我试图将MySQL呼应到我的android片段，并将其连接到RecyclerView到另一个Fragment进行布局..但是当我开始尝试AsyncRetrieve时，android为AsyncRetrieve打开了一个新类并在其中实现了execute我尝试进行更改，就好像AsyncRetrieve类是活动一样，但是我失败了，所以如果有人有经验，请推荐一个解决方案
我将inflater更改为View v =
public View onCreateView(LayoutInflater inflater, ViewGroup
container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View v = inflater.inflate(R.layout.fragment_redirect, container,
false);
new AsyncRetrieve().execute();
return v;
然后我正在尝试编写代码
private class AsyncRetrieve extends AsyncTask<String, String, String> {
ProgressDialog pdLoading = new ProgressDialog(MainActivity.this);
HttpURLConnection conn;
URL url = null;
//this method will interact with UI, here display loading message
@Override
protected void onPreExecute() {
super.onPreExecute();
pdLoading.setMessage("\tLoading...");
pdLoading.setCancelable(false);
pdLoading.show();
}
// This method does not interact with UI, You need to pass result to onPostExecute to display
@Override
protected String doInBackground(String... params) {
try {
// Enter URL address where your php file resides
url = new URL("http://192.168.1.7/example.php");
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return e.toString();
}
try {
// Setup HttpURLConnection class to send and receive data from php
conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(READ_TIMEOUT);
conn.setConnectTimeout(CONNECTION_TIMEOUT);
conn.setRequestMethod("GET");
// setDoOutput to true as we recieve data from json file
conn.setDoOutput(true);
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
return e1.toString();
}
try {
int response_code = conn.getResponseCode();
// Check if successful connection made
if (response_code == HttpURLConnection.HTTP_OK) {
// Read data sent from server
InputStream input = conn.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(input));
StringBuilder result = new StringBuilder();
String line;
while ((line = reader.readLine()) != null) {
result.append(line);
}
// Pass data to onPostExecute method
return (result.toString());
} else {
return ("unsuccessful");
}
} catch (IOException e) {
e.printStackTrace();
return e.toString();
} finally {
conn.disconnect();
}
}
// this method will interact with UI, display result sent from doInBackground method
@Override
protected void onPostExecute(String result) {
pdLoading.dismiss();
if(result.equals("Success! This message is from PHP")) {
textPHP.setText(result.toString());
}else{
// you to understand error returned from doInBackground method
Toast.makeText(MainActivity.this, result.toString(), Toast.LENGTH_LONG).show();
}
}
}
}
最佳答案
您从PHP得到任何回应吗？
如果要获取，请使用以下方法在日志中打印该响应。
protected void onPostExecute(String result) {
}
然后绑定到RecyclerView。