Question

protected void onResume() {
        super.onResume();
        Log.d("OnResume", "Camera has been resumed");

        try {
               mCamera = Camera.open();
            Log.d("OnResume", "Camera has been opened");
            mCamera.startPreview();
            Log.d("OnResume", "Camera has started preview");
            preview.setCamera(mCamera);
            Log.d("OnResume", "setCamera");
            }   catch (RuntimeException ex) {
            Log.d("OnResume", ex.getMessage());
        }
    }

调用mCamera = Camera.open（）时出错。它无法连接到摄像头服务。无需使用清单文件中的所有权限。

 Error while opening the camera and camera services

    D/OnResume﹕ Camera has been resumed.

    W/CameraBase﹕ An error occurred while connecting to camera: 0.

    D/OnResume﹕ Fail to connect to camera service

    Getting error in inside try block. Have used the camera permission in manifest file.

Answer 1

自我提示有关问题的错误，您在AndroidManifest.xml中添加了相机权限的错过：

<uses-permission android:name="android.permission.CAMERA" />

如果需要，还要添加uses-feature：

<uses-feature
        android:name="android.hardware.camera"
        android:required="false" />

相机预览显示黑屏

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