基于CameraX Basics和Introduction to CAmeraX教程,我成功创建了一个活动,该活动在该活动中打开Camera。我想通过单击按钮在正面和背面之间切换相机。我使用以下代码来做到这一点:
@Override
protected void onCreate(Bundle savedInstanceState)
{
...
cameraOrientation = CameraX.LensFacing.BACK;
StartCamera();
switchCamera.setOnClickListener(new View.OnClickListener()
{
@SuppressLint("RestrictedApi")
@Override
public void onClick(View view)
{
CameraX.unbindAll();
cameraOrientation = (cameraOrientation == CameraX.LensFacing.BACK ? CameraX.LensFacing.FRONT : CameraX.LensFacing.BACK);
try {
StartCamera();
} catch (Exception e) {
Toast.makeText(context, "Error", Toast.LENGTH_SHORT).show(); }
}
});
}
private void StartCamera()
{
previewConfig = new PreviewConfig.Builder()
.setLensFacing(cameraOrientation)
.build();
preview = new Preview(previewConfig);
preview.setOnPreviewOutputUpdateListener(
new Preview.OnPreviewOutputUpdateListener()
{
@Override
public void onUpdated(Preview.PreviewOutput previewOutput)
{
textureView.setSurfaceTexture(previewOutput.getSurfaceTexture());
}
});
imageCaptureConfig = new ImageCaptureConfig.Builder()
.setLensFacing(cameraOrientation)
.setFlashMode(flashMode)
.build();
imageCapture = new ImageCapture(imageCaptureConfig);
CameraX.bindToLifecycle(SampleCameraActivity.this, imageCapture, preview);
}
但是,当我单击按钮时,应用程序卡住了(但不会崩溃),并且此错误不断重复显示在日志中:
E/GLConsumer: [SurfaceTexture-0–6996–1] updateAndRelease: GLConsumer is not attached to an OpenGL ES context
我还切换了闪光模式并使用此api拍照,所有这些工作正常。我也在多种设备上进行了测试。所有这些设备中都存在相同的错误。
最佳答案
几天前,我遇到了同样的问题,存在similar issue,但是建议的解决方案对我不起作用。起作用的是稍微修改了official sample中的方法bindCameraUseCases()
(在类似的问题中已链接到该方法)。从startCamera()
呼叫onCreate()
。
private fun startCamera() {
texture.post { bindCameraUseCases() }
//btn_take_picture.setOnClickListener { takePhoto() }
btn_swap_camera.setOnClickListener {swapCamera()}
}
@SuppressLint("RestrictedApi")
private fun swapCamera() {
lensFacing = when (lensFacing) {
CameraX.LensFacing.BACK -> CameraX.LensFacing.FRONT
CameraX.LensFacing.FRONT -> CameraX.LensFacing.BACK
else -> CameraX.LensFacing.BACK
}
CameraX.getCameraWithLensFacing(lensFacing)
bindCameraUseCases()
}
// Slightly modified code from the sample
private fun bindCameraUseCases() {
CameraX.unbindAll()
val metrics = DisplayMetrics().also { texture.display.getRealMetrics(it) }
val screenAspectRatio = Rational(metrics.widthPixels, metrics.heightPixels)
val viewFinderConfig = PreviewConfig.Builder().apply {
setLensFacing(lensFacing)
setTargetAspectRatio(screenAspectRatio)
setTargetRotation(texture.display.rotation)
}.build()
preview = AutoFitPreviewBuilder.build(viewFinderConfig, texture) // See note below
val imageCaptureConfig = ImageCaptureConfig.Builder().apply {
setLensFacing(lensFacing)
setCaptureMode(ImageCapture.CaptureMode.MIN_LATENCY)
setTargetAspectRatio(screenAspectRatio)
setTargetRotation(texture.display.rotation)
}.build()
imageCapture = ImageCapture(imageCaptureConfig)
CameraX.bindToLifecycle(this, preview, imageCapture)
}
请注意,类
AutoFitPreviewBuilder
来自样本,可以找到here(示例是Google许可的Apache 2.0,因此用法应合理)
关于android - 如何在CameraX API中切换相机?,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/57985941/