一个完整webview的写法

webView的java文件代码：

public class SportMe_MyOrderWebView extends AbstractBaseActivity{
    private static final String TAG = "YunHuWebViewActivity";
    private String APP_CACAHE_DIRNAME = "/webcache";
    private String webUrl;
    private WebView webView;
    private LinearLayout loading_layout;
    private int index;

    @Override
    public void initIntentParam(Intent intent) {
        // TODO Auto-generated method stub
        title = getResources().getString(R.string.sports_myorder_me);
        if (intent != null) {
            webUrl = intent.getStringExtra("webUrl");
            index = intent.getIntExtra("index",0);
        }
    }

    @Override
    public void initView() {
        // TODO Auto-generated method stub
        showContentView(R.layout.tran_webview);
        mSportsApp = (SportsApp) getApplication();
        Log.d(TAG, "WebViewActivity inited");
        webView = (WebView) findViewById(R.id.web_train);
        loading_layout = (LinearLayout) findViewById(R.id.loading_layout);
        webView.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);
        loadWebView();
    }

    @Override
    public void setViewStatus() {
        // TODO Auto-generated method stub
    }

    @Override
    public void onPageResume() {
        MobclickAgent.onPageStart("Train_webViewClass");
    }

    @Override
    public void onPagePause() {
        MobclickAgent.onPageEnd("Train_webViewClass");
    }

    @Override
    public void onPageDestroy() {
        // TODO Auto-generated method stub
        clearWebViewCache();
        CookieSyncManager.createInstance(this);
        CookieManager cookieManager = CookieManager.getInstance();
        cookieManager.removeAllCookie();
        webView.removeAllViews();
        webView.destroy();
        webView = null;
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if ((keyCode == KeyEvent.KEYCODE_BACK) && webView.canGoBack()) {
            // 返回键退回
            webView.goBack();
            return true;
        }
        return super.onKeyDown(keyCode, event);
    }

    private void loadWebView() {
        WebSettings webSettings = webView.getSettings();
        webSettings.setJavaScriptEnabled(true);
        webSettings.setRenderPriority(WebSettings.RenderPriority.HIGH);
        webSettings.setCacheMode(WebSettings.LOAD_DEFAULT); // 设置 缓存模式
        // 开启 DOM storage API 功能
        webSettings.setDomStorageEnabled(true);
        // 开启 database storage API 功能
        webSettings.setDatabaseEnabled(true);
        String cacheDirPath = getFilesDir().getAbsolutePath()
                + APP_CACAHE_DIRNAME;
        Log.i(TAG, "cacheDirPath=" + cacheDirPath);
        // 设置数据库缓存路径
        webSettings.setDatabasePath(cacheDirPath);
        // 设置 Application Caches 缓存目录
        webSettings.setAppCachePath(cacheDirPath);
        // 开启 Application Caches 功能
        webSettings.setAppCacheEnabled(true);
        webSettings.setUserAgentString("mfox");
        webView.setWebViewClient(new WebViewClient() {

            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                view.loadUrl(url);
                return true;
            }

            @Override
            public void onPageFinished(WebView view, String url) {
                super.onPageFinished(view, url);
            }
        });
        webView.setWebChromeClient(new WebChromeClient() {
            public void onProgressChanged(WebView view, int progress) {
                if (progress == 100)
                    loading_layout.setVisibility(View.GONE);
            }
        });
        webView.loadUrl(webUrl);
    }

    /**
     * 清除WebView缓存
     */
    public void clearWebViewCache() {

        // 清理Webview缓存数据库
        try {
            deleteDatabase("webview.db");
            deleteDatabase("webviewCache.db");
        } catch (Exception e) {
            e.printStackTrace();
        }

        // WebView 缓存文件
        File appCacheDir = new File(getFilesDir().getAbsolutePath()
                + APP_CACAHE_DIRNAME);
        Log.e(TAG, "appCacheDir path=" + appCacheDir.getAbsolutePath());

        File webviewCacheDir = new File(getCacheDir().getAbsolutePath()
                + "/webviewCache");
        Log.e(TAG, "webviewCacheDir path=" + webviewCacheDir.getAbsolutePath());

        // 删除webview 缓存目录
        if (webviewCacheDir.exists()) {
            deleteFile(webviewCacheDir);
        }
        // 删除webview 缓存 缓存目录
        if (appCacheDir.exists()) {
            deleteFile(appCacheDir);
        }
    }

    /**
     * 递归删除 文件/文件夹
     */
    public void deleteFile(File file) {

        Log.i(TAG, "delete file path=" + file.getAbsolutePath());

        if (file.exists()) {
            if (file.isFile()) {
                file.delete();
            } else if (file.isDirectory()) {
                File files[] = file.listFiles();
                for (int i = 0; i < files.length; i++) {
                    deleteFile(files[i]);
                }
            }
            file.delete();
        } else {
            Log.e(TAG, "delete file no exists " + file.getAbsolutePath());
        }
    }
}

布局文件：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="@color/white"
    android:orientation="vertical" >
    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_above="@+id/mls_pay"
        >
        <WebView
            android:id="@+id/web_train"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent" >
        </WebView>

        <LinearLayout
            android:id="@+id/loading_layout"
            android:layout_width="wrap_content"
            android:layout_centerInParent="true"
            android:layout_height="wrap_content"
            android:orientation="horizontal" >
            <ProgressBar
                android:id="@+id/progressBarItemImageLoading"
                style="@android:style/Widget.ProgressBar.Small"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="center_vertical"
                android:layout_marginRight="6dp"
                android:indeterminateDrawable="@anim/record_loading"
                android:maxHeight="24dip"
                android:maxWidth="24dip"
                android:minHeight="24dip"
                android:minWidth="24dip" />
            <TextView
                android:id="@+id/ItemText"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="center_vertical"
                android:layout_marginLeft="5dp"
                android:singleLine="true"
                android:text="@string/loading"
                android:textColor="@android:color/black"
                android:textSize="16sp" />
        </LinearLayout>
    </RelativeLayout>
</RelativeLayout>