Fix minor problems (#1082)

- Crash in MainActivity when pressing the back button
- Rainbow logo was not shown even if logo was enabled

app/src/main/java/de/tum/in/tumcampusapp/component/other/navigation/NavigationManager.kt

@@ -123,7 +123,7 @@ object NavigationManager {
     fun onBackPressed(current: Activity): Boolean {
         val isTopLevel = current::class.java in topLevelActivities
         val showDrawer = current.intent.extras?.getBoolean(Const.SHOW_DRAWER) ?: false
-        val parentName = current.parentActivityIntent.component.className
+        val parentName = current.parentActivityIntent?.component?.className
 
         if (isTopLevel && showDrawer && parentName == MainActivity::class.java.name) {
             val intent = Intent(current, MainActivity::class.java).apply {

app/src/main/java/de/tum/in/tumcampusapp/component/ui/onboarding/StartupActivity.java

@@ -78,15 +78,16 @@ private void initEasterEgg() {
 
                 // use the other logo and invert the setting
                 boolean rainbowEnabled = Utils.getSettingBool(this, Const.RAINBOW_MODE, false);
+                rainbowEnabled = !rainbowEnabled;
                 ImageView tumLogo = findViewById(R.id.startupTumLogo);
 
                 if (rainbowEnabled) {
-                    tumLogo.setImageResource(R.drawable.tum_logo);
-                } else {
                     tumLogo.setImageResource(R.drawable.tum_logo_rainbow);
+                } else {
+                    tumLogo.setImageResource(R.drawable.tum_logo_blue);
                 }
 
-                Utils.setSetting(this, Const.RAINBOW_MODE, !rainbowEnabled);
+                Utils.setSetting(this, Const.RAINBOW_MODE, rainbowEnabled);
             }
         });
         background.setSoundEffectsEnabled(false);

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

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="125dp"
+        android:height="66dp"
+        android:viewportHeight="66.561005"
+        android:viewportWidth="125.95499">
+    <path
+        android:fillColor="@color/tum_blue"
+        android:pathData="M87.48,66.55l12.44,0l0,-54.03l13.59,0l0,54.03l12.44,0l0,-66.55l-63.84,0l0,54.45l-13.67,0l0,-54.37l-48.44,0l0,11.78l11.29,0l0,54.7l11.86,0l0,-54.62l13.17,0l0,54.62l37.73,0l0,-54.04l13.42,0z"/>
+</vector>

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

@@ -1,5 +1,6 @@
 <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
     android:id="@+id/container"
     android:layout_width="match_parent"
     android:layout_height="match_parent">
@@ -10,8 +11,8 @@
         android:layout_height="120dp"
         android:layout_centerInParent="true"
         android:layout_marginStart="@dimen/material_default_padding"
-        android:src="@drawable/tum_logo"
-        android:tint="@color/tum_blue"
+        android:layout_marginEnd="@dimen/material_default_padding"
+        android:src="@drawable/tum_logo_blue"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
@@ -34,7 +35,7 @@
     <TextView
         android:id="@+id/startupLoading"
         android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
+        android:layout_height="19dp"
         android:layout_below="@id/startupTumMotto"
         android:layout_centerHorizontal="true"
         android:layout_marginTop="@dimen/material_default_padding"