Question

我一直在使用TextureView进行相机预览，直到我找不到设置背景颜色的方法，所以我切换到SurfaceView但预览不再有效。除了预览之外，其他一切工作正常。

这是我使用TextureView时的代码：

public void previewCamera(){
    try {
        SurfaceTexture surfaceTexture = textureView.getSurfaceTexture();
        surfaceTexture.setDefaultBufferSize(previewSize.getWidth(),previewSize.getHeight());
        Surface previewSurface = new Surface(surfaceTexture);

        captureRequestBuilder = device.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
        captureRequestBuilder.addTarget(previewSurface);
        device.createCaptureSession(Arrays.asList(previewSurface), new CameraCaptureSession.StateCallback() {
            @Override
            public void onConfigured(CameraCaptureSession session) {
                updatePreview(session);
            }

            @Override
            public void onConfigureFailed(CameraCaptureSession session) {
                Toast.makeText(getApplicationContext(),"unable to setup cam preview",Toast.LENGTH_SHORT).show();
            }
        },null);
    } catch (CameraAccessException e) {
        e.printStackTrace();
    }}

..这是我使用SurfaceView的代码

public void previewCamera(){
    try {
        Surface previewSurface = surfaceView.getHolder().getSurface();

        captureRequestBuilder = device.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
        captureRequestBuilder.addTarget(previewSurface);
        device.createCaptureSession(Arrays.asList(previewSurface), new CameraCaptureSession.StateCallback() {
            @Override
            public void onConfigured(CameraCaptureSession session) {
                updatePreview(session);
            }

...我正在添加此代码以防它与它有关

private void updatePreview(CameraCaptureSession session) {
    previewSession = session;
    if (null == device) {
        return;
    }
    try {
        handlerThread = new HandlerThread("CameraPreview");
        handlerThread.start();
        handler = new Handler(handlerThread.getLooper());

        captureRequestBuilder.set(CaptureRequest.CONTROL_MODE, CameraMetadata.CONTROL_MODE_AUTO);
        previewSession.setRepeatingRequest(captureRequestBuilder.build(), null, ((isRecording)? null:handler));
    } catch (CameraAccessException e) {
        e.printStackTrace();
    }
}

由于

Answer 1

您是否尝试在检索Surface对象之前设置固定大小？

surfaceView.setFixedSize(previewSize.getWidth(),previewSize.getHeight());

Answer 2

如果您使用 SurfaceView 进行预览，则不应使用处理程序。如下所示：

 manager.openCamera("0", mStateCallback, null);

顺便说一下，SurfaceView的大小不会让预览无效，所以你不必设置修正大小。

android camera2预览无法使用表面视图

2 个答案: