完成了codelabs教程，一切都很好，但在删除ImageCapture用例后，我每隔50毫秒左右就会在logcat中再次出现错误。
以下是所述错误的三行：
07-28 18:22:16.225 211-29468/? E/mm-camera: module_faceproc_port_event_func:886] MCT_EVENT_MODULE_BUF_DIVERT 65539, Cannot start FD, active 10002, frameid 432 431, native 1, mapped 1 1
07-28 18:22:16.258 211-29468/? E/mm-camera: module_faceproc_port_event_func:886] MCT_EVENT_MODULE_BUF_DIVERT 65539, Cannot start FD, active 10002, frameid 433 432, native 1, mapped 1 1
07-28 18:22:16.291 211-29468/? E/mm-camera: module_faceproc_port_event_func:886] MCT_EVENT_MODULE_BUF_DIVERT 65539, Cannot start FD, active 10002, frameid 434 433, native 1, mapped 1 1
我在尝试通过文档实现ImageAnalysis用例时也遇到了同样的错误，其中也没有包括ImageCapture用例。是否有创建文档中缺少的ImageCapture用例的固有要求？
毫米相机标记的错误日志来自哪里？我不容易在代码、文档或谷歌中找到任何东西来告诉我这个毫米相机是什么
以下两种情况的代码。我添加了////////://///////\////////条来突出这两个小差异。
工作代码实验室最终代码：
package jp.oist.cameraxapp
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.Manifest
import android.content.pm.PackageManager
import android.net.Uri
import android.util.Log
import android.widget.Button
import android.widget.Toast
import androidx.core.app.ActivityCompat
import androidx.core.content.ContextCompat
import java.util.concurrent.Executors
import androidx.camera.core.*
import androidx.camera.lifecycle.ProcessCameraProvider
import androidx.camera.view.PreviewView
import kotlinx.android.synthetic.main.activity_main.*
import java.io.File
import java.nio.ByteBuffer
import java.text.SimpleDateFormat
import java.util.*
import java.util.concurrent.ExecutorService
typealias LumaListener = (luma: Double) -> Unit
class MainActivity : AppCompatActivity() {
private var preview: Preview? = null
private var imageCapture: ImageCapture? = null
private var imageAnalyzer: ImageAnalysis? = null
private var camera: Camera? = null
private lateinit var outputDirectory: File
private lateinit var cameraExecutor: ExecutorService
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
// Request camera permissions
if (allPermissionsGranted()) {
startCamera()
} else {
ActivityCompat.requestPermissions(
this, REQUIRED_PERMISSIONS, REQUEST_CODE_PERMISSIONS)
}
// Setup the listener for take photo button
camera_capture_button.setOnClickListener { takePhoto() }
outputDirectory = getOutputDirectory()
cameraExecutor = Executors.newSingleThreadExecutor()
}
private fun startCamera() {
val cameraProviderFuture = ProcessCameraProvider.getInstance(this)
cameraProviderFuture.addListener(Runnable {
// Used to bind the lifecycle of cameras to the lifecycle owner
val cameraProvider: ProcessCameraProvider = cameraProviderFuture.get()
// Preview
preview = Preview.Builder()
.build()
imageCapture = ImageCapture.Builder()
.build()
imageAnalyzer = ImageAnalysis.Builder()
.build()
.also {
it.setAnalyzer(cameraExecutor, LuminosityAnalyzer { luma ->
Log.d(TAG, "Average luminosity: $luma")
})
}
// Select back camera
val cameraSelector = CameraSelector.Builder().requireLensFacing(CameraSelector.LENS_FACING_BACK).build()
try {
// Unbind use cases before rebinding
cameraProvider.unbindAll()
// Bind use cases to camera
camera = cameraProvider.bindToLifecycle(
this, cameraSelector, preview, imageCapture, imageAnalyzer)
preview?.setSurfaceProvider(viewFinder.createSurfaceProvider(camera?.cameraInfo))
} catch(exc: Exception) {
Log.e(TAG, "Use case binding failed", exc)
}
}, ContextCompat.getMainExecutor(this))
}
private fun takePhoto() {
// Get a stable reference of the modifiable image capture use case
val imageCapture = imageCapture ?: return
// Create timestamped output file to hold the image
val photoFile = File(
