reformat code

app/src/main/java/io/legado/app/ui/config/ThemeConfigFragment.kt

@@ -4,6 +4,7 @@ import android.content.SharedPreferences
 import android.os.Bundle
 import android.os.Handler
 import androidx.appcompat.app.AlertDialog
+import androidx.preference.Preference
 import androidx.preference.PreferenceFragmentCompat
 import com.jeremyliao.liveeventbus.LiveEventBus
 import io.legado.app.App
@@ -34,6 +35,7 @@ class ThemeConfigFragment : PreferenceFragmentCompat(), SharedPreferences.OnShar
 
     override fun onSharedPreferenceChanged(sharedPreferences: SharedPreferences?, key: String?) {
         sharedPreferences ?: return
+        activity ?: return
         when (key) {
             "colorPrimary", "colorAccent", "colorBackground" ->
                 if (!ColorUtils.isColorLight(
@@ -43,7 +45,7 @@ class ThemeConfigFragment : PreferenceFragmentCompat(), SharedPreferences.OnShar
                         )
                     )
                 ) {
-                    AlertDialog.Builder(App.INSTANCE)
+                    AlertDialog.Builder(activity!!)
                         .setTitle("白天背景太暗")
                         .setMessage("将会恢复默认背景？")
                         .setPositiveButton(R.string.ok) { _, _ ->
@@ -63,7 +65,7 @@ class ThemeConfigFragment : PreferenceFragmentCompat(), SharedPreferences.OnShar
                         )
                     )
                 ) {
-                    AlertDialog.Builder(App.INSTANCE)
+                    AlertDialog.Builder(activity!!)
                         .setTitle("夜间背景太亮")
                         .setMessage("将会恢复默认背景？")
                         .setPositiveButton(R.string.ok) { _, _ ->
@@ -82,6 +84,33 @@ class ThemeConfigFragment : PreferenceFragmentCompat(), SharedPreferences.OnShar
 
     }
 
+    override fun onPreferenceTreeClick(preference: Preference?): Boolean {
+        when (preference?.key) {
+            "defaultTheme" -> {
+                AlertDialog.Builder(activity!!)
+                    .setTitle("恢复默认主题")
+                    .setMessage("是否确认恢复？")
+                    .setPositiveButton(R.string.ok) { _, _ ->
+                        preferenceManager.sharedPreferences.edit()
+                            .putInt("colorPrimary", App.INSTANCE.getCompatColor(R.color.md_grey_100))
+                            .putInt("colorAccent", App.INSTANCE.getCompatColor(R.color.md_pink_600))
+                            .putInt("colorBackground", App.INSTANCE.getCompatColor(R.color.md_grey_100))
+                            .putInt("colorPrimaryNight", App.INSTANCE.getCompatColor(R.color.md_grey_800))
+                            .putInt("colorAccentNight", App.INSTANCE.getCompatColor(R.color.md_pink_800))
+                            .putInt("colorBackgroundNight", App.INSTANCE.getCompatColor(R.color.md_grey_800))
+                            .apply()
+                        App.INSTANCE.upThemeStore()
+                        LiveEventBus.get().with(Bus.recreate).post("")
+                        Handler().postDelayed({ activity?.recreate() }, 100)
+                    }
+                    .setNegativeButton(R.string.cancel, null)
+                    .show()
+                    .upTint
+            }
+        }
+        return super.onPreferenceTreeClick(preference)
+    }
+
     private fun upTheme(isNightTheme: Boolean) {
         if (App.INSTANCE.getPrefBoolean("isNightTheme", false) == isNightTheme) {
             App.INSTANCE.upThemeStore()