Reduce amount of code

automotive/build.gradle

@@ -34,6 +34,10 @@ android {
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
     }
 
+    buildFeatures {
+        viewBinding true
+    }
+
     compileOptions {
         sourceCompatibility 1.8
         targetCompatibility 1.8

automotive/src/main/java/com/example/android/uamp/automotive/PinCodeSignInFragment.kt

@@ -36,7 +36,7 @@ import androidx.lifecycle.ViewModelProvider
  *<p>This screen serves as a demo for UI best practices for PIN code sign in. Sign in implementation
  * will be app specific and is not included.
  */
-class PinCodeSignInFragment : Fragment() {
+class PinCodeSignInFragment : Fragment(R.layout.pin_sign_in) {
 
     private lateinit var toolbar: Toolbar
     private lateinit var appIcon: ImageView
@@ -45,13 +45,6 @@ class PinCodeSignInFragment : Fragment() {
     private lateinit var pinCodeContainer: ViewGroup
     private lateinit var footerTextView: TextView
 
-    override fun onCreateView(
-        inflater: LayoutInflater, container: ViewGroup?,
-        savedInstanceState: Bundle?
-    ): View? {
-        return inflater.inflate(R.layout.pin_sign_in, container, false)
-    }
-
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
         val context = requireContext()

automotive/src/main/java/com/example/android/uamp/automotive/QrCodeSignInFragment.kt

@@ -18,15 +18,12 @@ package com.example.android.uamp.automotive
 
 import android.os.Bundle
 import android.text.method.LinkMovementMethod
-import android.view.LayoutInflater
 import android.view.View
-import android.view.ViewGroup
-import android.widget.ImageView
-import android.widget.TextView
-import androidx.appcompat.widget.Toolbar
+import androidx.core.content.ContextCompat.getDrawable
 import androidx.core.text.HtmlCompat
 import androidx.fragment.app.Fragment
 import com.bumptech.glide.Glide
+import com.example.android.uamp.automotive.databinding.QrSignInBinding
 
 /**
  * Fragment that is used to facilitate QR code sign-in. Users scan a QR code rendered by this
@@ -35,57 +32,27 @@ import com.bumptech.glide.Glide
  * <p>This screen serves as a demo for UI best practices for QR code sign in. Sign in implementation
  * will be app specific and is not included.
  */
-class QrCodeSignInFragment : Fragment() {
-
-    private lateinit var toolbar: Toolbar
-    private lateinit var appIcon: ImageView
-    private lateinit var primaryTextView: TextView
-    private lateinit var secondaryTextView: TextView
-    private lateinit var qrCode: ImageView
-    private lateinit var footerTextView: TextView
-
-    override fun onCreateView(
-        inflater: LayoutInflater, container: ViewGroup?,
-        savedInstanceState: Bundle?
-    ): View? {
-        return inflater.inflate(R.layout.qr_sign_in, container, false)
-    }
+class QrCodeSignInFragment : Fragment(R.layout.qr_sign_in) {
 
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
-        val context = requireContext()
+        val binding = QrSignInBinding.bind(view)
 
-        toolbar = view.findViewById(R.id.toolbar)
-        appIcon = view.findViewById(R.id.app_icon)
-        primaryTextView = view.findViewById(R.id.primary_message)
-        secondaryTextView = view.findViewById(R.id.secondary_message)
-        qrCode = view.findViewById(R.id.qr_code)
-        footerTextView = view.findViewById(R.id.footer)
-
-        toolbar.setNavigationOnClickListener {
+        binding.toolbar.setNavigationOnClickListener {
             requireActivity().supportFragmentManager.popBackStack()
         }
 
-        appIcon.setImageDrawable(context.getDrawable(R.drawable.aural_logo))
-        primaryTextView.text = getString(R.string.qr_sign_in_primary_text)
-        secondaryTextView.text = getString(R.string.qr_sign_in_secondary_text)
+        binding.appIcon.setImageDrawable(getDrawable(requireContext(), R.drawable.aural_logo))
+        binding.primaryMessage.text = getString(R.string.qr_sign_in_primary_text)
+        binding.secondaryMessage.text = getString(R.string.qr_sign_in_secondary_text)
 
         // Links in footer text should be clickable.
-        footerTextView.text = HtmlCompat.fromHtml(
-            context.getString(R.string.sign_in_footer),
+        binding.footer.text = HtmlCompat.fromHtml(
+            requireContext().getString(R.string.sign_in_footer),
             HtmlCompat.FROM_HTML_MODE_LEGACY
         )
-        footerTextView.movementMethod = LinkMovementMethod.getInstance()
-
-        setQrCode(getString(R.string.qr_code_url))
-    }
+        binding.footer.movementMethod = LinkMovementMethod.getInstance()
 
-    /**
-     * Sets the QR code rendered on this sign in screen.
-     *
-     * @param code The QR code to display.
-     */
-    private fun setQrCode(url: String) {
-        Glide.with(this).load(url).into(qrCode)
+        Glide.with(this).load(getString(R.string.qr_code_url)).into(binding.qrCode)
     }
 }

automotive/src/main/java/com/example/android/uamp/automotive/SettingsActivity.kt

@@ -18,21 +18,20 @@ package com.example.android.uamp.automotive
 
 import android.os.Bundle
 import androidx.appcompat.app.AppCompatActivity
-import androidx.appcompat.widget.Toolbar
+import com.example.android.uamp.automotive.databinding.ActivitySettingsBinding
 
 /**
  * This class exposes application settings
  * for integration with MediaCenter in Android Automotive.
  */
 class SettingsActivity : AppCompatActivity() {
-    private lateinit var toolbar: Toolbar
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
-        setContentView(R.layout.activity_settings)
+        val binding = ActivitySettingsBinding.inflate(layoutInflater)
+        setContentView(binding.root)
 
-        toolbar = findViewById(R.id.toolbar)
-        setSupportActionBar(toolbar)
+        setSupportActionBar(binding.toolbar)
         supportActionBar?.setHomeButtonEnabled(true)
         supportActionBar?.setDisplayHomeAsUpEnabled(true)