6.0以後出了許可權管理，而V4提供了一個許可權檢測的方法ContextCompat.checkSelfPermission

我在開發過程中遇到一個很詭異的問題：
有部分機型，當相機許可權被禁用的時候，checkSelfPermission返回的boolean仍然為true，再開啟相機就會報錯。

後來換一個思路可以相容，通過捕捉異常來檢測許可權

import android.Manifest;
import android.app.Activity;
import android.content.Context;
import android.hardware.Camera;
import
 
 android.os.Build;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v4.content.PermissionChecker;

/**
 * 攝像頭許可權檢測
 * author  dengyuhan
 * created 2017/3/6 18:08
 */
public class CameraPermissionCompat
 
 {

    private static final int REQUEST_CODE_CAMERA = 999;
    private static OnCameraPermissionListener mOnCameraPermissionListener;


    /**
     * 檢測攝像頭許可權 沒有就會申請
     * @param context
     * @param listener 申請許可權的結果回撥
     * @return
     */
    public static boolean checkCameraPermission(Context context, OnCameraPermissionListener listener) {
        mOnCameraPermissionListener = listener;
        boolean
 
 granted = true;
        //魅族或者6.0以下
        if (isFlyme() || Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
            Camera mCamera = null;
            try {
                mCamera = Camera.open();
                // setParameters 是針對魅族MX5 做的。MX5 通過Camera.open() 拿到的Camera
                // 物件不為null
                Camera.Parameters mParameters = mCamera.getParameters();
                mCamera.setParameters(mParameters);
            } catch (Exception e) {
                granted = false;
            }
            if (mCamera != null) {
                mCamera.release();
            }
        } else {
            granted = ContextCompat.checkSelfPermission(context, Manifest.permission.CAMERA) == PermissionChecker.PERMISSION_GRANTED;
        }
        if (granted) {
            if (mOnCameraPermissionListener != null) {
                mOnCameraPermissionListener.onGrantResult(true);
            }
        } else {
            if (context instanceof Activity) {
                ActivityCompat.requestPermissions((Activity) context, new String[]{Manifest.permission.CAMERA}, REQUEST_CODE_CAMERA);
            }
        }
        return granted;
    }

    public static void onRequestPermissionsResult(Context context, int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        if (requestCode == REQUEST_CODE_CAMERA) {
            if (mOnCameraPermissionListener != null) {
                mOnCameraPermissionListener.onGrantResult(checkCameraPermission(context,null));
            }

        }
    }

    private static boolean isFlyme() {
        if (Build.BRAND.contains("Meizu")) {
            return true;
        } else {
            return false;
        }
    }


    public interface OnCameraPermissionListener {
        void onGrantResult(boolean granted);
    }
}