outputDirectory,
SimpleDateFormat(FILENAME_FORMAT, Locale.US
).format(System.currentTimeMillis()) + ".jpg")
// Create output options object which contains file + metadata
val outputOptions = ImageCapture.OutputFileOptions.Builder(photoFile).build()
// Setup image capture listener which is triggered after photo has
// been taken
imageCapture.takePicture(
outputOptions, ContextCompat.getMainExecutor(this), object : ImageCapture.OnImageSavedCallback {
override fun onError(exc: ImageCaptureException) {
Log.e(TAG, "Photo capture failed: ${exc.message}", exc)
}
override fun onImageSaved(output: ImageCapture.OutputFileResults) {
val savedUri = Uri.fromFile(photoFile)
val msg = "Photo capture succeeded: $savedUri"
Toast.makeText(baseContext, msg, Toast.LENGTH_SHORT).show()
Log.d(TAG, msg)
}
})
}
private fun allPermissionsGranted() = REQUIRED_PERMISSIONS.all {
ContextCompat.checkSelfPermission(
baseContext, it) == PackageManager.PERMISSION_GRANTED
}
fun getOutputDirectory(): File {
val mediaDir = externalMediaDirs.firstOrNull()?.let {
File(it, resources.getString(R.string.app_name)).apply { mkdirs() } }
return if (mediaDir != null && mediaDir.exists())
mediaDir else filesDir
}
companion object {
private const val TAG = "CameraXBasic"
private const val FILENAME_FORMAT = "yyyy-MM-dd-HH-mm-ss-SSS"
private const val REQUEST_CODE_PERMISSIONS = 10
private val REQUIRED_PERMISSIONS = arrayOf(Manifest.permission.CAMERA)
}
override fun onRequestPermissionsResult(
requestCode: Int, permissions: Array<String>, grantResults:
IntArray) {
if (requestCode == REQUEST_CODE_PERMISSIONS) {
if (allPermissionsGranted()) {
startCamera()
} else {
Toast.makeText(this,
"Permissions not granted by the user.",
Toast.LENGTH_SHORT).show()
finish()
}
}
}
private class LuminosityAnalyzer(private val listener: LumaListener) : ImageAnalysis.Analyzer {
private fun ByteBuffer.toByteArray(): ByteArray {
rewind() // Rewind the buffer to zero
val data = ByteArray(remaining())
get(data) // Copy the buffer into a byte array
return data // Return the byte array
}
override fun analyze(image: ImageProxy) {
val buffer = image.planes[0].buffer
val data = buffer.toByteArray()
val pixels = data.map { it.toInt() and 0xFF }
val luma = pixels.average()
listener(luma)
image.close()
}
}
}
用于删除ImageCapture用例的已编辑代码：
package jp.oist.cameraxapp
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.Manifest
import android.content.pm.PackageManager
import android.net.Uri
import android.util.Log
import android.widget.Button
import android.widget.Toast
import androidx.core.app.ActivityCompat
import androidx.core.content.ContextCompat
import java.util.concurrent.Executors
import androidx.camera.core.*
import androidx.camera.lifecycle.ProcessCameraProvider
import androidx.camera.view.PreviewView
import kotlinx.android.synthetic.main.activity_main.*
import java.io.File
import java.nio.ByteBuffer
import java.text.SimpleDateFormat
import java.util.*
import java.util.concurrent.ExecutorService
typealias LumaListener = (luma: Double) -> Unit
class MainActivity : AppCompatActivity() {
private var preview: Preview? = null
private var imageCapture: ImageCapture? = null
private var imageAnalyzer: ImageAnalysis? = null
private var camera: Camera? = null
private lateinit var outputDirectory: File
private lateinit var cameraExecutor: ExecutorService
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
// Request camera permissions
if (allPermissionsGranted()) {
startCamera()
} else {
ActivityCompat.requestPermissions(
this, REQUIRED_PERMISSIONS, REQUEST_CODE_PERMISSIONS)
}
