templates/activities/LoginActivity/root/src/app_package/LoginActivity.java.ftl - platform/sdk - Git at Google

 package ${packageName};

 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;
 <#if parentActivityClass != "">
 import android.view.MenuItem;
 import android.support.v4.app.NavUtils;
 </#if>

 /**
  * Activity which displays a login screen to the user, offering registration as
  * well.
  */
 public class ${activityClass} extends Activity {
     /**
      * 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[]{
             "foo@example.com:hello",
             "bar@example.com:world"
     };

     /**
      * 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.${layoutName});
         <#if parentActivityClass != "">
         setupActionBar();
         </#if>

         // Set up the login form.
         mEmail = getIntent().getStringExtra(EXTRA_EMAIL);
         mEmailView = (EditText) findViewById(R.id.email);
         mEmailView.setText(mEmail);

         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();
             }
         });
     }

     <#if parentActivityClass != "">
     /**
      * Set up the {@link android.app.ActionBar}, if the API is available.
      */
     @TargetApi(Build.VERSION_CODES.HONEYCOMB)
     private void setupActionBar() {
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
             // Show the Up button in the action bar.
             getActionBar().setDisplayHomeAsUpEnabled(true);
         }
     }

     @Override
     public boolean onOptionsItemSelected(MenuItem item) {
         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
                 //
                 // TODO: If Settings has multiple levels, Up should navigate up
                 // that hierarchy.
                 NavUtils.navigateUpFromSameTask(this);
                 return true;
         }
         return super.onOptionsItemSelected(item);
     }
     </#if>

     @Override
     public boolean onCreateOptionsMenu(Menu menu) {
         super.onCreateOptionsMenu(menu);
         getMenuInflater().inflate(R.menu.${menuName}, 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;
         } 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(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;
         }

         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);

             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<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;
             }

             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);
                 }
             }

             // TODO: register the new account here.
             return true;
         }

         @Override
         protected void onPostExecute(final Boolean success) {
             mAuthTask = null;
             showProgress(false);

             if (success) {
                 finish();
             } else {
                 mPasswordView.setError(getString(R.string.error_incorrect_password));
                 mPasswordView.requestFocus();
             }
         }

         @Override
         protected void onCancelled() {
             mAuthTask = null;
             showProgress(false);
         }
     }
 }
	package ${packageName};

	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;
	<#if parentActivityClass != "">
	import android.view.MenuItem;
	import android.support.v4.app.NavUtils;
	</#if>

	/**
	* Activity which displays a login screen to the user, offering registration as
	* well.
	*/
	public class ${activityClass} extends Activity {
	/**
	* 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[]{
	"foo@example.com:hello",
	"bar@example.com:world"
	};

	/**
	* 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.${layoutName});
	<#if parentActivityClass != "">
	setupActionBar();
	</#if>

	// Set up the login form.
	mEmail = getIntent().getStringExtra(EXTRA_EMAIL);
	mEmailView = (EditText) findViewById(R.id.email);
	mEmailView.setText(mEmail);

	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();
	}
	});
	}

	<#if parentActivityClass != "">
	/**
	* Set up the {@link android.app.ActionBar}, if the API is available.
	*/
	@TargetApi(Build.VERSION_CODES.HONEYCOMB)
	private void setupActionBar() {
	if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
	// Show the Up button in the action bar.
	getActionBar().setDisplayHomeAsUpEnabled(true);
	}
	}

	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
	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
	//
	// TODO: If Settings has multiple levels, Up should navigate up
	// that hierarchy.
	NavUtils.navigateUpFromSameTask(this);
	return true;
	}
	return super.onOptionsItemSelected(item);
	}
	</#if>

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
	super.onCreateOptionsMenu(menu);
	getMenuInflater().inflate(R.menu.${menuName}, 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;
	} 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(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;
	}

	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);

	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<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;
	}

	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);
	}
	}

	// TODO: register the new account here.
	return true;
	}

	@Override
	protected void onPostExecute(final Boolean success) {
	mAuthTask = null;
	showProgress(false);

	if (success) {
	finish();
	} else {
	mPasswordView.setError(getString(R.string.error_incorrect_password));
	mPasswordView.requestFocus();
	}
	}

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