Android P 通过系统属性来禁止打开系统Camera和第三方Camera_android 系统开发不允许三方应用打开后摄

1.禁止第三方APP打开Camera
frameworks/base/core/java/android/hardware/Camera.java

 public static Camera open(int cameraId) {
        // add 
        if(SystemProperties.get("persist.sys.disablecamera").equals("true")){
            return null;
        }
        // end
        return new Camera(cameraId);
    }

public static Camera open() { 
        //add 
        if(SystemProperties.get("persist.sys.disablecamera").equals("true")){
            return null;
        }
        // end
        int numberOfCameras = getNumberOfCameras();
        CameraInfo cameraInfo = new CameraInfo();
        for (int i = 0; i < numberOfCameras; i++) {
            getCameraInfo(i, cameraInfo);
            if (cameraInfo.facing == CameraInfo.CAMERA_FACING_BACK) {
                return new Camera(i);
            }
        }
        return null;
    }


 public static Camera openLegacy(int cameraId, int halVersion) {
        if (halVersion < CAMERA_HAL_API_VERSION_1_0) {
            throw new IllegalArgumentException("Invalid HAL version " + halVersion);
        }
        // add 
        if(SystemProperties.get("persist.sys.disablecamera").equals("true")){
            return null;
        }
        // end
        return new Camera(cameraId, halVersion);
    }


public static Camera openUninitialized() {
        // add 
        if(SystemProperties.get("persist.sys.disablecamera").equals("true")){
            return null;
        }
        //end
        return new Camera();
    }
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2.禁止打开系统Camera
frameworks/base/core/java/android/hardware/camera2/CameraManager.java

import android.os.SystemProperties;//add 


 private CameraDevice openCameraDeviceUserAsync(String cameraId,
            CameraDevice.StateCallback callback, Executor executor, final int uid)
            throws CameraAccessException {
        CameraCharacteristics characteristics = getCameraCharacteristics(cameraId);
        CameraDevice device = null;
        //add 
        if(SystemProperties.get("persist.sys.disablecamera").equals("true")){
            return null;
        }
        // end
        synchronized (mLock) {

            ICameraDeviceUser cameraUser = null;
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3.可以通过设置"persist.sys.disablecamera"的值来控制是否禁用Camera。