在导航中添加安全项时出错
在导航中添加安全项时出错
提问于 2019-10-31 05:58:30
我只是想在我的碎片上加些保险箱。我跟踪的代码是：导航码标。但是，当我使用以下行时：
val safeArgs = FlowStepFragmentArgs by navArgs()我得到一个编译器错误：
分类器'FlowStepFragmentArgs‘没有伴生对象，因此必须在这里初始化
以下是我的主要分级文件：
buildscript {
ext {
version_kotlin = "1.3.41"
version_core = "1.1.0"
version_constraint_layout = "1.1.3"
version_lifecycle_extensions = "2.0.0"
version_material = "1.0.0"
version_navigation = "2.1.0"
}
repositories {
google()
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:3.3.2'
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$version_kotlin"
classpath "androidx.navigation:navigation-safe-args-gradle-plugin:$version_navigation"
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}
allprojects {
repositories {
google()
jcenter()
}
}
task clean(type: Delete) {
delete rootProject.buildDir
}还有我的应用程序gradle文件：
apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-kapt'
apply plugin: 'kotlin-android-extensions'
apply plugin: 'androidx.navigation.safeargs'
android {
compileSdkVersion 29
buildToolsVersion "29.0.2"
dataBinding {
enabled = true
}
defaultConfig {
applicationId 'com.example.android.navigation'
minSdkVersion 19
targetSdkVersion 29
vectorDrawables.useSupportLibrary = true
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
productFlavors {
}
}
dependencies {
implementation fileTree(include: ['*.jar'], dir: 'libs')
implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$version_kotlin"
implementation "androidx.constraintlayout:constraintlayout:$version_constraint_layout"
implementation "androidx.core:core:$version_core"
implementation "com.google.android.material:material:$version_material"
implementation 'androidx.legacy:legacy-support-v4:1.0.0'
//Navigation
implementation "androidx.navigation:navigation-fragment-ktx:$rootProject.version_navigation"
implementation "androidx.navigation:navigation-ui-ktx:$rootProject.version_navigation"
}我的navigation.xml是：
<?xml version="1.0" encoding="utf-8"?>
<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">
</action>
</fragment>
<fragment
android:id="@+id/flow_step_one_dest"
android:name="com.example.android.codelabs.navigation.FlowStepFragment"
tools:layout="@layout/flow_step_one_fragment">
<argument
android:name="flowStepNumber"
app:argType="integer"
android:defaultValue="1"/>
<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">
<argument
android:name="flowStepNumber"
app:argType="integer"
android:defaultValue="2"/>
<action
android:id="@+id/next_action"
app:popUpTo="@id/home_dest">
</action>
</fragment>
<fragment>
<android:id="@+id/settings_dest">
<android:name="com.example.android.codelabs.navigation.SettingsFragment">
<android:label="@string/settings">
<tools:layout="@layout/settings_fragment" />
</fragment>
</navigation>我把这个项目清理了好几次，但没有效果。有人能指出我在这里犯的错误吗？
回答 1
Stack Overflow用户
发布于 2019-10-31 07:10:14
我认为您的navigation.xml文件中有错误：
您可以在home_dest片段中执行以下操作：
<action>
<android:id="@+id/next_action">
<app:destination="@+id/flow_step_one_dest">
</action>但id和destination是action的论据。用这种方式改变它，然后再试一次：
<action
android:id="@+id/next_action"
app:destination="@+id/flow_step_one_dest">
</action>页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/58637603
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