我在我的 android 项目中使用导航组件。我启用了 Gradle 的类型安全 args 插件，这是我的build.gradle(app)文件。
apply plugin: 'com.android.application'
apply plugin: "androidx.navigation.safeargs"
apply plugin: 'com.google.gms.google-services'
android {
compileSdkVersion 29
buildToolsVersion "29.0.2"
defaultConfig {
applicationId "com.example.nibotransporti"
minSdkVersion 21
targetSdkVersion 29
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
dataBinding.enabled = true
compileOptions {
sourceCompatibility = 1.8
targetCompatibility = 1.8
};
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'androidx.appcompat:appcompat:1.1.0'
implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
implementation 'androidx.legacy:legacy-support-v4:1.0.0'
implementation 'androidx.legacy:legacy-support-core-utils:1.0.0'
implementation 'androidx.appcompat:appcompat:1.1.0'
implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
implementation "androidx.lifecycle:lifecycle-extensions:2.2.0"
implementation "androidx.lifecycle:lifecycle-livedata:2.2.0"
testImplementation 'junit:junit:4.13'
androidTestImplementation 'androidx.test:runner:1.2.0'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
implementation 'com.google.firebase:firebase-auth:19.3.0'
implementation 'com.google.firebase:firebase-analytics:17.2.3'
implementation 'com.google.firebase:firebase-database:19.2.1'
implementation 'com.google.firebase:firebase-firestore:21.4.1'
implementation 'com.google.android.material:material:1.1.0'
implementation 'de.hdodenhof:circleimageview:3.1.0'
androidTestImplementation 'androidx.test.ext:junit:1.1.1'
implementation 'com.robertlevonyan.view:CustomFloatingActionButton:3.0.0'
implementation 'com.shuhart.stepview:stepview:1.5.1'
implementation 'com.alespero:expandable-cardview:0.8'
implementation 'com.anton46:stepsview:0.0.2'
implementation 'androidx.recyclerview:recyclerview:1.1.0'
implementation 'com.google.guava:guava:27.0.1-android'
implementation 'com.kofigyan.stateprogressbar:stateprogressbar:1.0.0'
implementation 'androidx.navigation:navigation-fragment:2.2.1'
implementation 'androidx.navigation:navigation-ui:2.2.1'
implementation "androidx.fragment:fragment:1.3.0-alpha01"
}
和我的build.gradle(project)文件。
buildscript {
repositories {
google()
jcenter()
maven { url "https://jitpack.io" }
}
dependencies {
classpath 'com.android.tools.build:gradle:3.6.1'
classpath 'com.google.gms:google-services:4.3.3'
def nav_version = "2.3.0-alpha03"
classpath "androidx.navigation:navigation-safe-args-gradle-plugin:$nav_version"
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}
allprojects {
repositories {
google()
jcenter()
maven { url "https://jitpack.io" }
}
}
task clean(type: Delete) {
delete rootProject.buildDir
}
我的导航图xml 代码在这里。
<?xml version="1.0" encoding="utf-8"?> <br/>
<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"
android:id="@+id/nav_graph"
app:startDestination="@id/signInFragment">
<fragment
android:id="@+id/signInFragment"
android:name="com.example.nibotransporti.Fragment.SignInFragment"
android:label="fragment_sign_in"
tools:layout="@layout/fragment_sign_in" >
<action
android:id="@+id/action_registration"
app:destination="@id/signUpFragment">
<argument
android:name="email"
android:defaultValue="3"
app:argType="string" />
</action>
<action
android:id="@+id/action_signInFragment_to_workerAnalyticsFragment"
app:destination="@id/workerAnalyticsFragment" />
</fragment>
<fragment
android:id="@+id/signUpFragment"
android:name="com.example.nibotransporti.Fragment.SignUpFragment"
android:label="fragment_sign_up"
tools:layout="@layout/fragment_sign_up">
<action
android:id="@+id/action_signUpFragment_to_signInFragment"
app:destination="@id/signInFragment">
<argument
android:name="email"
android:defaultValue="ten"
app:argType="string" />
<argument
android:name="password"
android:defaultValue="wen"
app:argType="string" />
</action>
</fragment>
<fragment
android:id="@+id/workerAnalyticsFragment"
android:name="com.example.nibotransporti.Fragment.WorkerAnalyticsFragment"
android:label="WorkerAnalyticsFragment"
tools:layout="@layout/fragment_woker_analytics"/>
<fragment
android:id="@+id/reportFragment"
android:name="com.example.nibotransporti.Fragment.ReportFragment"
android:label="fragment_stock"
tools:layout="@layout/fragment_stock" />
</navigation>
即使在多次尝试构建项目之后，目标片段的args类也没有创建。
这是我的动作发起片段的代码（SignUpFragment）
SignUpFragmentDirections.ActionSignUpFragmentToSignInFragment action =
SignUpFragmentDirections.actionSignUpFragmentToSignInFragment();
action.setEmail(email);
action.setPassword(password);
这是我要访问这些args的片段（SignInFragment）的目标代码。电子邮件和密码。
SignInFragmentArgs.getArguments().getString()
//Set up the navigation for the appropriate action
Navigation.findNavController(v).navigate(action);
根据官方文档，应该在构建项目期间生成SignInFragmentArgs代码，但它不是，我遇到了严重的麻烦，因为我想从SignUpFragment访问那些传递的参数电子邮件和密码，但我找不到SignInFragmentArgs类，这意味着它是在构建过程中不会生成。
请在这里的任何人我需要解决方案。