我在三星Tab 8.9上尝试一个简单的StackTrace项目时记录了WebView
04-04 13:32:26.688: D/core(9992): core.cpp 228 bind alias=User
04-04 13:32:26.708: W/webview(9992): java.lang.Throwable: Warning: A WebView method was called on thread 'WebViewCoreThread'. All WebView methods must be called on the UI thread. Future versions of WebView may not support use on other threads.
04-04 13:32:26.708: W/webview(9992): at android.webkit.WebView.checkThread(WebView.java:14244)
04-04 13:32:26.708: W/webview(9992): at android.webkit.WebView.getSettings(WebView.java:5378)
04-04 13:32:26.708: W/webview(9992): at android.webkit.WebView.getVisibleTitleHeightImpl(WebView.java:2343)
04-04 13:32:26.708: W/webview(9992): at android.webkit.WebView.getViewHeight(WebView.java:2385)
04-04 13:32:26.708: W/webview(9992): at android.webkit.WebViewCore.setupViewport(WebViewCore.java:3422)
04-04 13:32:26.708: W/webview(9992): at android.webkit.WebViewCore.didFirstLayout(WebViewCore.java:3149)
04-04 13:32:26.708: W/webview(9992): at android.webkit.JWebCoreJavaBridge.nativeServiceFuncPtrQueue(Native Method)
04-04 13:32:26.708: W/webview(9992): at android.webkit.JWebCoreJavaBridge.handleMessage(JWebCoreJavaBridge.java:113)
04-04 13:32:26.708: W/webview(9992): at android.os.Handler.dispatchMessage(Handler.java:99)
04-04 13:32:26.708: W/webview(9992): at android.os.Looper.loop(Looper.java:137)
04-04 13:32:26.708: W/webview(9992): at android.webkit.WebViewCore$WebCoreThread.run(WebViewCore.java:828)
04-04 13:32:26.708: W/webview(9992): at java.lang.Thread.run(Thread.java:856)
04-04 13:32:26.718: W/webview(9992): java.lang.Throwable: Warning: A WebView method was called on thread 'WebViewCoreThread'. All WebView methods must be called on the UI thread. Future versions of WebView may not support use on other threads.
04-04 13:32:26.718: W/webview(9992): at android.webkit.WebView.checkThread(WebView.java:14244)
04-04 13:32:26.718: W/webview(9992): at android.webkit.WebView.getSettings(WebView.java:5378)
04-04 13:32:26.718: W/webview(9992): at android.webkit.WebView.getVisibleTitleHeightImpl(WebView.java:2343)
04-04 13:32:26.718: W/webview(9992): at android.webkit.WebView.getViewHeight(WebView.java:2385)
04-04 13:32:26.718: W/webview(9992): at android.webkit.WebViewCore.setupViewport(WebViewCore.java:3422)
04-04 13:32:26.718: W/webview(9992): at android.webkit.WebViewCore.didFirstLayout(WebViewCore.java:3149)
04-04 13:32:26.718: W/webview(9992): at android.webkit.JWebCoreJavaBridge.nativeServiceFuncPtrQueue(Native Method)
04-04 13:32:26.718: W/webview(9992): at android.webkit.JWebCoreJavaBridge.handleMessage(JWebCoreJavaBridge.java:113)
04-04 13:32:26.718: W/webview(9992): at android.os.Handler.dispatchMessage(Handler.java:99)
04-04 13:32:26.718: W/webview(9992): at android.os.Looper.loop(Looper.java:137)
04-04 13:32:26.718: W/webview(9992): at android.webkit.WebViewCore$WebCoreThread.run(WebViewCore.java:828)
04-04 13:32:26.718: W/webview(9992): at java.lang.Thread.run(Thread.java:856)
据我了解，WebView说我在WebView线程上调用WebView方法 - 而不是在UI线程上调用。我的问题是，除了WebView方法之外，我严格不触及onCreate() - 这种方法始终作为Activity lifecycle的一部分运行AFAIK总是在UI线程上......
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
WebView mWebView = new WebView(this);
mWebView.loadUrl("file:///android_asset/index.htm");
mWebView.getSettings().setJavaScriptEnabled(true);
mWebView.addJavascriptInterface(new CoreModInterface(), "Android");
mWebView.setWebViewClient(new WebViewClient());
setContentView(mWebView);
}
此警告在Nexus设备上不会发生。这是Samsung Tab 8.9的问题吗？
修改
删除这两行会删除错误。在显式runOnUiThread（）内的相同位置添加这两行也会产生相同的错误。在这个阶段，我再次相信三星再犯了一个错误。
mWebView.getSettings().setJavaScriptEnabled(true);
mWebView.addJavascriptInterface(new CoreModInterface(), "Android");