LoginActivity.java

package io.evercam.connect.signin;

import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.annotation.TargetApi;
import android.app.ActionBar;
import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.AsyncTask;
import android.os.Build;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.text.SpannableString;
import android.text.TextUtils;
import android.text.style.UnderlineSpan;
import android.view.Gravity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

import io.evercam.API;
import io.evercam.ApiKeyPair;
import io.evercam.EvercamException;
import io.evercam.User;
import io.evercam.connect.EvercamDiscover;
import io.evercam.connect.R;
import io.evercam.connect.helper.Constants;
import io.evercam.connect.helper.SharedPrefsManager;

public class LoginActivity extends Activity
{
    private final String TAG = "LoginActivity";
    private View loginFormView;
    private View loginStatusView;
    private EditText usernameEdit;
    private EditText passwordEdit;
    private String username;
    private String password;
    LinearLayout loginLayout;
    LinearLayout confirmLayout;
    private UserLoginTask loginTask = null;
    private SharedPreferences sharedPrefs;

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);

        sharedPrefs = PreferenceManager.getDefaultSharedPreferences(LoginActivity.this);
        SharedPrefsManager.clearAllUserInfo(sharedPrefs);

        EvercamDiscover.sendScreenAnalytics(this, getString(R.string.screen_login));

        ActionBar actionBar = getActionBar();
        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
        actionBar.setDisplayHomeAsUpEnabled(true);

        loginLayout = (LinearLayout) findViewById(R.id.login_layout);
        confirmLayout = (LinearLayout) findViewById(R.id.confirm_layout);

        loginFormView = findViewById(R.id.login_form_relativelayout);
        loginStatusView = findViewById(R.id.login_status);

        usernameEdit = (EditText) findViewById(R.id.loginUsername);
        passwordEdit = (EditText) findViewById(R.id.loginPassword);

        Button btnEvercamSignIn = (Button) findViewById(R.id.signInEvercamBtn);
        TextView signUpLink = (TextView) findViewById(R.id.signupLink);
        SpannableString spanString = new SpannableString(this.getResources().getString(R.string.create_account));
        spanString.setSpan(new UnderlineSpan(), 0, spanString.length(), 0);
        signUpLink.setText(spanString);

        signUpLink.setOnClickListener(new OnClickListener()
        {

            @Override
            public void onClick(View v)
            {
                Intent signUpIntent = new Intent(LoginActivity.this, SignUpActivity.class);
                startActivityForResult(signUpIntent, Constants.REQUEST_CODE_SIGN_UP);
            }
        });

        btnEvercamSignIn.setOnClickListener(new OnClickListener()
        {

            @Override
            public void onClick(View v)
            {
                attemptLogin();
            }
        });
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data)
    {
        if(requestCode == Constants.REQUEST_CODE_SIGN_UP)
        {
            if(resultCode == Constants.RESULT_TRUE)
            {
                setResult(Constants.RESULT_TRUE);
                finish();
            }
        }
    }

    public void attemptLogin()
    {
        if(loginTask != null)
        {
            return;
        }

        usernameEdit.setError(null);
        passwordEdit.setError(null);

        username = usernameEdit.getText().toString();
        password = passwordEdit.getText().toString();

        boolean cancel = false;
        View focusView = null;

        if(TextUtils.isEmpty(password))
        {
            passwordEdit.setError(getString(R.string.error_field_required));
            focusView = passwordEdit;
            cancel = true;
        }
        else if(password.contains(" "))
        {
            passwordEdit.setError(getString(R.string.error_invalid_password));
            focusView = passwordEdit;
            cancel = true;
        }

        if(TextUtils.isEmpty(username))
        {
            usernameEdit.setError(getString(R.string.error_field_required));
            focusView = usernameEdit;
            cancel = true;
        }
        else if(username.contains(" "))
        {
            usernameEdit.setError(getString(R.string.error_invalid_username));
            focusView = usernameEdit;
            cancel = true;
        }

        if(cancel)
        {
            focusView.requestFocus();
        }
        else
        {
            showProgress(true);
            loginTask = new UserLoginTask();
            loginTask.execute((Void) null);
        }
    }

    @TargetApi(Build.VERSION_CODES.HONEYCOMB_MR2)
    private void showProgress(final boolean show)
    {
        if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR2)
        {
            int shortAnimTime = getResources().getInteger(android.R.integer.config_shortAnimTime);

            loginStatusView.setVisibility(View.VISIBLE);
            loginStatusView.animate().setDuration(shortAnimTime).alpha(show ? 1 : 0).setListener
					(new AnimatorListenerAdapter()
            {
                @Override
                public void onAnimationEnd(Animator animation)
                {
                    loginStatusView.setVisibility(show ? View.VISIBLE : View.GONE);
                }
            });

            loginFormView.setVisibility(View.VISIBLE);
            loginFormView.animate().setDuration(shortAnimTime).alpha(show ? 0 : 1).setListener
					(new AnimatorListenerAdapter()
            {
                @Override
                public void onAnimationEnd(Animator animation)
                {
                    loginFormView.setVisibility(show ? View.GONE : View.VISIBLE);
                }
            });
        }
        else
        {
            loginStatusView.setVisibility(show ? View.VISIBLE : View.GONE);
            loginFormView.setVisibility(show ? View.GONE : View.VISIBLE);
        }
    }

    @Override
    public Intent getParentActivityIntent()
    {
        this.finish();
        return super.getParentActivityIntent();

    }

    public class UserLoginTask extends AsyncTask<Void, Void, Boolean>
    {
        String errorMessage = "Error";

        @Override
        protected Boolean doInBackground(Void... params)
        {
            try
            {
                ApiKeyPair userKeyPair = API.requestUserKeyPairFromEvercam(username, password);
                String userApiKey = userKeyPair.getApiKey();
                String userApiId = userKeyPair.getApiId();
                SharedPrefsManager.saveEvercamUserKeyPair(sharedPrefs, userApiKey, userApiId);
                API.setUserKeyPair(userApiKey, userApiId);
                User evercamUser = new User(username);
                SharedPrefsManager.saveEvercamCredential(sharedPrefs, evercamUser, password);
                return true;
            }
            catch(EvercamException e)
            {
                errorMessage = e.getMessage();
            }
            return false;
        }

        @Override
        protected void onPostExecute(final Boolean success)
        {
            loginTask = null;

            if(success)
            {
                setResult(Constants.RESULT_TRUE);
                finish();
            }
            else
            {
                showProgress(false);
                Toast toast = Toast.makeText(getApplicationContext(), errorMessage, Toast.LENGTH_SHORT);
                toast.setGravity(Gravity.CENTER, 0, 0);
                toast.show();
                passwordEdit.setText(null);
            }
        }

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

    public static boolean isUserLogged(SharedPreferences sharedPrefs)
    {
        String savedUsername = sharedPrefs.getString(Constants.EVERCAM_USERNAME, null);
        if(savedUsername != null)
        {
            return true;
        }
        return false;
    }
}