Android CameraX是一个用于相机功能开发的Jetpack库。它提供了简化的API,使开发者能够更轻松地实现相机功能,并且兼容各种Android设备。
在Android CameraX中,要手动更改曝光补偿,可以通过以下步骤实现:
dependencies {
def camerax_version = "1.1.0-alpha07"
implementation "androidx.camera:camera-camera2:$camerax_version"
implementation "androidx.camera:camera-lifecycle:$camerax_version"
implementation "androidx.camera:camera-view:1.0.0-alpha24"
}
val previewConfig = PreviewConfig.Builder().build()
val preview = Preview(previewConfig)
preview.setOnPreviewOutputUpdateListener { previewOutput ->
// 将预览输出更新到你的UI组件中
val parent = previewView.parent as ViewGroup
parent.removeView(previewView)
parent.addView(previewView, 0)
previewView.surfaceTexture = previewOutput.surfaceTexture
updateTransform()
}
val cameraProviderFuture = ProcessCameraProvider.getInstance(context)
cameraProviderFuture.addListener(Runnable {
val cameraProvider = cameraProviderFuture.get()
val cameraSelector = CameraSelector.Builder()
.requireLensFacing(CameraSelector.LENS_FACING_BACK)
.build()
cameraProvider.unbindAll()
cameraProvider.bindToLifecycle(this, cameraSelector, preview)
}, ContextCompat.getMainExecutor(context))
previewView.setOnTouchListener { _, event ->
if (event.action == MotionEvent.ACTION_DOWN) {
val factory = previewView.meteringPointFactory
val point = factory.createPoint(event.x, event.y)
val action = FocusMeteringAction.Builder(point).build()
camera?.cameraControl?.startFocusAndMetering(action)
}
true
}
// 增加曝光补偿
camera?.cameraControl?.setLinearExposureCompensation(0.5f)
// 减少曝光补偿
camera?.cameraControl?.setLinearExposureCompensation(-0.5f)
通过以上步骤,你可以在Android CameraX中实现手动更改曝光补偿的功能。这对于需要精确控制相机曝光的应用场景非常有用,例如拍摄照片或录制视频时需要调整亮度的情况。
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