG, "Error", e);
// If the code didn't successfully get the weather data, there's no
// point in attemping
// to parse it.
return null;
} finally {
if (urlConnection != null) {
urlConnection.disconnect();
}
if (reader != null) {
try {
reader.close();
} catch (final IOException e) {
Log.e(LOG_TAG, "Error closing stream", e);
}
}
}
错误记录
04-22 18:42:16.444 9011-9011 / com.android.serverwarrior.sunshine E / ViewRootImpl:sendUserActionEvent()mView == null
04-22 18:42:17.405 9011-9314 / com.android.serverwarrior.sunshine E / FetchWeatherTask:错误
答案 0 :(得分:1)
不知道,但是,我将手机连接到wifi网络,再次发送请求,我得到了JSON resposne。
我确认了,没有网络连接,我没有得到输出。
关于
04-22 18:42:16.444 9011-9011 / com.android.serverwarrior.sunshine E / ViewRootImpl:sendUserActionEvent()mView == null
这是因为三星设备,我从其他帖子得到的这个错误。所以这部分可以忽略。