android camerax怎樣處理視頻錄制

小樊
81
2024-11-16 20:19:57

Android CameraX 是一個(gè)用于處理相機(jī)功能的庫(kù)，它提供了一種簡(jiǎn)單的方法來(lái)集成相機(jī)功能到您的應(yīng)用程序中。要使用 CameraX 處理視頻錄制，您需要遵循以下步驟：

  1. 添加依賴(lài)項(xiàng)

在您的項(xiàng)目的 build.gradle 文件中添加 CameraX 和 CameraX LiveData 依賴(lài)項(xiàng)：

dependencies {
    implementation 'androidx.camera:camera-core:1.0.0'
    implementation 'androidx.camera:camera-camera2:1.0.0'
    implementation 'androidx.camera:camera-lifecycle:1.0.0'
    implementation 'androidx.camera:camera-view:1.0.0'
    implementation 'androidx.lifecycle:lifecycle-livedata-ktx:2.3.1'
}
  1. 配置 CameraX

在您的 Activity 或 Fragment 中，配置 CameraX 并設(shè)置預(yù)覽和錄制回調(diào)：

import android.Manifest
import android.content.pm.PackageManager
import androidx.appcompat.app.AppCompatActivity
import androidx.camera.core.CameraSelector
import androidx.camera.core.ImageAnalysis
import androidx.camera.core.ImageProxy
import androidx.camera.core.VideoCapture
import androidx.camera.lifecycle.ProcessCameraProvider
import androidx.core.app.ActivityCompat
import androidx.core.content.ContextCompat
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.launch

class MainActivity : AppCompatActivity() {

    private lateinit var cameraProviderFuture: ProcessCameraProvider
    private lateinit var preview: Preview
    private lateinit var videoCapture: VideoCapture
    private lateinit var imageAnalyzer: ImageAnalysis

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        // 檢查權(quán)限
        if (hasPermissions()) {
            // 獲取 CameraProvider
            cameraProviderFuture = ProcessCameraProvider.getInstance(this)
            cameraProviderFuture.addListener({
                val cameraProvider = cameraProviderFuture.get()
                bindPreviewAndRecord(cameraProvider)
            }, ContextCompat.getMainExecutor(this))
        }
    }

    private fun hasPermissions(): Boolean {
        return ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED &&
                ContextCompat.checkSelfPermission(this, Manifest.permission.RECORD_AUDIO) == PackageManager.PERMISSION_GRANTED
    }

    private fun bindPreviewAndRecord(cameraProvider: ProcessCameraProvider) {
        // 創(chuàng)建預(yù)覽
        preview = Preview.Builder().build()

        // 創(chuàng)建視頻錄制器
        videoCapture = VideoCapture.Builder().build()

        // 創(chuàng)建圖像分析器
        imageAnalyzer = ImageAnalysis.Builder()
            .setBackpressureStrategy(ImageAnalysis.STRATEGY_KEEP_ONLY_LATEST)
            .build()
            .also {
                it.setAnalyzer(CoroutineScope(Dispatchers.Default), ImageAnalyzer())
            }

        // 設(shè)置攝像頭選擇器
        val cameraSelector = CameraSelector.Builder().requireLensFacing(CameraSelector.LENS_FACING_BACK).build()

        // 綁定預(yù)覽和視頻錄制器到 CameraProvider
        cameraProvider.unbindAll()
        cameraProvider.bindToLifecycle(this, cameraSelector, preview, videoCapture, imageAnalyzer)
    }

    private inner class ImageAnalyzer : ImageAnalysis.Analyzer {
        override fun analyze(imageProxy: ImageProxy) {
            // 處理圖像數(shù)據(jù)，例如識(shí)別物體、人臉等
            val mediaImage = imageProxy.image
            if (mediaImage != null) {
                // 在這里處理圖像數(shù)據(jù)
            }
            imageProxy.close()
        }
    }
}
  1. 開(kāi)始和停止錄制

在您的 Activity 或 Fragment 中，添加開(kāi)始和停止錄制的邏輯：

private var isRecording = false

private fun startRecording() {
    isRecording = true
    videoCapture.startRecording(MediaStore.Video.Media.EXTERNAL_CONTENT_URI, object : VideoCapture.OnVideoSavedCallback {
        override fun onVideoSaved(outputFile: MediaStore.ImagesAndVideos.MediaFile) {
            // 視頻已保存
        }

        override fun onError(exc: Exception) {
            // 處理錯(cuò)誤
        }
    })
}

private fun stopRecording() {
    isRecording = false
    videoCapture.stopRecording()
}

現(xiàn)在，您已經(jīng)成功地使用 CameraX 處理了視頻錄制。請(qǐng)注意，這是一個(gè)簡(jiǎn)化的示例，您可能需要根據(jù)您的需求進(jìn)行調(diào)整。

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