prefs: add dialog for editing mpv.conf

app/src/main/java/is/xyz/mpv/MpvConfEditDialog.kt

@@ -0,0 +1,40 @@
+package `is`.xyz.mpv
+
+import android.content.Context
+import android.preference.DialogPreference
+import android.util.AttributeSet
+import android.view.View
+import android.widget.Button
+import android.widget.EditText
+import java.io.File
+
+class MpvConfEditDialog @JvmOverloads constructor(
+        context: Context,
+        attrs: AttributeSet? = null,
+        defStyleAttr: Int = android.R.attr.dialogPreferenceStyle,
+        defStyleRes: Int = 0
+): DialogPreference(context, attrs, defStyleAttr, defStyleRes) {
+    private val configFile: File = File("${context.filesDir.path}/mpv.conf")
+
+    init {
+        isPersistent = false
+        dialogLayoutResource = R.layout.conf_editor
+    }
+
+    override fun onBindDialogView(view: View) {
+        super.onBindDialogView(view)
+
+        view.findViewById<Button>(R.id.button_cancel).setOnClickListener {
+            this.dialog.cancel()
+        }
+        view.findViewById<Button>(R.id.button_ok).setOnClickListener {
+            val content = view.findViewById<EditText>(R.id.editText).text.toString()
+            configFile.writeText(content)
+            this.dialog.dismiss()
+        }
+
+        val editText = view.findViewById<EditText>(R.id.editText)
+        if (configFile.exists())
+            editText.setText(configFile.readText())
+    }
+}

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

@@ -0,0 +1,43 @@
+<?xml version="1.0" encoding="utf-8"?>
+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent" android:layout_height="match_parent">
+
+    <TextView
+        android:id="@android:id/message"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:paddingEnd="0dp"
+        android:paddingStart="6dp" />
+
+    <Button
+        android:id="@+id/button_cancel"
+        style="@style/Widget.AppCompat.Button.Borderless.Colored"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_alignParentBottom="true"
+        android:layout_alignParentStart="true"
+        android:text="@string/dialog_cancel" />
+
+    <Button
+        android:id="@+id/button_ok"
+        style="@style/Base.Widget.AppCompat.Button.Borderless.Colored"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_alignParentBottom="true"
+        android:layout_alignParentEnd="true"
+        android:text="@string/dialog_ok" />
+
+    <EditText
+        android:id="@+id/editText"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_above="@+id/button_cancel"
+        android:layout_alignParentEnd="true"
+        android:layout_alignParentStart="true"
+        android:layout_below="@android:id/message"
+        android:fontFamily="monospace"
+        android:gravity="top"
+        android:inputType="textMultiLine|textNoSuggestions"
+        android:scrollbars="vertical" />
+
+</RelativeLayout>

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

@@ -74,6 +74,11 @@
 
     <string name="pref_advanced_version">Version information</string>
 
+    <string name="pref_advanced_mpvconf">Edit mpv.conf</string>
+    <string name="pref_advanced_mpvconf_message">You can directly edit mpv\'s config here.\nThough note that mpv-android will overwrite some settings, so don\'t try to set e.g. "dscale" here.
+    </string>
+
+
     <!-- Strings indirectly related to Settings -->
     <string name="scaler_param1">Param 1:</string>
     <string name="scaler_param2">Param 2:</string>

app/src/main/res/xml/pref_advanced.xml

@@ -1,7 +1,16 @@
 <?xml version="1.0" encoding="utf-8"?>
 <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <is.xyz.mpv.MpvConfEditDialog
+        android:key=""
+        android:title="@string/pref_advanced_mpvconf"
+        android:dialogMessage="@string/pref_advanced_mpvconf_message"
+        android:positiveButtonText="@null"
+        android:negativeButtonText="@null" />
+
     <is.xyz.mpv.VersionInfoDialog
         android:key=""
         android:title="@string/pref_advanced_version"
         android:negativeButtonText="@null" />
+
 </PreferenceScreen>