android camerax怎样实现实时滤镜

在Android中使用CameraX库实现实时滤镜，可以通过以下步骤来完成：

添加依赖：首先，在你的build.gradle文件中添加CameraX和滤镜相关的依赖项。

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 'com.google.android.material:material:1.2.1'
    // 如果你需要使用滤镜库，可以添加如Glide或Picasso等库
}

配置CameraX：在你的Activity或Fragment中，配置CameraX并设置预览视图。

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import androidx.camera.core.CameraSelector
import androidx.camera.core.ImageAnalysis
import androidx.camera.core.ImageProxy
import androidx.camera.core.ImageAnalyzer
import androidx.camera.core.ImageProxy
import androidx.camera.lifecycle.ProcessCameraProvider
import androidx.camera.view.PreviewView
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.GlobalScope
import kotlinx.coroutines.launch
import java.util.concurrent.ExecutorService
import java.util.concurrent.Executors

class MainActivity : AppCompatActivity() {

    private lateinit var cameraProviderFuture: ProcessCameraProvider
    private lateinit var previewView: PreviewView
    private lateinit var imageAnalyzer: ImageAnalyzer

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

        previewView = findViewById(R.id.previewView)

        // 创建一个单线程的ExecutorService用于图像分析
        val executor: ExecutorService = Executors.newSingleThreadExecutor()

        // 获取CameraProvider
        cameraProviderFuture = ProcessCameraProvider.getInstance(this)

        // 设置预览视图
        previewView.previewViewInfo = PreviewView.PreviewViewInfo.Builder().build()

        // 创建图像分析器
        imageAnalyzer = ImageAnalyzer(executor)

        // 设置相机选择器
        val cameraSelector = CameraSelector.Builder().requireLensFacing(CameraSelector.LENS_FACING_BACK).build()

        // 绑定预览视图和相机提供者
        cameraProviderFuture.addListener({
            val cameraProvider = cameraProviderFuture.get()
            bindPreviewAndImageAnalyzer(cameraProvider)
        }, ContextCompat.getMainExecutor(this))
    }

    private fun bindPreviewAndImageAnalyzer(cameraProvider: ProcessCameraProvider) {
        val preview = Preview.Builder().build().also {
            it.setSurfaceProvider(previewView.surfaceProvider)
        }

        val cameraSelector = CameraSelector.Builder().requireLensFacing(CameraSelector.LENS_FACING_BACK).build()

        val imageAnalyzer = ImageAnalyzer(executor)

        val cameraTap = ImageProxy.Builder().build()

        cameraProvider.unbindAll()
        cameraProvider.bindToLifecycle(this, cameraSelector, preview, imageAnalyzer, cameraTap)
    }
}

实现图像分析器：创建一个图像分析器类，用于处理图像并应用滤镜效果。

import android.renderscript.Allocation
import android.renderscript.Element
import android.renderscript.RenderScript
import android.renderscript.ScriptIntrinsicBlur
import androidx.camera.core.ImageProxy
import java.nio.ByteBuffer

class ImageAnalyzer(private val executor: ExecutorService) : ImageAnalysis.Analyzer {

    private val rs = RenderScript.create(applicationContext)
    private val inAllocation = Allocation.createFromBitmap(rs, (previewView as PreviewView).image)
    private val outAllocation = Allocation.createFromBitmap(rs, (previewView as PreviewView).image)
    private val scriptIntrinsicBlur = ScriptIntrinsicBlur.create(rs, Element.U8_4(rs))

    override fun analyze(imageProxy: ImageProxy) {
        if (imageProxy.image != null) {
            val mediaImage = imageProxy.image!!
            inAllocation.copyFrom(mediaImage)

            // 应用滤镜效果
            scriptIntrinsicBlur.setRadius(5f) // 设置模糊半径
            scriptIntrinsicBlur.setInput(inAllocation)
            scriptIntrinsicBlur.forEach(outAllocation)

            // 将处理后的图像设置回预览视图
            outAllocation.copyTo(mediaImage)
            imageProxy.image = mediaImage

            // 释放资源
            inAllocation.destroy()
            outAllocation.destroy()
        }

        imageProxy.close()
    }
}

布局文件：确保你的布局文件中有一个PreviewView用于显示预览图像。

<androidx.camera.view.PreviewView
    android:id="@+id/previewView"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

通过以上步骤，你可以在Android中使用CameraX库实现实时滤镜效果。注意，这里的示例使用了RenderScript来进行模糊效果的处理，你可以根据需要替换为其他滤镜效果。

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