Create a basic tabbed settings activity

Tabs: Apps, Theme, Launcher

app/src/main/java/com/finnmglas/launcher/SettingsActivity.kt

@@ -8,20 +8,27 @@ import android.provider.Settings
 import android.view.View
 import android.view.WindowManager
 import androidx.appcompat.app.AppCompatActivity
+import androidx.viewpager.widget.ViewPager
+import com.finnmglas.launcher.ui.main.SectionsPagerAdapter
+import com.google.android.material.tabs.TabLayout
 
 
-//TODO Make Settings scrollable as soon as more are added
-
 class SettingsActivity : AppCompatActivity() {
 
     /** Activity Lifecycle functions */
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_settings)
 
         window.setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN)
         window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON)
 
-        setContentView(R.layout.activity_settings)
+        val sectionsPagerAdapter = SectionsPagerAdapter(this, supportFragmentManager)
+        val viewPager: ViewPager = findViewById(R.id.view_pager)
+        viewPager.adapter = sectionsPagerAdapter
+        val tabs: TabLayout = findViewById(R.id.tabs)
+        tabs.setupWithViewPager(viewPager)
     }
 
     override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {

app/src/main/java/com/finnmglas/launcher/ui/main/PageViewModel.kt

@@ -0,0 +1,19 @@
+package com.finnmglas.launcher.ui.main
+
+import androidx.lifecycle.LiveData
+import androidx.lifecycle.MutableLiveData
+import androidx.lifecycle.Transformations
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.ViewModelProvider
+
+class PageViewModel : ViewModel() {
+
+    private val _index = MutableLiveData<Int>()
+    val text: LiveData<String> = Transformations.map(_index) {
+        "Tab $it"
+    }
+
+    fun setIndex(index: Int) {
+        _index.value = index
+    }
+}

app/src/main/java/com/finnmglas/launcher/ui/main/SectionsPagerAdapter.kt

@@ -0,0 +1,32 @@
+package com.finnmglas.launcher.ui.main
+
+import android.content.Context
+import androidx.fragment.app.Fragment
+import androidx.fragment.app.FragmentManager
+import androidx.fragment.app.FragmentPagerAdapter
+import com.finnmglas.launcher.*
+
+private val TAB_TITLES = arrayOf(
+    R.string.settings_tab_app,
+    R.string.settings_tab_theme,
+    R.string.settings_tab_launcher
+)
+
+/** Returns the fragment corresponding to the selected tab.*/
+class SectionsPagerAdapter(private val context: Context, fm: FragmentManager)
+    : FragmentPagerAdapter(fm) {
+
+    override fun getItem(position: Int): Fragment {
+        return when (position){
+            else -> Fragment()
+        }
+    }
+
+    override fun getPageTitle(position: Int): CharSequence? {
+        return context.resources.getString(TAB_TITLES[position])
+    }
+
+    override fun getCount(): Int {
+        return 3
+    }
+}