动态获取Android权限

@TargetApi(23)
private void showPhotoDialog() {
    if (dialog != null && dialog.isShowing()) {
        dialog.dismiss();
    }

    dialog = new BottomMenuDialog(mContext);
    dialog.setConfirmListener(new View.OnClickListener() {
        @Override
        public void onClick(View arg0) {
            if (dialog != null && dialog.isShowing()) {
                dialog.dismiss();
            }
            //如果sdk版本大于23  需要动态获取权限
            if (Build.VERSION.SDK_INT >= 23) {
                int checkPermission = checkSelfPermission(Manifest.permission.CAMERA);
                if (checkPermission != PackageManager.PERMISSION_GRANTED) {
                    if (shouldShowRequestPermissionRationale(Manifest.permission.CAMERA)) {
                        requestPermissions(new String[] {Manifest.permission.CAMERA}, REQUEST_CODE_ASK_PERMISSIONS);
                    } else {
                        new AlertDialog.Builder(mContext)
                        .setMessage("您需要在设置里打开相机权限。")
                        .setPositiveButton("确认", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                requestPermissions(new String[] {Manifest.permission.CAMERA}, REQUEST_CODE_ASK_PERMISSIONS);
                            }
                        })
                        .setNegativeButton("取消", null)
                        .create().show();
                    }
                    return;
                }
            }
            photoUtils.takePicture(MyAccountActivity.this);
        }
    });
    //选择照片
    dialog.setMiddleListener(new View.OnClickListener() {
        @Override
        public void onClick(View arg0) {
            if (dialog != null && dialog.isShowing()) {
                dialog.dismiss();
            }
            photoUtils.selectPicture(MyAccountActivity.this);
        }
    });
    dialog.show();
}