同一线程错误上的 WebView 方法 - WebView methods on same thread error

问题：

I have a android program (Java + html in a webview).我有一个 android 程序（webview 中的 Java + html）。 I can call from the javascript to the Java code.我可以从 javascript 调用 Java 代码。 But the other way around stopped working (after updating in eclipse).但相反的方式停止工作（在 eclipse 中更新后）。

So this is what I'm trying to do所以这就是我想要做的

• Make a webview (worked)制作一个网页视图（工作）
• calling in javascript to AndroidFunction.test();在 javascript 中调用 AndroidFunction.test(); (worked) （工作）
• the java test() function call webView.loadUrl("javascript:helloBack()"); java test() 函数调用 webView.loadUrl("javascript:helloBack()"); (! not working anymore) （！不再工作了）

I tried to let it work with the WebView in the MainActivity, but it didnt work.我试图让它与 MainActivity 中的 WebView 一起工作，但它没有工作。

MainActivity.java主活动.java

public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        final WebView webView = (WebView)findViewById(R.id.webView);
        webView.getSettings().setJavaScriptEnabled(true);
        webView.setWebChromeClient(new WebChromeClient());
        WebSettings webSettings = webView.getSettings();
        webSettings.setJavaScriptEnabled(true);

        javascr = new Javascript(this, webView);
        webView.addJavascriptInterface(javascr, "AndroidFunction");
        webView.loadUrl("file:///android_asset/www/index.html");

        ....
}

Javascript.java Javascript.java

public class Javascript {   
    Context cont;
    WebView webView;

    Javascript(Context c, WebView w) {
        cont = c;
        webView = w;
    }

    // function called in the javascript by AndroidFunction.test();
    public void test() {
          // Breaking point!!!
        webView.loadUrl("javascript:helloBack()");
    }

Error:错误：

03-24 11:47:50.103: W/WebView(21026):   at com.android.org.chromium.base.SystemMessageHandler.handleMessage(SystemMessageHandler.java:27)
03-24 11:47:50.103: W/WebView(21026):   java.lang.Throwable: A WebView method was called on thread 'JavaBridge'. All WebView methods must be called on the same thread. (Expected Looper Looper{41ab68f8} called on Looper{41bb70a8}, FYI main Looper is Looper{41ab68f8})

03-24 11:47:50.103: W/WebView(21026):   at android.webkit.WebView.checkThread(WebView.java:2063)
03-24 11:47:50.103: W/WebView(21026):   at android.webkit.WebView.loadUrl(WebView.java:794)
03-24 11:47:50.103: W/WebView(21026):   at com.example.hellobt.Javascript.test(Javascript.java:24)

03-24 11:47:50.103: W/WebView(21026):   at com.android.org.chromium.base.SystemMessageHandler.nativeDoRunLoopOnce(Native Method)
03-24 11:47:50.103: W/WebView(21026):   at com.android.org.chromium.base.SystemMessageHandler.handleMessage(SystemMessageHandler.java:27)
03-24 11:47:50.103: W/WebView(21026):   at android.os.Handler.dispatchMessage(Handler.java:102)

03-24 11:47:50.103: W/WebView(21026):   at android.os.Looper.loop(Looper.java:137)
03-24 11:47:50.103: W/WebView(21026):   at android.os.HandlerThread.run(HandlerThread.java:61)

Thanks for the answer.谢谢你的回答。 I edited the function in my Javascript file like this:我在我的 Javascript 文件中编辑了这个函数，如下所示：

private void test(final String s) {
        webView.post(new Runnable() {
            public void run() {
                webView.loadUrl("javascript:" + s + ";");
            }
        });
        System.out.println("javscript done..");
    }

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解决方案：

参考： https://stackoom.com/en/question/1WrHd