Added login activity, made it main and launcher

app/src/main/AndroidManifest.xml

@@ -1,9 +1,9 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="gr.thmmy.mthmmy">
+          package="gr.thmmy.mthmmy">
 
-    <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.INTERNET"/>
-    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
+    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
 
     <application
         android:allowBackup="true"
@@ -12,15 +12,15 @@
         android:supportsRtl="true"
         android:theme="@style/AppTheme">
         <activity
-            android:name=".activities.MainActivity"
+            android:name=".activities.LoginActivity"
             android:configChanges="orientation|screenSize"
             android:label="@string/app_name"
             android:launchMode="singleTop"
             android:theme="@style/AppTheme.NoActionBar">
             <intent-filter>
-                <action android:name="android.intent.action.MAIN" />
+                <action android:name="android.intent.action.MAIN"/>
 
-                <category android:name="android.intent.category.LAUNCHER" />
+                <category android:name="android.intent.category.LAUNCHER"/>
             </intent-filter>
         </activity>
         <activity
@@ -28,7 +28,7 @@
             android:parentActivityName=".activities.MainActivity">
             <meta-data
                 android:name="android.support.PARENT_ACTIVITY"
-                android:value=".activities.MainActivity" />
+                android:value=".activities.MainActivity"/>
         </activity>
         <activity
             android:name=".activities.TopicActivity"
@@ -36,9 +36,11 @@
             android:parentActivityName=".activities.MainActivity">
             <meta-data
                 android:name="android.support.PARENT_ACTIVITY"
-                android:value=".activities.MainActivity" />
+                android:value=".activities.MainActivity"/>
+        </activity>
+        <activity android:name=".activities.BaseActivity"/>
+        <activity android:name=".activities.MainActivity">
         </activity>
-        <activity android:name=".activities.BaseActivity"></activity>
     </application>
 
 </manifest>

app/src/main/java/gr/thmmy/mthmmy/activities/LoginActivity.java

@@ -0,0 +1,127 @@
+package gr.thmmy.mthmmy.activities;
+
+import android.content.Intent;
+import android.os.AsyncTask;
+import android.os.Bundle;
+import android.view.View;
+import android.widget.Button;
+import android.widget.EditText;
+import android.widget.Toast;
+
+import java.util.concurrent.ExecutionException;
+
+import gr.thmmy.mthmmy.R;
+
+import static gr.thmmy.mthmmy.utils.Thmmy.CERTIFICATE_ERROR;
+import static gr.thmmy.mthmmy.utils.Thmmy.FAILED;
+import static gr.thmmy.mthmmy.utils.Thmmy.OK;
+import static gr.thmmy.mthmmy.utils.Thmmy.OTHER_ERROR;
+import static gr.thmmy.mthmmy.utils.Thmmy.WRONG_PASSWORD;
+import static gr.thmmy.mthmmy.utils.Thmmy.WRONG_USER;
+import static gr.thmmy.mthmmy.utils.Thmmy.authenticate;
+
+public class LoginActivity extends BaseActivity {
+
+    private EditText inputUsername;
+    private EditText inputPassword;
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_login);
+
+        inputUsername = (EditText) findViewById(R.id.username);
+        inputPassword = (EditText) findViewById(R.id.password);
+        Button btnLogin = (Button) findViewById(R.id.btnLogin);
+        Button btnGuest = (Button) findViewById(R.id.btnContinueAsGuest);
+
+        // Login button Click Event
+        btnLogin.setOnClickListener(new View.OnClickListener() {
+
+            public void onClick(View view) {
+                String username = inputUsername.getText().toString().trim();
+                String password = inputPassword.getText().toString().trim();
+
+                // Check for empty data in the form
+                if (!username.isEmpty() && !password.isEmpty()) {
+                    // login user
+                    try {
+                        switch(new loginAsync().execute(username,password).get()){
+                            case WRONG_USER:
+                                Toast.makeText(getApplicationContext(),
+                                        "Wrong username!", Toast.LENGTH_LONG)
+                                        .show();
+                                break;
+                            case WRONG_PASSWORD:
+                                Toast.makeText(getApplicationContext(),
+                                        "Wrong password!", Toast.LENGTH_LONG)
+                                        .show();
+                                break;
+                            case FAILED:
+                                Toast.makeText(getApplicationContext(),
+                                        "Check your connection!", Toast.LENGTH_LONG)
+                                        .show();
+                                break;
+                            case CERTIFICATE_ERROR:
+                                Toast.makeText(getApplicationContext(),
+                                        "Certificate error!", Toast.LENGTH_LONG)
+                                        .show();
+                                break;
+                            case OTHER_ERROR:
+                                Toast.makeText(getApplicationContext(),
+                                        "Check your connection!", Toast.LENGTH_LONG)
+                                        .show();
+                                break;
+                            case OK:
+                                Intent intent = new Intent(LoginActivity.this, MainActivity.class);
+                                startActivity(intent);
+                                break;
+                        }
+                        if(new loginAsync().execute(username,password).get() == OK){
+                            Intent intent = new Intent(LoginActivity.this, MainActivity.class);
+                            startActivity(intent);
+                        }
+                    } catch (InterruptedException | ExecutionException e) {
+                        e.printStackTrace();
+                    }
+                } else {
+                    // Prompt user to enter credentials
+                    Toast.makeText(getApplicationContext(),
+                            "Please enter the credentials!", Toast.LENGTH_LONG)
+                            .show();
+                }
+            }
+
+        });
+
+        // Link to Register Screen
+        btnGuest.setOnClickListener(new View.OnClickListener() {
+
+            public void onClick(View view) {
+                //TO-DO
+            }
+        });
+
+    }
+
+    private class loginAsync extends AsyncTask<String, Void, Integer> {
+
+        @Override
+        protected Integer doInBackground(String... params) {
+            return authenticate(params[0], params[1]);
+        }
+
+        @Override
+        protected void onPostExecute(Integer result) {
+        }
+
+        @Override
+        protected void onPreExecute() {
+        }
+
+        @Override
+        protected void onProgressUpdate(Void... values) {
+        }
+    }
+}
+

