WebView methods on same thread error

Question

I have a android program (Java + html in a webview). I can call from the javascript to the Java code. But the other way around stopped working (after updating in eclipse).

Answer 1

The JavaScript method is executed on a background (i.e. non-UI) thread. You need to call all Android View related methods on the UI thread. You can achieve what you need with:

mWebView.post(new Runnable() {
    @Override
    public void run() {
        mWebView.loadUrl(...).
    }
});

Which will post the task to run on the UI thread.

Answer 2

This can be come over by using the post method. Please go through below code.

 m_targetView.post(new Runnable() {
                        @Override
                        public void run() {
                            m_targetView.loadUrl(".....");
                        }
                    });

Answer 3

Java version: You must to use Runnable interface and Post to Handler.

webView.post(new Runnable() {
          @Override
          public void run() {
             webView.loadUrl("file:///android_asset/www/index.html");
          }
       });

Kotlin version:

webView.post(new Runnable {
   webView.loadUrl("file:///android_asset/www/index.html")
})

Answer 4

In my case nothing was shown in a WebView, so I prefer another way:

runOnUiThread(new Runnable() {
    @Override
    public void run() {
        final WebView webView = (WebView) findViewById(R.id.map);
        webView.loadDataWithBaseURL(...);
    }
});