在响应本机中启动Perview失败的摄像头

Question

我有一个扫描QR码的组件。这是我的代码：

import QRCodeScanner from 'react-native-qrcode-scanner';
.
.
.
<QRCodeScanner
cameraType={'front'}
onRead={this.onSuccess.bind(this)} />
.
.
.
onSuccess(e) {
console.warn(e.data);
}

这是我的plist和androidmanifest.xml：

<key>NSCameraUsageDescription</key>
<string>Your message to user when the camera is accessed for the first                     
time</string>
<key>NSPhotoLibraryUsageDescription</key>
<string>Your message to user when the photo library is accessed for the    
first time</string>
<key>NSMicrophoneUsageDescription</key>
<string>Your message to user when the microsphone is accessed for the 
first time</string>

androidmanifest.xml：

    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.READ_PHONE_STATE" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.READ_CONTACTS"/>
    <uses-permission android:name="android.permission.WRITE_CONTACTS"/>
    <uses-permission android:name="android.permission.VIBRATE"/>

 <uses-permission android:name="android.permission.CAMERA" />   <uses-sdk
        android:minSdkVersion="16"
        android:targetSdkVersion="26" />

</manifest>

但我收到此错误：启动预览失败的相机

我该如何解决？

谢谢，前进