实时视频UI
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@@ -75,7 +75,7 @@ class HomeMenuFragment : Fragment() {
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startActivity(intent)
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}
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binding.addFamily.setOnClickListener {
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val intent = Intent(requireContext(), AddFamilyActivity::class.java)
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val intent = Intent(requireContext(), ScanActivity::class.java)
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startActivity(intent)
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}
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}
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@@ -0,0 +1,291 @@
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package com.example.defenseapplication.home
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import android.Manifest
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import android.content.Intent
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import android.content.pm.PackageManager
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import android.graphics.ImageFormat
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import android.graphics.Matrix
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import android.graphics.RectF
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import android.graphics.SurfaceTexture
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import android.hardware.Camera
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import android.os.Bundle
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import android.os.Handler
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import android.os.Looper
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import android.provider.MediaStore
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import android.view.SurfaceHolder
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import android.view.SurfaceView
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import android.view.View
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import android.view.animation.Animation
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import android.view.animation.LinearInterpolator
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import android.view.animation.TranslateAnimation
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import android.widget.Toast
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import androidx.appcompat.app.AppCompatActivity
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import androidx.core.app.ActivityCompat
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import androidx.core.content.ContextCompat
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import com.example.defenseapplication.R
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import com.example.defenseapplication.databinding.ScanActivityBinding
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import com.google.zxing.*
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import com.google.zxing.common.HybridBinarizer
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import java.util.*
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class ScanActivity : AppCompatActivity(), SurfaceHolder.Callback {
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private lateinit var binding: ScanActivityBinding
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private var camera: Camera? = null
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private var isFlashlightOn = false
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private var scanHandler: Handler? = null
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private var scanRunnable: Runnable? = null
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private val REQUEST_CODE_CAMERA = 100
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private val REQUEST_CODE_ALBUM = 101
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override fun onCreate(savedInstanceState: Bundle?) {
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super.onCreate(savedInstanceState)
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binding = ScanActivityBinding.inflate(layoutInflater)
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setContentView(binding.root)
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initView()
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initListener()
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startScanLineAnimation()
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}
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private fun initView() {
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binding.surfaceView.holder.addCallback(this)
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}
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private fun initListener() {
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binding.btnBack.setOnClickListener {
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finish()
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}
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binding.llAlbum.setOnClickListener {
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openAlbum()
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}
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binding.llFlashlight.setOnClickListener {
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toggleFlashlight()
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}
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}
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private fun startScanLineAnimation() {
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val animation = TranslateAnimation(
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Animation.RELATIVE_TO_PARENT, 0f,
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Animation.RELATIVE_TO_PARENT, 0f,
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Animation.RELATIVE_TO_PARENT, 0f,
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Animation.RELATIVE_TO_PARENT, 1f
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)
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animation.duration = 2000
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animation.repeatCount = Animation.INFINITE
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animation.interpolator = LinearInterpolator()
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binding.scanLine.startAnimation(animation)
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}
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private fun openAlbum() {
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val intent = Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI)
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startActivityForResult(intent, REQUEST_CODE_ALBUM)
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}
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private fun toggleFlashlight() {
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if (camera == null) {
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Toast.makeText(this, "相机未准备好", Toast.LENGTH_SHORT).show()
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return
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}
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isFlashlightOn = !isFlashlightOn
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val params = camera?.parameters
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if (isFlashlightOn) {
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params?.flashMode = Camera.Parameters.FLASH_MODE_TORCH
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binding.ivFlashlight.setColorFilter(ContextCompat.getColor(this, R.color.green))
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} else {
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params?.flashMode = Camera.Parameters.FLASH_MODE_OFF
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binding.ivFlashlight.clearColorFilter()
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}
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camera?.parameters = params
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}
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private fun checkCameraPermission(): Boolean {
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return 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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private fun requestCameraPermission() {
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ActivityCompat.requestPermissions(
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this,
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arrayOf(Manifest.permission.CAMERA),
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REQUEST_CODE_CAMERA
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)
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}
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private fun openCamera() {
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if (!checkCameraPermission()) {
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requestCameraPermission()
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return
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}
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try {
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camera = Camera.open()
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camera?.setDisplayOrientation(90)
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val params = camera?.parameters
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params?.previewFormat = ImageFormat.NV21
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val sizes = params?.supportedPreviewSizes
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val optimalSize = getOptimalPreviewSize(sizes, binding.surfaceView.width, binding.surfaceView.height)
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if (optimalSize != null) {
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params?.setPreviewSize(optimalSize.width, optimalSize.height)
