fix(gui): avoid strange spinner

app/src/main/java/io/nekohasekai/sagernet/ui/SettingsPreferenceFragment.kt

@@ -18,10 +18,7 @@ import io.nekohasekai.sagernet.ktx.*
 import io.nekohasekai.sagernet.utils.Theme
 import io.nekohasekai.sagernet.widget.AppListPreference
 import moe.matsuri.nb4a.Protocols
-import moe.matsuri.nb4a.ui.ColorPickerPreference
+import moe.matsuri.nb4a.ui.*
-import moe.matsuri.nb4a.ui.LongClickMenuPreference
-import moe.matsuri.nb4a.ui.MTUPreference
-import moe.matsuri.nb4a.ui.SimpleMenuPreference
 
 class SettingsPreferenceFragment : PreferenceFragmentCompat() {
 
@@ -113,9 +110,10 @@ class SettingsPreferenceFragment : PreferenceFragmentCompat() {
         val requireTransproxy = findPreference<SwitchPreference>(Key.REQUIRE_TRANSPROXY)!!
         val transproxyPort = findPreference<EditTextPreference>(Key.TRANSPROXY_PORT)!!
         val transproxyMode = findPreference<SimpleMenuPreference>(Key.TRANSPROXY_MODE)!!
-        val logLevel = findPreference<LongClickMenuPreference>(Key.LOG_LEVEL)!!
+        val logLevel = findPreference<LongClickListPreference>(Key.LOG_LEVEL)!!
         val mtu = findPreference<MTUPreference>(Key.MTU)!!
 
+        logLevel.dialogLayoutResource = R.layout.layout_loglevel_help
         logLevel.setOnPreferenceChangeListener { _, _ ->
             needRestart()
             true

app/src/main/java/moe/matsuri/nb4a/ui/LongClickListPreference.kt

@@ -0,0 +1,28 @@
+package moe.matsuri.nb4a.ui
+
+import android.content.Context
+import android.util.AttributeSet
+import android.view.View
+import androidx.preference.ListPreference
+import androidx.preference.PreferenceViewHolder
+import io.nekohasekai.sagernet.R
+
+class LongClickListPreference
+@JvmOverloads constructor(
+    context: Context, attrs: AttributeSet? = null, defStyle: Int = R.attr.dropdownPreferenceStyle
+) : ListPreference(context, attrs, defStyle, 0) {
+    private var mLongClickListener: View.OnLongClickListener? = null
+
+    override fun onBindViewHolder(holder: PreferenceViewHolder) {
+        super.onBindViewHolder(holder)
+        val itemView: View = holder.itemView
+        itemView.setOnLongClickListener {
+            mLongClickListener?.onLongClick(it) ?: true
+        }
+    }
+
+    fun setOnLongClickListener(longClickListener: View.OnLongClickListener) {
+        this.mLongClickListener = longClickListener
+    }
+
+}

app/src/main/java/moe/matsuri/nb4a/ui/MTUPreference.kt

@@ -5,7 +5,7 @@ import android.util.AttributeSet
 import android.view.View
 import android.view.inputmethod.EditorInfo
 import android.widget.EditText
-import androidx.core.content.res.TypedArrayUtils
+import androidx.preference.ListPreference
 import androidx.preference.PreferenceViewHolder
 import com.google.android.material.dialog.MaterialAlertDialogBuilder
 import io.nekohasekai.sagernet.R
@@ -13,11 +13,13 @@ import io.nekohasekai.sagernet.R
 class MTUPreference
 @JvmOverloads constructor(
     context: Context, attrs: AttributeSet? = null, defStyle: Int = R.attr.dropdownPreferenceStyle
-) : SimpleMenuPreference(context, attrs, defStyle, 0) {
+) : ListPreference(context, attrs, defStyle, 0) {
+
     init {
         setSummaryProvider {
             value.toString()
         }
+        dialogLayoutResource = R.layout.layout_mtu_help
     }
 
     override fun onBindViewHolder(holder: PreferenceViewHolder) {

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

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<TextView xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/help"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:text="@string/log_level_help"
+    android:textAlignment="center">
+
+</TextView>

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

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<TextView xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/help"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:text="@string/mtu_help"
+    android:textAlignment="center">
+
+</TextView>

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

@@ -511,5 +511,7 @@ Anyone can write advanced plugins, which can control NekoBox. please download an
     <string name="show_group_in_notification">Show group name in in notification</string>
     <string name="reset_connections">Reset Connections</string>
     <string name="remove_duplicate">Remove duplicate servers</string>
+    <string name="mtu_help">Long press the preference to set custom MTU.</string>
+    <string name="log_level_help">Long press the preference to set the buffer size.</string>
 
 </resources>

app/src/main/res/xml/global_preferences.xml

@@ -74,7 +74,7 @@
             app:summary="@string/show_direct_speed_sum"
             app:title="@string/show_direct_speed"
             app:useSimpleSummaryProvider="true" />
-        <moe.matsuri.nb4a.ui.LongClickMenuPreference
+        <moe.matsuri.nb4a.ui.LongClickListPreference
             app:defaultValue="0"
             app:entries="@array/log_level"
             app:entryValues="@array/int_array_5"