Android Studio camera2を使用して写真撮影する際の画像が黒くなってしまっています。

前提・実現したいこと

最終的な目標は、ボタンを押して1分間画像を撮影し続けて保存するアプリ
現在、最終目標の前に、まずは、ボタンを押して写真を撮影＆保存するアプリを作成しています。

起きている問題

TextureViewの画面、撮影した画像が黒くなってしまっています。
ログを見る限りカメラは読み込んでいるので、なぜ黒くなってしまうのか分かりません。

補足情報（FW/ツールのバージョンなど）

Android studio 4.0
Android 8.1 API27
JAVA

JAVA
1import androidx.core.app.ActivityCompat;
2
3import android.Manifest;
4import android.annotation.TargetApi;
5import android.app.Activity;
6import android.content.Context;
7import android.content.pm.PackageManager;
8import android.graphics.Bitmap;
9import android.graphics.SurfaceTexture;
10import android.hardware.camera2.CameraAccessException;
11import android.hardware.camera2.CameraCaptureSession;
12import android.hardware.camera2.CameraDevice;
13import android.hardware.camera2.CameraManager;
14import android.hardware.camera2.CaptureRequest;
15import android.os.Build;
16import android.os.Bundle;
17import android.os.Handler;
18import android.view.Surface;
19import android.view.TextureView;
20import android.view.View;
21import android.widget.Button;
22
23import java.io.File;
24import java.io.FileNotFoundException;
25import java.io.FileOutputStream;
26import java.io.IOException;
27import java.util.Arrays;
28
29
30public class MainActivity extends Activity {
31
32    private CameraDevice mCameraDevice;
33    private TextureView mTextureView;
34    private Handler mBackgroundHandler = new Handler();
35    private CameraCaptureSession mCaptureSession = null;
36
37    private CaptureRequest.Builder mPreviewRequestBuilder;
38    private CaptureRequest mPreviewRequest;
39
40 
41    @Override
42    protected void onCreate(Bundle savedInstanceState) {
43        super.onCreate( savedInstanceState );
44        setContentView( R.layout.activity_main );
45
46        mTextureView = (TextureView) findViewById( R.id.texture );
47        mTextureView.setSurfaceTextureListener( new TextureView.SurfaceTextureListener() {
48            @Override
49            public void onSurfaceTextureAvailable(SurfaceTexture surface, int width, int height) {
50                // 先ほどのカメラを開く部分をメソッド化した
51                openCamera();
52            }
53
54            @Override
55            public void onSurfaceTextureSizeChanged(SurfaceTexture surface, int width, int height) {
56
57            }
58
59            @Override
60            public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) {
61
62                return true;
63            }
64
65            @Override
66            public void onSurfaceTextureUpdated(SurfaceTexture surface) {
67
68            }
69        } );
70
71        Button capture = (Button) findViewById( R.id.button_capture );
72        capture.setOnClickListener( new View.OnClickListener() {
73            @Override
74            public void onClick(View v) {
75                try {
76                 
77                    if (mTextureView.isAvailable()) {
78                        File file = new File( getFilesDir(), "surface_text.jpg" );
79                        FileOutputStream fos = new FileOutputStream( file );
80                        Bitmap bitmap = mTextureView.getBitmap();
81                        bitmap.compress( Bitmap.CompressFormat.JPEG, 50, fos );
82                        fos.close();
83                    }
84                   
85                } catch (FileNotFoundException e) {
86                    e.printStackTrace();
87                } catch (IOException e) {
88                    e.printStackTrace();
89                }
90            }
91        } );
92    }
93
94    private void openCamera() {
95        CameraManager manager = (CameraManager) getSystemService( Context.CAMERA_SERVICE );
96        String selectedCameraId = "";
97        try {
98            selectedCameraId = manager.getCameraIdList()[0];
99
100        } catch (CameraAccessException e) {
101            e.printStackTrace();
102        }
103
104        try {
105            if (ActivityCompat.checkSelfPermission( this, Manifest.permission.CAMERA ) != PackageManager.PERMISSION_GRANTED) {
106                // TODO: Consider calling
107                //    ActivityCompat#requestPermissions
108                // here to request the missing permissions, and then overriding
109                //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
110                //                                          int[] grantResults)
111                // to handle the case where the user grants the permission. See the documentation
112                // for ActivityCompat#requestPermissions for more details.
113                return;
114            }
115            manager.openCamera( selectedCameraId, mStateCallback, mBackgroundHandler );
116        } catch (CameraAccessException e) {
117            e.printStackTrace();
118        }
119    }
120
121    private final CameraDevice.StateCallback mStateCallback = new CameraDevice.StateCallback() {
122        @Override
123        public void onOpened(CameraDevice cameraDevice) {
124            mCameraDevice = cameraDevice;
125            createCameraPreviewSession();
126        }
127
128        @Override
129        public void onDisconnected(CameraDevice cameraDevice) {
130            cameraDevice.close();
131            mCameraDevice = null;
132        }
133
134        @Override
135        public void onError(CameraDevice cameraDevice, int error) {
136            cameraDevice.close();
137            mCameraDevice = null;
138        }
139
140    };
141
142    private void createCameraPreviewSession() {
143        SurfaceTexture texture = mTextureView.getSurfaceTexture();
144        texture.setDefaultBufferSize(320, 240);
145        Surface surface = new Surface(texture);
146
147        try {
148            mPreviewRequestBuilder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
149            mPreviewRequestBuilder.addTarget(surface);
150            mPreviewRequest = mPreviewRequestBuilder.build();
151        } catch (CameraAccessException e) {
152            e.printStackTrace();
153        }
154
155        try {
156            mCameraDevice.createCaptureSession(Arrays.asList(surface), new CameraCaptureSession.StateCallback() {
157                @Override
158                public void onConfigured(CameraCaptureSession session) {
159                    // カメラがcloseされている場合
160                    if (null == mCameraDevice) {
161                        return;
162                    }
163
164                    mCaptureSession = session;
165
166                    try {
167                        session.setRepeatingRequest(mPreviewRequest, null, null);
168                    } catch (CameraAccessException e) {
169                        e.printStackTrace();
170                    }
171                }
172
173                @Override
174                public void onConfigureFailed(CameraCaptureSession session) {
175
176                }
177            }, null);
178        } catch (CameraAccessException e) {
179            e.printStackTrace();
180        }
181    }
182}

