Android 处理WebView not install(源码分析定位)
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最近在处理游戏项目中Bugly上的bug, 发现一个WebView Installed问题，涉及FrameWork层中WebView的部分细节，记录下来。
Bugly上捕捉的日志：
08-27 06:20:16.860 17374 17374 E WebViewFactory: Chromium WebView package does not exist
10708-27 06:20:16.860 17374 17374 E WebViewFactory: android.webkit.WebViewFactory$MissingWebViewPackageException: Failed to load WebView provider: No WebView installed
10808-27 06:20:16.860 17374 17374 E WebViewFactory: at android.webkit.WebViewFactory.getWebViewContextAndSetProvider(WebViewFactory.java:270)
10908-27 06:20:16.860 17374 17374 E WebViewFactory: at android.webkit.WebViewFactory.getProviderClass(WebViewFactory.java:330)
11008-27 06:20:16.860 17374 17374 E WebViewFactory: at android.webkit.WebViewFactory.getProvider(WebViewFactory.java:194)
11108-27 06:20:16.860 17374 17374 E WebViewFactory: at android.webkit.WebView.getFactory(WebView.java:2325)
11208-27 06:20:16.860 17374 17374 E WebViewFactory: at android.webkit.WebView.ensureProviderCreated(WebView.java:2320)
11308-27 06:20:16.860 17374 17374 E WebViewFactory: at android.webkit.WebView.setOverScrollMode(WebView.java:2379)
11408-27 06:20:16.860 17374 17374 E WebViewFactory: at android.view.View.<init>(View.java:4023)
11508-27 06:20:16.860 17374 17374 E WebViewFactory: at android.view.View.<init>(View.java:4146)
11608-27 06:20:16.860 17374 17374 E WebViewFactory: at android.view.ViewGroup.<init>(ViewGroup.java:580)
11708-27 06:20:16.860 17374 17374 E WebViewFactory: at android.widget.AbsoluteLayout.<init>(AbsoluteLayout.java:55)
11808-27 06:20:16.860 17374 17374 E WebViewFactory: at android.webkit.WebView.<init>(WebView.java:627)
11908-27 06:20:16.860 17374 17374 E WebViewFactory: at android.webkit.WebView.<init>(WebView.java:572)
12008-27 06:20:16.860 17374 17374 E WebViewFactory: at android.webkit.WebView.<init>(WebView.java:555)
12108-27 06:20:16.860 17374 17374 E WebViewFactory: at android.webkit.WebView.<init>(WebView.java:542)
12208-27 06:20:16.860 17374 17374 E WebViewFactory: at java.lang.reflect.Constructor.newInstance0(Native Method)
12308-27 06:20:16.860 17374 17374 E WebViewFactory: at java.lang.reflect.Constructor.newInstance(Constructor.java:430)
12408-27 06:20:16.860 17374 17374 E WebViewFactory: at android.view.LayoutInflater.createView(LayoutInflater.java:645)
12508-27 06:20:16.860 17374 17374 E WebViewFactory: at com.android.internal.policy.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:58)
12608-27 06:20:16.860 17374 17374 E WebViewFactory: at android.view.LayoutInflater.onCreateView(LayoutInflater.java:717)
12708-27 06:20:16.860 17374 17374 E WebViewFactory: at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:785)
12808-27 06:20:16.860 17374 17374 E WebViewFactory: at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:727)
12908-27 06:20:16.860 17374 17374 E WebViewFactory: at android.view.LayoutInflater.rInflate(LayoutInflater.java:858)
13008-27 06:20:16.860 17374 17374 E WebViewFactory: at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:821)
13108-27 06:20:16.860 17374 17374 E WebViewFactory: at android.view.LayoutInflater.rInflate(LayoutInflater.java:861)
13208-27 06:20:16.860 17374 17374 E WebViewFactory: at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:821)
13308-27 06:20:16.860 17374 17374 E WebViewFactory: at android.view.LayoutInflater.rInflate(LayoutInflater.java:861)
13408-27 06:20:16.860 17374 17374 E WebViewFactory: at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:821)
13508-27 06:20:16.860 17374 17374 E WebViewFactory: at android.view.LayoutInflater.rInflate(LayoutInflater.java:861)
13608-27 06:20:16.860 17374 17374 E WebViewFactory: at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:821)
13708-27 06:20:16.860 17374 17374 E WebViewFactory: at android.view.LayoutInflater.inflate(LayoutInflater.java:518)
