feat: 添加 USB 摄像头连接功能
- 新增 Android USB 摄像头 APP (MJPEG 服务器) - 电脑端支持 ADB 端口转发连接 - 修复 .gitignore 忽略 Android 文件 Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
let5sne.win10
26
android-app/app/src/main/AndroidManifest.xml
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26
android-app/app/src/main/AndroidManifest.xml
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<?xml version="1.0" encoding="utf-8"?>
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<manifest xmlns:android="http://schemas.android.com/apk/res/android"
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xmlns:tools="http://schemas.android.com/tools">
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<uses-feature android:name="android.hardware.camera.any" />
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<uses-permission android:name="android.permission.CAMERA" />
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<uses-permission android:name="android.permission.INTERNET" />
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<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
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<application
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android:allowBackup="true"
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android:label="USB摄像头"
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android:theme="@style/Theme.AppCompat.NoActionBar">
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<activity
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android:name=".MainActivity"
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android:exported="true"
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android:screenOrientation="landscape"
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android:keepScreenOn="true">
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<intent-filter>
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<action android:name="android.intent.action.MAIN" />
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<category android:name="android.intent.category.LAUNCHER" />
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</intent-filter>
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</activity>
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</application>
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</manifest>
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159
android-app/app/src/main/java/com/usbwebcam/CameraHelper.kt
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159
android-app/app/src/main/java/com/usbwebcam/CameraHelper.kt
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package com.usbwebcam
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import android.content.Context
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import android.graphics.Bitmap
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import android.graphics.ImageFormat
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import android.graphics.Rect
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import android.graphics.YuvImage
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import android.hardware.camera2.*
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import android.media.Image
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import android.media.ImageReader
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import android.os.Handler
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import android.os.HandlerThread
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import android.util.Size
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import android.view.Surface
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import android.view.SurfaceHolder
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import java.io.ByteArrayOutputStream
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import java.io.File
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import java.io.FileOutputStream
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import java.text.SimpleDateFormat
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import java.util.*
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class CameraHelper(
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private val context: Context,
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private val onFrame: (ByteArray, Int, Int) -> Unit
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) {
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private var cameraDevice: CameraDevice? = null
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private var captureSession: CameraCaptureSession? = null
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private var imageReader: ImageReader? = null
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private var backgroundThread: HandlerThread? = null
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private var backgroundHandler: Handler? = null
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private val cameraManager = context.getSystemService(Context.CAMERA_SERVICE) as CameraManager
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private val cameraId = cameraManager.cameraIdList.firstOrNull {
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cameraManager.getCameraCharacteristics(it)
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.get(CameraCharacteristics.LENS_FACING) == CameraCharacteristics.LENS_FACING_BACK
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} ?: cameraManager.cameraIdList.first()
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fun start() {
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startBackgroundThread()
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openCamera()
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}
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fun stop() {
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closeCamera()
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stopBackgroundThread()
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}
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private fun startBackgroundThread() {
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backgroundThread = HandlerThread("CameraBackground").apply {
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start()
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backgroundHandler = Handler(looper)
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}
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}
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private fun stopBackgroundThread() {
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backgroundThread?.quitSafely()
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backgroundThread?.join()
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backgroundThread = null
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backgroundHandler = null
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}
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private fun openCamera() {
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try {
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cameraManager.openCamera(cameraId, object : CameraDevice.StateCallback() {
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override fun onOpened(camera: CameraDevice) {
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cameraDevice = camera
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createCameraPreviewSession()
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}
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override fun onDisconnected(camera: CameraDevice) {
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camera.close()
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cameraDevice = null
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}
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override fun onError(camera: CameraDevice, error: Int) {
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camera.close()
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cameraDevice = null
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}
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}, backgroundHandler!!)
