WebView的使用

1.基本使用

       webView.setWebViewClient(new WebViewClient(){
            @Override
            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                //返回true时在webview中打开，false在浏览器中打开
                view.loadUrl(url);
                return true;
            }
        });
    web.setWebChromeClient(new WebChromeClient(){
            @Override
            public void onProgressChanged(WebView view, int newProgress) {
              //进度监听
                LogUtil.e(TAG, "onProgressChanged: progress -> " + newProgress );
            }

        });
        WebSettings webSettings =webView .getSettings();
        //允许显示js
        webSettings.setJavaScriptEnabled(true);
    

2.与js进行互相调用

    //可能需要允许js显示
    webView.addJavascriptInterface(this, "demo");

  @JavascriptInterface
    public void clickOnAndroid(String param) {
        //这里写给js调用后执行方法体
        // <button onClick="window.demo.clickOnAndroid('come from js')">点击调用Native代码并传递参数</button>
    }

交互的native方法是执行在子线程的，如果有ui更新操作，需要切换到UI线程

3.重写返回键

  public boolean onKeyDown(int keyCode, KeyEvent event) {
        if ((keyCode == KeyEvent.KEYCODE_BACK) && webView.canGoBack()) {
            webView.goBack();
            return true;
        }
        return super.onKeyDown(keyCode, event);
    }

4.添加Cookie

synCookies(this, url, getCookieValue());

    /**
     * 同步cookie
     *
     * @param context
     * @param url
     */
    public static void synCookies(Context context, String url, List<Cookie> cookies) {
        CookieSyncManager.createInstance(context);
        CookieManager cookieManager = CookieManager.getInstance();
        cookieManager.removeSessionCookie();
        cookieManager.removeAllCookie();
        cookieManager.setAcceptCookie(true);
        StringBuilder sb = null;
        for (Cookie cookie : cookies) {
            sb = new StringBuilder();
            sb.append(String.format(cookie.name() + "=%s", cookie.value()));
            sb.append(String.format(";domain=%s", cookie.domain()));
            sb.append(String.format(";path=%s", cookie.path()));
            sb.append(String.format(";expiresAt=%s", cookie.expiresAt()));
            cookieManager.setCookie(url, sb.toString());
        }
        CookieSyncManager.getInstance().sync();
        String cookie = cookieManager.getCookie(url);
        Log.e(TAG, "synCookies: cookie:" + cookie);
    }

   /**
     * 获得cookie信息(okhttp为例)
     *
     * @return
     */
    private List<Cookie> getCookieValue() {
        List<Cookie> allCookie = OkHttpUtils.getInstance().getCookieJar().getCookieStore().getAllCookie();
        /*Cookie cookie = allCookie.get(1);
        Log.e(TAG, "getCookieValue: name:" + cookie.name() + "    value:" + cookie.value() +
                "     hashcode:" + cookie.hashCode() +
                "    hostOnly:" + cookie.hostOnly() +
                "    secure:" + cookie.secure() +
                "   persistent:" + cookie.persistent());*/
        return allCookie;
    }

5.加载进度条

 webView.setWebChromeClient(new WebChromeClient() {
            @Override
            public void onProgressChanged(WebView view, int newProgress) {
                if (newProgress == 100) {
                    pbLoading.setVisibility(View.INVISIBLE);
                } else {
                    if (View.INVISIBLE == pbLoading.getVisibility()) {
                        pbLoading.setVisibility(View.VISIBLE);
                    }
                    pbLoading.setProgress(newProgress);
                }
                super.onProgressChanged(view, newProgress);
            }
        });