Rx的新功能,所以在寻找将以下AsyncTask转换为Rx的帮助后,希望能够使用我已经知道的某些代码来可视化Rx。我发现了一些其他的答案,这些答案有点相关,但是它们中的很多不需要网络请求,而且许多人使用不同的操作符来提供不同的答案,所以我有点困惑。将AsyncTask转换为RxJava
继承人的的AsyncTask:
这里是我的WhatsTheWeather应用程序的Java代码(从在MainActivity所有代码都包含):
public class MainActivity extends AppCompatActivity {
EditText cityName;
TextView resultTextview;
public void findTheWeather(View view){
Log.i("cityName", cityName.getText().toString());
InputMethodManager mgr = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
mgr.hideSoftInputFromWindow(cityName.getWindowToken(), 0);
try {
String encodedCityName = URLEncoder.encode(cityName.getText().toString(), "UTF-8");
DownLoadTask task = new DownLoadTask();
task.execute("http://api.openweathermap.org/data/2.5/weather?q=" + cityName.getText().toString() + "&appid=a018fc93d922df2c6ae89882e744e32b");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
Toast.makeText(getApplicationContext(),"Could not find weather",Toast.LENGTH_LONG).show();
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
cityName = (EditText)findViewById(R.id.cityName);
resultTextview = (TextView) findViewById(R.id.resultTextView);
}
public class DownLoadTask extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... urls) {
String result = "";
URL url;
HttpURLConnection urlConnection = null;
try {
url = new URL(urls[0]);
urlConnection = (HttpURLConnection)url.openConnection();
InputStream inputStream = urlConnection.getInputStream();
InputStreamReader reader = new InputStreamReader(inputStream);
int data = reader.read();
while(data != -1){
char current = (char) data;
result +=current;
data = reader.read();
}
return result;
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
try {
String message = "";
JSONObject jsonObject = new JSONObject(result);
String weatherInfo = jsonObject.getString("weather");
Log.i("Weather content", weatherInfo);
JSONArray arr = new JSONArray(weatherInfo);
for(int i=0; i<arr.length(); i++){
JSONObject jsonPart = arr.getJSONObject(i);
String main = "";
String description="";
main = jsonPart.getString("main");
description = jsonPart.getString("description");
if(main != "" && description != ""){
message += main + ": "+ description + "\r\n"; //for a line break
}
}
if (message != ""){
resultTextview.setText(message);
} else {
Toast.makeText(getApplicationContext(),"Could not find weather",Toast.LENGTH_LONG).show();
}
} catch (JSONException e) {
Toast.makeText(getApplicationContext(),"Could not find weather",Toast.LENGTH_LONG).show();
}
}
}
你到目前为止尝试过什么? –
如果代码块组织在一起,您的问题会更容易阅读,并且您的实际问题不会分解为块引用。 [Markdown帮助](https://stackoverflow.com/editing-help)文档演示了如何执行此操作。 – jeffbyrnes