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} catch (e: SecurityException) {
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e.printStackTrace()
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}
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}
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private fun createCameraPreviewSession() {
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try {
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// 获取支持的尺寸
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val characteristics = cameraManager.getCameraCharacteristics(cameraId)
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val map = characteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP)
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val previewSize = map?.getOutputSizes(SurfaceHolder::class.java)?.firstOrNull {
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it.width <= 1280 && it.height <= 720
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} ?: Size(1280, 720)
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imageReader = ImageReader.newInstance(previewSize.width, previewSize.height, ImageFormat.JPEG, 2)
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imageReader?.setOnImageAvailableListener(imageAvailableListener, backgroundHandler)
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val captureRequest = cameraDevice?.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW)?.apply {
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addTarget(imageReader!!.surface)
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set(CaptureRequest.CONTROL_AF_MODE, CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE)
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set(CaptureRequest.CONTROL_AE_MODE, CaptureRequest.CONTROL_AE_MODE_ON)
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}
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cameraDevice?.createCaptureSession(
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listOf(imageReader!!.surface),
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object : CameraCaptureSession.StateCallback() {
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override fun onConfigured(session: CameraCaptureSession) {
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captureSession = session
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captureRequest?.let {
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session.setRepeatingRequest(it.build(), null, backgroundHandler)
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}
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}
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override fun onConfigureFailed(session: CameraCaptureSession) {}
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},
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backgroundHandler
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)
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} catch (e: Exception) {
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e.printStackTrace()
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}
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}
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private val imageAvailableListener = ImageReader.OnImageAvailableListener { reader ->
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val image = reader.acquireLatestImage() ?: return@OnImageAvailableListener
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try {
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val buffer = image.planes[0].buffer
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val bytes = ByteArray(buffer.remaining())
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buffer.get(bytes)
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onFrame(bytes, image.width, image.height)
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} finally {
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image.close()
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}
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}
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fun captureAndSave() {
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// 保存最后一帧
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imageReader?.acquireLatestImage()?.use { image ->
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val buffer = image.planes[0].buffer
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val bytes = ByteArray(buffer.remaining())
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buffer.get(bytes)
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val timestamp = SimpleDateFormat("yyyyMMdd_HHmmss", Locale.getDefault()).format(Date())
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val file = File(
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context.getExternalFilesDir(null),
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"envelope_$timestamp.jpg"
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)
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FileOutputStream(file).use { it.write(bytes) }
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}
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}
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private fun closeCamera() {
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captureSession?.close()
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captureSession = null
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imageReader?.close()
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imageReader = null
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cameraDevice?.close()
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cameraDevice = null
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}
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}
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101
android-app/app/src/main/java/com/usbwebcam/MainActivity.kt
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101
android-app/app/src/main/java/com/usbwebcam/MainActivity.kt
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@@ -0,0 +1,101 @@
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package com.usbwebcam
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import android.Manifest
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import android.content.pm.PackageManager
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import android.os.Bundle
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import android.widget.Button
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import android.widget.TextView
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import android.widget.Toast
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import androidx.activity.result.contract.ActivityResultContracts
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import androidx.appcompat.app.AppCompatActivity
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import androidx.core.content.ContextCompat
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class MainActivity : AppCompatActivity() {
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private var mjpegServer: MjpegServer? = null
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private var cameraHelper: CameraHelper? = null
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private val requestPermissionLauncher = registerForActivityResult(
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ActivityResultContracts.RequestPermission()
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) { isGranted ->
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if (isGranted) {
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startCamera()
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} else {
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Toast.makeText(this, "需要相机权限", Toast.LENGTH_LONG).show()
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}
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}
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override fun onCreate(savedInstanceState: Bundle?) {
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super.onCreate(savedInstanceState)
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setContentView(R.layout.activity_main)
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val btnStart = findViewById<Button>(R.id.btn_start)
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val btnStop = findViewById<Button>(R.id.btn_stop)
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val btnCapture = findViewById<Button>(R.id.btn_capture)
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val tvStatus = findViewById<TextView>(R.id.tv_status)
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btnStart.setOnClickListener {
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if (checkPermission()) {
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startCamera()
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}
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}
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btnStop.setOnClickListener {
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stopCamera()
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}
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btnCapture.setOnClickListener {
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cameraHelper?.captureAndSave()
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Toast.makeText(this, "图片已保存到相册", Toast.LENGTH_SHORT).show()
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}
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// 自动启动
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if (checkPermission()) {
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startCamera()
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}
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}
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private fun checkPermission(): Boolean {
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return if (ContextCompat.checkSelfPermission(
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this,
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Manifest.permission.CAMERA
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) == PackageManager.PERMISSION_GRANTED
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) {
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true
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} else {
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requestPermissionLauncher.launch(Manifest.permission.CAMERA)
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false
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}
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}
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private fun startCamera() {
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cameraHelper = CameraHelper(this) { frame, _, _ ->
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mjpegServer?.updateFrame(frame)
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}
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mjpegServer = MjpegServer(8080)
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mjpegServer?.start {
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runOnUiThread {
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findViewById<TextView>(R.id.tv_status).text =
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"服务运行中端口: 8080IP: 无需IP (ADB模式)USB连接命令:adb forward tcp:8080 tcp:8080"
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findViewById<Button>(R.id.btn_start).isEnabled = false
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findViewById<Button>(R.id.btn_stop).isEnabled = true
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}
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}
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cameraHelper?.start()
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}
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private fun stopCamera() {
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cameraHelper?.stop()
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mjpegServer?.stop()
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findViewById<TextView>(R.id.tv_status).text = "服务已停止"
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findViewById<Button>(R.id.btn_start).isEnabled = true
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findViewById<Button>(R.id.btn_stop).isEnabled = false
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}
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override fun onDestroy() {
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super.onDestroy()
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stopCamera()
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}
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}
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150
android-app/app/src/main/java/com/usbwebcam/MjpegServer.kt
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150
android-app/app/src/main/java/com/usbwebcam/MjpegServer.kt
