问题
How can I solve this problem. I can't make this data binding work, I have tried everything. Build.gradle(module app)
apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'
apply plugin: 'kotlin-kapt'
android {
compileSdkVersion 27
defaultConfig {
applicationId "com.fusion.alen.ask"
minSdkVersion 16
targetSdkVersion 27
multiDexEnabled true
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
vectorDrawables.useSupportLibrary = true
}
androidExtensions {
experimental = true
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
dataBinding {
enabled = true
}
}
dependencies {
implementation 'com.android.support:multidex:1.0.3'
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'com.android.support:appcompat-v7:27.1.1'
implementation 'com.android.support:animated-vector-drawable:27.1.1'
implementation 'com.android.support:support-vector-drawable:27.1.1'
implementation 'com.android.support:customtabs:27.1.1'
implementation 'com.android.support:cardview-v7:27.1.1'
implementation 'com.android.support:design:27.1.1'
implementation 'com.android.support.constraint:constraint-layout:1.1.3'
implementation 'com.android.support:recyclerview-v7:27.1.1'
implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
}
apply plugin: 'com.google.gms.google-services'
apply plugin: 'kotlin-android-extensions'
repositories {
mavenCentral()
}
I tried adding kapt "com.android.databinding:compiler:$compiler_version" but it gives me an error. Build.gradle(Module project)
// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
ext{
kotlin_version = '1.2.71'
compiler_version = '3.2.1'
}
repositories {
google()
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:3.2.1'
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
classpath 'com.google.gms:google-services:4.2.0'
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
}
}
allprojects {
repositories {
google()
jcenter()
}
}
This is my profile_fragment.xml, I have followed documentation instructions
<layout xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
xmlns:android="http://schemas.android.com/apk/res/android">
<data>
<variable
name="user"
type="com.alen.ask.UserModel.User" />
</data>
<android.support.constraint.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:layout_editor_absoluteY="25dp">
<LinearLayout
android:id="@+id/profile_box"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:background="@color/primaryColor"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/app_bar">
<LinearLayout
android:id="@+id/qff_box"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_weight="5"
android:orientation="horizontal"
android:baselineAligned="false">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_weight="1"
android:orientation="vertical">
<TextView
android:id="@+id/questions_number"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:textSize="18sp"
android:textStyle="bold"
**android:text="@{user.questionsNum}"************
tools:text="0" />
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_weight="1"
android:orientation="vertical">
<TextView
android:id="@+id/followers_number"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:textSize="18sp"
android:textStyle="bold"
**android:text="@{user.followersNum}"************
tools:text="0" />
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_weight="1"
android:orientation="vertical">
<TextView
android:id="@+id/following_number"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:textSize="18sp"
android:textStyle="bold"
**android:text="@{user.followingNum}"***********
tools:text="0" />
</LinearLayout>
</LinearLayout>
</LinearLayout>
<LinearLayout
android:id="@+id/app_bar"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:background="@color/primaryDarkColor"
android:orientation="horizontal"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<TextView
android:id="@+id/username_text"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginLeft="8dp"
android:layout_weight="1"
**android:text="@{user.name}"**
android:textColor="@color/primaryTextColor"
android:textSize="18sp"
android:layout_marginStart="8dp" />
</LinearLayout>
</android.support.constraint.ConstraintLayout>
</layout>
My User data class:
data class User(val name: String,
val email: String,
val uid: String,
val photo: String,
val postsList: ArrayList<String> = ArrayList(),
val questionsNum: Int = 0,
val followersNum: Int = 0,
val followingNum: Int = 0
)
This is inside ProfileFragmen class, in onCreateView method
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
val binding = ProfileFragmentBinding.inflate(inflater, container, false)
binding.user = user
}
That line binding.user = user gives me error: Cannot access class 'UserModel.User'. Check your module classpath for missing or conflicting dependencies How can I solve this, I have followed instructions from DataBinding documentation and I don't think I have made any mistake. I have tried cleaning and rebuilding the project, but it didn't work. I have tried adding those 'kapt' dependencies, didn't work.... File->ProjectStructure->Gradle version: 4.10.1, AndroidPluginVersion: 3.2.1, KotlinLanguageVersion: 1.2, KotlinPluginVersion: 1.2.71-release-Studio3.2-1
Thank you.
回答1:
Rename your folder UserModel to userModel then clean/rebuild your project. I had the same problem and the error disapeared when set my folder's first letter to lower case. In the future use camelCase for your folders name just like for variables. Upper case on the first letter is usually for classes.
回答2:
The reason is because one of your package name begins with Capital. The class name which uses databinding should begin with capital word and package name should start with lower case.
[Internally when dataBinding generates bindingImplementation for your xml, it parses your package name to identify the class, if the package name begins with capital it is not able to separate the Class name from the package name, and it throws an error.]
回答3:
At file profile_fragment.xml try to replace this
<data>
<variable
name="user"
type="com.alen.ask.UserModel.User" />
</data>
with this
<data>
<variable
name="user"
type="com.alen.ask.User" />
</data>
and give us a feedback.
回答4:
<data class="ProfileBinding">
<variable
name="user"
type="com.alen.ask.UserModel.User" />
</data>
use the above mentioned ProfileBinding class inside Fragment class to inflate
回答5:
Try to use binding.setVariable method.
来源：https://stackoverflow.com/questions/54571959/kotlin-databinding-error-check-your-module-classpath-for-missing-or-conflicting