Android Open Source - swazam Login Activity

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License

The source code is released under:
MIT License
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Java Source Code

package at.saws2013.szazam;
/*ww  w  .j  av a2 s.  c om*/
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import org.json.JSONException;
import org.json.JSONObject;

import com.android.volley.AuthFailureError;
import com.android.volley.Request.Method;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.annotation.TargetApi;
import android.app.Activity;
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.support.v4.app.NavUtils;
import android.text.TextUtils;
import android.util.Log;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.inputmethod.EditorInfo;
import android.widget.EditText;
import android.widget.TextView;
import at.saws2013.szazam.store.impl.AuthStore;
import at.saws2013.szazam.volley.CustomVolleyStringRequest;

/**
 * Activity which displays a login screen to the user, offering registration as
 * well.
 */
public class LoginActivity extends Activity {
  
  private final static String TAG = "LoginActivity";
  
  private App app;

  /**
   * Keep track of the login request to ensure we can cancel it if requested.
   */
  private CustomVolleyStringRequest mAuthRequest = null;
  
  // TODO change this with real host address
  private final static String LOGIN_URL = "/authenticate";

  // Values for username and password at the time of the login attempt.
  private String mUsername;
  private String mPassword;

  // UI references.
  private EditText mUsernameView;
  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);
    
    app = (App) getApplication();

    // Set up the login form.
    mUsernameView = (EditText) findViewById(R.id.username);
    mUsernameView.setText(mUsername);

    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;
  }
  
  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    Intent i;
    switch (item.getItemId()) {
    case android.R.id.home:
      // This ID represents the Home or Up button. In the case of this
      // activity, the Up button is shown. Use NavUtils to allow users
      // to navigate up one level in the application structure. For
      // more details, see the Navigation pattern on Android Design:
      //
      // http://developer.android.com/design/patterns/navigation.html#up-vs-back
      //
      NavUtils.navigateUpFromSameTask(this);
      return true;
    case R.id.action_settings:
      i = new Intent(LoginActivity.this, SettingsActivity.class);
      startActivity(i);
      return true;
    }
    return super.onOptionsItemSelected(item);
  }

  /**
   * 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 (mAuthRequest != null) {
      return;
    }

    // Reset errors.
    mUsernameView.setError(null);
    mPasswordView.setError(null);

    // Store values at the time of the login attempt.
    mUsername = mUsernameView.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;
    } else if (mPassword.length() < 4) {
      mPasswordView.setError(getString(R.string.error_invalid_password));
      focusView = mPasswordView;
      cancel = true;
    }

    // Check for a valid email address.
    if (TextUtils.isEmpty(mUsername)) {
      mUsernameView.setError(getString(R.string.error_field_required));
      focusView = mUsernameView;
      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);
      loginOnServer();
    }
  }
  
  private void loginOnServer(){
    Map<String, String> params = new HashMap<String, String>(2);
    params.put("username", mUsername);
    params.put("password", mPassword);
    mAuthRequest = new CustomVolleyStringRequest(Method.POST, app.getHostFromSettings()+LOGIN_URL,  
        new Response.Listener<String>() {

          @Override
          public void onResponse(String response) {
            Log.d(TAG, response.toString());
            JSONObject responseJson;
            try {
              responseJson = new JSONObject(response);String token = responseJson.optString("token");
              if (!TextUtils.isEmpty(token)){
                AuthStore.getInstance(getApplicationContext()).setToken(responseJson.optString("token"));
                Intent i = new Intent(LoginActivity.this, RecognitionActivity.class);
                startActivity(i);
                finish();
              } else {
                mPasswordView.setError(getString(R.string.error_incorrect_password));
              }
            } catch (JSONException e) {
              e.printStackTrace();
            }
            
          }
        }, new Response.ErrorListener() {

          @Override
          public void onErrorResponse(VolleyError error) {
            showProgress(false);
            Log.d(TAG, "login failed");
            try {
              Log.d(TAG, error.getMessage());
              Log.d(TAG, "status code: " + error.networkResponse.statusCode);
            } catch (NullPointerException e) {
              // TODO: handle exception
            }
            mUsernameView.setError(getString(R.string.error_incorrect_username));
            mPasswordView.setError(getString(R.string.error_incorrect_password));
            mAuthRequest = null;
            // uncomment for debugging
            //AuthStore.getInstance(getApplicationContext()).setToken("sfkjh");
            //Intent i = new Intent(LoginActivity.this, RecognitionActivity.class);
            //startActivity(i);
            //finish();
          }
        }, params);
    mAuthRequest.setTag(LoginActivity.class.getName());
    try {
      Map<String, String> headers = mAuthRequest.getHeaders();
      for (Entry<String, String> header : headers.entrySet()) {
        Log.d(TAG, header.getKey() + " -> " + header.getValue());
      }
    } catch (AuthFailureError e) {
      e.printStackTrace();
    }
    app.getVolleyQueue().add(mAuthRequest);
  }
  
  @Override
  protected void onPause() {
    super.onPause();
    app.getVolleyQueue().cancelAll(LoginActivity.class.getName());
  }

  /**
   * 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);
    }
  }
}
Java Source Code List
