我是Java和Android開發的新手，嘗試創建一個簡單的應用程序，該應用程序應與Web服務器聯系并使用http get將一些數據添加到數據庫中。當我在計算機上使用網絡瀏覽器撥打電話時，它工作正常。但是，當我進行在Android模擬器中運行應用程序的通話時，不會添加任何數據。我已將Internet權限添加到該應用的清單中。Logcat不報告任何問題。誰能幫助我找出問題所在？這是源代碼：package com.example.httptest;import java.io.IOException;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import android.app.Activity;import android.os.Bundle;import android.util.Log;import android.widget.TextView;public class HttpTestActivity extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); TextView tv = new TextView(this); setContentView(tv); try { URL url = new URL("http://www.mysite.se/index.asp?data=99"); HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection(); urlConnection.disconnect(); tv.setText("Hello!"); } catch (MalformedURLException ex) { Log.e("httptest",Log.getStackTraceString(ex)); } catch (IOException ex) { Log.e("httptest",Log.getStackTraceString(ex)); } } }
3 回答
慕勒3428872
TA貢獻1848條經驗 獲得超6個贊
這是完整的AsyncTask課程
public class GetMethodDemo extends AsyncTask<String , Void ,String> {
String server_response;
@Override
protected String doInBackground(String... strings) {
URL url;
HttpURLConnection urlConnection = null;
try {
url = new URL(strings[0]);
urlConnection = (HttpURLConnection) url.openConnection();
int responseCode = urlConnection.getResponseCode();
if(responseCode == HttpURLConnection.HTTP_OK){
server_response = readStream(urlConnection.getInputStream());
Log.v("CatalogClient", server_response);
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
Log.e("Response", "" + server_response);
}
}
// Converting InputStream to String
private String readStream(InputStream in) {
BufferedReader reader = null;
StringBuffer response = new StringBuffer();
try {
reader = new BufferedReader(new InputStreamReader(in));
String line = "";
while ((line = reader.readLine()) != null) {
response.append(line);
}
} catch (IOException e) {
e.printStackTrace();
} finally {
if (reader != null) {
try {
reader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return response.toString();
}
召喚這AsyncTask堂課
new GetMethodDemo().execute("your web-service url");
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