我正在尝试使用Camera2 API将相机数据流式传输到SurfaceView.我正在按照本指南：
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);
该程序最终在onConfigureFailed()函数中.我不知道可能是什么错误,我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.
我正在运行Samsung Galaxy S4.
解决方法
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();
}
