add a setting for displaying Stroboscope button

app/src/main/java/com/simplemobiletools/flashlight/Config.java

@@ -10,7 +10,7 @@ public class Config {
         return new Config(context);
     }
 
-    public Config(Context context) {
+    private Config(Context context) {
         mPrefs = context.getSharedPreferences(Constants.PREFS_KEY, Context.MODE_PRIVATE);
     }
 
@@ -37,4 +37,12 @@ public class Config {
     public void setBrightDisplay(boolean brightDisplay) {
         mPrefs.edit().putBoolean(Constants.BRIGHT_DISPLAY, brightDisplay).apply();
     }
+
+    public boolean getStroboscope() {
+        return mPrefs.getBoolean(Constants.STROBOSCOPE, true);
+    }
+
+    public void setStroboscope(boolean stroboscope) {
+        mPrefs.edit().putBoolean(Constants.STROBOSCOPE, stroboscope).apply();
+    }
 }

app/src/main/java/com/simplemobiletools/flashlight/Constants.java

@@ -6,5 +6,6 @@ public class Constants {
     public static final String IS_FIRST_RUN = "is_first_run";
     public static final String IS_DARK_THEME = "is_dark_theme";
     public static final String BRIGHT_DISPLAY = "bright_display";
+    public static final String STROBOSCOPE = "stroboscope";
     public static final String WIDGET_COLOR = "widget_color";
 }

app/src/main/java/com/simplemobiletools/flashlight/activities/SettingsActivity.java

@@ -14,6 +14,7 @@ import butterknife.OnClick;
 public class SettingsActivity extends SimpleActivity {
     @BindView(R.id.settings_dark_theme) SwitchCompat mDarkThemeSwitch;
     @BindView(R.id.settings_bright_display) SwitchCompat mBrightDisplaySwitch;
+    @BindView(R.id.settings_stroboscope) SwitchCompat mStroboscopeSwitch;
 
     private static Config mConfig;
 
@@ -26,6 +27,7 @@ public class SettingsActivity extends SimpleActivity {
 
         setupDarkTheme();
         setupBrightDisplay();
+        setupStroboscope();
     }
 
     private void setupDarkTheme() {
@@ -36,6 +38,10 @@ public class SettingsActivity extends SimpleActivity {
         mBrightDisplaySwitch.setChecked(mConfig.getBrightDisplay());
     }
 
+    private void setupStroboscope() {
+        mStroboscopeSwitch.setChecked(mConfig.getStroboscope());
+    }
+
     @OnClick(R.id.settings_dark_theme_holder)
     public void handleDarkTheme() {
         mDarkThemeSwitch.setChecked(!mDarkThemeSwitch.isChecked());
@@ -49,6 +55,12 @@ public class SettingsActivity extends SimpleActivity {
         mConfig.setBrightDisplay(mBrightDisplaySwitch.isChecked());
     }
 
+    @OnClick(R.id.settings_stroboscope_holder)
+    public void handleStroboscope() {
+        mStroboscopeSwitch.setChecked(!mStroboscopeSwitch.isChecked());
+        mConfig.setStroboscope(mStroboscopeSwitch.isChecked());
+    }
+
     private void restartActivity() {
         TaskStackBuilder.create(getApplicationContext()).addNextIntentWithParentStack(getIntent()).startActivities();
     }

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

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <ScrollView
-    android:id="@+id/settings_scrollview"
     xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/settings_scrollview"
     android:layout_width="match_parent"
     android:layout_height="wrap_content">
 
@@ -62,5 +62,31 @@
                 android:clickable="false"/>
 
         </RelativeLayout>
+
+        <RelativeLayout
+            android:id="@+id/settings_stroboscope_holder"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="@dimen/settings_padding"
+            android:background="?attr/selectableItemBackground"
+            android:padding="@dimen/activity_margin">
+
+            <TextView
+                android:id="@+id/settings_stroboscope_label"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_centerVertical="true"
+                android:paddingLeft="@dimen/settings_padding"
+                android:text="@string/stroboscope"/>
+
+            <android.support.v7.widget.SwitchCompat
+                android:id="@+id/settings_stroboscope"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_alignParentRight="true"
+                android:background="@null"
+                android:clickable="false"/>
+
+        </RelativeLayout>
     </LinearLayout>
 </ScrollView>

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

@@ -8,6 +8,7 @@
     <string name="settings">Einstellungen</string>
     <string name="dark_theme">Dunkles Thema</string>
     <string name="bright_display">Zeige Knopf für helles Display</string>
+    <string name="stroboscope">Show a stroboscope button</string>
 
     <!-- About -->
     <string name="about">Über</string>

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

@@ -8,6 +8,7 @@
     <string name="settings">Impostazioni</string>
     <string name="dark_theme">Tema scuro</string>
     <string name="bright_display">Mostra un pulsante per schermo luminoso</string>
+    <string name="stroboscope">Show a stroboscope button</string>
 
     <!-- About -->
     <string name="about">Informazioni</string>

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

@@ -8,6 +8,7 @@
     <string name="settings">設定</string>
     <string name="dark_theme">ダークテーマ</string>
     <string name="bright_display">Show a bright display button</string>
+    <string name="stroboscope">Show a stroboscope button</string>
 
     <!-- About -->
     <string name="about">アプリについて</string>

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

@@ -8,6 +8,7 @@
     <string name="settings">Inställningar</string>
     <string name="dark_theme">Mörkt tema</string>
     <string name="bright_display">Show a bright display button</string>
+    <string name="stroboscope">Show a stroboscope button</string>
 
     <!-- About -->
     <string name="about">Om</string>

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

@@ -8,6 +8,7 @@
     <string name="settings">Settings</string>
     <string name="dark_theme">Dark theme</string>
     <string name="bright_display">Show a bright display button</string>
+    <string name="stroboscope">Show a stroboscope button</string>
 
     <!-- About -->
     <string name="about">About</string>