podlite/src/com/miniabs/LoginActivity.java

package com.miniabs;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.text.InputType;
import android.view.View;
import android.view.inputmethod.InputMethodManager;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.EditText;
import android.widget.TextView;

public class LoginActivity extends Activity {
    private EditText server, user, pass;
    private CheckBox useKey;
    private TextView status, userLabel, passLabel;
    private Button connect;

    @Override
    protected void onCreate(Bundle b) {
        super.onCreate(b);
        setContentView(R.layout.activity_login);
        server = (EditText) findViewById(R.id.server);
        user = (EditText) findViewById(R.id.user);
        pass = (EditText) findViewById(R.id.pass);
        useKey = (CheckBox) findViewById(R.id.use_key);
        status = (TextView) findViewById(R.id.status);
        userLabel = (TextView) findViewById(R.id.user_label);
        passLabel = (TextView) findViewById(R.id.pass_label);
        connect = (Button) findViewById(R.id.connect);

        Prefs p = Prefs.get(this);
        server.setText(p.server());
        user.setText(p.username());
        String msg = getIntent().getStringExtra("message");
        if (msg != null) status.setText(msg);

        useKey.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            public void onCheckedChanged(CompoundButton v, boolean on) {
                int vis = on ? View.GONE : View.VISIBLE;
                user.setVisibility(vis);
                userLabel.setVisibility(vis);
                passLabel.setText(on ? "Chave da API" : "Contrasinal");
                pass.setInputType(on ? InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_FLAG_NO_SUGGESTIONS
                        : InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_PASSWORD);
                pass.setText("");
            }
        });
        connect.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                go();
            }
        });
    }

    static String normalize(String s) {
        s = s.trim();
        while (s.endsWith("/")) s = s.substring(0, s.length() - 1);
        if (s.endsWith("/login")) s = s.substring(0, s.length() - 6);
        if (s.length() > 0 && !s.startsWith("http://") && !s.startsWith("https://")) s = "http://" + s;
        return s;
    }

    private void go() {
        final String srv = normalize(server.getText().toString());
        final String u = user.getText().toString().trim();
        final String pw = pass.getText().toString();
        final boolean key = useKey.isChecked();
        if (srv.length() == 0) {
            status.setText("Escribe o enderezo do servidor.");
            return;
        }
        if (key ? pw.trim().length() == 0 : u.length() == 0) {
            status.setText(key ? "Pega a túa chave da API." : "Escribe o teu usuario.");
            return;
        }
        server.setText(srv);
        ((InputMethodManager) getSystemService(INPUT_METHOD_SERVICE)).hideSoftInputFromWindow(pass.getWindowToken(), 0);
        connect.setEnabled(false);
        status.setText("Conectando…");

        final Prefs p = Prefs.get(this);
        p.logout();
        App.clear();
        HomeActivity.clearCache();
        p.setServer(srv);
        Trust.lastRejected = null;
        new Job<String>() {
            String work() throws Exception {
                String version = Api.status(LoginActivity.this, srv);
                String lib;
                if (key) {
                    Api.loginWithKey(LoginActivity.this, pw.trim());
                    lib = "";
                } else {
                    lib = Api.login(LoginActivity.this, srv, u, pw);
                }
                if (lib.length() > 0) p.setLibrary(lib, "");
                return version;
            }

            void done(String version) {
                startActivity(new Intent(LoginActivity.this, HomeActivity.class)
                        .addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP));
                finish();
            }

            void failed(Exception e) {
                connect.setEnabled(true);
                status.setText(Util.describe(e));
                TrustPrompt.offer(LoginActivity.this, new Runnable() {
                    public void run() {
                        go();
                    }
                });
            }
        }.start();
    }
}