android camerax怎樣實(shí)現(xiàn)實(shí)時(shí)濾鏡

小樊
81
2024-11-16 20:26:01

在Android中使用CameraX庫(kù)實(shí)現(xiàn)實(shí)時(shí)濾鏡，可以通過(guò)以下步驟來(lái)完成：

  1. 添加依賴： 首先，在你的build.gradle文件中添加CameraX和濾鏡相關(guān)的依賴項(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 'com.google.android.material:material:1.2.1'
    // 如果你需要使用濾鏡庫(kù)，可以添加如Glide或Picasso等庫(kù)
}

  2. 配置CameraX： 在你的Activity或Fragment中，配置CameraX并設(shè)置預(yù)覽視圖。

    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)

        // 創(chuàng)建一個(gè)單線程的ExecutorService用于圖像分析
        val executor: ExecutorService = Executors.newSingleThreadExecutor()

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

        // 設(shè)置預(yù)覽視圖
        previewView.previewViewInfo = PreviewView.PreviewViewInfo.Builder().build()

        // 創(chuàng)建圖像分析器
        imageAnalyzer = ImageAnalyzer(executor)

        // 設(shè)置相機(jī)選擇器
        val cameraSelector = CameraSelector.Builder().requireLensFacing(CameraSelector.LENS_FACING_BACK).build()

        // 綁定預(yù)覽視圖和相機(jī)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)
    }
}

  3. 實(shí)現(xiàn)圖像分析器： 創(chuàng)建一個(gè)圖像分析器類，用于處理圖像并應(yīng)用濾鏡效果。

    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)

            // 應(yīng)用濾鏡效果
            scriptIntrinsicBlur.setRadius(5f) // 設(shè)置模糊半徑
            scriptIntrinsicBlur.setInput(inAllocation)
            scriptIntrinsicBlur.forEach(outAllocation)

            // 將處理后的圖像設(shè)置回預(yù)覽視圖
            outAllocation.copyTo(mediaImage)
            imageProxy.image = mediaImage

            // 釋放資源
            inAllocation.destroy()
            outAllocation.destroy()
        }

        imageProxy.close()
    }
}

  4. 布局文件： 確保你的布局文件中有一個(gè)PreviewView用于顯示預(yù)覽圖像。

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

通過(guò)以上步驟，你可以在Android中使用CameraX庫(kù)實(shí)現(xiàn)實(shí)時(shí)濾鏡效果。注意，這里的示例使用了RenderScript來(lái)進(jìn)行模糊效果的處理，你可以根據(jù)需要替換為其他濾鏡效果。

0 踩