// Setup the listener for take photo button
camera_capture_button.setOnClickListener { takePhoto() }
outputDirectory = getOutputDirectory()
cameraExecutor = Executors.newSingleThreadExecutor()
}
private fun startCamera() {
val cameraProviderFuture = ProcessCameraProvider.getInstance(this)
cameraProviderFuture.addListener(Runnable {
// Used to bind the lifecycle of cameras to the lifecycle owner
val cameraProvider: ProcessCameraProvider = cameraProviderFuture.get()
// Preview
preview = Preview.Builder()
.build()
////////////////////////////////////////// Removed imageCapture object
imageAnalyzer = ImageAnalysis.Builder()
.build()
.also {
it.setAnalyzer(cameraExecutor, LuminosityAnalyzer { luma ->
Log.d(TAG, "Average luminosity: $luma")
})
}
// Select back camera
val cameraSelector = CameraSelector.Builder().requireLensFacing(CameraSelector.LENS_FACING_BACK).build()
try {
// Unbind use cases before rebinding
cameraProvider.unbindAll()
// Bind use cases to camera
////////////////////////////////////////// Removed imageCapture from bindToLifecycle
camera = cameraProvider.bindToLifecycle(
this, cameraSelector, preview, imageAnalyzer)
preview?.setSurfaceProvider(viewFinder.createSurfaceProvider(camera?.cameraInfo))
} catch(exc: Exception) {
Log.e(TAG, "Use case binding failed", exc)
}
}, ContextCompat.getMainExecutor(this))
}
private fun takePhoto() {
// Get a stable reference of the modifiable image capture use case
val imageCapture = imageCapture ?: return
// Create timestamped output file to hold the image
val photoFile = File(
outputDirectory,
SimpleDateFormat(FILENAME_FORMAT, Locale.US
).format(System.currentTimeMillis()) + ".jpg")
// Create output options object which contains file + metadata
val outputOptions = ImageCapture.OutputFileOptions.Builder(photoFile).build()
// Setup image capture listener which is triggered after photo has
// been taken
imageCapture.takePicture(
outputOptions, ContextCompat.getMainExecutor(this), object : ImageCapture.OnImageSavedCallback {
override fun onError(exc: ImageCaptureException) {
Log.e(TAG, "Photo capture failed: ${exc.message}", exc)
}
override fun onImageSaved(output: ImageCapture.OutputFileResults) {
val savedUri = Uri.fromFile(photoFile)
val msg = "Photo capture succeeded: $savedUri"
Toast.makeText(baseContext, msg, Toast.LENGTH_SHORT).show()
Log.d(TAG, msg)
}
})
}
private fun allPermissionsGranted() = REQUIRED_PERMISSIONS.all {
ContextCompat.checkSelfPermission(
baseContext, it) == PackageManager.PERMISSION_GRANTED
}
fun getOutputDirectory(): File {
val mediaDir = externalMediaDirs.firstOrNull()?.let {
File(it, resources.getString(R.string.app_name)).apply { mkdirs() } }
return if (mediaDir != null && mediaDir.exists())
mediaDir else filesDir
}
companion object {
private const val TAG = "CameraXBasic"
private const val FILENAME_FORMAT = "yyyy-MM-dd-HH-mm-ss-SSS"
private const val REQUEST_CODE_PERMISSIONS = 10
private val REQUIRED_PERMISSIONS = arrayOf(Manifest.permission.CAMERA)
}
override fun onRequestPermissionsResult(
requestCode: Int, permissions: Array<String>, grantResults:
IntArray) {
if (requestCode == REQUEST_CODE_PERMISSIONS) {
if (allPermissionsGranted()) {
startCamera()
} else {
Toast.makeText(this,
"Permissions not granted by the user.",
Toast.LENGTH_SHORT).show()
finish()
}
}
}
private class LuminosityAnalyzer(private val listener: LumaListener) : ImageAnalysis.Analyzer {
private fun ByteBuffer.toByteArray(): ByteArray {
rewind() // Rewind the buffer to zero
val data = ByteArray(remaining())
get(data) // Copy the buffer into a byte array
return data // Return the byte array
