我正在开发一个与我的网站通信的小型测试应用程序。它使用凭据创建 HttpPost，以便查看用户是否已注册。
但是，由于某种原因，该帖子是立即发布的，尽管它应该需要一秒钟并且总是空的。这是我大约一年前使用的类(class)，当时正在工作。
private class LoginTask extends AsyncTask<String, Integer, String> {
private HashMap<String, String> mData = null;// post data
public String serverResult = "";
/**
* constructor
*/
public LoginTask(HashMap<String, String> data) {
mData = data;
}
/**
* background
*/
@Override
protected String doInBackground(String... params) {
byte[] result = null;
String str = "";
HttpClient client = new DefaultHttpClient();
HttpPost post = new HttpPost(params[0]);// in this case, params[0] is URL
try {
// set up post data
ArrayList<NameValuePair> nameValuePair = new ArrayList<NameValuePair>();
Iterator<String> it = mData.keySet().iterator();
while (it.hasNext()) {
String key = it.next();
nameValuePair.add(new BasicNameValuePair(key, mData.get(key)));
}
post.setEntity(new UrlEncodedFormEntity(nameValuePair, "UTF-8"));
HttpResponse response = client.execute(post);
StatusLine statusLine = response.getStatusLine();
if(statusLine.getStatusCode() == HttpURLConnection.HTTP_OK){
result = EntityUtils.toByteArray(response.getEntity());
str = new String(result, "UTF-8");
}
}
catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
catch (Exception e) {
}
serverResult = str;
return str;
}
/**
* on getting result
*/
@Override
protected void onPostExecute(String result) {
serverResult = result;
pb.setVisibility(View.GONE);
if(serverResult == "no")
{
Toast t = Toast.makeText(MainActivity.this, "Login failed. Correct username or password", Toast.LENGTH_LONG);
t.show();
}
else if (serverResult.contains("email"))
{
Toast t = Toast.makeText(MainActivity.this, "HELLOOOOO", Toast.LENGTH_LONG);
t.show();
}
else
{
Toast t = Toast.makeText(MainActivity.this, "Server error: " + serverResult, Toast.LENGTH_LONG);
t.show();
}
}
protected void onProgressUpdate(Integer... progress) {
pb.setProgress(progress[0]);
}
}
发送到服务器的信息肯定是正确的，应该检索一些消息回来，但这里它总是空的。也许后台进程有问题。
最佳答案
logcat 中发生了什么？您那里有任何异常(exception)吗？
您是否将互联网权限添加到 list 中？
<uses-permission android:name="android.permission.INTERNET" />
关于java - Android 中的异步 Http Post，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/20666520/