AndroidCamera2 API开关后退 - 前置摄像头

Question

第一次，它会尽可能地带到前置摄像头，但是每次我再次单击时，开关/交换不再起作用：预览（在前置摄像头上）逐渐消失，例如发生了一些事情，但是仍然在当前选择的摄像头（前摄像头）。

我的代码是我的代码：

中，在RecordVideoFragment中：

：

onViewCreated

这是

//  Switch camera button
        switchCameraButton = (ImageButton) view.findViewById(R.id.button_switch_camera);
        // Listener for Switch cameras button
        switchCameraButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                switchCameras();
            }
        });

函数：

switchCameras()

如果您对正在拯救我的情况有任何想法。我已经为此烦恼了几天。非常感谢
    

您需要做的是介绍新变量：

private void  switchCameras() {
        mCameraOpenCloseLock.release();
        mCameraDevice.close();

        CameraManager mCameraManager = (CameraManager) getActivity().getSystemService(Context.CAMERA_SERVICE);
        try {
            String mCameraId = mCameraManager.getCameraIdList()[0];
            if (mCameraId.equals("0")) {   // If currently on FRONT camera (0 = CameraCharacteristics.LENS_FACING_FRONT)
                mCameraId = "1";           // switch to BACK camera (1 = CameraCharacteristics.LENS_FACING_BACK)
                switchCameraButton.setImageResource(R.drawable.ic_camera_front);
            } else {  // If currently on BACK camera
                mCameraId = "0"; // switch to front camera
                switchCameraButton.setImageResource(R.drawable.ic_camera_back);
            }
            try {
                if (ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.CAMERA)
                        == PackageManager.PERMISSION_GRANTED) {
                    mCameraManager.openCamera(mCameraId, mStateCallback, null);
                } else {
                    requestVideoPermissions();
                }
            } catch (CameraAccessException e) {
                e.printStackTrace();
            }
        } catch (CameraAccessException e) {
            Toast.makeText(getActivity(), "Cannot access the camera.", Toast.LENGTH_SHORT).show();
            getActivity().finish();
        }
    }

从

opencamera

方法。

public static final String CAMERA_FRONT = "1";
public static final String CAMERA_BACK = "0";

private String cameraId = CAMERA_BACK;

Answer 1

中camera2basic

教程，镜头面向方向设置正确的相机，因此我在关闭并重新打开相机之前更改了此方向。

public void switchCamera() {
    if (cameraId.equals(CAMERA_FRONT)) {
        cameraId = CAMERA_BACK;
        closeCamera();
        reopenCamera();
        switchCameraButton.setImageResource(R.drawable.ic_camera_front);

    } else if (cameraId.equals(CAMERA_BACK)) {
        cameraId = CAMERA_FRONT;
        closeCamera();
        reopenCamera();
        switchCameraButton.setImageResource(R.drawable.ic_camera_back);
    }
}

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

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Answer 2

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Answer 3

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