android - 使用 HTTP AsyncTask 登录

Question

我一直在与 AsyncTask 作斗争。我找不到错误。我不明白为什么 AsyncTask 不起作用，尽管我在这里只有 String 和 Boolean。请帮助。谢谢你。

onPostExecute 部分的错误是:

The method did not override method from its superclass.

    public class UserLoginTask extends AsyncTask<String, String, String> {

    private final String mEmail;
    private final String mPassword;

    UserLoginTask(String email, String password) {
        mEmail = email;
        mPassword = password;
    }

    @Override
    protected String doInBackground(String... arg0) {
        try{
            for (String credential : DUMMY_CREDENTIALS) {
                String[] pieces = credential.split(":");
                if (pieces[0].equals(mEmail) && pieces[1].equals(mPassword)) {
                    // Account exists, return true if the password matches.
                    pieces[0]=arg0[0];
                    pieces[1]=arg0[1];
                }
            }
            String username = (String)arg0[0];
            String password = (String)arg0[1];
            Log.i("Username", username);
            Log.i("Password", password);
            String link="http://";
            Log.i("link", link);

            // Prep HTTP for use
            HttpClient client=new DefaultHttpClient();
            HttpPost post = new HttpPost(link);

            // Prep data for sending to server
            List<NameValuePair> pairs = new ArrayList<NameValuePair>();
            pairs.add(new BasicNameValuePair("username", username));
            pairs.add(new BasicNameValuePair("password", password));
            post.setEntity(new UrlEncodedFormEntity(pairs));

            // Send data to server
            HttpResponse response = client.execute(post);

            String responseText = null;

            // Time to evaluate how server reacted
            try {
                // try to get server response
                responseText = EntityUtils.toString(response.getEntity());
                Log.i("Server Response: ", responseText);
            }
            catch (Exception e) {
                // Failed to get server response, log why it failed.
                e.printStackTrace();
                Log.i("Parse Exception", e + "");
            }
            return responseText;
        }
        catch(Exception e){
            Log.i("exception", "error");
            return new String("Exception: " + e.getMessage());
        }
    }

    @Override
    protected void onPostExecute(final boolean success) {
        mAuthTask = null;
        finish();
        if (success) {
            finish();
            Intent myIntent = new Intent(membership.this, membership_memberonly.class);
            membership.this.startActivity(myIntent);
        } else {
            mPasswordView.setError(getString(R.string.error_incorrect_password));
            mPasswordView.requestFocus();
        }
    }

    @Override
    protected void onCancelled() {
        mAuthTask = null;
    }
}

Answer 1

那么，您有 2 个 doInBackground 方法。只有其中一个应该存在。