Add preference library and settings fragment placeholder

app/build.gradle

@@ -44,4 +44,6 @@ dependencies {
     testImplementation 'junit:junit:4.12'
     androidTestImplementation 'androidx.test.ext:junit:1.1.1'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
+
+    implementation 'androidx.preference:preference:1.1.0'
 }

app/src/main/java/com/rtbishop/lookingsat/ui/SettingsFragment.kt

@@ -1,24 +1,11 @@
 package com.rtbishop.lookingsat.ui
 
 import android.os.Bundle
-import android.view.LayoutInflater
-import android.view.View
-import android.view.ViewGroup
-import androidx.fragment.app.Fragment
-import androidx.lifecycle.ViewModelProviders
-import com.rtbishop.lookingsat.MainViewModel
+import androidx.preference.PreferenceFragmentCompat
 import com.rtbishop.lookingsat.R
 
-class SettingsFragment : Fragment() {
-
-    private lateinit var viewModel: MainViewModel
-
-    override fun onCreateView(
-        inflater: LayoutInflater,
-        container: ViewGroup?,
-        savedInstanceState: Bundle?
-    ): View? {
-        viewModel = ViewModelProviders.of(this).get(MainViewModel::class.java)
-        return inflater.inflate(R.layout.fragment_sky, container, false)
+class SettingsFragment : PreferenceFragmentCompat() {
+    override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
+        setPreferencesFromResource(R.xml.preference, rootKey)
     }
 }

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

@@ -10,4 +10,6 @@
     <string name="menu_about">About</string>
     <string name="menu_github">GitHub</string>
     <string name="menu_credits">Credits</string>
+
+    <string name="placeholder">Placeholder</string>
 </resources>

app/src/main/res/xml/preference.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
+    <PreferenceCategory android:title="@string/placeholder">
+        <EditTextPreference
+            android:key="username"
+            android:summary="@string/placeholder"
+            android:title="@string/placeholder" />
+        <EditTextPreference
+            android:key="password"
+            android:summary="@string/placeholder"
+            android:title="@string/placeholder" />
+    </PreferenceCategory>
+</PreferenceScreen>