CWAC CAMERA-切换前后摄像头不工作

Question

我已经集成了 [CWAC-CAMERA][1]。我正在尝试通过使用以下代码单击按钮在后置和前置摄像头之间切换，但它 working.I 只能看到默认后置camera.Where我错了吗？

     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 回答更新-

 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 Builder 之后调用 setHost() 。您不能稍后更改 Builder 并期待更改。

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，你需要像演示应用程序那样切换片段（每个相机一个）。

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