Back to project page MeNextAndroid.
The source code is released under:
MIT License
If you think the Android project MeNextAndroid listed in this page is inappropriate, such as containing malicious code/tools or violating the copyright, please email info at java2s dot com, thanks.
package me.menext.menext; //from w w w .jav a2 s . c om import java.util.ArrayList; import java.util.List; import org.apache.http.NameValuePair; import org.apache.http.message.BasicNameValuePair; import org.json.JSONException; import org.json.JSONObject; import android.animation.Animator; import android.animation.AnimatorListenerAdapter; import android.annotation.TargetApi; import android.app.Activity; import android.content.Intent; import android.os.AsyncTask; import android.os.Build; import android.os.Bundle; import android.text.TextUtils; import android.view.KeyEvent; import android.view.Menu; import android.view.View; import android.view.inputmethod.EditorInfo; import android.widget.EditText; import android.widget.TextView; /** * Activity which displays a login screen to the user, offering registration as * well. */ public class LoginActivity extends Activity { /** * The default email to populate the email field with. */ public static final String EXTRA_EMAIL = "com.example.android.authenticatordemo.extra.EMAIL"; /** * Keep track of the login task to ensure we can cancel it if requested. */ private UserLoginTask mAuthTask = null; // Values for email and password at the time of the login attempt. private String mEmail; private String mPassword; // UI references. private EditText mEmailView; private EditText mPasswordView; private View mLoginFormView; private View mLoginStatusView; private TextView mLoginStatusMessageView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_login); mEmailView = (EditText) findViewById(R.id.email); mPasswordView = (EditText) findViewById(R.id.password); mPasswordView .setOnEditorActionListener(new TextView.OnEditorActionListener() { @Override public boolean onEditorAction(TextView textView, int id, KeyEvent keyEvent) { if (id == R.id.login || id == EditorInfo.IME_NULL) { attemptLogin(); return true; } return false; } }); mLoginFormView = findViewById(R.id.login_form); mLoginStatusView = findViewById(R.id.login_status); mLoginStatusMessageView = (TextView) findViewById(R.id.login_status_message); findViewById(R.id.sign_in_button).setOnClickListener( new View.OnClickListener() { @Override public void onClick(View view) { attemptLogin(); } }); } @Override public boolean onCreateOptionsMenu(Menu menu) { super.onCreateOptionsMenu(menu); getMenuInflater().inflate(R.menu.login, menu); return true; } /** * Attempts to sign in or register the account specified by the login form. * If there are form errors (invalid email, missing fields, etc.), the * errors are presented and no actual login attempt is made. */ public void attemptLogin() { if (mAuthTask != null) { return; } // Reset errors. mEmailView.setError(null); mPasswordView.setError(null); // Store values at the time of the login attempt. mEmail = mEmailView.getText().toString(); mPassword = mPasswordView.getText().toString(); boolean cancel = false; View focusView = null; // Check for a valid password. if (TextUtils.isEmpty(mPassword)) { mPasswordView.setError(getString(R.string.error_field_required)); focusView = mPasswordView; cancel = true; } // Check for a valid email address. if (TextUtils.isEmpty(mEmail)) { mEmailView.setError(getString(R.string.error_field_required)); focusView = mEmailView; cancel = true; } if (cancel) { // There was an error; don't attempt login and focus the first // form field with an error. focusView.requestFocus(); } else { // Show a progress spinner, and kick off a background task to // perform the user login attempt. mLoginStatusMessageView.setText(R.string.login_progress_signing_in); showProgress(true); mAuthTask = new UserLoginTask(); mAuthTask.execute(this); } } /** * Shows the progress UI and hides the login form. */ @TargetApi(Build.VERSION_CODES.HONEYCOMB_MR2) private void showProgress(final boolean show) { // On Honeycomb MR2 we have the ViewPropertyAnimator APIs, which allow // for very easy animations. If available, use these APIs to fade-in // the progress spinner. if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR2) { int shortAnimTime = getResources().getInteger( android.R.integer.config_shortAnimTime); mLoginStatusView.setVisibility(View.VISIBLE); mLoginStatusView.animate().setDuration(shortAnimTime) .alpha(show ? 1 : 0) .setListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator animation) { mLoginStatusView.setVisibility(show ? View.VISIBLE : View.GONE); } }); mLoginFormView.setVisibility(View.VISIBLE); mLoginFormView.animate().setDuration(shortAnimTime) .alpha(show ? 0 : 1) .setListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator animation) { mLoginFormView.setVisibility(show ? View.GONE : View.VISIBLE); } }); } else { // The ViewPropertyAnimator APIs are not available, so simply show // and hide the relevant UI components. mLoginStatusView.setVisibility(show ? View.VISIBLE : View.GONE); mLoginFormView.setVisibility(show ? View.GONE : View.VISIBLE); } } /** * Represents an asynchronous login/registration task used to authenticate * the user. */ public class UserLoginTask extends AsyncTask<Activity, Void, String> { Activity activity; @Override protected String doInBackground(Activity... activities) { activity = activities[0]; ServiceHandler sh = new ServiceHandler(); List<NameValuePair> params = new ArrayList<NameValuePair>(); params.add(new BasicNameValuePair("action", "login")); params.add(new BasicNameValuePair("username", mEmailView.getText().toString())); params.add(new BasicNameValuePair("password", mPasswordView.getText().toString())); return sh.makeServiceCall(activity, "menext", ServiceHandler.POST, params); } @Override protected void onPostExecute(final String result) { mAuthTask = null; showProgress(false); try { JSONObject jObject = new JSONObject(result); String status = jObject.getString("status"); if (status.equalsIgnoreCase("success")) { finish(); Intent intent = new Intent(activity, ListParties.class); startActivity(intent); finish(); } else { mPasswordView.setError(jObject.getJSONArray("errors").getString(0)); mPasswordView.requestFocus(); } } catch (JSONException e) { e.printStackTrace(); } } @Override protected void onCancelled() { mAuthTask = null; showProgress(false); } } }