android - 片段中的 Asynctask 未到达 onPostExecute
问题描述
我正在使用 openweathermap api（5 天预报），并且正在使用 GSON 解析数据。asynctask 与服务器连接，但它不去 onPostExecute。它在收到响应 200 代码后终止。我认为它设置正确，但没有完成程序：
private static class GetWeatherAync extends AsyncTask<Context, Void, List<ForecastWeatherList>> {
private String TAG = GetWeatherAync.class.getSimpleName();
private final String serviceUrl;
private Context mContext;
private Listener listener;
HttpURLConnection urlConnection = null;
public GetWeatherAync(Listener listener, Object mStatusView, Object api_key) {
this.listener = listener;
this.serviceUrl = "http://api.openweathermap.org/data/2.5/forecast?q=" + "Baltimore" + api_key;
}
@Override
protected List<ForecastWeatherList> doInBackground(Context...params) {
try {
Log.d("debugMode", "The application is in doInBackground");
URL url = new URL(serviceUrl);
urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setReadTimeout(10000 /* milliseconds */);
urlConnection.setConnectTimeout(15000 /* milliseconds */);
urlConnection.setRequestMethod("GET");
urlConnection.connect();
// If the request was successful (response code 200),
// then read the input stream and parse the response.
if (urlConnection.getResponseCode() == 200) {
Log.e(TAG,"Response code:" + urlConnection.getResponseCode());
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(urlConnection.getInputStream()));
ForecastWeatherListWrapper weatherWrapper = new Gson().fromJson(bufferedReader, ForecastWeatherListWrapper.class);
return weatherWrapper.getforecastWeatherLists();
} else {
Log.e(TAG, "Error response code: " + urlConnection.getResponseCode());
}
} catch (Exception e) {
}
return null;
}
@Override
protected void onPostExecute(List<ForecastWeatherList> result) {
super.onPostExecute(result);
if (result != null) {
Log.e(TAG, "populate UI recycler view with gson converted data");
listener.afterSearch(result);
}
}
}
这是我的日志：E/GetWeatherAync：响应代码：200
这是我的预报天气列表包装器：
public class ForecastWeatherListWrapper {
@SerializedName("list")
@Expose
private List<ForecastWeatherList> forecastWeatherLists;
public List<ForecastWeatherList> getforecastWeatherLists() {
return forecastWeatherLists;
}
public void setforecastWeatherLists(List<ForecastWeatherList>
forecastWeatherItems){
this.forecastWeatherLists = forecastWeatherItems;
}
}
public class ForecastWeatherList {
@SerializedName("dt")
@Expose
private Integer dt;
@SerializedName("main")
@Expose
private Main main;
@SerializedName("weather")
@Expose
private Weather weather = null;
@SerializedName("clouds")
@Expose
private Clouds clouds;
@SerializedName("wind")
@Expose
private Wind wind;
@SerializedName("rain")
@Expose
private Rain rain;
@SerializedName("sys")
@Expose
private Sys sys;
@SerializedName("dt_txt")
@Expose
private String dtTxt;
public Integer getDt() {
return dt;
}
public void setDt(Integer dt) {
this.dt = dt;
}
public Main getMain() {
return main;
}
public void setMain(Main main) {
this.main = main;
}
public Weather getWeather() {
return (Weather) weather;
}
public void setWeather(Weather weather) {
this.weather = weather;
}
public Clouds getClouds() {
return clouds;
}
public void setClouds(Clouds clouds) {
this.clouds = clouds;
}
public Wind getWind() {
return wind;
}
public void setWind(Wind wind) {
this.wind = wind;
}
public Rain getRain() {
return rain;
}
public void setRain(Rain rain) {
this.rain = rain;
}
public Sys getSys() {
return sys;
}
public void setSys(Sys sys) {
this.sys = sys;
}
public String getDtTxt() {
return dtTxt;
