surfaceviewを使用して撮影後、imageviewに表示したい

前提・実現したいこと

現在surfaceviewにカメラpreviewを表示しております。
写真を撮るとトーストを表示されるようにしているのですが、
次は撮った写真をimageviewで表示したいと考えています。

発生している問題・エラーメッセージ

写真を撮ってみると、トースト表示していることもあり
写真を撮れていることの確認とファイル名がとれていることがわかっております。
しかし、この後imageviewで表示するために
どうすればいいのかわかっておりません。
こちらはギャラリーを一度開く必要があるのでしょうか。それともファイル名が取得できてさえいればそのまま表示できるのでしょうか。

該当のソースコード

MainActivity
1import android.Manifest.permission.CAMERA
2import android.Manifest.permission.WRITE_EXTERNAL_STORAGE
3import android.app.AlertDialog
4import android.content.ContentValues
5import android.content.Intent
6import android.content.pm.PackageManager
7import android.hardware.Camera
8import android.net.Uri
9import android.os.Build
10import android.os.Bundle
11import android.os.Environment
12import android.provider.MediaStore
13import android.view.SurfaceHolder
14import android.view.SurfaceView
15import android.view.View
16import android.widget.Button
17import android.widget.ImageView
18import android.widget.Toast
19import androidx.appcompat.app.AppCompatActivity
20import androidx.core.app.ActivityCompat
21import androidx.core.content.ContextCompat
22import java.io.File
23import java.io.FileNotFoundException
24import java.io.FileOutputStream
25import java.io.IOException
26import java.util.*
27
28class MainActivity : AppCompatActivity(), SurfaceHolder.Callback, Camera.PictureCallback {
29
30    private var surfaceHolder: SurfaceHolder? = null
31    private var camera: Camera? = null
32
33    private var surfaceView: SurfaceView? = null
34
35    private val neededPermissions = arrayOf(CAMERA, WRITE_EXTERNAL_STORAGE)
36
37    private var _imageUri: Uri? = null
38
39    override fun onCreate(savedInstanceState: Bundle?) {
40        super.onCreate(savedInstanceState)
41        setContentView(R.layout.activity_main)
42
43        surfaceView = findViewById(R.id.surfaceView)
44        val result = checkPermission()
45        if (result) {
46            setupSurfaceHolder()
47        }
48    }
49//    public override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
50//        super.onActivityResult(requestCode, resultCode, data)
51//        if(requestCode == 200 && resultCode == RESULT_OK) {
52//
53//
54//        }
55//    }
56
57    private fun checkPermission(): Boolean {
58        val currentAPIVersion = Build.VERSION.SDK_INT
59        if (currentAPIVersion >= android.os.Build.VERSION_CODES.M) {
60            val permissionsNotGranted = ArrayList<String>()
61            for (permission in neededPermissions) {
62                if (ContextCompat.checkSelfPermission(this, permission) != PackageManager.PERMISSION_GRANTED) {
63                    permissionsNotGranted.add(permission)
64                }
65            }
66            if (permissionsNotGranted.size > 0) {
67                var shouldShowAlert = false
68                for (permission in permissionsNotGranted) {
69                    shouldShowAlert = ActivityCompat.shouldShowRequestPermissionRationale(this, permission)
70                }
71
72                val arr = arrayOfNulls<String>(permissionsNotGranted.size)
73                val permissions = permissionsNotGranted.toArray(arr)
74                if (shouldShowAlert) {
75                    showPermissionAlert(permissions)
76                } else {
77                    requestPermissions(permissions)
78                }
79                return false
80            }
81        }
82        return true
83    }
84
85    private fun showPermissionAlert(permissions: Array<String?>) {
86        val alertBuilder = AlertDialog.Builder(this)
87        alertBuilder.setCancelable(true)
88        alertBuilder.setTitle(R.string.permission_required)
89        alertBuilder.setMessage(R.string.permission_message)
90        alertBuilder.setPositiveButton(android.R.string.yes) { _, _ -> requestPermissions(permissions) }
91        val alert = alertBuilder.create()
92        alert.show()
93    }
94
95    private fun requestPermissions(permissions: Array<String?>) {
96        ActivityCompat.requestPermissions(this@MainActivity, permissions, REQUEST_CODE)
97    }
98
99    override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<String>, grantResults: IntArray) {
100        when (requestCode) {
101            REQUEST_CODE -> {
102                for (result in grantResults) {
103                    if (result == PackageManager.PERMISSION_DENIED) {
104                        Toast.makeText(this@MainActivity, R.string.permission_warning, Toast.LENGTH_LONG).show()
105                        View.VISIBLE.setViewVisibility(R.id.showPermissionMsg)
106                        return
107                    }
108                }
109
110                setupSurfaceHolder()
111            }
112        }
113        super.onRequestPermissionsResult(requestCode, permissions, grantResults)
114    }
115
116    private fun Int.setViewVisibility(id: Int) {
117        val view = findViewById<View>(id)
118        view!!.visibility = this
119    }
120
121    private fun setupSurfaceHolder() {
122        View.VISIBLE.setViewVisibility(R.id.startBtn)
123        View.VISIBLE.setViewVisibility(R.id.surfaceView)
124
125        surfaceHolder = surfaceView!!.holder
126        surfaceHolder!!.addCallback(this)
127        setBtnClick()
128    }
129
130    private fun setBtnClick() {
131        val startBtn = findViewById<Button>(R.id.startBtn)
132        startBtn?.setOnClickListener { captureImage() }
133    }
134
135    private fun captureImage() {
136        if (camera != null) {
137            camera!!.takePicture(null, null, this)
138        }
139    }
140
141    override fun surfaceCreated(surfaceHolder: SurfaceHolder) {
142        startCamera()
143    }
144
145    private fun startCamera() {
146        camera = Camera.open()
147        camera!!.setDisplayOrientation(90)
148        try {
149            camera!!.setPreviewDisplay(surfaceHolder)
150            camera!!.startPreview()
151        } catch (e: IOException) {
152            e.printStackTrace()
153        }
154
155    }
156
157    override fun surfaceChanged(surfaceHolder: SurfaceHolder, i: Int, i1: Int, i2: Int) {
158        resetCamera()
159    }
160
161    private fun resetCamera() {
162        if (surfaceHolder!!.surface == null) {
163            // Return if preview surface does not exist
164            return
165        }
166
167        // Stop if preview surface is already running.
168        camera!!.stopPreview()
169        try {
170            // Set preview display
171            camera!!.setPreviewDisplay(surfaceHolder)
172        } catch (e: IOException) {
173            e.printStackTrace()
174        }
175
176        // Start the camera preview...
177        camera!!.startPreview()
178    }
179
180    override fun surfaceDestroyed(surfaceHolder: SurfaceHolder) {
181        releaseCamera()
182    }
183
184    private fun releaseCamera() {
185        camera!!.stopPreview()
186        camera!!.release()
187        camera = null
188    }
189
190    override fun onPictureTaken(bytes: ByteArray, camera: Camera) {
191        saveImage(bytes)
192        resetCamera()
193    }
194
195    private fun saveImage(bytes: ByteArray) {
196        val outStream: FileOutputStream
197        try {
198            val fileName = "TUTORIALWING_" + System.currentTimeMillis() + ".jpg"
199            val file = File(Environment.getExternalStorageDirectory(), fileName)
200
201
202
203            val values = ContentValues()
204            values.put(MediaStore.Images.Media.TITLE, fileName)
205            values.put(MediaStore.Images.Media.MIME_TYPE, "image/jpeg")
206            _imageUri = contentResolver.insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values)
207//            val intent = Intent(MediaStore.ACTION_IMAGE_CAPTURE)
208            intent.putExtra(MediaStore.EXTRA_OUTPUT, _imageUri)
209//            startActivityForResult(intent, 200)
210
211            outStream = FileOutputStream(file)
212            outStream.write(bytes)
213            outStream.close()
214            Toast.makeText(this@MainActivity, "Picture Saved: $fileName", Toast.LENGTH_LONG).show()
215
216            val ivCamera = findViewById<ImageView>(R.id.ivCamera)
217            ivCamera.setImageURI(_imageUri)
218
219        } catch (e: FileNotFoundException) {
220            e.printStackTrace()
221        } catch (e: IOException) {
222            e.printStackTrace()
223        }
224    }
225
226    companion object {
227        const val REQUEST_CODE = 100
228    }
229}