13808-27 06:20:16.860 17374 17374 E WebViewFactory: at android.view.LayoutInflater.inflate(LayoutInflater.java:426)
13908-27 06:20:16.860 17374 17374 E WebViewFactory: at android.view.LayoutInflater.inflate(LayoutInflater.java:377)
14008-27 06:20:16.860 17374 17374 E WebViewFactory: at android.view.View.inflate(View.java:21010)
14108-27 06:20:16.860 17374 17374 E WebViewFactory: at com.duoku.platform.single.ui.DKVerifyActivity.onCreate(Native Method)
14208-27 06:20:16.860 17374 17374 E WebViewFactory: at android.app.Activity.performCreate(Activity.java:6679)
14308-27 06:20:16.860 17374 17374 E WebViewFactory: at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
14408-27 06:20:16.860 17374 17374 E WebViewFactory: at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2618)
14508-27 06:20:16.860 17374 17374 E WebViewFactory: at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726)
14608-27 06:20:16.860 17374 17374 E WebViewFactory: at android.app.ActivityThread.-wrap12(ActivityThread.java)
14708-27 06:20:16.860 17374 17374 E WebViewFactory: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1477)
14808-27 06:20:16.860 17374 17374 E WebViewFactory: at android.os.Handler.dispatchMessage(Handler.java:102)
14908-27 06:20:16.860 17374 17374 E WebViewFactory: at android.os.Looper.loop(Looper.java:154)
15008-27 06:20:16.860 17374 17374 E WebViewFactory: at android.app.ActivityThread.main(ActivityThread.java:6119)
15108-27 06:20:16.860 17374 17374 E WebViewFactory: at java.lang.reflect.Method.invoke(Native Method)
15208-27 06:20:16.860 17374 17374 E WebViewFactory: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:969)
15308-27 06:20:16.860 17374 17374 E WebViewFactory: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:859)
| 设备机型 | 系统版本 | ROM |
|---|---|---|
| NX16A8116KP | Android 7.1.1,level 25 | NextBook/NX16A8116KP |
1.源码分析
本篇源码，基于Android7.1 来介绍。
从WebViewFactory#getWebViewContextAndSetProvider开始看起：
/frameworks/base/core/java/android/webkit/WebViewFactory.java
private static Context getWebViewContextAndSetProvider()
try
WebViewProviderResponse response = null;
response = getUpdateService().waitForAndGetProvider();
if (response.status != LIBLOAD_SUCCESS
&& response.status != LIBLOAD_FAILED_WAITING_FOR_RELRO)
// 报错点
throw new MissingWebViewPackageException("Failed to load WebView provider: "
+ getWebViewPreparationErrorReason(response.status));
//... 省略部分源码
catch (RemoteException | PackageManager.NameNotFoundException e)
throw new MissingWebViewPackageException("Failed to load WebView provider: " + e);
public static final int LIBLOAD_FAILED_LISTING_WEBVIEW_PACKAGES = 4;
//根据status 获取error msg
private static String getWebViewPreparationErrorReason(int error)
switch (error)
case LIBLOAD_FAILED_LISTING_WEBVIEW_PACKAGES:
return "No WebView installed"; // 匹配上报错信息
return "Unknown";
从上可知,调用WebViewUpdateService #waitForAndGetProvider() 返回status 是4，因此抛出MissingWebViewPackageException异常。
App进程是通过跨进程方式来获取WebView有关数据,接下来看下WebView的Server端WebViewUpdateService。
接下来看下waitForAndGetProvider()：
/frameworks/base/services/core/java/com/android/server/webkit/WebViewUpdateService.java
@Override // 该方法是Binder 调用
public WebViewProviderResponse waitForAndGetProvider()
//...
return WebViewUpdateService.this.mImpl.waitForAndGetProvider();
从上可知,WebViewUpdateService 是通过WebViewUpdateServiceImpl对象来真正操作WebView有关数据的。
这里涉及是代理方式，提供Sevice api 层,真正的操作是在Impl中。
/frameworks/base/services/core/java/com/android/server/webkit/WebViewUpdateServiceImpl.java
WebViewProviderResponse waitForAndGetProvider()
return mWebViewUpdater.waitForAndGetProvider();
从上可知,WebViewUpdateServiceImpl对象是通过调用WebViewUpdater对象来进行有关操作。
接下来看下，WebViewUpdateServiceImpl#WebViewUpdater静态内部类中：
private static final int WAIT_TIMEOUT_MS = 1000; // KEY_DISPATCHING_TIMEOUT is 5000.
