feat: access camera preview

app/build.gradle.kts

@@ -53,6 +53,10 @@ dependencies {
     implementation("androidx.constraintlayout:constraintlayout:2.1.4")
     implementation("com.google.android.gms:play-services-maps:18.2.0")
     implementation("com.google.android.gms:play-services-location:21.2.0")
+    implementation("androidx.camera:camera-core:1.3.2")
+    implementation("androidx.camera:camera-camera2:1.3.2")
+    implementation("androidx.camera:camera-lifecycle:1.3.2")
+    implementation("androidx.camera:camera-view:1.3.2")
     testImplementation("junit:junit:4.13.2")
     androidTestImplementation("androidx.test.ext:junit:1.1.5")
     androidTestImplementation("androidx.test.espresso:espresso-core:3.5.1")

app/src/main/AndroidManifest.xml

@@ -5,6 +5,10 @@
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
 
+    <uses-permission android:name="android.permission.CAMERA" />
+    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
+    <uses-feature android:name="android.hardware.camera.any" />
+
     <application
         android:allowBackup="true"
         android:icon="@mipmap/ic_primary_logo"

app/src/main/java/com/example/nerbos/fragments/scan/ScanFragment.kt

@@ -5,56 +5,64 @@ import androidx.fragment.app.Fragment
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
+import androidx.camera.core.CameraSelector
+import androidx.camera.core.Preview
+import androidx.camera.lifecycle.ProcessCameraProvider
+import androidx.camera.view.PreviewView
+import androidx.core.content.ContextCompat
 import com.example.nerbos.R
+import java.util.concurrent.ExecutorService
+import java.util.concurrent.Executors
 
-// TODO: Rename parameter arguments, choose names that match
-// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
-private const val ARG_PARAM1 = "param1"
-private const val ARG_PARAM2 = "param2"
-
-/**
- * A simple [Fragment] subclass.
- * Use the [ScanFragment.newInstance] factory method to
- * create an instance of this fragment.
- */
 class ScanFragment : Fragment() {
-    // TODO: Rename and change types of parameters
-    private var param1: String? = null
-    private var param2: String? = null
-
-    override fun onCreate(savedInstanceState: Bundle?) {
-        super.onCreate(savedInstanceState)
-        arguments?.let {
-            param1 = it.getString(ARG_PARAM1)
-            param2 = it.getString(ARG_PARAM2)
-        }
-    }
+
+    private lateinit var previewView: PreviewView
+    private lateinit var cameraExecutor: ExecutorService
 
     override fun onCreateView(
         inflater: LayoutInflater, container: ViewGroup?,
         savedInstanceState: Bundle?
     ): View? {
         // Inflate the layout for this fragment
-        return inflater.inflate(R.layout.fragment_scan, container, false)
+        val view = inflater.inflate(R.layout.fragment_scan, container, false)
+        previewView = view.findViewById(R.id.previewView)
+        return view
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+
+        cameraExecutor = Executors.newSingleThreadExecutor()
+
+        startCamera()
     }
 
-    companion object {
-        /**
-         * Use this factory method to create a new instance of
-         * this fragment using the provided parameters.
-         *
-         * @param param1 Parameter 1.
-         * @param param2 Parameter 2.
-         * @return A new instance of fragment Scan.
-         */
-        // TODO: Rename and change types and number of parameters
-        @JvmStatic
-        fun newInstance(param1: String, param2: String) =
-            ScanFragment().apply {
-                arguments = Bundle().apply {
-                    putString(ARG_PARAM1, param1)
-                    putString(ARG_PARAM2, param2)
+    private fun startCamera() {
+        val cameraProviderFuture = ProcessCameraProvider.getInstance(requireContext())
+
+        cameraProviderFuture.addListener({
+            val cameraProvider: ProcessCameraProvider = cameraProviderFuture.get()
+
+            val preview = Preview.Builder()
+                .build()
+                .also {
+                    it.setSurfaceProvider(previewView.surfaceProvider)
                 }
+
+            val cameraSelector = CameraSelector.DEFAULT_BACK_CAMERA
+
+            try {
+                cameraProvider.unbindAll()
+                cameraProvider.bindToLifecycle(this, cameraSelector, preview)
+            } catch (e: Exception) {
+                e.printStackTrace()
             }
+
+        }, ContextCompat.getMainExecutor(requireContext()))
+    }
+
+    override fun onDestroy() {
+        super.onDestroy()
+        cameraExecutor.shutdown()
     }
 }
\ No newline at end of file

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

@@ -3,14 +3,59 @@
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
+    android:background="@color/primary_bg"
     tools:context=".fragments.scan.ScanFragment">
 
-    <!-- TODO: Update blank fragment layout -->
-    <TextView
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:text="Scan Fragment"
-        android:textSize="26dp"
-        android:layout_gravity="center" />
+    <LinearLayout
+        android:id="@+id/scanVerticalLayout"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:orientation="vertical">
+
+        <Space
+            android:layout_width="match_parent"
+            android:layout_height="75dp" />
+
+        <androidx.camera.view.PreviewView
+            android:id="@+id/previewView"
+            android:layout_width="300dp"
+            android:layout_height="400dp"
+            android:layout_gravity="center" />
+
+        <LinearLayout
+            android:id="@+id/scanHorizontalLayout"
+            android:layout_width="300dp"
+            android:layout_height="180dp"
+            android:layout_gravity="center"
+            android:orientation="horizontal">
+
+            <ImageButton
+                android:id="@+id/captureButton"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_gravity="center"
+                android:contentDescription="@string/capture_button"
+                android:src="@android:drawable/ic_menu_camera" />
+
+            <Space
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="1" />
+
+            <ImageButton
+                android:id="@+id/galleryButton"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_gravity="center"
+                android:contentDescription="@string/gallery_button"
+                android:src="@android:drawable/ic_menu_gallery" />
+
+        </LinearLayout>
+
+        <Space
+            android:layout_width="match_parent"
+            android:layout_height="75dp" />
+
+    </LinearLayout>
 
 </FrameLayout>
\ No newline at end of file

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

@@ -51,5 +51,7 @@
     <string name="network_sensing_string">No Internet Connection Please check your connection and try again.</string>
     <string name="close_button">Close Button</string>
     <string name="pie_chart">Pie Chart</string>
+    <string name="capture_button">Capture Button</string>
+    <string name="gallery_button">Gallery Button</string>
 
 </resources>
\ No newline at end of file