/**
 * Convenience method to set some generic defaults for a
 * given WebView
 *
 * @param webView
 */
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
private void setUpWebViewDefaults(WebView webView) {
    //开启硬件加速后，WebView渲染页面更加快速，拖动也更加顺滑。
    // 但有个副作用就是容易会出现页面加载白块同时界面闪烁现象。
    // 解决这个问题的方法是设置WebView暂时关闭硬件加速
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB && webView.isHardwareAccelerated()) {
        webView.setLayerType(View.LAYER_TYPE_SOFTWARE, null);
    }
    WebSettings settings = webView.getSettings();
    // 设置字符集编码
    settings.setDefaultTextEncodingName("UTF-8");
    //支持数据保存
    settings.setSavePassword(true);
    settings.setSaveFormData(true);
    //支持缩放
    settings.setSupportZoom(true);
    // Enable Javascript
    settings.setJavaScriptEnabled(true);
    // Use WideViewport and Zoom out if there is no viewport defined
    settings.setUseWideViewPort(true);
    settings.setLoadWithOverviewMode(true);
    settings.setLayoutAlgorithm(WebSettings.LayoutAlgorithm.SINGLE_COLUMN);//自适应屏幕
    // Enable pinch to zoom without the zoom buttons
    settings.setBuiltInZoomControls(true);
    if(Build.VERSION.SDK_INT > Build.VERSION_CODES.HONEYCOMB) {
        // Hide the zoom controls for HONEYCOMB+
        settings.setDisplayZoomControls(false);
    }
    // Enable remote debugging via chrome://inspect
    if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
        WebView.setWebContentsDebuggingEnabled(true);
    }
    //如果SDK版本大于19则使用缓存数据
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
        settings.setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);
    }
    //加载图片优化
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
        settings.setLoadsImagesAutomatically(true);//图片自动缩放 打开
    } else {
        settings.setLoadsImagesAutomatically(false);//图片自动缩放 关闭
    }
    //支持localStorage
    settings.setDomStorageEnabled(true);
    settings.setAppCacheMaxSize(1024*1024*8);
    String appCachePath = getApplicationContext().getCacheDir().getAbsolutePath();
    settings.setAppCachePath(appCachePath);
    settings.setAllowFileAccess(true);
    settings.setAppCacheEnabled(true);
}

@Override
protected void onDestroy() {
    mGroupLayout.removeAllViews();
    webView.stopLoading();
    webView.removeAllViews();
    webView.destroy();
    webView = null;
    mGroupLayout = null;
    super.onDestroy();
}