android camerax怎樣處理對(duì)焦

小樊
81
2024-11-16 20:21:51

在Android CameraX中處理對(duì)焦,您可以使用FocusMeteringAction來(lái)執(zhí)行對(duì)焦操作。以下是如何使用它的步驟:

  1. 首先,確保您的項(xiàng)目中已經(jīng)添加了CameraX庫(kù)的依賴項(xiàng)。在build.gradle文件中添加以下依賴:
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'
}
  1. 在您的Activity或Fragment中,初始化CameraX并設(shè)置視圖:
val preview = Preview.Builder().build()
val cameraProviderFuture = ProcessCameraProvider.getInstance(context)

cameraProviderFuture.addListener({
    val cameraProvider = cameraProviderFuture.get()
    bindPreviewAndCamera(cameraProvider, preview)
}, ContextCompat.getMainExecutor(context))
  1. 創(chuàng)建一個(gè)FocusMeteringAction實(shí)例并執(zhí)行對(duì)焦操作:
val cameraSelector = CameraSelector.Builder().requireLensFacing(CameraSelector.LENS_FACING_BACK).build()
val focusMeteringAction = FocusMeteringAction.Builder(cameraSelector)
    .setFocusDistance(1f) // 設(shè)置對(duì)焦距離,單位為米
    .build()

val imageAnalyzer = ImageAnalyzerBuilder().build()

cameraProvider.unbindAll()
cameraProvider.bindToLifecycle(this, cameraSelector, preview, imageAnalyzer, focusMeteringAction)

在這個(gè)例子中,我們創(chuàng)建了一個(gè)FocusMeteringAction實(shí)例,并設(shè)置了對(duì)焦距離為1米。然后,我們將這個(gè)動(dòng)作綁定到相機(jī)提供者、預(yù)覽和分析器上。當(dāng)對(duì)焦完成后,ImageAnalyzer將接收到對(duì)焦后的圖像。

請(qǐng)注意,這個(gè)例子使用了ImageAnalyzer來(lái)分析對(duì)焦結(jié)果,但您可以根據(jù)需要使用其他類型的分析器。

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