【Android基础】Android WebView参数设置详解

1.WebView一般需要访问网络，需要在 AndroidManifest.xml里面添加权限

 

2.BackHandleFragment请参照【android进阶】Fragment内放置WebView，监听返回键，并返回之前打开的网页

 

 

public class WorkFragment extends BackHandledFragment {

    private WebView webView;
    private WebSettings webSettings;

    private static final String APP_CACAHE_DIRNAME = "/webcache";
    private String url = "https://www.baidu.com/";
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        View view = inflater.inflate(R.layout.work_fragment,container,false);
        webView = (WebView)view.findViewById(R.id.workWebView);

        webSettings = webView.getSettings();
        webSettings.setJavaScriptEnabled(true); //支持JavaScript参数
        webSettings.setUseWideViewPort(true);
        webSettings.setLoadWithOverviewMode(true);
        webSettings.setSupportZoom(true);  //支持放大缩小
        webSettings.setBuiltInZoomControls(true); //显示缩放按钮


        String cacheDirPath = getActivity().getFilesDir().getAbsolutePath()+APP_CACAHE_DIRNAME; //缓存路径

        webSettings.setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);  //缓存模式
        webSettings.setAppCachePath(cacheDirPath); //设置缓存路径
        webSettings.setAppCacheEnabled(true); //开启缓存功能

        webView.setWebViewClient(new MyWebViewClient()); //WebView从自己的浏览器里打开网页
        webView.loadUrl(url);  //加载URL

        return view;
    }

    private class MyWebViewClient extends WebViewClient {
        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            
            view.loadUrl(url);
            return true;
        }

        @Override
        public void onReceivedError(WebView view, int errorCode,
                                    String description, String failingUrl) {
            Toast.makeText(this,"网页加载错误！",0).show();
        }
    }
    @Override
    public  boolean onBackPressed(){

        if(webView.canGoBack()){
            webView.goBack();
            Log.v("webView.goBack()", "webView.goBack()");
            return true;

        }else{
            Log.v("Conversatio退出","Conversatio退出");
            return false;
        }

    }

}