id cannot be resolved or is not a field解决思路

import android.app.Activity;import android.os.Bundle;import android.os.Handler;import android.webkit.WebView;import android.webkit.WebSettings;public class test extends Activity{    private WebView mWebView;    private Handler mHandler = new Handler();        /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        mWebView = (WebView) findViewById(R.id.webview);        WebSettings webSettings = mWebView.getSettings();        webSettings.setJavaScriptEnabled(true);        mWebView.addJavascriptInterface(new Object(){            public void screenSize() {                mHandler.post(new Runnable(){                    public void run(){                        mWebView.loadUrl("javascript:test()");                    }                });            }        }, "demo");                super.setIntegerProperty("splashscreen", R.drawable.ic_launcher);        super.setIntegerProperty("splashscreen", R.drawable.bg);        super.loadUrl("file:///android_asset/www/index.html",4000);    }}