}
override fun analyze(image: ImageProxy) {
val buffer = image.planes[0].buffer
val data = buffer.toByteArray()
val pixels = data.map { it.toInt() and 0xFF }
val luma = pixels.average()
listener(luma)
image.close()
}
}
}
内部版本和电话详细信息：
Nexus 5，安卓6.0.1
Android Studio 4.0构建号AI-193.6911.18.40.6514223，构建于2020年5月21日运行时版本：1.8.0_224-release-1644-b3-6222593 amd64虚拟机：JetBrains s.r.o的OpenJDK 64位服务器虚拟机Linux 5.3.0-46通用GC：ParNew，ConcurrentMarkSweep内存：1981M核心：8注册表：ide.new.welcome.screen.force=true非绑定插件：PlantUML集成、SequenceDiagram、org.getbrains.kotlin、com.google.services.firebase、com.intellij.marketplace、com.thinkworks.gauge、org.intellij.Plugins.markdown、org.mesmeur.sketchit、ru.leoklo.stackkuml、simpleUML
Edit1(添加表现出相同行为的Java示例代码)：
我想添加另一个导致相同logcat错误的示例。按照示例代码片段并填补文档中的空白，在完成文档的Preview部分时，可以得到以下代码，并使用一个有效的Preview用例：
package jp.oist.cameraxapp;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.camera.core.Camera;
import androidx.camera.core.CameraSelector;
import androidx.camera.core.ImageAnalysis;
import androidx.camera.core.ImageCapture;
import androidx.camera.core.ImageProxy;
import androidx.camera.core.Preview;
import androidx.camera.lifecycle.ProcessCameraProvider;
import androidx.camera.view.PreviewView;
import androidx.core.content.ContextCompat;
import androidx.lifecycle.LifecycleOwner;
import android.os.Bundle;
import android.util.Log;
import android.util.Size;
import com.google.common.util.concurrent.ListenableFuture;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Executor;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
public class MainActivity extends AppCompatActivity {
private ImageCapture imageCapture;
private ListenableFuture<ProcessCameraProvider> cameraProviderFuture;
// private ExecutorService executor;
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// executor = Executors.newSingleThreadExecutor();
PreviewView previewView = findViewById(R.id.previewView);
cameraProviderFuture = ProcessCameraProvider.getInstance(this);
cameraProviderFuture.addListener(() -> {
try {
// Camera provider is now guaranteed to be available
ProcessCameraProvider cameraProvider = cameraProviderFuture.get();
// Set up the view finder use case to display camera preview
Preview preview = new Preview.Builder().build();
// Choose the camera by requiring a lens facing
CameraSelector cameraSelector = new CameraSelector.Builder()
.requireLensFacing(CameraSelector.LENS_FACING_FRONT)
.build();
// Connect the preview use case to the previewView
preview.setSurfaceProvider(
previewView.createSurfaceProvider());
// Set up the capture use case to allow users to take photos
// imageCapture = new ImageCapture.Builder()
// .setCaptureMode(ImageCapture.CAPTURE_MODE_MINIMIZE_LATENCY)
// .build();
// ImageAnalysis imageAnalysis =
// new ImageAnalysis.Builder()
// .setTargetResolution(new Size(1280, 720))
// .setBackpressureStrategy(ImageAnalysis.STRATEGY_KEEP_ONLY_LATEST)
// .build();
//
// imageAnalysis.setAnalyzer(executor, new ImageAnalysis.Analyzer() {
// @Override
// public void analyze(@NonNull ImageProxy image) {
// int rotationDegrees = image.getImageInfo().getRotationDegrees();
// Log.i("CameraXApp3", "Image Analyzed");
// }
// });
// Attach use cases to the camera with the same lifecycle owner
Camera camera = cameraProvider.bindToLifecycle(
((LifecycleOwner) this),
cameraSelector,
preview);
} catch (InterruptedException | ExecutionException e) {
// Currently no exceptions thrown. cameraProviderFuture.get() should
// not block since the listener is being called, so no need to
// handle InterruptedException.
