Livedata用的爽吗，StateFlow你也应该了解一下

(2..9).asFlow().collect{
            println(it)
        }
复制代码

implementation 'androidx.activity:activity-ktx:1.2.2'
    implementation "androidx.lifecycle:lifecycle-livedata-ktx:2.2.0"
复制代码

private val mutableStateFlow = MutableStateFlow("安安安安卓")//构造中需要有初始值
    val stateFlow: StateFlow<String> = mutableStateFlow//这里为什么要赋值给stateFlow呢，因为stateFlow是不能对value进行赋值的，MutableStateFlow是可以的，这样做可以避免用户在activity中有更新数据的行为
    fun changeData(data: String) {
        mutableStateFlow.value = data//发送数据
    }
复制代码

btnSendData.setOnClickListener {
            viewModel.changeData("公众号：安安安安卓")
        }
        lifecycleScope.launch {//这里是运行在主线程的，所以下面的代码可以进行更新ui
            viewModel.stateFlow.collect {
                tvShowData.text = it
            }
        }
复制代码

class StateFlowMediatorViewModel : ViewModel() {
    private var count1 = 0//第一个按钮点击的次数
    private var count2 = 0//第二个按钮点击的次数
    private val flow1 = MutableStateFlow(0)
    private val flow2 = MutableStateFlow(0)
    val flow = flow1.combine(flow2) { data1, data2 ->
        data1 + data2//将两个flow融合，分别点击的数量相加
    }
    fun flow1pp() {
        flow1.value = ++count1//点击第一个按钮数量加1
    }
    fun flow2pp() {
        flow2.value = ++count2//点击第二个按钮数量加1
    }
}
复制代码

findViewById<Button>(R.id.btn_mediator1).setOnClickListener {
            model.flow1pp()
        }
        findViewById<Button>(R.id.btn_mediator2).setOnClickListener {
            model.flow2pp()
        }
        lifecycleScope.launch {
            model.flow.collect {
                textView?.text = if (it > 10) "亲爱的安安安安卓同学您已经点击了$it 次了，再点也不和你玩了" else "您已经点击了$it 次"
            }
        }
复制代码

lifecycleScope.launch {
            multipleViewModel.state11.collect {
                logEE(it)
                count++
                tv.text="收到StateFlow1数据更新 $count 次"
            }
            multipleViewModel.state22.collect {
                logEE(it)
                count++
                tv.text="收到StateFlow2数据更新 $count 次"
            }
        }
        findViewById<Button>(R.id.btn_state1_senddata).setOnClickListener {
            multipleViewModel.sendData1()//点击按钮更新第一个StateFlow的值
        }
        findViewById<Button>(R.id.btn_state2_senddata).setOnClickListener {
            multipleViewModel.sendData2()//点击按钮更新第二个StateFlow的值
        }
复制代码

private val state1 = MutableStateFlow<String>("哈哈哈1")
    private val state2 = MutableStateFlow<String>("哈哈哈哈2")
    private var count = 0
    val state11 = state1.asStateFlow()
    val state22 = state2.asStateFlow()
    fun sendData1() {
        count++
        state1.value = "state1被更改 $count"
    }
    fun sendData2() {
        count++
        state2.value = "state2被更改 $count"
    }
复制代码

lifecycleScope.launch {
            multipleViewModel.state11.collect {
                logEE(it)
                count++
                tv.text="收到数据更新 $count 次"
            }
            multipleViewModel.state22.collect {
                logEE(it)
            }
        }
复制代码

fun sendData1() {
        state1.value = "state1被更改"//我们设置设置这个值
    }
复制代码

btn_updatewith_simdata.setOnClickListener {
            model.setData()//点击按钮发送数据
        }
        model.livedata.observe(this){
            logEE("收到的数据是：${it}")
            count++
            tv_beupdate.text="收到livedata数据更新请求 $count 次"//收到数据更新后更新ui中textview的值
        }
复制代码

val livedata = MutableLiveData<Int>()
    fun setData(){
        livedata.value=124
    }
复制代码