我正在尝试使用 Camera2
API 将相机数据流式传输到 SurfaceView
。我正在遵循本指南:Camera2 guide
我无法通过第 5 步
MainActivity.java::onCreate()
setContentView(R.layout.activity_main);
surfaceView = (SurfaceView)findViewById(R.id.surface);
manager = (CameraManager)getSystemService(Context.CAMERA_SERVICE);
MainActivity.java::onClick()
for (String id : manager.getCameraIdList()) {
CameraCharacteristics characteristics = manager.getCameraCharacteristics(id);
Integer direction = characteristics.get(CameraCharacteristics.LENS_FACING);
if (direction != null && direction == CameraCharacteristics.LENS_FACING_BACK) {
if (checkCallingOrSelfPermission("android.permission.CAMERA") == PackageManager.PERMISSION_GRANTED)
manager.openCamera(id, new StateCallback(), null);
break;
}
}
MainActivity.java.StateCallback::onOpened(CameraDevice camera)
List<Surface> surfaces = new LinkedList<>();
surfaces.add(surfaceView.getHolder().getSurface());
CaptureRequest.Builder builder = camera.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
builder.addTarget(surfaces.get(0));
camera.createCaptureSession(surfaces, new CameraCaptureSession.StateCallback() {
@Override
public void onConfigured(CameraCaptureSession session) {
Log.i(TAG, "Configured");
}
@Override
public void onConfigureFailed(CameraCaptureSession session) {
Log.e(TAG, "Configured failed"); // Ends up in this function :(
}
}, null);
程序在 onConfigureFailed()
函数中结束。我不知道可能是什么错误,也不知道如何检查是什么。
我的猜测是我在 CaptureRequest
中遗漏了一些东西,但我不知道是什么。
我在 Samsung Galaxy S4 上运行.
最佳答案
添加到onConfigured:
if (null == cameraDevice) {
Log.e(TAG, "updatePreview error, return");
return;
}
captureRequestBuilder.set(CaptureRequest.CONTROL_MODE, CameraMetadata.CONTROL_MODE_AUTO);
try {
cameraCaptureSessions.setRepeatingRequest(captureRequestBuilder.build(), null, mBackgroundHandler);
} catch (CameraAccessException e) {
e.printStackTrace();
}
关于java - CameraDevice 无法创建 session [Camera2],我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/33987245/