Recycleview displaying a grey area

问题

the RecyclerView is not shown as in the picture below and i cannot find any solution. What i tried:

Rebuild
Clean project
Invalidate Cache

My build.gradle(Module:app)

apply plugin: 'com.android.application'

android {
    compileSdkVersion 28
    defaultConfig {
        applicationId "com.user.myapplication"
        minSdkVersion 15
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(include: ['*.jar'], dir: 'libs')
    implementation 'com.android.support:appcompat-v7:28.0.0'
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
    implementation 'com.android.support:recyclerview-v7:28.0.0'
    implementation 'com.android.support:cardview-v7:28.0.0'
}

This is the activity_main.xml shown in the picutre

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    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"
    android:padding="8dp">

    <android.support.v7.widget.RecyclerView
        android:layout_width="match_parent"
        android:layout_height="match_parent">


    </android.support.v7.widget.RecyclerView>

</LinearLayout>

回答1:

Well, 28.0.0 support library-APIs dependency actually works better with Android Studio 3.2.0 and up and this is because of AndroidX migrating.

So, upgrading Android Studio will help since you already added RecyclerView dependency and there were no issues with the preview nor, no errors shown.

回答2:

The way I got rid of my gray recyclerview was pasting 'com.android.support:recyclerview-v7:28.0.0' to dependencies. Sorry in case this is what you did to begin with!

There is another way to do it which is clicking on the little download icon that appears next to recyclerview when you search for it but that always results in the grey screen for me.

来源：https://stackoverflow.com/questions/52611446/recycleview-displaying-a-grey-area

标签

android

android-recyclerview