fix #77, add a toggle for keeping the setting buttons always visible

app/src/main/kotlin/com/simplemobiletools/camera/Config.kt

@@ -73,4 +73,8 @@ class Config(context: Context) : BaseConfig(context) {
     var wasPhotoPreviewHintShown: Boolean
         get() = prefs.getBoolean(PHOTO_PREVIEW_HINT_SHOWN, false)
         set(wasPhotoPreviewHintShown) = prefs.edit().putBoolean(PHOTO_PREVIEW_HINT_SHOWN, wasPhotoPreviewHintShown).apply()
+
+    var keepSettingsVisible: Boolean
+        get() = prefs.getBoolean(KEEP_SETTINGS_VISIBLE, false)
+        set(keepSettingsVisible) = prefs.edit().putBoolean(KEEP_SETTINGS_VISIBLE, keepSettingsVisible).apply()
 }

app/src/main/kotlin/com/simplemobiletools/camera/Constants.kt

@@ -19,6 +19,7 @@ val BACK_VIDEO_RESOLUTION_INDEX = "back_video_resolution_index"
 val FRONT_PHOTO_RESOLUTION_INDEX = "front_photo_resolution_index"
 val FRONT_VIDEO_RESOLUTION_INDEX = "front_video_resolution_index"
 val PHOTO_PREVIEW_HINT_SHOWN = "photo_preview_hint_shown"
+val KEEP_SETTINGS_VISIBLE = "keep_settings_visible"
 
 val FLASH_OFF = 0
 val FLASH_ON = 1

app/src/main/kotlin/com/simplemobiletools/camera/activities/MainActivity.kt

@@ -378,7 +378,10 @@ class MainActivity : SimpleActivity(), PreviewListener, PhotoProcessor.MediaSave
         }
     }
 
-    private fun scheduleFadeOut() = mFadeHandler.postDelayed({ fadeOutButtons() }, FADE_DELAY.toLong())
+    private fun scheduleFadeOut() {
+        if (!config.keepSettingsVisible)
+            mFadeHandler.postDelayed({ fadeOutButtons() }, FADE_DELAY.toLong())
+    }
 
     private fun fadeOutButtons() {
         fadeAnim(settings, .5f)

app/src/main/kotlin/com/simplemobiletools/camera/activities/SettingsActivity.kt

@@ -31,6 +31,7 @@ class SettingsActivity : SimpleActivity() {
         setupVolumeButtonsAsShutter()
         setupTurnFlashOffAtStartup()
         setupFlipPhotos()
+        setupKeepSettingsVisible()
         updateTextColors(settings_holder)
     }
 
@@ -117,4 +118,12 @@ class SettingsActivity : SimpleActivity() {
             config.flipPhotos = settings_flip_photos.isChecked
         }
     }
+
+    private fun setupKeepSettingsVisible() {
+        settings_keep_settings_visible.isChecked = config.keepSettingsVisible
+        settings_keep_settings_visible_holder.setOnClickListener {
+            settings_keep_settings_visible.toggle()
+            config.keepSettingsVisible = settings_keep_settings_visible.isChecked
+        }
+    }
 }

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

@@ -184,5 +184,25 @@
                 android:text="@string/flip_front_camera_photos_horizontally"/>
 
         </RelativeLayout>
+
+        <RelativeLayout
+            android:id="@+id/settings_keep_settings_visible_holder"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="@dimen/medium_margin"
+            android:background="?attr/selectableItemBackground"
+            android:padding="@dimen/activity_margin">
+
+            <com.simplemobiletools.commons.views.MySwitchCompat
+                android:id="@+id/settings_keep_settings_visible"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:background="@null"
+                android:clickable="false"
+                android:paddingLeft="@dimen/medium_margin"
+                android:paddingStart="@dimen/medium_margin"
+                android:text="@string/keep_settings_visible"/>
+
+        </RelativeLayout>
     </LinearLayout>
 </ScrollView>