android - 无法解决这个错误？Kotlin（二维码阅读器）
问题描述
我对此进行编码以构建 QR 阅读器。
class scannerActivity : AppCompatActivity() {
private var qrEader: QREader ?= null
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_scanner)
val Button = findViewById<Button>(R.id.button6)
Button.setOnClickListener {
startActivity(Intent(this@scannerActivity, conductorMenu::class.java))}
Dexter.withActivity(this@scannerActivity)
.withPermissions(Manifest.permission.CAMERA)
.withListener(object:PermissionListener, MultiplePermissionsListener {
override fun onPermissionGranted(response: PermissionGrantedResponse?) {
setupCamera()
}
override fun onPermissionDenied(response: PermissionDeniedResponse?) {
Toast.makeText(this@scannerActivity, "You must enable this permission", Toast.LENGTH_LONG).show()
}
override fun onPermissionRationaleShouldBeShown(
permission: PermissionRequest?,
token: PermissionToken?
) {
}
override fun onPermissionsChecked(report: MultiplePermissionsReport?) {
TODO("Not yet implemented")
}
override fun onPermissionRationaleShouldBeShown(
permissions: MutableList<PermissionRequest>?,
token: PermissionToken?
) {
}
}).check()
}
private fun setupCamera() {
val ToggleButton = findViewById<ToggleButton>(R.id.toggleButton)
ToggleButton.setOnClickListener{
if (qrEader!!.isCameraRunning){
ToggleButton.text = "START"
qrEader!!.stop()
}
else{
ToggleButton.text = "STOP"
qrEader!!.start()
}
}
setupQrEader()
}
@SuppressLint("WrongViewCast")
private fun setupQrEader() {
val camera_view = findViewById<SurfaceView>(R.id.camera_view)
val code_info = findViewById<TextView>(R.id.textView9)
qrEader = QREader.Builder(this,camera_view, QRDataListener { data ->
code_info.post { code_info.text = data }
}).facing(QREader.BACK_CAM)
.enableAutofocus(true)
.height(camera_view.height)
.width(camera_view.width)
.build()
}
override fun onResume() {
super.onResume()
val camera_view = findViewById<SurfaceView>(R.id.camera_view)
if (qrEader != null)
qrEader!!.initAndStart(camera_view)
}
override fun onPause() {
super.onPause()
if (qrEader != null)
qrEader!!.releaseAndCleanup()
}
}
这是我的XML 文件
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".scannerActivity">
<FrameLayout
android:id="@+id/scannerInfo"
android:layout_width="408dp"
android:layout_height="567dp">
<SurfaceView
android:id="@+id/camera_view"
android:layout_width="match_parent"
android:layout_height="567dp" />
<View
android:layout_width="200dp"
android:layout_height="200dp"
android:layout_gravity="center"
android:background="@drawable/box_shape" />
</FrameLayout>
<TextView
android:id="@+id/textView9"
android:layout_width="153dp"
android:layout_height="28dp"
android:text="TextView"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.12"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.916"
android:layout_marginTop="580dp"
tools:ignore="MissingConstraints" />
<Button
android:id="@+id/button6"
android:layout_width="74dp"
android:layout_height="38dp"
android:text="Back"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.949"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.973"
android:layout_marginTop="600dp"
android:layout_marginLeft="310dp"/>
<ToggleButton
android:id="@+id/toggleButton"
android:layout_width="101dp"
android:layout_height="76dp"
android:text="ToggleButton"
tools:layout_editor_absoluteX="205dp"
tools:layout_editor_absoluteY="578dp"
tools:ignore="MissingConstraints"
android:backgroundTint="@color/purple_500"
android:layout_marginTop="590dp"
android:layout_marginLeft="180dp"/>
<EditText
android:id="@+id/editTextTextPersonName"
android:layout_width="154dp"
android:layout_height="38dp"
android:ems="10"
android:inputType="textPersonName"
android:text="Name"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.126"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
android:layout_marginTop="610dp"
app:layout_constraintVertical_bias="0.991" />
</RelativeLayout>
这是我得到的错误。我无法理解。它说constraintlayout，但它有RelativeLayout。请帮助我，我是 kotlin 的新手。
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.busconductor/com.example.busconductor.ConductorActivity}: android.view.InflateException: Binary XML file line #8: Error inflating class androidx.constraintlayout.widget.ConstraintLayout
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2325)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Caused by: android.view.InflateException: Binary XML file line #8: Error inflating class androidx.constraintlayout.widget.ConstraintLayout
这是突出显示的行。 this.setContentView(R.layout.activity_conductor)
编辑
activity_conductor_menu.xml
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/back"
tools:context=".conductorMenu">
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Scanner"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="@+id/button4"
app:layout_constraintHorizontal_bias="0.396"
app:layout_constraintStart_toEndOf="@+id/button3"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.924"
tools:ignore="MissingConstraints" />
<Button
android:id="@+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="4dp"
android:layout_marginLeft="4dp"
android:text="City Codes"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.923"
tools:ignore="MissingConstraints" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:fontFamily="fantasy"
android:text="A+ Conductor"
android:textColor="#FF000000"
android:textSize="40sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.519"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.787" />
<Button
android:id="@+id/button4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="4dp"
android:layout_marginRight="4dp"
android:text="LogOut"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.923"
tools:ignore="MissingConstraints" />
<ImageView
android:id="@+id/imageView"
android:layout_width="340dp"
android:layout_height="445dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.619"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.149"
app:srcCompat="@drawable/final_logo_modified"
tools:ignore="MissingConstraints" />
</androidx.constraintlayout.widget.ConstraintLayout>
解决方案
尝试 android:background="@drawable/back"从布局中删除这条线activity_conductor，看看它是否能正常工作..
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