小编ian*_*ake的帖子

I recently downloaded Android Studio Bumblebee and it helpfully asked whether I wanted to upgrade to Android Gradle Plugin 7.1.0, the version that shipped alongside Android Studio Bumblebee.

After upgrading, I get a build error:

Unable to load class 'com.android.build.api.extension.AndroidComponentsExtension'.

This is an unexpected error. Please file a bug containing the idea.log file.

And looking at the idea.log file, I see:

A problem occurred evaluating project ':main'.
    at org.gradle.initialization.exception.DefaultExceptionAnalyser.transform(DefaultExceptionAnalyser.java:103)
    ...
Caused by: org.gradle.api.GradleScriptException: A problem occurred evaluating project ':main'.
    at …

我想从Material设计滚动技术中实现"具有重叠内容的灵活空间"模式,例如在此视频中:

我的XML布局现在看起来像:

<android.support.design.widget.CoordinatorLayout 
    android:layout_width="match_parent"
    android:layout_height="match_parent">

  <android.support.design.widget.AppBarLayout
      android:layout_width="match_parent"
      android:layout_height="192dp"
      android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

    <android.support.design.widget.CollapsingToolbarLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_scrollFlags="scroll|exitUntilCollapsed">

      <android.support.v7.widget.Toolbar
          android:layout_height="?attr/actionBarSize"
          android:layout_width="match_parent"
          app:layout_collapseMode="pin"/>
    </android.support.design.widget.CollapsingToolbarLayout>
  </android.support.design.widget.AppBarLayout>

  <android.support.v4.widget.NestedScrollView
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      app:layout_behavior="@string/appbar_scrolling_view_behavior">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">
      <....>
    </LinearLayout>
  </android.support.v4.widget.NestedScrollView>
</android.support.design.widget.CoordinatorLayout>

有没有一种简单的方法可以使用设计库实现这一目标？或者我是否必须构建自定义CoordinatorLayout.Behavior来执行此操作？

我一直在使用支持库23.2中添加的新BottomSheetDialog ,但我想更改对话框的默认高度.我知道它可能与behavior_peekHeight控制初始高度的属性有关,但是如何BottomSheetDialog在我无法直接访问BottomSheetBehavior？时设置它？

我正在使用Support Library 23.2中添加的支持向量drawable 和AppCompat.我正在使用带有app:srcCompat和内部的矢量绘图,StateListDrawable所以我可以将它们android:drawableLeft用于我的TextView.

自升级到AppCompat的23.3.0版本以来,只有向量app:srcCompat正在运行.每当我以另一种方式引用它时

FATAL EXCEPTION: main
 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.my.package.name/.MainActivity}: android.view.InflateException: Binary XML file line #8: Error inflating class Button
 ...
 Caused by: android.view.InflateException: Binary XML file line #8: Error inflating class Button
 ...
 Caused by: org.xmlpull.v1.XmlPullParserException: Binary XML file line #14: invalid drawable tag vector
  at android.graphics.d

改变了什么现在导致我的支持向量drawables在某些情况下失败？

我正在使用Android Paging Library,如下所述:https: //developer.android.com/topic/libraries/architecture/paging.html

但我也有一个EditText用于按名称搜索用户.

如何过滤分页库中的结果以仅显示匹配的用户？

即使在添加导航架构组件依赖项后,"新建资源"对话框也没有导航图的导航资源类型

def nav_version = '1.0.0-alpha01'
implementation "android.arch.navigation:navigation-fragment:$nav_version"
implementation "android.arch.navigation:navigation-ui:$nav_version"

我升级到 Jetpack Compose 1.0.0-alpha12 并开始遇到问题。

首先，setContent我使用的方法显示为已弃用。

从Alpha 12 发行说明中，我注意到它说：

ComponentActivity.setContent 已移至 androidx.activity:activity-compose 模块中的 androidx.activity.compose.setContent。( icf416 )

所以我删除了 myimport androidx.compose.ui.platform.setContent并将其切换为import androidx.activity.compose.setContent，从而删除了弃用。

但是，然后我收到一个错误消息：

w: Flag is not supported by this version of the compiler: -Xallow-jvm-ir-dependencies
w: ATTENTION!
This build uses unsafe internal compiler arguments:
-XXLanguage:+NonParenthesizedAnnotationsOnFunctionalTypes
This mode is not recommended for production use,
as no stability/compatibility guarantees are given on
compiler or generated code. Use it at your own risk!
e: Classes compiled by …

我想使用导航架构组件.

