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显示需要借助surface，一般采用surfaceview或者textureview；

相关重要流程：

1、自定义TextureView

private AutoFitTextureView mTextureView;

2、Activity OnResume的时候，判断mTextureView 当前状态。如果是available状态，则直接打开camera，否则设置surfaceTexture监听

if (mTextureView.isAvailable()) {            openCamera(mTextureView.getWidth(), mTextureView.getHeight()); } else {            mTextureView.setSurfaceTextureListener(mSurfaceTextureListener); }

3、surfaceTexture监听中，SurfaceTextureAvailable的时候，去执行opencamera的操作

privatefinal TextureView.SurfaceTextureListener mSurfaceTextureListener            = new TextureView.SurfaceTextureListener() {        @Override        public void onSurfaceTextureAvailable(SurfaceTexture texture, int width, int height) {            openCamera( width, height);        }        @Override        public void onSurfaceTextureSizeChanged(SurfaceTexture texture, int width, int height) {            configureTransform(width, height);        }        @Override        public boolean onSurfaceTextureDestroyed(SurfaceTexture texture) {            returntrue;        }        @Override        public void onSurfaceTextureUpdated(SurfaceTexture texture) {        }    };

4、设置surface target

Surface surface = new Surface(texture);// We set up a CaptureRequest.Builder with the output Surface.mPreviewRequestBuilder		= mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);mPreviewRequestBuilder.addTarget(surface);

5、 创建会话中，传入surface

mCameraDevice.createCaptureSession(Arrays.asList(surface, mImageReader.getSurface()),                    new CameraCaptureSession.StateCallback() {}

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