Added switch for Dark Theme

app/src/main/java/org/itxtech/daedalus/Daedalus.java

@@ -190,7 +190,7 @@ public class Daedalus extends Application {
     }
 
     public static boolean isDarkTheme() {
-        return false;
+        return getInstance().prefs.getBoolean("settings_dark_theme", false);
     }
 
     @Override

app/src/main/java/org/itxtech/daedalus/activity/ConfigActivity.java

@@ -56,7 +56,7 @@ public class ConfigActivity extends AppCompatActivity {
                 break;
         }
 
-        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar_config);
+        Toolbar toolbar = findViewById(R.id.toolbar_config);
         Drawable drawable = ContextCompat.getDrawable(this, R.drawable.ic_clear);
         Drawable wrappedDrawable = DrawableCompat.wrap(drawable);
         DrawableCompat.setTint(wrappedDrawable, Color.WHITE);

app/src/main/java/org/itxtech/daedalus/activity/MainActivity.java

@@ -58,6 +58,8 @@ public class MainActivity extends AppCompatActivity implements NavigationView.On
     public static final int FRAGMENT_DNS_SERVERS = 5;
     public static final int FRAGMENT_LOG = 6;
 
+    public static final String LAUNCH_NEED_RECREATE = "org.itxtech.daedalus.activity.MainActivity.LAUNCH_NEED_RECREATE";
+
     private static MainActivity instance = null;
 
     private ToolbarFragment currentFragment;
@@ -92,7 +94,6 @@ public class MainActivity extends AppCompatActivity implements NavigationView.On
         ((TextView) navigationView.getHeaderView(0).findViewById(R.id.textView_nav_git_commit)).setText(getString(R.string.nav_git_commit) + " " + BuildConfig.GIT_COMMIT);
 
         updateUserInterface(getIntent());
-        Log.d(TAG, "onCreate");
     }
 
     private void switchFragment(Class fragmentClass) {
@@ -123,8 +124,6 @@ public class MainActivity extends AppCompatActivity implements NavigationView.On
     @Override
     protected void onDestroy() {
         super.onDestroy();
-
-        Log.d(TAG, "onDestroy");
         instance = null;
         currentFragment = null;
     }
@@ -208,6 +207,19 @@ public class MainActivity extends AppCompatActivity implements NavigationView.On
         }
 
         int fragment = intent.getIntExtra(LAUNCH_FRAGMENT, FRAGMENT_NONE);
+
+        if (intent.getBooleanExtra(LAUNCH_NEED_RECREATE, false)) {
+            finish();
+            overridePendingTransition(R.anim.start, R.anim.end);
+            if (fragment != FRAGMENT_NONE) {
+                startActivity(new Intent(this, MainActivity.class)
+                        .putExtra(LAUNCH_FRAGMENT, fragment));
+            } else {
+                startActivity(new Intent(this, MainActivity.class));
+            }
+            return;
+        }
+
         switch (fragment) {
             case FRAGMENT_ABOUT:
                 switchFragment(AboutFragment.class);

app/src/main/java/org/itxtech/daedalus/fragment/GlobalConfigFragment.java

@@ -1,5 +1,6 @@
 package org.itxtech.daedalus.fragment;
 
+import android.content.Intent;
 import android.os.Build;
 import android.os.Bundle;
 import android.preference.*;
@@ -7,6 +8,7 @@ import android.support.design.widget.Snackbar;
 import android.view.View;
 import org.itxtech.daedalus.Daedalus;
 import org.itxtech.daedalus.R;
+import org.itxtech.daedalus.activity.MainActivity;
 import org.itxtech.daedalus.util.server.DNSServerHelper;
 
 /**
@@ -81,6 +83,17 @@ public class GlobalConfigFragment extends PreferenceFragment {
             }
         });
 
+        SwitchPreference darkTheme = (SwitchPreference) findPreference("settings_dark_theme");
+        darkTheme.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
+            @Override
+            public boolean onPreferenceChange(Preference preference, Object o) {
+                getActivity().startActivity(new Intent(Daedalus.getInstance(), MainActivity.class)
+                        .putExtra(MainActivity.LAUNCH_FRAGMENT, MainActivity.FRAGMENT_SETTINGS)
+                        .putExtra(MainActivity.LAUNCH_NEED_RECREATE, true));
+                return true;
+            }
+        });
+
         if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
             SwitchPreference advanced = (SwitchPreference) findPreference("settings_advanced_switch");
             advanced.setEnabled(false);

app/src/main/res/anim/end.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<set xmlns:android="http://schemas.android.com/apk/res/android">
+    <alpha
+            android:duration="300"
+            android:fromAlpha="1.0"
+            android:toAlpha="0.0"/>
+</set>

app/src/main/res/anim/start.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<set xmlns:android="http://schemas.android.com/apk/res/android">
+    <alpha
+            android:duration="300"
+            android:fromAlpha="0.0"
+            android:toAlpha="1.0"/>
+</set>

app/src/main/res/values-zh-rCN/strings.xml

@@ -86,4 +86,5 @@
     <string name="notice_check_dynamic_rule_reload">请在设置中勾选“允许动态更新规则”</string>
     <string name="notice_export_complete">导出完成。</string>
     <string name="notice_importing_rule">正在导入规则，请稍等。</string>
+    <string name="settings_dark_theme">使用暗主题</string>
 </resources>

app/src/main/res/values-zh-rTW/strings.xml

@@ -86,4 +86,5 @@
     <string name="notice_check_dynamic_rule_reload">請在設定中開啟「允許動態規則重新載入」</string>
     <string name="notice_export_complete">导出完成。 TODO</string>
     <string name="notice_importing_rule">正在导入规则，请稍等。 TODO</string>
+    <string name="settings_dark_theme">使用暗主题</string>
 </resources>

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

@@ -64,6 +64,7 @@
     <string name="settings_manual_summary">Visit GitHub wiki page.</string>
     <string name="settings_allow_dynamic_rule_reload">Allow dynamic rule reload</string>
     <string name="settings_debug_output">Debug output</string>
+    <string name="settings_dark_theme">Use Dark Theme</string>
 
     <string name="settings_rule_name">Rule Name</string>
     <string name="settings_rule_type">Rule Type</string>

app/src/main/res/xml/perf_settings.xml

@@ -35,6 +35,10 @@
                 android:key="settings_notification"
                 android:title="@string/settings_notification"
                 android:defaultValue="true"/>
+        <SwitchPreference
+                android:key="settings_dark_theme"
+                android:title="@string/settings_dark_theme"
+                android:defaultValue="false"/>
         <EditTextPreference
                 android:key="settings_log_size"
                 android:selectAllOnFocus="false"