基于RxPermissions和RxJava封装的权限申请工具类

object PermissionsUtil {

    enum class PermissionType {
        EXTERNAL_STORAGE,//存储读写
        CAMERA,//相机
    }

    /**
     * @param  rxPermissions RxPermissions对象
     * @param  success 成功的操作
     * @param  error 失败的操作
     * @param  types PermissionType 需要的权限
     */
    fun requestPermissions(
        rxPermissions: RxPermissions,
        success: () -> Unit,
        error: () -> Unit,
        vararg types: PermissionType
    ) {
        getPermissions(rxPermissions, *types)
            .subscribe(object : Observer<Boolean> {
                override fun onComplete() {

                }

                override fun onSubscribe(d: Disposable) {

                }

                override fun onNext(t: Boolean) {
                    if (t) {
                        success()
                    } else {
                        error()
                    }
                }

                override fun onError(e: Throwable) {
                    error()
                }
            })
    }

    private fun getPermissions(
        rxPermissions: RxPermissions,
        vararg types: PermissionType
    ): Observable<Boolean> {
        return if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && types.isNotEmpty()) {
            val list = mutableListOf<String>()
            types.forEach {
                when (it) {
                    PermissionsUtil.PermissionType.EXTERNAL_STORAGE -> {
                        list.add(Manifest.permission.READ_EXTERNAL_STORAGE)
                        list.add(Manifest.permission.WRITE_EXTERNAL_STORAGE)
                    }
                    PermissionsUtil.PermissionType.CAMERA -> {
                        list.add(Manifest.permission.CAMERA)
                    }
                }
            }
            val array = list.toTypedArray()
            rxPermissions.request(*array)
        } else {
            Observable.create { emitter ->
                emitter.onNext(true)
                emitter.onComplete()
            }
        }
    }

}

使用

        PermissionsUtil.requestPermissions(
            RxPermissions(this),
            { download() },
            { showShortToast(R.string.err_nopermission) },
            PermissionsUtil.PermissionType.EXTERNAL_STORAGE
        )