android - Android - Cardview 不显示阴影，也不剪裁儿童
问题描述
在项目中，我在 Recyclerview 视图持有者/项目内的 ConstraintLayout 中使用 cardviews。它在 android studio 预览中正常显示，但是当我在手机或模拟器中运行项目时，不显示 cardview 的阴影，并且 cardview 内的 imageview 也没有被裁剪。
此布局显示为普通平面布局，没有任何类型的阴影或剪裁。我该如何解决这个..？
布局.xml
<androidx.constraintlayout.widget.ConstraintLayout 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/parentLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/c_FFFFFF_white"
android:padding="@dimen/dimen_8">
<!--<FrameLayout
android:id="@+id/linearLayout"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="@dimen/dimen_34"
android:layout_marginTop="@dimen/dimen_24"
android:layout_marginEnd="@dimen/dimen_24"
android:layout_marginBottom="@dimen/dimen_24"
android:background="@drawable/bg_rounded_corner_with_shadow"
android:clipChildren="true"
android:gravity="center"
android:orientation="horizontal"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">-->
<androidx.cardview.widget.CardView
android:id="@+id/cardView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginStart="@dimen/dimen_34"
android:layout_marginTop="@dimen/dimen_24"
android:layout_marginEnd="@dimen/dimen_24"
android:layout_marginBottom="@dimen/dimen_24"
android:clipChildren="true"
android:clipToPadding="true"
app:cardCornerRadius="@dimen/dimen_8"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="@dimen/dimen_60dp"
android:orientation="horizontal">
<com.example.ui.widgets.appWidgets.AppTextView
android:id="@+id/titleTextView"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:layout_marginStart="@dimen/dimen_24"
android:layout_marginEnd="@dimen/dimen_24"
android:maxLines="1"
android:textColor="@color/black"
android:textSize="@dimen/text_size_12"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="@id/linkImageView"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<com.example.ui.widgets.appWidgets.AppImageView
android:id="@+id/linkImageView"
android:layout_width="70dp"
android:layout_height="match_parent"
android:scaleType="centerCrop"
android:src="@color/black_overlay"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.cardview.widget.CardView>
<!-- </FrameLayout>-->
<com.example.ui.widgets.custom.FontIconTextView
android:id="@+id/fontIconTextView"
android:layout_width="@dimen/dimen_32"
android:layout_height="@dimen/dimen_32"
android:background="@drawable/bg_circle_icon_font"
android:elevation="@dimen/dimen_16"
app:layout_constraintBottom_toTopOf="@+id/cardView"
app:layout_constraintEnd_toStartOf="@+id/cardView"
app:layout_constraintStart_toStartOf="@+id/cardView"
app:layout_constraintTop_toTopOf="@+id/cardView" />
</androidx.constraintlayout.widget.ConstraintLayout>
样式.xml
<style name="AppTheme" parent="Theme.MaterialComponents.DayNight.Bridge">
<item name="colorPrimary">@color/c_F5FCF9_cyan</item>
<item name="colorPrimaryDark">@color/c_F5FCF9_cyan</item>
<item name="colorAccent">@color/c_39B0E5_blue</item>
<item name="windowActionBar">false</item>
<item name="windowNoTitle">true</item>
</style>
构建.gradle
apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'
apply plugin: 'kotlin-kapt'
apply plugin: 'com.google.gms.google-services'
android {
compileSdkVersion 29
defaultConfig {
applicationId "com.example"
minSdkVersion 23
targetSdkVersion 29
versionCode 4967
versionName "3.0.0"
multiDexEnabled true
vectorDrawables.useSupportLibrary = true
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
debuggable false
multiDexEnabled true
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
debug {
debuggable true
}
}
compileOptions {
sourceCompatibility = "1.8"
targetCompatibility = "1.8"
}
kotlinOptions {
jvmTarget = JavaVersion.VERSION_1_8.toString()
}
sourceSets {
main {
res.srcDirs =
[
'src/main/res',
'src/main/res/layouts/login',
'src/main/res/layouts/dialog',
'src/main/res/layouts/learning',
'src/main/res/layouts/common',