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}
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camera?.parameters = params
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camera?.setPreviewDisplay(binding.surfaceView.holder)
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camera?.startPreview()
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startScanDecode()
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} catch (e: Exception) {
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Toast.makeText(this, "无法打开相机", Toast.LENGTH_SHORT).show()
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}
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}
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private fun getOptimalPreviewSize(sizes: List<Camera.Size>?, w: Int, h: Int): Camera.Size? {
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if (sizes == null) return null
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var optimalSize: Camera.Size? = null
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val targetRatio = h.toDouble() / w.toDouble()
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for (size in sizes) {
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val ratio = size.width.toDouble() / size.height.toDouble()
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if (Math.abs(ratio - targetRatio) < 0.01) {
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optimalSize = size
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break
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}
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}
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if (optimalSize == null) {
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var minDiff = Int.MAX_VALUE
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for (size in sizes) {
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val diff = Math.abs(size.width - w) + Math.abs(size.height - h)
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if (diff < minDiff) {
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optimalSize = size
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minDiff = diff
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}
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}
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}
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return optimalSize
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}
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private fun startScanDecode() {
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scanHandler = Handler(Looper.getMainLooper())
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scanRunnable = object : Runnable {
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override fun run() {
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decodeQRCode()
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scanHandler?.postDelayed(this, 100)
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}
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}
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scanHandler?.post(scanRunnable!!)
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}
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private fun decodeQRCode() {
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if (camera == null) return
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try {
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val parameters = camera?.parameters
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val size = parameters?.previewSize
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if (size == null) return
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val data = ByteArray(size.width * size.height * 3 / 2)
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camera?.setOneShotPreviewCallback { bytes, _ ->
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val source = PlanarYUVLuminanceSource(
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bytes, size.width, size.height, 0, 0,
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size.width, size.height, false
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)
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val binarizer = HybridBinarizer(source)
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val bitmap = BinaryBitmap(binarizer)
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val reader = MultiFormatReader()
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val hints = Hashtable<DecodeHintType, Any>()
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hints[DecodeHintType.CHARACTER_SET] = "UTF-8"
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reader.setHints(hints)
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try {
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val result = reader.decode(bitmap)
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handleScanResult(result.text)
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} catch (e: Exception) {
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}
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}
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} catch (e: Exception) {
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}
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}
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private fun handleScanResult(result: String) {
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stopScanDecode()
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camera?.stopPreview()
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Toast.makeText(this, "扫描结果: $result", Toast.LENGTH_SHORT).show()
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val intent = Intent(this, AddFamilyActivity::class.java)
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intent.putExtra("device_code", result)
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startActivity(intent)
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finish()
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}
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private fun stopScanDecode() {
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scanRunnable?.let { scanHandler?.removeCallbacks(it) }
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scanHandler = null
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scanRunnable = null
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}
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override fun surfaceCreated(holder: SurfaceHolder) {
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openCamera()
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}
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override fun surfaceChanged(holder: SurfaceHolder, format: Int, width: Int, height: Int) {
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if (camera != null) {
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camera?.stopPreview()
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try {
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camera?.setPreviewDisplay(holder)
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camera?.startPreview()
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} catch (e: Exception) {
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}
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}
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}
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override fun surfaceDestroyed(holder: SurfaceHolder) {
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stopScanDecode()
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camera?.stopPreview()
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camera?.release()
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camera = null
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}
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override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<String>, grantResults: IntArray) {
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super.onRequestPermissionsResult(requestCode, permissions, grantResults)
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if (requestCode == REQUEST_CODE_CAMERA) {
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if (grantResults.isNotEmpty() && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
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openCamera()
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} else {
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Toast.makeText(this, "需要相机权限", Toast.LENGTH_SHORT).show()
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finish()
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}
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}
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}
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override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
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super.onActivityResult(requestCode, resultCode, data)
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if (requestCode == REQUEST_CODE_ALBUM && resultCode == RESULT_OK && data != null) {
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val uri = data.data
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uri?.let {
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Toast.makeText(this, "已选择图片", Toast.LENGTH_SHORT).show()
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}
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}
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}
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override fun onDestroy() {
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super.onDestroy()
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stopScanDecode()
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camera?.stopPreview()
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camera?.release()
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camera = null
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}
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}
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