Android Camera开发入门 第七篇: Camera2相机 预览功能实现
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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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