'src/main/res/layouts/sideMenu',
'src/main/res/layouts/exercise',
'src/main/res/layouts/quiz',
'src/main/res/layouts/feedback',
'src/main/res/layouts/adapter',
'src/main/res/layouts/discussion',
'src/main/res/layouts/template',
'src/main/res/layouts/points',
'src/main/res/layouts/submission',
'src/main/res/layouts/team',
'src/main/res/layouts/audio',
'src/main/res/layouts/external',
'src/main/res/layouts/downloads',
'src/main/res/layouts/announcement',
'src/main/res/layouts'
]
assets.srcDirs = ['src/main/assets', 'src/main/assets/']
}
}
kapt {
generateStubs = true
}
androidExtensions {
experimental = true
}
packagingOptions {
pickFirst 'META-INF/*'
exclude 'META-INF/atomicfu.kotlin_module'
exclude 'META-INF/MANIFEST.MF'
}
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
implementation 'androidx.appcompat:appcompat:1.1.0'
implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
implementation 'androidx.lifecycle:lifecycle-extensions:2.2.0'
implementation 'androidx.legacy:legacy-support-v4:1.0.0'
implementation 'com.google.android.material:material:1.1.0'
implementation "com.android.support:exifinterface:29.1.0"
testImplementation 'junit:junit:4.12'
androidTestImplementation 'androidx.test:runner:1.2.0'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
implementation "com.squareup.retrofit2:retrofit:$rootProject.retrofitVersion"
implementation "com.squareup.retrofit2:converter-gson:$rootProject.retrofitVersion"
implementation "com.squareup.retrofit2:adapter-rxjava2:2.6.1"
// reactive
implementation "io.reactivex.rxjava2:rxjava:$rootProject.rxjava2Version"
//noinspection GradleDependency
implementation "io.reactivex.rxjava2:rxandroid:$rootProject.rxandroidVersion"
implementation 'com.squareup.okhttp3:logging-interceptor:4.4.0'
implementation 'com.squareup.okhttp3:okhttp-urlconnection:4.4.0'
implementation 'com.squareup.okhttp3:okhttp:4.4.0'
// Facebook Login only
implementation 'com.facebook.android:facebook-login:5.15.3'
// google play
implementation 'com.google.android.gms:play-services-auth:18.1.0'
//glide
implementation 'com.github.bumptech.glide:glide:4.9.0'
implementation 'androidx.recyclerview:recyclerview:1.1.0'
//JWPlayer
implementation 'com.longtailvideo.jwplayer:jwplayer-core:3.6.0'
implementation 'com.longtailvideo.jwplayer:jwplayer-common:3.6.0'
//Youtube Player ====> https://github.com/PierfrancescoSoffritti/android-youtube-player
implementation 'com.pierfrancescosoffritti.androidyoutubeplayer:core:10.0.4'
//Firebase
implementation 'com.google.firebase:firebase-analytics:17.4.4'
//Pusher
implementation 'com.pusher:pusher-java-client:2.0.2'
//Amazon S3
implementation('com.amazonaws:aws-android-sdk-mobile-client:2.15.+@aar') { transitive = true }
implementation 'com.amazonaws:aws-android-sdk-s3:2.15.2'
implementation 'com.amazonaws:aws-android-sdk-core:2.15.2'
implementation 'com.amazonaws:aws-android-sdk-cognito:2.7.+'
//In-App Updates
// This dependency is downloaded from the Google’s Maven repository.
// So, make sure you also include that repository in your project's build.gradle file.
implementation 'com.google.android.play:core:1.6.5'
//Kotlin coroutines
implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.3.3'
//Room DB
implementation "androidx.room:room-runtime:$rootProject.roomVersion"
implementation "androidx.room:room-ktx:$rootProject.roomVersion"
kapt "androidx.room:room-compiler:$rootProject.roomVersion"
androidTestImplementation "androidx.room:room-testing:$rootProject.roomVersion"
//viewmodel extension
implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:$rootProject.archLifecycleVersion"
implementation "org.jsoup:jsoup:1.12.1"
debugImplementation 'im.dino:dbinspector:4.0.0'
}
解决方案
现在问题已解决。出于某种原因，我有
android:hardwareAccelerated="false"
为活动。我删除了这一行，问题解决了。
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