}
}, ContextCompat.getMainExecutor(this));
}
}
这工作得很好，没有logcat错误。我将在末尾添加清单和布局XML，因为它是相同的，但将此代码与下面的代码进行比较，下面的代码只是取消注释几行，以添加一个空的ImageAnalyzer和所需的执行器：
package jp.oist.cameraxapp;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.camera.core.Camera;
import androidx.camera.core.CameraSelector;
import androidx.camera.core.ImageAnalysis;
import androidx.camera.core.ImageCapture;
import androidx.camera.core.ImageProxy;
import androidx.camera.core.Preview;
import androidx.camera.lifecycle.ProcessCameraProvider;
import androidx.camera.view.PreviewView;
import androidx.core.content.ContextCompat;
import androidx.lifecycle.LifecycleOwner;
import android.os.Bundle;
import android.util.Log;
import android.util.Size;
import com.google.common.util.concurrent.ListenableFuture;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Executor;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
public class MainActivity extends AppCompatActivity {
private ImageCapture imageCapture;
private ListenableFuture<ProcessCameraProvider> cameraProviderFuture;
private ExecutorService executor;
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
executor = Executors.newSingleThreadExecutor();
PreviewView previewView = findViewById(R.id.previewView);
cameraProviderFuture = ProcessCameraProvider.getInstance(this);
cameraProviderFuture.addListener(() -> {
try {
// Camera provider is now guaranteed to be available
ProcessCameraProvider cameraProvider = cameraProviderFuture.get();
// Set up the view finder use case to display camera preview
Preview preview = new Preview.Builder().build();
// Choose the camera by requiring a lens facing
CameraSelector cameraSelector = new CameraSelector.Builder()
.requireLensFacing(CameraSelector.LENS_FACING_FRONT)
.build();
// Connect the preview use case to the previewView
preview.setSurfaceProvider(
previewView.createSurfaceProvider());
// Set up the capture use case to allow users to take photos
// imageCapture = new ImageCapture.Builder()
// .setCaptureMode(ImageCapture.CAPTURE_MODE_MINIMIZE_LATENCY)
// .build();
ImageAnalysis imageAnalysis =
new ImageAnalysis.Builder()
.setTargetResolution(new Size(1280, 720))
.setBackpressureStrategy(ImageAnalysis.STRATEGY_KEEP_ONLY_LATEST)
.build();
imageAnalysis.setAnalyzer(executor, new ImageAnalysis.Analyzer() {
@Override
public void analyze(@NonNull ImageProxy image) {
int rotationDegrees = image.getImageInfo().getRotationDegrees();
Log.i("CameraXApp3", "Image Analyzed");
}
});
// Attach use cases to the camera with the same lifecycle owner
Camera camera = cameraProvider.bindToLifecycle(
((LifecycleOwner) this),
cameraSelector,
preview,
imageAnalysis);
} catch (InterruptedException | ExecutionException e) {
// Currently no exceptions thrown. cameraProviderFuture.get() should
// not block since the listener is being called, so no need to
// handle InterruptedException.
}
}, ContextCompat.getMainExecutor(this));
}
}
这会产生与codelabs示例代码中相同的logcat错误：
07-28 18:22:16.225 211-29468/? E/mm-camera: module_faceproc_port_event_func:886] MCT_EVENT_MODULE_BUF_DIVERT 65539, Cannot start FD, active 10002, frameid 432 431, native 1, mapped 1 1
07-28 18:22:16.258 211-29468/? E/mm-camera: module_faceproc_port_event_func:886] MCT_EVENT_MODULE_BUF_DIVERT 65539, Cannot start FD, active 10002, frameid 433 432, native 1, mapped 1 1
07-28 18:22:16.291 211-29468/? E/mm-camera: module_faceproc_port_event_func:886] MCT_EVENT_MODULE_BUF_DIVERT 65539, Cannot start FD, active 10002, frameid 434 433, native 1, mapped 1 1
看来imageAnalysis对象的创建本身并没有创建它，因为我可以保持代码的原样，但只需从bindToLifecycle()调用中删除imageAnalysis对象，这个错误就会消失。我的猜测是，我在绑定到imageAnalysis对象的执行器和cameraProvider的生命周期之间设置了一些错误。我对这两个概念都很陌生，所以我在这方面的无知是我怀疑这个问题的唯一原因(因为我没有正确理解它)。我能在这里做出明显的拒绝吗？
在下面布局XML和清单：
<?xml version="1.0" encoding="utf-8"?>
<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"
tools:context=".MainActivity">
<FrameLayout
android:id="@+id/container"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent">
<androidx.camera.view.PreviewView
android:id="@+id/previewView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"/>
</FrameLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="jp.oist.cameraxapp">
<uses-feature android:name="android.hardware.camera.any" />
<uses-permission android:name="android.permission.CAMERA" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
