BottomSheetBehavior不在androidX库中

Question

我正在使用BottomSheetBehavior原始支持库:

implementation 'com.android.support:design:27.1.1' 

当我迁移使用新androidx库时虽然BottomSheetBehavior缺少了.上述支持库的映射也不在AndroidX重构列表中,但迁移工具将其删除.

我错过了将BottomSheetBehavior包含在新androidx库中.

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.google.android.material:material:1.0.0-beta01'
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"

    // ReactiveX
    implementation 'io.reactivex.rxjava2:rxandroid:2.0.2'
    implementation 'io.reactivex.rxjava2:rxkotlin:2.2.0'

    implementation 'com.android.support:design:28.1.0'

    // Android Compatability Libraries
    // Version: https://developer.android.com/topic/libraries/support-library/refactor
    implementation 'androidx.appcompat:appcompat:1.0.0-beta01'
    implementation 'androidx.constraintlayout:constraintlayout:2.0.0-alpha1'
    implementation 'androidx.legacy:legacy-support-v4:1.0.0-beta01'
    implementation 'androidx.lifecycle:lifecycle-extensions:2.0.0-beta01'
    implementation 'androidx.recyclerview:recyclerview:1.0.0-beta01'

    // Android Navigation Component
    // Check here for updated version info - will move to androidx soon.
    // https://developer.android.com/topic/libraries/architecture/adding-components
    def nav_version = "1.0.0-alpha04"

    // use -ktx for Kotlin
    implementation "android.arch.navigation:navigation-fragment-ktx:$nav_version"
    implementation "android.arch.navigation:navigation-ui-ktx:$nav_version"
    androidTestImplementation "android.arch.navigation:navigation-testing-ktx:$nav_version"

    // Testing
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test:runner:1.1.0-alpha4'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.0-alpha4'
}

Answer 1

事实证明,Android Studio中的重构工具Refactor > Migrate to AndroidX没有正确地为BottomSheetBehaviour迁移XML.

旧位置是android.support.design.widget.BottomSheetBehavior,并且未被迁移工具修改.原始XML是:

<fragment
    android:id="@+id/player_bottom_sheet_fragment"
    android:name="app.rxsongbrowsertrials.ui.player.PlayerToggleFragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:behavior_hideable="false"
    app:behavior_peekHeight="56dp"
    app:layout_behavior="android.support.design.widget.BottomSheetBehavior"
    />

新的位置是com.google.android.material.bottomsheet.BottomSheetBehavior,所以布局需要成为:

<fragment
    android:id="@+id/player_bottom_sheet_fragment"
    android:name="app.rxsongbrowsertrials.ui.player.PlayerToggleFragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:behavior_hideable="false"
    app:behavior_peekHeight="56dp"
    app:layout_behavior="com.google.android.material.bottomsheet.BottomSheetBehavior"
    />

Answer 2

你也可以替换

    app:layout_behavior="com.google.android.material.bottomsheet.BottomSheetBehavior"
or 
    app:layout_behavior="android.support.design.widget.BottomSheetBehavior"

通过

app:layout_behavior="@string/bottom_sheet_behavior"

Answer 3

您必须导入Google 提供的Material Components Library。

适用于 Android 的 Material Components 是 Android 设计支持库的直接替代品。

添加您的build.gradle：

implementation 'com.google.android.material:material:x.x.x'

然后使用类com.google.android.material.bottomsheet.BottomSheetBehavior。

在您的布局中，您可以使用该属性：

    app:layout_behavior="com.google.android.material.bottomsheet.BottomSheetBehavior"
    ..>

或者

app:layout_behavior="@string/bottom_sheet_behavior"