Fixes on drawer and back button handling

Double back to exit app
First back closes drawer
Toolbar has a back icon instead of drawer icon and drawer only opens with left to right swipe

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

@@ -8,6 +8,8 @@ import android.os.AsyncTask;
 import android.os.Bundle;
 import android.support.v7.app.AppCompatActivity;
 import android.support.v7.widget.Toolbar;
+import android.util.Log;
+import android.view.MenuItem;
 import android.view.View;
 import android.widget.Toast;
 
@@ -62,7 +64,6 @@ public class BaseActivity extends AppCompatActivity
             sessionManager = new SessionManager(client, cookieJar, sharedPrefsCookiePersistor, sharedPrefs);
             init = true;
         }
-
     }
 
     public static OkHttpClient getClient()
@@ -127,6 +128,15 @@ public class BaseActivity extends AppCompatActivity
                 })
                 .build();
         drawer.setSelection(-1);
+
+        drawer.getActionBarDrawerToggle().setDrawerIndicatorEnabled(false);
+        drawer.setOnDrawerNavigationListener(new Drawer.OnDrawerNavigationListener() {
+            @Override
+            public boolean onNavigationClickListener(View clickedView) {
+                onBackPressed();
+                return true;
+            }
+        });
     }
 
     protected void updateDrawer()

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

@@ -8,6 +8,7 @@ import android.support.v4.app.FragmentManager;
 import android.support.v4.app.FragmentPagerAdapter;
 import android.support.v4.view.ViewPager;
 import android.support.v7.widget.Toolbar;
+import android.widget.Toast;
 
 import gr.thmmy.mthmmy.R;
 import gr.thmmy.mthmmy.activities.BaseActivity;
@@ -23,6 +24,8 @@ public class MainActivity extends BaseActivity implements RecentFragment.OnListF
 
     //----------------------------------------CLASS VARIABLES-----------------------------------------
     private static final String TAG = "MainActivity";
+    private static final int TIME_INTERVAL = 2000;
+    private long mBackPressed;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -61,9 +64,21 @@ public class MainActivity extends BaseActivity implements RecentFragment.OnListF
         updateDrawer();
     }
 
-
-
-
+    @Override
+    public void onBackPressed() {
+        if(drawer.isDrawerOpen()){
+            drawer.closeDrawer();
+            return;
+        }
+        else if (mBackPressed + TIME_INTERVAL > System.currentTimeMillis()) {
+            super.onBackPressed();
+            return;
+        } else {
+            Toast.makeText(getBaseContext(), "Press back again to exit!"
+                    , Toast.LENGTH_SHORT).show();
+        }
+        mBackPressed = System.currentTimeMillis();
+    }
 
     @Override
     public void onFragmentInteraction(TopicSummary topicSummary) {

app/src/main/java/gr/thmmy/mthmmy/activities/topic/TopicActivity.java

@@ -182,6 +182,15 @@ public class TopicActivity extends BaseActivity {
         new TopicTask().execute(extras.getString("TOPIC_URL")); //Attempt data parsing
     }
 
+    @Override
+    public void onBackPressed() {
+        if (drawer.isDrawerOpen()) {
+            drawer.closeDrawer();
+            return;
+        }
+        super.onBackPressed();
+    }
+
     @Override
     protected void onDestroy() { //When finished cancel whatever request can still be canceled
         super.onDestroy();