CWAC相机-切换前向后摄像机不工作

Question

我已经集成了camera，我试图通过使用下面的代码在前后摄像头之间切换，但是它不能工作，我只能看到默认的back，camera.Where，我出错了吗？

     private boolean isBackCam=true;
     f = new CameraFragment();
        builder=new SimpleCameraHost.Builder(new DemoCameraHost(getApplicationContext()));
f.setHost(builder.useFullBleedPreview(true).build());
         handleSwitchCamera=(ImageButton)findViewById(R.id.handleSwitchCamera);
          handleSwitchCamera.setOnClickListener(new View.OnClickListener()
                {
                    @Override
                    public void onClick(View view) 
                {


                    if(isBackCam) 
                        {
                            isBackCam=false;
                            builder.useFrontFacingCamera(true);
                        }
                        else
                        {
                            isBackCam=true;
                            builder.useFrontFacingCamera(false);
                        }
                    }
                });

根据CommonsWare的答案更新-

 f = new CameraFragment();
        getFragmentManager().beginTransaction()
                .add(R.id.preview_view, f, TAG_CAMERA_FRAGMENT)
                .commit();
        f2 = new CameraFragment();     
builder=new SimpleCameraHost.Builder(new DemoCameraHost(getApplicationContext()));
        builder2=new SimpleCameraHost.Builder(new DemoCameraHost(getApplicationContext()));
        builder.useFrontFacingCamera(false);
        builder2.useFrontFacingCamera(true);
        f.setHost(builder.useFullBleedPreview(true).build());
        f2.setHost(builder2.useFullBleedPreview(true).build());
handleSwitchCamera.setOnClickListener(new View.OnClickListener()
    {
        @Override
        public void onClick(View view) {
            if(isBackCam) {
                Log.e("bhuvnesh","backcam");
                isBackCam=false;


                getFragmentManager().beginTransaction()
                        .replace(R.id.preview_view, f2, TAG_CAMERA_FRAGMENT)
                        .commit();
            }
            else
            {
                Log.e("bhuvnesh","frontcam");
                isBackCam=true;


                getFragmentManager().beginTransaction()
                        .replace(R.id.preview_view, f, TAG_CAMERA_FRAGMENT)
                        .commit();
            }
        }
    });
  [1]: https://github.com/commonsguy/cwac-camera

Answer 1

您需要在完全配置setHost()之后调用Builder。您不能只是在稍后更改Builder并期望进行更改。

请注意，setHost()设计为每个片段调用一次。如果你想在相机之间切换，你需要切换片段(每个摄像头一个)，就像演示应用程序所做的那样。