mailiverse/android/Mailiverse/src/com/benith/mailiverse/LoginActivity.java

package com.benith.mailiverse;

import core.constants.ConstantsClient;
import core.util.Environment;
import key.auth.KeyServerAuthenticatorSync;
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.annotation.TargetApi;
import android.app.Activity;
import android.content.Context;
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.WindowManager;
import android.view.animation.AccelerateInterpolator;
import android.view.animation.Animation;
import android.view.animation.LinearInterpolator;
import android.view.animation.RotateAnimation;
import android.view.inputmethod.EditorInfo;
import android.widget.AbsoluteLayout;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.RelativeLayout;
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_NAME = "com.benith.mailiverse.NAME";

	/**
	 * Keep track of the login task to ensure we can cancel it if requested.
	 */
	private UserLoginTask mAuthTask = null;

	protected Application application;
	
	// Values for email and password at the time of the login attempt.
	private String mName;
	private String mPassword;

	// UI references.
	private EditText mNameView;
	private EditText mPasswordView;
	private View mLoginFormView;
	private View mLoginStatusView;
	private TextView mLoginStatusMessageView;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);

		application = Application.getInstance();
		setContentView(R.layout.activity_login);

		// Set up the login form.
		mName = getIntent().getStringExtra(EXTRA_NAME);
		mNameView = (EditText) findViewById(R.id.email);
		mNameView.setText(mName);

		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();
					}
				});
	
//		makeBackgroundRotateForever();
	}

	public void makeBackgroundRotateForever ()
	{
		AbsoluteLayout backgroundContainer = (AbsoluteLayout) findViewById(R.id.login_background);

		ImageView background = new ImageView(this);
		background.setImageResource(R.drawable.spiral_galaxy_bg);
		
		WindowManager manager = (WindowManager)getSystemService(Context.WINDOW_SERVICE);
		int width = manager.getDefaultDisplay().getWidth();
		
		AbsoluteLayout.LayoutParams params = new AbsoluteLayout.LayoutParams(
			width*2, width*2, 0, 0
//			backgroundContainer.getWidth() * 2, backgroundContainer.getHeight() * 2
		);
		
		backgroundContainer.addView(background, params);
		
		
		Animation rotateAnim = new RotateAnimation(
			0, 360, 
			Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f
		);
		rotateAnim.setDuration(80000);
		
		rotateAnim.setRepeatCount(Animation.INFINITE);
		rotateAnim.setInterpolator(new LinearInterpolator());
		background.startAnimation(rotateAnim);
	}
	
	@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.
		mNameView.setError(null);
		mPasswordView.setError(null);

		// Store values at the time of the login attempt.
		mName = mNameView.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(mName)) {
			mNameView.setError(getString(R.string.error_field_required));
			focusView = mNameView;
			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(mName, mPassword);
		}
	}

	/**
	 * 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<String, Void, Environment> {
		@Override
		protected Environment doInBackground(String... params) 
		{
			try 
			{
				String name = params[0];
				String password = params[1];
				
				KeyServerAuthenticatorSync auth = new KeyServerAuthenticatorSync();
				return auth.get(name + ConstantsClient.ATHOST, password, null);
			} 
			catch (Exception e) 
			{
				return null;
			}

		}

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

			if (success != null) {
				application.state.name = mName;
				application.state.environment = success;
				
				Intent intent = new Intent(LoginActivity.this, MainActivity.class);
				startActivity(intent);
				
				finish();
			} else {
				mPasswordView
						.setError(getString(R.string.error_incorrect_password));
				mPasswordView.requestFocus();
			}
		}

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