android - "Unsupported ABI"chromium webview 错误

Question

我按照以下说明编译、安装并成功运行了基于 chromium 46(标签 46.0.2490.71)的自定义 webview:

https://www.chromium.org/developers/how-tos/android-build-instructions

并构建了忍者目标“system_webview_apk”。

而且效果很好!

现在我正尝试将它集成到我的基于 AOSP 构建的 lolipop 5.1.1_r29 的自定义 android 图像中。构建和安装步骤有效，但是当应用程序试图扩充 webview 时，出现以下错误:

E/AndroidRuntime:  Caused by: java.lang.IllegalArgumentException: Unsupported ABI: null
 at dalvik.system.VMRuntime.getInstructionSet(VMRuntime.java:324)
 at dalvik.system.VMRuntime.is64BitAbi(VMRuntime.java:337)
 at android.webkit.WebViewFactory.getWebViewNativeLibraryPaths(WebViewFactory.java:286)

(文章末尾的完整堆栈跟踪)

奇怪的是，如果我采用完全相同的 APK，并使用 ADB 安装它:

adb shell stop
adb pull /system/app/webview/webview.apk
adb shell rm -rf /system/app/webview/
adb shell start
adb install webview.apk

然后错误消失， WebView 正确显示。

接下来，如果我把它放回/system/app :

adb uninstall com.android.webview
adb push webview.apk /system/app/webview/webview.apk
adb shell stop
adb shell start

它再次失败并出现同样的错误。

我对“Unsupported ABI: null”的调查只给了我这个: https://code.google.com/p/chromium/issues/detail?id=559720

但好像不相关。

我需要在 android 5.1.1 上基于 chromium 46(至少)的 webview。

任何帮助、线索或建议将不胜感激:)

一些附加信息:

在 Nexus 6 上:

root@shamu:/ # ll /system/lib/libwebv*
-rw-r--r-- root     root     31282132 2008-04-15 23:40 libwebviewchromium.so
-rw-r--r-- root     root         5376 2015-12-09 15:51 libwebviewchromium_loader.so
-rw-r--r-- root     root         9532 2015-12-09 15:51 libwebviewchromium_plat_support.so

Chromium 构建配置:

$ cat chromium.gyp_env
{ 'GYP_DEFINES': 'target_arch=arm OS=android', }

$ cat .gclient
solutions = [
  { "name"        : "src",
    "url"         : "https://chromium.googlesource.com/chromium/src.git",
    "deps_file"   : "DEPS",
    "managed"     : False,
    "custom_deps" : {
    },
    "safesync_url": "",
  },
]
cache_dir = None
target_os = ["android"]

完整的堆栈跟踪:

 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.webviewui/com.example.webviewui.MainActivity}: android.view.InflateException: Binary XML file line #6: Error inflating class android.webkit.WebView
     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2325)
     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
     at android.app.ActivityThread.access$800(ActivityThread.java:151)
     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
     at android.os.Handler.dispatchMessage(Handler.java:102)
     at android.os.Looper.loop(Looper.java:135)
     at android.app.ActivityThread.main(ActivityThread.java:5254)
     at java.lang.reflect.Method.invoke(Native Method)
     at java.lang.reflect.Method.invoke(Method.java:372)
     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
  Caused by: android.view.InflateException: Binary XML file line #6: Error inflating class android.webkit.WebView
     at android.view.LayoutInflater.createView(LayoutInflater.java:633)
     at com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:55)
     at android.view.LayoutInflater.onCreateView(LayoutInflater.java:682)
     at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:741)
     at android.view.LayoutInflater.rInflate(LayoutInflater.java:806)
     at android.view.LayoutInflater.inflate(LayoutInflater.java:504)
     at android.view.LayoutInflater.inflate(LayoutInflater.java:414)
     at android.view.LayoutInflater.inflate(LayoutInflater.java:365)
     at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:378)
     at android.app.Activity.setContentView(Activity.java:2145)
     at com.example.webviewui.MainActivity.onCreate(MainActivity.java:48)
     at android.app.Activity.performCreate(Activity.java:5990)
     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278)
     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387) 
     at android.app.ActivityThread.access$800(ActivityThread.java:151) 
     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303) 
     at android.os.Handler.dispatchMessage(Handler.java:102) 
     at android.os.Looper.loop(Looper.java:135) 
     at android.app.ActivityThread.main(ActivityThread.java:5254) 
     at java.lang.reflect.Method.invoke(Native Method) 
     at java.lang.reflect.Method.invoke(Method.java:372) 
     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903) 
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698) 
  Caused by: java.lang.reflect.InvocationTargetException
     at java.lang.reflect.Constructor.newInstance(Native Method)
     at java.lang.reflect.Constructor.newInstance(Constructor.java:288)
     at android.view.LayoutInflater.createView(LayoutInflater.java:607)
     at com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:55) 
     at android.view.LayoutInflater.onCreateView(LayoutInflater.java:682) 
     at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:741) 
     at android.view.LayoutInflater.rInflate(LayoutInflater.java:806) 
     at android.view.LayoutInflater.inflate(LayoutInflater.java:504) 
     at android.view.LayoutInflater.inflate(LayoutInflater.java:414) 
     at android.view.LayoutInflater.inflate(LayoutInflater.java:365) 
     at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:378) 
     at android.app.Activity.setContentView(Activity.java:2145) 
     at com.example.webviewui.MainActivity.onCreate(MainActivity.java:48) 
     at android.app.Activity.performCreate(Activity.java:5990) 
     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106) 
     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278) 
     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387) 
     at android.app.ActivityThread.access$800(ActivityThread.java:151) 
     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303) 
     at android.os.Handler.dispatchMessage(Handler.java:102) 
     at android.os.Looper.loop(Looper.java:135) 
     at android.app.ActivityThread.main(ActivityThread.java:5254) 
     at java.lang.reflect.Method.invoke(Native Method) 
     at java.lang.reflect.Method.invoke(Method.java:372) 
     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903) 
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698) 
  Caused by: java.lang.IllegalArgumentException: Unsupported ABI: null
     at dalvik.system.VMRuntime.getInstructionSet(VMRuntime.java:324)
     at dalvik.system.VMRuntime.is64BitAbi(VMRuntime.java:337)
     at android.webkit.WebViewFactory.getWebViewNativeLibraryPaths(WebViewFactory.java:286)
     at android.webkit.WebViewFactory.loadNativeLibrary(WebViewFactory.java:397)
     at android.webkit.WebViewFactory.getProvider(WebViewFactory.java:103)
     at android.webkit.WebView.getFactory(WebView.java:2194)
     at android.webkit.WebView.ensureProviderCreated(WebView.java:2189)
     at android.webkit.WebView.setOverScrollMode(WebView.java:2248)
     at android.view.View.<init>(View.java:3588)
     at android.view.View.<init>(View.java:3682)
     at android.view.ViewGroup.<init>(ViewGroup.java:497)
     at android.widget.AbsoluteLayout.<init>(AbsoluteLayout.java:55)
     at android.webkit.WebView.<init>(WebView.java:544)
     at android.webkit.WebView.<init>(WebView.java:489)
     at android.webkit.WebView.<init>(WebView.java:472)
     at android.webkit.WebView.<init>(WebView.java:459)
     at java.lang.reflect.Constructor.newInstance(Native Method) 
     at java.lang.reflect.Constructor.newInstance(Constructor.java:288) 
     at android.view.LayoutInflater.createView(LayoutInflater.java:607) 
     at com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:55) 
     at android.view.LayoutInflater.onCreateView(LayoutInflater.java:682) 
     at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:741) 
     at android.view.LayoutInflater.rInflate(LayoutInflater.java:806) 
     at android.view.LayoutInflater.inflate(LayoutInflater.java:504) 
     at android.view.LayoutInflater.inflate(LayoutInflater.java:414) 
     at android.view.LayoutInflater.inflate(LayoutInflater.java:365) 
     at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:378) 
     at android.app.Activity.setContentView(Activity.java:2145) 
     at com.example.webviewui.MainActivity.onCreate(MainActivity.java:48) 
     at android.app.Activity.performCreate(Activity.java:5990) 
     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106) 
     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278) 
     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387) 
     at android.app.ActivityThread.access$800(ActivityThread.java:151) 
     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303) 
     at android.os.Handler.dispatchMessage(Handler.java:102) 
     at android.os.Looper.loop(Looper.java:135) 
     at android.app.ActivityThread.main(ActivityThread.java:5254) 
     at java.lang.reflect.Method.invoke(Native Method) 
     at java.lang.reflect.Method.invoke(Method.java:372) 
     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903) 
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)    

Answer 1

在为 arm 编译 WebView 时，Chromium(64.0.3282.134，可能还有其他版本)将以 armv7 为目标。这导致将 native 库放在 apk 中的 armeabi-v7a 文件夹下。当它安装在我的示例 armv7 Android 5.1.1 设备上时，Android 将运行 dex2opt 来处理 apk。这样做时，它将在 armeabi 文件夹下查找 native 库，而不是 armeabi-v7a 文件夹。因此，它永远找不到库，并且在启动 WebView 时失败。

Chromium 的消息来源有评论说它不再支持 armeabi，因此为此构建似乎不可行。我确实尝试为 arm 版本 6 显式构建并遇到编译失败。

我找到的解决方法是:

1. 解压构建的 Chromium webview apk
2. 将库文件夹从 armeabi-v7a 重命名为 armeabi
3. 将所有内容压缩备份，将生成的文件重命名为 apk。 (请注意，压缩时不要压缩内容。WebView 期望其某些 Assets 不会被压缩，而压缩它们会导致运行时失败)。
4. 使用 zipalign 和 apksigner 准备安装 apk
5. 安装生成的 apk 文件

这样做我观察到 Android 5.1.1 设备能够找到 native 库并在启动 WebView 时使用它们。