但我在导入safeargs方面遇到了问题

同步消息:

找不到androidx.navigation:safe-args-gradle-plugin:1.0.0-alpha01.在以下位置进行了搜索:
https://dl.google.com/dl/android/maven2/androidx/navigation/safe-args-gradle-plugin/1.0.0-alpha01/safe-args-gradle-plugin-1.0. 0-alpha01.pom
https://dl.google.com/dl/android/maven2/androidx/navigation/safe-args-gradle-plugin/1.0.0-alpha01/safe-args-gradle-plugin-1.0.0 -alpha01.jar
https://jcenter.bintray.com/androidx/navigation/safe-args-gradle-plugin/1.0.0-alpha01/safe-args-gradle-plugin-1.0.0-alpha01.pom
https:/ /jcenter.bintray.com/androidx/navigation/safe-args-gradle-plugin/1.0.0-alpha01/safe-args-gradle-plugin-1.0.0-alpha01.jar
要求:
项目:

我跟随添加组件到您的项目,但没有解决我的问题.

项目:build.gradle

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {

    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.1.2'
        classpath "androidx.navigation:safe-args-gradle-plugin:1.0.0-alpha01"

        // 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) { …

我有一个使用Androids ViewModel类和导航组件的应用程序,用于在片段之间导航.我如何处理ViewModel的导航？我正在使用RxJava,我正在考虑让Fragments监听导航事件,然后以这种方式触发导航.处理这个问题的正常方法是什么？如果有帮助,我也使用Dagger进行依赖注入.

我已经安装了最新的金丝雀版Android Studio,并按照此(https://developer.android.com/topic/libraries/architecture/navigation/navigation-implementing)说明实现了简单的两页导航.基本上page1有一个按钮,当它被点击时,应用程序显示page2.

它有效,但有一个问题......它似乎没有自动对动作栏做任何事情.是否应该通过导航库自动显示/返回箭头和操作栏上的"标签"属性？或者我应该像以前一样手动完成所有工作？我想在第2页显示时显示后退箭头和动作(工具)栏上的"详细信息".

在按钮上单击第1页.

override fun onViewCreated(view: View, savedInstanceState: Bundle?)
{
    button1.setOnClickListener {
        val nav = NavHostFragment.findNavController(this);
        nav.navigate(R.id.show_page2)
    }
}

主要活动XML.默认情况下,它是默认的操作栏,我用ToolBar替换它.没有区别.

<?xml version="1.0" encoding="utf-8"?>
<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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <androidx.appcompat.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_height="?attr/actionBarSize"
        android:elevation="4dp"
        android:background="?attr/colorPrimary"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        android:theme="@style/ThemeOverlay.AppCompat.ActionBar"
        app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
        android:layout_width="match_parent">
    </androidx.appcompat.widget.Toolbar>

    <fragment
        android:id="@+id/my_nav_host_fragment"
        android:name="androidx.navigation.fragment.NavHostFragment"
        android:layout_width="0dp"
        android:layout_height="0dp"
        app:defaultNavHost="true"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/toolbar"
        app:navGraph="@navigation/nav_graph"/>

</androidx.constraintlayout.widget.ConstraintLayout>

导航图XML.

<?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"
            android:id="@+id/nav_graph"
            app:startDestination="@id/page1">

    <activity
        android:id="@+id/mainActivity2"
        android:name="com.android.navtest.MainActivity"
        android:label="activity_main"
        tools:layout="@layout/activity_main"/>
    <fragment
        android:id="@+id/page1"
        android:name="com.android.navtest.BlankFragment2"
        android:label="Home page"
        tools:layout="@layout/page1">
        <action
            android:id="@+id/show_page2" …