jetpack之navigation
Posted BigSweetee
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navigation
基本用法如下
定义基础跳转fragmentNavHostFragment
在首页的layout中
如我的首页是homefragment
<fragment
android:id="@+id/my_nav_host_fragment"
android:name="androidx.navigation.fragment.NavHostFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:defaultNavHost="true"
app:navGraph="@navigation/mobile_navigation" />
name为android:name=“androidx.navigation.fragment.NavHostFragment”
navGraph为mobile_navigation
mobile_navigation中定义了所有跳转的界面
mobile_navigation
已navigation为根节点
里面配置了fragment
<navigation xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
app:startDestination="@+id/home_dest">
<fragment
android:id="@+id/home_dest"
android:name="com.example.android.codelabs.navigation.HomeFragment"
android:label="@string/home"
tools:layout="@layout/home_fragment">
<action
android:id="@+id/next_action"
app:destination="@+id/flow_step_one_dest"
app:enterAnim="@anim/slide_in_right"
app:exitAnim="@anim/slide_out_left"
app:popEnterAnim="@anim/slide_in_left"
app:popExitAnim="@anim/slide_out_right" />
</fragment>
<fragment
android:id="@+id/flow_step_one_dest"
android:name="com.example.android.codelabs.navigation.FlowStepFragment"
tools:layout="@layout/flow_step_one_fragment">
//safe传参
<argument
android:name="flowStepNumber"
app:argType="integer"
android:defaultValue="2"/>
<action
android:id="@+id/next_action"
app:destination="@+id/flow_step_two_dest">
</action>
</fragment>
<fragment
android:id="@+id/flow_step_two_dest"
android:name="com.example.android.codelabs.navigation.FlowStepFragment"
tools:layout="@layout/flow_step_two_fragment">
//safe传参
<argument
android:name="flowStepNumber"
app:argType="integer"
android:defaultValue="2"/>
<action
android:id="@+id/next_action"
app:popUpTo="@id/home_dest">
</action>
</fragment>
</navigation>
代码中调用一下语句可以触发该fragment的action标签id为R.id.next_action
Navigation.createNavigateOnClickListener(R.id.next_action)
destination为action标签中要跳转的下一个界面
如
<action
android:id="@+id/next_action"
app:destination="@+id/flow_step_one_dest">
</action>
id为flow_step_one_dest的是下一个界面的id对应的fragment为FlowStepFragment
<fragment
android:id="@+id/flow_step_one_dest"
android:name="com.example.android.codelabs.navigation.FlowStepFragment"
tools:layout="@layout/flow_step_one_fragment">
或者直接通过代码跳转
findNavController(this).navigate(R.id.flow_step_one_dest, null, options)
options为跳转动画
val options = navOptions
anim
enter = R.anim.slide_in_right
exit = R.anim.slide_out_left
popEnter = R.anim.slide_in_left
popExit = R.anim.slide_out_right
popupto
action中的popupto方法
<action
android:id="@+id/next_action"
app:popUpTo="@id/settings_dest"
app:popUpToInclusive="true"
app:destination="@+id/flow_step_two_dest">
</action>
fragmentA-fragmentB-fragmentC-fragmentSettingsDest
当fragmentSettingsDest跳转到fragmentA的时候
fragmentB-fragmentC-会弹出
同时如果加了popUpToInclusive这个属性的话
那么回退栈只有一个A,否则会有俩个A
参数传递
mobile_navigation某个item配置如下
<fragment
android:id="@+id/flow_step_two_dest"
android:name="com.example.android.codelabs.navigation.FlowStepFragment"
tools:layout="@layout/flow_step_two_fragment">
<argument
android:name="flowStepNumber"
app:argType="integer"
android:defaultValue="2"/>
<action
android:id="@+id/next_action"
app:popUpTo="@id/settings_dest">
</action>
</fragment>
<argument标签为参数传递标签
传参方法如下A-B
A代码点击事件
view.findViewById<Button>(R.id.navigate_action_button)?.setOnClickListener
val flowStepNumberArg = 1
val action = HomeFragmentDirections.nextAction(flowStepNumberArg)
findNavController(this).navigate(action)
B代码接收在oncreate中
val safeArgs: FlowStepFragmentArgs by navArgs()
val flowStepNumber = safeArgs.flowStepNumber
flowStepNumber参数为1
剩余问题,
传统的startactivity可以startactivityResult接收requestcode
用navigation怎么实现?
传统的startactivity可以跳转一些系统界面用navigation怎么实现
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