public WebViewProviderResponse waitForAndGetProvider()
PackageInfo webViewPackage = null;
final long NS_PER_MS = 1000000;
final long timeoutTimeMs = System.nanoTime() / NS_PER_MS + WAIT_TIMEOUT_MS;
boolean webViewReady = false;
int webViewStatus = WebViewFactory.LIBLOAD_SUCCESS; // 默认是加载成功的状态
synchronized (mLock)
webViewReady = webViewIsReadyLocked();
while (!webViewReady) // 这里通过周期性循环阻塞，等待webview load 状态
final long timeNowMs = System.nanoTime() / NS_PER_MS;
if (timeNowMs >= timeoutTimeMs) break;
try
mLock.wait(timeoutTimeMs - timeNowMs);
catch (InterruptedException e)
webViewReady = webViewIsReadyLocked();
// Make sure we return the provider that was used to create the relro file
webViewPackage = mCurrentWebViewPackage;
if (webViewReady)
else if (!mAnyWebViewInstalled)
//关键点：发现没有webview install
webViewStatus = WebViewFactory.LIBLOAD_FAILED_LISTING_WEBVIEW_PACKAGES;
else
//当前WebView的relro 创建没有完成的状态，超时等待
webViewStatus = WebViewFactory.LIBLOAD_FAILED_WAITING_FOR_RELRO;
if (!webViewReady) Slog.w(TAG, "creating relro file timed out");
return new WebViewProviderResponse(webViewPackage, webViewStatus);
从上可知,会先检查WebView 是否load 状态，若是没有，则会等待1000毫秒,若是还没loady 成功，则会判定为LIBLOAD_FAILED_WAITING_FOR_RELRO 。
若是没有install,则会判定为LIBLOAD_FAILED_LISTING_WEBVIEW_PACKAGES。
app 端调用webview Server端返回的status 是LIBLOAD_FAILED_LISTING_WEBVIEW_PACKAGES。因此,WebView Server端 中mAnyWebViewInstalled 是为false。
接下来，全局检索下mAnyWebViewInstalled是如何赋值的。
找到findPreferredWebViewPackage() 中会去对 mAnyWebViewInstalled赋值false。
private PackageInfo findPreferredWebViewPackage()
//获取到webview 的信息列表
ProviderAndPackageInfo[] providers =
getValidWebViewPackagesAndInfos(false /* onlyInstalled */);
String userChosenProvider = mSystemInterface.getUserChosenWebViewProvider(mContext);
//选择用户选择的webview
for (ProviderAndPackageInfo providerAndPackage : providers)
if (providerAndPackage.provider.packageName.equals(userChosenProvider)
&& isInstalledPackage(providerAndPackage.packageInfo)
&& isEnabledPackage(providerAndPackage.packageInfo))
return providerAndPackage.packageInfo;
//当用户没选择或者选择错误,使用安装可使用且注册条件是availableByDefault=true 的webview(列表中第一个)
for (ProviderAndPackageInfo providerAndPackage : providers)
if (providerAndPackage.provider.availableByDefault
&& isInstalledPackage(providerAndPackage.packageInfo)
&& isEnabledPackage(providerAndPackage.packageInfo))
return providerAndPackage.packageInfo;
//当没有可用或者安装的webview,使用默认availableByDefault=true的webview 。
for (ProviderAndPackageInfo providerAndPackage : providers)
if (providerAndPackage.provider.availableByDefault)
return providerAndPackage.packageInfo;
//没有availableByDefault=true的情况下,赋值false
mAnyWebViewInstalled = false;
throw new WebViewFactory.MissingWebViewPackageException(
"Could not find a loadable WebView package");
从上可知,当没有availableByDefault=true的情况下, mAnyWebViewInstalled 会被赋值false。
接下来看下,getValidWebViewPackagesAndInfos()获取可用的Webview Provider包信息：
private ProviderAndPackageInfo[] getValidWebViewPackagesAndInfos(boolean onlyInstalled)
WebViewProviderInfo[] allProviders = mSystemInterface.getWebViewPackages();
List<ProviderAndPackageInfo> providers = new ArrayList<>();
for(int n = 0; n < allProviders.length; n++)
try
PackageInfo packageInfo =
mSystemInterface.getPackageInfoForProvider(allProviders[n]);
if ((!onlyInstalled || isInstalledPackage(packageInfo))
&& isValidProvider(allProviders[n], packageInfo)) // 这里传入onlyInstalled为false,添加全部
providers.add(new ProviderAndPackageInfo(allProviders[n], packageInfo));
catch (NameNotFoundException e)
// Don't add non-existent packages
return providers.toArray(new ProviderAndPackageInfo[providers.size()]);
SystemImpl是SystemInterface接口的实现类。
接下来看下,SystemImpl中getWebViewPackages()：
/frameworks/base/services/core/java/com/android/server/webkit/SystemImpl.java
/**
* Returns all packages declared in the framework resources as potential WebView providers.