JAVA
1activity_main.xml
2
3<?xml version="1.0" encoding="utf-8"?>
4<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
5    xmlns:app="http://schemas.android.com/apk/res-auto"
6    xmlns:tools="http://schemas.android.com/tools"
7    android:layout_width="match_parent"
8    android:layout_height="match_parent"
9    tools:context=".MainActivity">
10
11    <TextureView
12        android:id="@+id/texture"
13        android:layout_width="fill_parent"
14        android:layout_height="fill_parent"
15        android:layout_weight="1"
16        tools:ignore="MissingConstraints">
17    </TextureView>
18
19    <Button
20        android:id="@+id/button_capture"
21        android:text="Capture"
22        android:layout_width="wrap_content"
23        android:layout_height="wrap_content"
24        android:layout_gravity="center"
25        tools:ignore="MissingConstraints" />
26
27</androidx.constraintlayout.widget.ConstraintLayout>

JAVA
1AndroidManifest.cml
2
3<?xml version="1.0" encoding="utf-8"?>
4<manifest xmlns:android="http://schemas.android.com/apk/res/android"
5    package="com.example.camera2">
6    <uses-permission android:name="android.permission.CAMERA" />
7    <application
8        android:allowBackup="true"
9        android:icon="@mipmap/ic_launcher"
10        android:label="@string/app_name"
11        android:roundIcon="@mipmap/ic_launcher_round"
12        android:supportsRtl="true"
13        android:theme="@style/AppTheme">
14        <activity android:name=".MainActivity">
15            android:label="@string/app_name"
16            android:screenOrientation="landscape"
17            android:theme="@android:style/Theme.Holo.NoActionBar">
18            <intent-filter>
19                <action android:name="android.intent.action.MAIN" />
20
21                <category android:name="android.intent.category.LAUNCHER" />
22            </intent-filter>
23        </activity>
24    </application>
25
26</manifest>