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@@ -0,0 +1,150 @@
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package com.usbwebcam
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import java.io.OutputStream
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import java.net.ServerSocket
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import java.net.Socket
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import java.util.concurrent.CopyOnWriteArrayList
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import java.util.concurrent.atomic.AtomicBoolean
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class MjpegServer(private val port: Int) {
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private var serverSocket: ServerSocket? = null
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private var serverThread: Thread? = null
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private val clients = CopyOnWriteArrayList<ClientHandler>()
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private val running = AtomicBoolean(false)
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private var currentFrame: ByteArray? = null
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private val frameLock = Any()
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fun start(onStarted: () -> Unit) {
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serverThread = Thread {
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try {
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serverSocket = ServerSocket(port)
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running.set(true)
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onStarted()
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while (running.get()) {
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val client = try {
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serverSocket?.accept()
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} catch (e: Exception) {
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null
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} ?: continue
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val handler = ClientHandler(client)
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clients.add(handler)
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handler.start()
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// 发送当前帧
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val frameToSend = synchronized(frameLock) {
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currentFrame
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}
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if (frameToSend != null) {
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handler.sendFrame(frameToSend)
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}
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}
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} catch (e: Exception) {
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if (running.get()) {
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e.printStackTrace()
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}
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}
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}.apply {
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name = "MjpegServerThread"
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start()
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}
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}
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fun updateFrame(frame: ByteArray) {
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synchronized(frameLock) {
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currentFrame = frame
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}
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// 广播给所有客户端
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val iterator = clients.iterator()
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while (iterator.hasNext()) {
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val handler = iterator.next()
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if (handler.isSocketActive()) {
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handler.sendFrame(frame)
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} else {
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iterator.remove()
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}
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}
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}
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fun stop() {
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if (!running.getAndSet(false)) return
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try {
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serverSocket?.close()
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} catch (e: Exception) {
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// ignore
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}
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clients.forEach { it.close() }
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clients.clear()
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serverSocket = null
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}
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private class ClientHandler(private val socket: Socket) : Thread() {
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private var clientStream: OutputStream? = null
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@Volatile
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private var initialized = false
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override fun run() {
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try {
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val os = socket.getOutputStream()
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clientStream = os
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socket.setSoTimeout(5000)
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// 读取HTTP请求 (清空缓冲区)
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val buffer = ByteArray(1024)
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socket.getInputStream().read(buffer)
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// 发送MJPEG流头 - 正确的HTTP格式
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val header = byteArrayOf(
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*("HTTP/1.1 200 OK\r\n").toByteArray(),
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*("Content-Type: multipart/x-mixed-replace; boundary=boundary\r\n").toByteArray(),
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*("Cache-Control: no-cache\r\n").toByteArray(),
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*("Connection: close\r\n").toByteArray(),
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*("\r\n").toByteArray() // 空行表示header结束
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)
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os.write(header)
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os.flush()
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initialized = true
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} catch (e: Exception) {
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close()
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}
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}
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fun sendFrame(frame: ByteArray) {
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if (!initialized || clientStream == null) return
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try {
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// MJPEG frame header with \r\n
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val header = byteArrayOf(
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*("--boundary\r\n").toByteArray(),
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*("Content-Type: image/jpeg\r\n").toByteArray(),
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*("Content-Length: ${frame.size}\r\n").toByteArray(),
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*("\r\n").toByteArray()
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)
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clientStream?.write(header)
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clientStream?.write(frame)
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clientStream?.write(("\r\n").toByteArray())
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clientStream?.flush()
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} catch (e: Exception) {
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close()
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}
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}
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fun close() {
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try {
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socket.close()
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} catch (e: Exception) {
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e.printStackTrace()
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}
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}
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fun isSocketActive(): Boolean {
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return !socket.isClosed && socket.isConnected
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}
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}
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}
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51
android-app/app/src/main/res/layout/activity_main.xml
Normal file
51
android-app/app/src/main/res/layout/activity_main.xml
Normal file
@@ -0,0 +1,51 @@
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<?xml version="1.0" encoding="utf-8"?>
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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
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android:layout_width="match_parent"
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android:layout_height="match_parent"
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android:orientation="vertical"
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android:padding="24dp"
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android:gravity="center">
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<TextView
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android:id="@+id/tv_status"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:text="等待启动..."
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android:textSize="16sp"
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android:textColor="#333"
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android:layout_marginBottom="32dp" />
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<LinearLayout
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:orientation="horizontal"
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android:gravity="center">
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<Button
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android:id="@+id/btn_start"
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android:layout_width="120dp"
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android:layout_height="60dp"
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android:text="启动"
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android:textSize="18sp"
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android:layout_marginEnd="16dp" />
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<Button
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android:id="@+id/btn_stop"
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android:layout_width="120dp"
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android:layout_height="60dp"
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android:text="停止"
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android:textSize="18sp"
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android:enabled="false" />
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</LinearLayout>
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<Button
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android:id="@+id/btn_capture"
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android:layout_width="200dp"
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android:layout_height="70dp"
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android:text="拍照保存"
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android:textSize="20sp"
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android:layout_marginTop="24dp"
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android:backgroundTint="#4CAF50" />
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</LinearLayout>
|
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Reference in New Issue
Block a user