Android Compose 监听系统返回键监听的方法

Compose返回键监听方法

方法1

@Composable
fun Back1(controller: NavHostController) {
    Column(
        Modifier
            .fillMaxSize()
            .background(Color.Red)
            .clickable {
                controller.popBackStack()
            }) {
        Text(text = "点击返回上一个页面")
        Text(text = "使用BackHandler实现返回键监听")
    }
    BackHandler(enabled = true) {
        Log.e("tag","返回键被点击")
    }
}

方法2

在@Composable方法中加入如下监听设置，方法1的实现方式就是使用如下方式实现的

@Composable
fun Back2(controller: NavHostController) {
    Column(
        Modifier
            .fillMaxSize()
            .background(Color.Green)
            .clickable {
                controller.popBackStack()
            }) {
        Text(text = "点击返回上一个页面")
        Text(text = "使用OnBackPressedDispatcher监听返回键被点击")
    }
    val callback = remember {
        object : OnBackPressedCallback(true) {
            override fun handleOnBackPressed() {
                log("回退键被点击")
                showToast("监听到返回键被点击监听")
            }
        }
    }
    val dispatcher = LocalOnBackPressedDispatcherOwner.current?.onBackPressedDispatcher
    DisposableEffect(key1 = Unit, effect = {
        dispatcher?.addCallback(callback)
        onDispose {
            callback.remove()
        }
    })
}