xml
1<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
2    xmlns:app="http://schemas.android.com/apk/res-auto"
3    xmlns:tools="http://schemas.android.com/tools"
4    android:layout_width="match_parent"
5    android:layout_height="match_parent"
6    android:orientation="vertical">
7
8    <SurfaceView
9        android:id="@+id/surfaceView"
10        android:layout_width="match_parent"
11        android:layout_height="match_parent"
12        android:visibility="gone" />
13
14    <Button
15        android:id="@+id/startBtn"
16        android:layout_width="wrap_content"
17        android:layout_height="wrap_content"
18        android:layout_gravity="center_horizontal|bottom"
19        android:text="@string/take_photo"
20        android:visibility="gone" />
21
22    <TextView
23        android:id="@+id/showPermissionMsg"
24        android:layout_width="wrap_content"
25        android:layout_height="wrap_content"
26        android:layout_gravity="center"
27        android:padding="@dimen/show_permission_padding"
28        android:text="@string/permission_message"
29        android:textAlignment="center"
30        android:textStyle="bold|italic"
31        android:visibility="gone" />
32
33    <ImageView
34        android:id="@+id/ivCamera"
35        android:layout_width="match_parent"
36        android:layout_height="match_parent"
37        android:layout_gravity="center"
38        android:scaleType="center"/>
39
40</FrameLayout>