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katana/src/main/java/org/techniche/technothlon/katana/LoginActivity.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,256 @@ | ||
| package org.techniche.technothlon.katana; | ||
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| import android.accounts.AccountManager; | ||
| import android.animation.Animator; | ||
| import android.animation.AnimatorListenerAdapter; | ||
| import android.annotation.TargetApi; | ||
| import android.app.Activity; | ||
| 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; | ||
|
|
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| /** | ||
| * Activity which displays a login screen to the user, offering registration as | ||
| * well. | ||
| */ | ||
| public class LoginActivity extends Activity { | ||
| public static final String ARG_ACCOUNT_TYPE = "accountType"; | ||
| public static final String ARG_AUTH_TYPE = "authType"; | ||
| public static final String ARG_ADDING_NEW_ACCOUNT = "newAccount"; | ||
| public static final String ARG_ACCOUNT_NAME = "accountName"; | ||
| public static final String KEY_ACCOUNT_AUTHENTICATOR_RESPONSE = "authResponse"; | ||
| public static final String KEY_ERROR_MESSAGE = "ERR_MSG"; | ||
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| public final static String PARAM_USER_PASS = "USER_PASS"; | ||
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| private final int REQ_SIGNUP = 1; | ||
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| private final String TAG = this.getClass().getSimpleName(); | ||
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| private AccountManager mAccountManager; | ||
| private String mAuthTokenType; | ||
| /** | ||
| * A dummy authentication store containing known user names and passwords. | ||
| * TODO: remove after connecting to a real authentication system. | ||
| */ | ||
| private static final String[] DUMMY_CREDENTIALS = new String[]{ | ||
| "[email protected]:hello", | ||
| "[email protected]:world" | ||
| }; | ||
|
|
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| /** | ||
| * The default email to populate the email field with. | ||
| */ | ||
| public static final String EXTRA_EMAIL = "com.example.android.authenticatordemo.extra.EMAIL"; | ||
|
|
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| /** | ||
| * Keep track of the login task to ensure we can cancel it if requested. | ||
| */ | ||
| private UserLoginTask mAuthTask = null; | ||
|
|
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| // Values for email and password at the time of the login attempt. | ||
| private String mEmail; | ||
| private String mPassword; | ||
|
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| // UI references. | ||
| private EditText mEmailView; | ||
| private EditText mPasswordView; | ||
| private View mLoginFormView; | ||
| private View mLoginStatusView; | ||
| private TextView mLoginStatusMessageView; | ||
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| @Override | ||
| protected void onCreate(Bundle savedInstanceState) { | ||
| super.onCreate(savedInstanceState); | ||
|
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| setContentView(R.layout.activity_login); | ||
|
|
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| // Set up the login form. | ||
| mEmail = getIntent().getStringExtra(EXTRA_EMAIL); | ||
| mEmailView = (EditText) findViewById(R.id.email); | ||
| mEmailView.setText(mEmail); | ||
|
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| 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; | ||
| } | ||
| }); | ||
|
|
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| mLoginFormView = findViewById(R.id.login_form); | ||
| mLoginStatusView = findViewById(R.id.login_status); | ||
| mLoginStatusMessageView = (TextView) findViewById(R.id.login_status_message); | ||
|
|
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| findViewById(R.id.sign_in_button).setOnClickListener(new View.OnClickListener() { | ||
| @Override | ||
| public void onClick(View view) { | ||
| attemptLogin(); | ||
| } | ||
| }); | ||
| } | ||
|
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|
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| @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); | ||
|
|
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| // Store values at the time of the login attempt. | ||
| mEmail = mEmailView.getText().toString(); | ||
| mPassword = mPasswordView.getText().toString(); | ||
|
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| boolean cancel = false; | ||
| View focusView = null; | ||
|
|
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| // 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; | ||
| } | ||
|
|
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| // Check for a valid email address. | ||
| if (TextUtils.isEmpty(mEmail)) { | ||
| mEmailView.setError(getString(R.string.error_field_required)); | ||
| focusView = mEmailView; | ||
| cancel = true; | ||
| } else if (!mEmail.contains("@")) { | ||
| mEmailView.setError(getString(R.string.error_invalid_email)); | ||
| focusView = mEmailView; | ||
| cancel = true; | ||
| } | ||
|
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| 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((Void) null); | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * 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); | ||
|
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| 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); | ||
| } | ||
| }); | ||
|
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| 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<Void, Void, Boolean> { | ||
| @Override | ||
| protected Boolean doInBackground(Void... params) { | ||
| // TODO: attempt authentication against a network service. | ||
|
|
||
| try { | ||
| // Simulate network access. | ||
| Thread.sleep(2000); | ||
| } catch (InterruptedException e) { | ||
| return false; | ||
| } | ||
|
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| for (String credential : DUMMY_CREDENTIALS) { | ||
| String[] pieces = credential.split(":"); | ||
| if (pieces[0].equals(mEmail)) { | ||
| // Account exists, return true if the password matches. | ||
| return pieces[1].equals(mPassword); | ||
| } | ||
| } | ||
|
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| // TODO: register the new account here. | ||
| return true; | ||
| } | ||
|
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| @Override | ||
| protected void onPostExecute(final Boolean success) { | ||
| mAuthTask = null; | ||
| showProgress(false); | ||
|
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| if (success) { | ||
| finish(); | ||
| } else { | ||
| mPasswordView.setError(getString(R.string.error_incorrect_password)); | ||
| mPasswordView.requestFocus(); | ||
| } | ||
| } | ||
|
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||
| @Override | ||
| protected void onCancelled() { | ||
| mAuthTask = null; | ||
| showProgress(false); | ||
| } | ||
| } | ||
| } |
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