* @hide
* */
@Override
public WebViewProviderInfo[] getWebViewPackages()
return mWebViewProviderPackages;
通过检索，发现是SystemImpl构造函数中解析xml,对mWebViewProviderPackages进行赋值操作
private final WebViewProviderInfo[] mWebViewProviderPackages;
private SystemImpl()
int numFallbackPackages = 0;
int numAvailableByDefaultPackages = 0;
int numAvByDefaultAndNotFallback = 0;
XmlResourceParser parser = null;
List<WebViewProviderInfo> webViewProviders = new ArrayList<WebViewProviderInfo>();
try
parser = AppGlobals.getInitialApplication().getResources().getXml(
com.android.internal.R.xml.config_webview_packages); // 解析xml 中Webview Provider信息
XmlUtils.beginDocument(parser, TAG_START);
while(true) //循环解析
XmlUtils.nextElement(parser);
String element = parser.getName();
if (element == null)
break;
if (element.equals(TAG_WEBVIEW_PROVIDER)) //解析webviewproviders 标签
String packageName = parser.getAttributeValue(null, TAG_PACKAGE_NAME);
//...
boolean availableByDefault = "true".equals(
parser.getAttributeValue(null, TAG_AVAILABILITY));
boolean isFallback = "true".equals(
parser.getAttributeValue(null, TAG_FALLBACK));
WebViewProviderInfo currentProvider = new WebViewProviderInfo(
packageName, description, availableByDefault, isFallback,
readSignatures(parser));
//统计isFallback="true"的情况
if (currentProvider.isFallback)
numFallbackPackages++;
// 不允许存在availableByDefault="false"的情况
if (!currentProvider.availableByDefault)
throw new AndroidRuntimeException(
"Each WebView fallback package must be available by default.");
// 最多允许一个isFallback="true"的情况
if (numFallbackPackages > 1)
throw new AndroidRuntimeException(
"There can be at most one WebView fallback package.");
//统计 availableByDefault="true"且isFallback="false"的情况
if (currentProvider.availableByDefault)
numAvailableByDefaultPackages++;
if (!currentProvider.isFallback)
numAvByDefaultAndNotFallback++;
webViewProviders.add(currentProvider);
else
Log.e(TAG, "Found an element that is not a WebView provider");
catch (XmlPullParserException | IOException e)
throw new AndroidRuntimeException("Error when parsing WebView config " + e);
finally
if (parser != null) parser.close();
// 必须存在一个availableByDefault="true"且isFallback="false"的默认WebViewProvider
if (numAvailableByDefaultPackages == 0)
throw new AndroidRuntimeException("There must be at least one WebView package "
+ "that is available by default");
if (numAvByDefaultAndNotFallback == 0)
throw new AndroidRuntimeException("There must be at least one WebView package "
+ "that is available by default and not a fallback");
mWebViewProviderPackages =
webViewProviders.toArray(new WebViewProviderInfo[webViewProviders.size()]);
从上可知，SystemImpl 是解析config_webview_packages.xml来获取到可用的webview Provider 信息的。
新增的WebviewProvider 必须是availableByDefault="true"且isFallback="true"的注册，或者替换掉默认的webviewprovider。
接下来,看下Webview Provider的配置文件：
/frameworks/base/core/res/res/xml/config_webview_packages.xml
<webviewproviders>
<!-- The default WebView implementation -->
<webviewprovider description="Android WebView" packageName="com.android.webview" availableByDefault="true">
</webviewprovider>
</webviewproviders>
一般系统默认的是com.android.webview,处于首个availableByDefault="true"的webviewprovider的优先级最高。
2.分析原因
对该国产ROM的猜测：
国产手机厂商肯定对config_webview_packages进行改动，添加了厂商自带的WebView。
查看方式：
先执行adb pull system/framework/framework.apk 先获取到包含该xml 的resource资源，
接着执行aapt d xmltree framework-res.apk res/xml/config_webview_packages.xml命令便可打开该xml ，查看当前手机ROM 中webview的配置项。
除此之外，也可以通过执行adb shell "pm list packages | grep webview"来查看当前手机安装了哪些webview包程序：
3.解决方案
自定义WebView，重写setOverScrollMode(),捕捉该异常。
public class FixWebView extends WebView
//...
@Override
public void setOverScrollMode(int mode)
try
super.setOverScrollMode(mode);
catch (Exception e)
// 若是发生webview 有关的crash ，则表明system webview 正在更新或者不存在(部分机型上可能存在该问题)
if (e != null && e.getMessage()!=null&&e.getMessage().toLowerCase().contains("webview"))
e.printStackTrace();
else
throw e;
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