Apm29's Studio.

Navigation初探

字数统计: 548阅读时长: 2 min
2019/12/11 Share

Usage

Gradle引入

  • 写的时候版本还是1.0.0-alpha1
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implementation "android.arch.navigation:navigation-fragment:$versions.navigation"
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implementation "android.arch.navigation:navigation-ui:$versions.navigation"

修改Layout文件

  • 新增一个Fragment,指定道航文件的定义app:navGraph="@navigation/nav_graph"
  • 指定Fragment的name android:name="androidx.navigation.fragment.NavHostFragment" 固定的
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    <?xml version="1.0" encoding="utf-8"?>
    <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">
    <fragment
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/my_nav_host_fragment"
    android:name="androidx.navigation.fragment.NavHostFragment"
    app:navGraph="@navigation/nav_graph"
    app:defaultNavHost="true"
    />
    </FrameLayout>

新建刚才指定的naviGraph文件

  • 在res目录下新建一个navigation文件夹,新建一个navi_graph.xml文件
  • 根节点navigation,指定初始的fragmentapp:startDestination="@+id/launcher_home"
  • 子节点fragment定义页面,id就是导航的页面标的,name是Fragment的全路径
  • actionfragment的子节点,定义了跳转的动作,通过action的id来寻找页面并导航到id标定的fragment,
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<?xml version="1.0" encoding="utf-8"?>
<!--
~ Copyright (C) 2017 The Android Open Source Project
~ Licensed under the Apache License, Version 2.0 (the "License");
~ you may not use this file except in compliance with the License.
~ You may obtain a copy of the License at
~ http://www.apache.org/licenses/LICENSE-2.0
~ Unless required by applicable law or agreed to in writing, software
~ distributed under the License is distributed on an "AS IS" BASIS,
~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
~ See the License for the specific language governing permissions and
~ limitations under the License.
-->
<navigation xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
app:startDestination="@+id/launcher_home">

<fragment android:id="@+id/launcher_home"
android:label="Home"
android:name="com.shirly.apm29.shirlyq.ui.main.MainFragment" >

<action android:id="@+id/end_action" app:destination="@id/end_dest"/>

</fragment>

<fragment android:id="@+id/end_dest"
android:label="End"
android:name="com.shirly.apm29.shirlyq.ui.end.EndFragment" >
<action android:id="@+id/start_action" app:destination="@id/launcher_home"/>
</fragment>
</navigation>

最后在代码中进行导航

  • 通过Navigation.findNavController方法找到导航控制器,navigate对应的action的id就会导航到对应的Fragment
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class MainFragment : Fragment() {


override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?): View {
return inflater.inflate(R.layout.main_fragment, container, false)
}

override fun onActivityCreated(savedInstanceState: Bundle?) {
super.onActivityCreated(savedInstanceState)

button.setOnClickListener {
// Navigate to the login destination
view?.let { Navigation.findNavController(it).navigate(R.id.end_action) }
}

}
}
CATALOG
  1. 1. Navigation初探
    1. 1.0.1. Usage