TLDR
看起来像是与任何mlkit包相关的bug或有限功能<16.2.0.将你的应用级gradle文件中的任何mlkit实现更新为16.2.0以上的版本(尽管这些版本还不适用于几个包)：
// implementation 'com.google.mlkit:object-detection:16.1.0'
// implementation 'com.google.mlkit:object-detection:16.2.0'
详尽的解释
在我的应用程序级gradle文件中将com.google.mlkit:object-detection:16.1.0包更新为com.google.mlkit:object-detection:16.2.0，可以可靠地消除错误。
突出显示有问题的代码：
// ------------------Error Start------------------
implementation 'com.google.mlkit:object-detection:16.2.0'
// ------------------Error End------------------
生成渐变文件时出现完全错误
apply plugin: 'com.android.application'
android {
compileSdkVersion 29
buildToolsVersion "30.0.0"
defaultConfig {
applicationId "jp.oist.cameraxapp"
minSdkVersion 21
targetSdkVersion 29
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
}
dependencies {
implementation fileTree(dir: "libs", include: ["*.jar"])
implementation 'androidx.appcompat:appcompat:1.1.0'
implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
implementation 'androidx.camera:camera-camera2:1.0.0-beta07'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'androidx.test.ext:junit:1.1.1'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
// CameraX core library using the camera2 implementation
def camerax_version = "1.0.0-beta07"
// The following line is optional, as the core library is included indirectly by camera-camera2
implementation "androidx.camera:camera-core:${camerax_version}"
implementation "androidx.camera:camera-camera2:${camerax_version}"
// If you want to additionally use the CameraX Lifecycle library
implementation "androidx.camera:camera-lifecycle:${camerax_version}"
// If you want to additionally use the CameraX View class
implementation "androidx.camera:camera-view:1.0.0-alpha14"
// If you want to additionally use the CameraX Extensions library
// implementation "androidx.camera:camera-extensions:1.0.0-alpha14"
// ------------------Error Start------------------
implementation 'com.google.mlkit:object-detection:16.1.0'
// ------------------Error End------------------
// implementation 'com.google.mlkit:face-detection:16.0.1'
// implementation 'com.google.mlkit:barcode-scanning:16.0.1'
}
完全无错误渐变文件
apply plugin: 'com.android.application'
android {
compileSdkVersion 29
buildToolsVersion "30.0.0"
defaultConfig {
applicationId "jp.oist.cameraxapp"
minSdkVersion 21
targetSdkVersion 29
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
}
dependencies {
implementation fileTree(dir: "libs", include: ["*.jar"])
implementation 'androidx.appcompat:appcompat:1.1.0'
implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
implementation 'androidx.camera:camera-camera2:1.0.0-beta07'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'androidx.test.ext:junit:1.1.1'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
// CameraX core library using the camera2 implementation
def camerax_version = "1.0.0-beta07"
// The following line is optional, as the core library is included indirectly by camera-camera2
implementation "androidx.camera:camera-core:${camerax_version}"
implementation "androidx.camera:camera-camera2:${camerax_version}"
// If you want to additionally use the CameraX Lifecycle library
implementation "androidx.camera:camera-lifecycle:${camerax_version}"
// If you want to additionally use the CameraX View class
implementation "androidx.camera:camera-view:1.0.0-alpha14"
// If you want to additionally use the CameraX Extensions library
// implementation "androidx.camera:camera-extensions:1.0.0-alpha14"
// ------------------Error Start------------------
implementation 'com.google.mlkit:object-detection:16.2.0'
// ------------------Error End------------------
// implementation 'com.google.mlkit:face-detection:16.0.1'
// implementation 'com.google.mlkit:barcode-scanning:16.0.1'
}
令人惊讶的是，我的MainActivity.java文件中没有任何mlkit包的直接依赖项，项目中也没有其他java文件。这些实现只是为了稍后在代码的ImageAnalysis部分中使用它们，但尚未实现。
这可能与这里提到的自定义执行器有关。
在Android上，添加了对指定自己的自定义执行器的支持，以运行昂贵的任务，如图像标签和对象检测与跟踪的模型加载和推理。有了这个版本，所有ML Kit API现在都支持自定义执行器。
默认情况下，ML Kit使用高度优化的内部管理线程池来运行后台任务。这个API可以帮助开发人员在特定的用例中保持对应用程序中线程的完全控制。
因为我使用了这样一个执行器，但我不确定如何使用"；内部管理线程池"；提到。此外，由于我在当前代码中没有直接依赖于任何mlkit包，我不知道mlkit包最初是如何生成这些logcat错误的，但现在已经存在了。如果你有任何错误，请添加更好的答案或注释以提供见解！
是否也有创建ImageCapture使用的固有要求我在文件中找不到的案子？
不，没有。您可以使用预览和图像分析自己没有和图像捕获用例。您可以从文档中查看本节末尾的表中支持的用例组合。
mm摄像头标记的错误日志来自哪里？
它不是CameraX日志，很可能是来自相机框架/HAL的日志。您可以在代码搜索中找到对它的引用。