app/src/main/res/drawable/box_border.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle" >
+    <solid android:color="@color/transparent" />
+    <stroke android:width="1dip" android:color="#4CFF00"/>
+</shape>

app/src/main/res/layout/activity_login.xml

@@ -0,0 +1,69 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+              android:layout_width="fill_parent"
+              android:layout_height="fill_parent"
+              android:background="@color/bg_login"
+              android:gravity="center"
+              android:orientation="vertical"
+              android:padding="10dp">
+
+    <LinearLayout
+        android:layout_width="fill_parent"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:orientation="vertical"
+        android:paddingLeft="20dp"
+        android:paddingRight="20dp">
+
+        <EditText
+            android:id="@+id/username"
+            android:layout_width="fill_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginBottom="10dp"
+            android:background="@drawable/box_border"
+            android:hint="@string/hint_username"
+            android:inputType="textEmailAddress"
+            android:maxLines="1"
+            android:padding="10dp"
+            android:textColor="@color/input_login"
+            android:textColorHint="@color/input_login_hint"/>
+
+        <EditText
+            android:id="@+id/password"
+            android:layout_width="fill_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginBottom="10dp"
+            android:background="@drawable/box_border"
+            android:hint="@string/hint_password"
+            android:inputType="textPassword"
+            android:maxLines="1"
+            android:padding="10dp"
+            android:textColor="@color/input_login"
+            android:textColorHint="@color/input_login_hint"/>
+
+        <!-- Login Button -->
+
+        <Button
+            android:id="@+id/btnLogin"
+            android:layout_width="fill_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="20dip"
+            android:background="@drawable/box_border"
+            android:text="@string/btn_login"
+            android:textColor="@color/btn_login"/>
+
+        <!-- Guest Button -->
+
+        <Button
+            android:id="@+id/btnContinueAsGuest"
+            android:layout_width="fill_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="40dip"
+            android:background="@null"
+            android:text="@string/btn_continue_as_guest"
+            android:textAllCaps="false"
+            android:textColor="@color/guest_color"
+            android:textSize="15sp"/>
+    </LinearLayout>
+
+</LinearLayout>

app/src/main/res/values/colors.xml

@@ -5,6 +5,12 @@
     <color name="colorPrimaryLight">#616161</color>
     <color name="colorAccent">#2b2b2b</color>
 
+    <color name="bg_login">#000000</color>
+    <color name="input_login">#4CFF00</color>
+    <color name="input_login_hint">#4CFF00</color>
+    <color name="btn_login">#4CFF00</color>
+    <color name="guest_color">#4CFF00</color>
+
     <color name="transparent">#00000000</color>
 
     <color name="white">#ffffff</color>

app/src/main/res/values/strings.xml

@@ -3,6 +3,11 @@
     <string name="action_settings">Settings</string>
     <string name="section_format">Hello World from section: %1$d</string>
 
+    <string name="hint_username">Username</string>
+    <string name="hint_password">Password</string>
+    <string name="btn_login">LOGIN</string>
+    <string name="btn_continue_as_guest">Don\'t have an account? Continue as guest!</string>
+
     <string name="about">About</string>
     <string name="version">v%1$s</string>
     <string name="logo">logo</string>