蚂蚁，错误膨胀类android.support.v7.widget.RecyclerView

Question

Let's create a clean new project:

$ mkdir ApiTest
$ android create project --target android-22 --name ApiTest \
 --path ./ApiTest --activity MyActivity --package com.example.apitest

Only add RecyclerView to layout so res/layout/main.xml looks:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <android.support.v7.widget.RecyclerView
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/recycler_view"
        android:scrollbars="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>
</LinearLayout>

Copy support libraries from ${ANDROID_SDK_PATH}/extras/android/support/v7/ :

$ ls ApiTest/libs/
android-support-v4.jar            android-support-v7-cardview.jar
android-support-v7-appcompat.jar  android-support-v7-recyclerview.jar

Build & install:

$ ant debug
$ adb install -r bin/ApiTest-debug.apk

And when I open the Activity exception is raised:

09-28 20:02:02.346: E/AndroidRuntime(28688): FATAL EXCEPTION: main
09-28 20:02:02.346: E/AndroidRuntime(28688): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.apitest/com.example.apitest.MyActivity}: android.view.InflateException: Binary XML file line #7: Error inflating class android.support.v7.widget.RecyclerView
09-28 20:02:02.346: E/AndroidRuntime(28688):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2357)
09-28 20:02:02.346: E/AndroidRuntime(28688):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2419)
...

What is wrong here?

I compile on 64bit Fedora 21 using openjdk java compiler:

$ java -version
openjdk version "1.8.0_60"
OpenJDK Runtime Environment (build 1.8.0_60-b27)
OpenJDK 64-Bit Server VM (build 25.60-b23, mixed mode)

Answer 1

I overlooked that there are two types of Android Support Libraries. Libraries without resources (eg android-support-v4 ) and libraries with resources (eg appcompat and recyclerview ). See Adding Support Libraries .

To add recyclerview library (with resources) using command line and ant build tool first copy whole recyclerview directory from Android SDK directory to your project directory and update ant build files

$ cd ${ANDROID_PROJECT_DIR}
$ cp -r ${ANDROID_SDK_DIR}/extras/android/support/v7/recyclerview/ .
$ android update lib-project --path recyclerview --target android-22
$ android update project --path . -l recyclerview

The third command should add line android.library=true to recyclerview/project.properties which in my case didn't so I added it manually. When I tried it with appcompat library it work as expected.

Another thing is that in the recyclerview/src directory was missing. So simply create

$ mkdir recyclerview/src

And that is it. Now it compiles and runs.

$ ant clean && ant debug && adb install -r bin/ApiTest-debug.apk

These links helped me:

• How to add Android libraries with resources without using Eclipse
• Compiling android project with a library project fails with missing classes.jar