权限检测生效条件：

• targetSdkVersion 以及 compileSdkVersion 升级到 23 及以上
• 运行 Android 系统 6.0 及以上

三种检测权限写法：

    public static boolean checkPermission1(Context context, String[] permissions) {
        PackageManager packageManager = context.getPackageManager();
        String packageName = context.getPackageName();

        for (String permission : permissions) {
            int per = packageManager.checkPermission(permission, packageName);
            if (PackageManager.PERMISSION_DENIED == per) {
                Log.w(TAG, "required permission not granted . permission = " + permission);
                return false;
            }
        }
        return true;
    }

    public static boolean checkPermission2(Context context, String[] permissions) {

        for (String permission : permissions) {
            int per =context.checkPermission(permission, Process.myPid(),Process.myUid());
            if (PackageManager.PERMISSION_GRANTED != per) {
                Log.w(TAG, "required permission not granted . permission = " + permission);
                return false;
            }
        }
        return true;
    }

    public static boolean checkPermission3(Context context, String[] permissions) {

        for (String permission : permissions) {
            int per = ContextCompat.checkSelfPermission(context, Manifest.permission.CAMERA);
            if (PackageManager.PERMISSION_GRANTED != per) {
                Log.w(TAG, "required permission not granted . permission = " + permission);
                return false;
            }
        }
        return true;
    }

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