}
public void setDtTxt(String dtTxt) {
this.dtTxt = dtTxt;
}
}
这是我的一些用于解析 JSON 数据的 GSON 类。一些类是 Main、Clouds 等
这是我的主要课程：
public class Main {
@SerializedName("temp")
@Expose
private Double temp;
@SerializedName("temp_min")
@Expose
private Double tempMin;
@SerializedName("temp_max")
@Expose
private Double tempMax;
@SerializedName("pressure")
@Expose
private Double pressure;
@SerializedName("sea_level")
@Expose
private Double seaLevel;
@SerializedName("grnd_level")
@Expose
private Double grndLevel;
@SerializedName("humidity")
@Expose
private Integer humidity;
@SerializedName("temp_kf")
@Expose
private Integer tempKf;
public Double getTemp() {
return temp;
}
public void setTemp(Double temp) {
this.temp = temp;
}
public Double getTempMin() {
return tempMin;
}
public void setTempMin(Double tempMin) {
this.tempMin = tempMin;
}
public Double getTempMax() {
return tempMax;
}
public void setTempMax(Double tempMax) {
this.tempMax = tempMax;
}
public Double getPressure() {
return pressure;
}
public void setPressure(Double pressure) {
this.pressure = pressure;
}
public Double getSeaLevel() {
return seaLevel;
}
public void setSeaLevel(Double seaLevel) {
this.seaLevel = seaLevel;
}
public Double getGrndLevel() {
return grndLevel;
}
public void setGrndLevel(Double grndLevel) {
this.grndLevel = grndLevel;
}
public Integer getHumidity() {
return humidity;
}
public void setHumidity(Integer humidity) {
this.humidity = humidity;
}
public Integer getTempKf() {
return tempKf;
}
public void setTempKf(Integer tempKf) {
this.tempKf = tempKf;
}
}
这是我的天气课：
public class Weather {
@SerializedName("id")
@Expose
private Integer id;
@SerializedName("main")
@Expose
private String main;
@SerializedName("description")
@Expose
private String description;
@SerializedName("icon")
@Expose
private String icon;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getMain() {
return main;
}
public void setMain(String main) {
this.main = main;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public String getIcon() {
return icon;
}
public void setIcon(String icon) {
this.icon = icon;
}
}
这是我的原始字符串数据（我认为）。
"cod":"200",
"message":0.0074,
"cnt":39,
"list":[
{
"dt":1534215600,
"main":{
"temp":293.24,
"temp_min":292.346,
"temp_max":293.24,
"pressure":1021.77,
"sea_level":1028.21,
"grnd_level":1021.77,
"humidity":100,
"temp_kf":0.89
},
"weather":[
{
"id":500,
"main":"Rain",
"description":"light rain",
"icon":"10n"
}
],
"clouds":{
"all":20
},
"wind":{
"speed":2.51,
"deg":275.001
},
"rain":{
"3h":0.0050000000000008
},
"sys":{
"pod":"n"
},
"dt_txt":"2018-08-14 03:00:00"
},
{
"dt":1534226400,
"main":{
"temp":292.3,
"temp_min":291.706,
"temp_max":292.3,
"pressure":1020.99,
"sea_level":1027.42,
"grnd_level":1020.99,
"humidity":100,
"temp_kf":0.6
},
"weather":[
{
"id":800,
"main":"Clear",
"description":"clear sky",
"icon":"01n"
}
],
"clouds":{
"all":0
},
"wind":{
"speed":2.52,
"deg":294.505
},
"rain":{
},
"sys":{
"pod":"n"
},
"dt_txt":"2018-08-14 06:00:00"
},
{
"dt":1534237200,
"main":{
"temp":291.07,
"temp_min":290.77,
"temp_max":291.07,
"pressure":1020.65,
"sea_level":1027.03,
"grnd_level":1020.65,
"humidity":100,
"temp_kf":0.3
},
"weather":[
{
"id":800,
"main":"Clear",
"description":"clear sky",
"icon":"01n"
}
],
"clouds":{
"all":0
},
"wind":{
"speed":1.31,
"deg":225.5
},
"rain":{
},
"sys":{
"pod":"n"
},
"dt_txt":"2018-08-14 09:00:00"
},
{
"dt":1534248000,
"main":{
"temp":293.286,
"temp_min":293.286,
"temp_max":293.286,
"pressure":1020.78,
"sea_level":1027.17,
