Add DohPreference

app/src/main/java/com/hippo/ehviewer/preference/DohPreference.kt

@@ -0,0 +1,19 @@
+package com.hippo.ehviewer.preference
+
+import android.content.Context
+import android.util.AttributeSet
+import androidx.preference.Preference
+import com.hippo.ehviewer.R
+import com.hippo.ehviewer.Settings
+import com.hippo.ehviewer.ui.legacy.EditTextDialogBuilder
+
+class DohPreference @JvmOverloads constructor(
+    context: Context,
+    attrs: AttributeSet? = null,
+) : Preference(context, attrs) {
+    override fun onClick() {
+        val builder = EditTextDialogBuilder(context, Settings.dohUrl, context.getString(R.string.settings_advanced_dns_over_http_hint))
+        builder.setTitle(R.string.settings_advanced_dns_over_http_title)
+        builder.setPositiveButton(android.R.string.ok) { _, _ -> Settings.putDohUrl(builder.text.trim()) }.show()
+    }
+}