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我们有一个问题让HttpASyncTask从我们简单的http函数返回一个字符串: 简单地说,我们希望能够将数据发送到一个URL并接收一个适当的响应,我们可以稍后在其他类中使用。直到某一点,httphandler类才会收到正确的响应。HttpAsyncTask返回null作为数据
这里是我们的HttpHandler:
public class HttpRequester extends Activity {
static String result;
public String createUser(String username) {
new HttpAsyncTask().execute("http://188.226.252.112/createPlayer.php?name=" + username);
System.out.println("ID at createUser is; " + result); // this also returns null
return result;
}
public static String GET(String url){
InputStream inputStream = null;
try {
// create HttpClient
HttpClient httpclient = new DefaultHttpClient();
// make GET request to the given URL
HttpResponse httpResponse = httpclient.execute(new HttpGet(url));
// receive response as inputStream
inputStream = httpResponse.getEntity().getContent();
// convert inputstream to string
if(inputStream != null)
result = convertInputStreamToString(inputStream);
else
result = "Did not work!";
} catch (Exception e) {
Log.d("InputStream", e.getLocalizedMessage());
}
System.out.println("ID at GET is; " + result); // this returns correct ID
return result;
}
private static String convertInputStreamToString(InputStream inputStream) throws IOException{
StringBuilder sb = new StringBuilder();
String something;
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
while ((something = bufferedReader.readLine()) != null) {
sb.append(something);
}
inputStream.close();
result = sb.toString();
System.out.println("ID at convert is; " + result); // this returns correct ID
return result;
}
public boolean isConnected(){
ConnectivityManager connMgr = (ConnectivityManager) getSystemService(this.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();
if (networkInfo != null && networkInfo.isConnected())
return true;
else
return false;
}
private class HttpAsyncTask extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... urls) {
return GET(urls[0]);
}
}
}
这里是具有从HTTP处理程序接收数据的其他类的功能:
HttpRequester requester = new HttpRequester();
ID = requester.createUser(login);
System.out.println("ID in other class is: " + ID); // this returns null
请帮助
Regards
Cong Vinh
谢谢!它在我们添加onPostExecute方法时起作用 – 2014-10-08 16:19:41