"grnd_level":1020.78,
"humidity":100,
"temp_kf":0
},
"weather":[
{
"id":800,
"main":"Clear",
"description":"clear sky",
"icon":"02d"
}
],
"clouds":{
"all":8
},
"wind":{
"speed":2.83,
"deg":234.501
},
"rain":{
},
"sys":{
"pod":"d"
},
"dt_txt":"2018-08-14 12:00:00"
},
{
"dt":1534258800,
"main":{
"temp":298.671,
"temp_min":298.671,
"temp_max":298.671,
"pressure":1020.76,
"sea_level":1027.15,
"grnd_level":1020.76,
"humidity":92,
"temp_kf":0
},
"weather":[
{
"id":800,
"main":"Clear",
"description":"clear sky",
"icon":"01d"
}
],
"clouds":{
"all":0
},
"wind":{
"speed":2.71,
"deg":259.5
},
"rain":{
},
"sys":{
"pod":"d"
},
"dt_txt":"2018-08-14 15:00:00"
},
{
"dt":1534269600,
"main":{
"temp":300.7,
"temp_min":300.7,
"temp_max":300.7,
"pressure":1019.76,
"sea_level":1026.18,
"grnd_level":1019.76,
"humidity":83,
"temp_kf":0
},
"weather":[
{
"id":500,
"main":"Rain",
"description":"light rain",
"icon":"10d"
}
],
"clouds":{
"all":24
},
"wind":{
"speed":3.66,
"deg":285.503
},
"rain":{
"3h":1.11
},
"sys":{
"pod":"d"
},
"dt_txt":"2018-08-14 18:00:00"
},
{
"dt":1534280400,
"main":{
"temp":298.464,
"temp_min":298.464,
"temp_max":298.464,
"pressure":1019.68,
"sea_level":1025.97,
"grnd_level":1019.68,
"humidity":83,
"temp_kf":0
},
"weather":[
{
"id":500,
"main":"Rain",
"description":"light rain",
"icon":"10d"
}
],
"clouds":{
"all":48
},
"wind":{
"speed":3.27,
"deg":289.504
},
"rain":{
"3h":1.61
},
"sys":{
"pod":"d"
},
"dt_txt":"2018-08-14 21:00:00"
},
{
"dt":1534291200,
"main":{
"temp":297.882,
"temp_min":297.882,
"temp_max":297.882,
"pressure":1020,
"sea_level":1026.37,
"grnd_level":1020,
"humidity":82,
"temp_kf":0
},
"weather":[
{
"id":500,
"main":"Rain",
"description":"light rain",
"icon":"10n"
}
],
"clouds":{
"all":36
},
"wind":{
"speed":2.37,
"deg":275.004
},
"rain":{
"3h":0.13
},
"sys":{
"pod":"n"
},
"dt_txt":"2018-08-15 00:00:00"
},
{
"dt":1534302000,
"main":{
"temp":295.242,
"temp_min":295.242,
"temp_max":295.242,
"pressure":1021.11,
"sea_level":1027.53,
"grnd_level":1021.11,
"humidity":94,
"temp_kf":0
},
"weather":[
{
"id":802,
"main":"Clouds",
"description":"scattered clouds",
"icon":"03n"
}
],
"clouds":{
"all":32
},
"wind":{
"speed":1.26,
"deg":313.002
},
"rain":{
},
"sys":{
"pod":"n"
},
"dt_txt":"2018-08-15 03:00:00"
},
{
"dt":1534312800,
"main":{
"temp":294.05,
"temp_min":294.05,
"temp_max":294.05,
"pressure":1021.27,
"sea_level":1027.77,
"grnd_level":1021.27,
"humidity":100,
"temp_kf":0
},
"weather":[
{
"id":800,
"main":"Clear",
"description":"clear sky",
"icon":"01n"
}
],
"clouds":{
"all":0
},
"wind":{
"speed":2.46,
"deg":274.504
},
"rain":{
},
"sys":{
"pod":"n"
},
"dt_txt":"2018-08-15 06:00:00"
},
{
"dt":1534323600,
"main":{
"temp":293.495,
"temp_min":293.495,
"temp_max":293.495,
"pressure":1021.36,
"sea_level":1027.7,
"grnd_level":1021.36,
"humidity":100,
"temp_kf":0
},
"weather":[
{
"id":800,
"main":"Clear",
"description":"clear sky",
"icon":"01n"
}
],
"clouds":{
"all":0
},
"wind":{
"speed":3.01,
"deg":277.505
},
"rain":{
},
"sys":{
"pod":"n"
},
"dt_txt":"2018-08-15 09:00:00"
],
"city":{
"id":4347778,
"name":"Baltimore",
"coord":{
"lat":39.2909,
"lon":-76.6108
},
"country":"US",
"population":620961
}
}
解决方案
也许在您打印日志后，当您尝试转换 JSON 对象时发生异常尝试在返回值之前打印日志
Log.e("something",weatherWrapper.getforecastWeatherLists().size()+"")
return weatherWrapper.getforecastWeatherLists();
很可能你有 JSON 转换异常
尝试同时登录 catch 以查看发生了什么
catch (Exception e) {
Log.e("catch","error")
}
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