Android WebView的使用

WebView初始化设置

//设置javaScript
webView.getSettings().setJavaScriptEnabled(true);
webView.getSettings().setRenderPriority(WebSettings.RenderPriority.HIGH);
webView.getSettings().setCacheMode(WebSettings.LOAD_DEFAULT);  //设置 缓存模式
// 开启 DOM storage API 功能
webView.getSettings().setDomStorageEnabled(true);
//开启 database storage API 功能
webView.getSettings().setDatabaseEnabled(true);

设置缓存路径

String cacheDirPath = getFilesDir().getAbsolutePath() + APP_CACAHE_DIRNAME;
//设置数据库缓存路径
webView.getSettings().setDatabasePath(cacheDirPath);
//设置  Application Caches 缓存目录
webView.getSettings().setAppCachePath(cacheDirPath);
//开启 Application Caches 功能
webView.getSettings().setAppCacheEnabled(true);

设置UserAgent

webView.getSettings().setUserAgentString();

WebView加载url

webView.setWebViewClient(new WebViewClient() {
            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                //每次加载url前都同步cookie
                synCookies(url);
                //加载url
                view.loadUrl(url);
                return true;
            }

            @Override
            public void onPageStarted(WebView view, String url, Bitmap favicon) {
                //这里可以展示加载界面
                showLoading();
                super.onPageStarted(view, url, favicon);
            }

            @Override
            public void onPageFinished(WebView view, String url) {
                cookies = cookieManager.getCookie(url);
                //隐藏加载界面
                hideLoading();
                super.onPageFinished(view, url);
            }

            @Override
            public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
                
                super.onReceivedError(view, errorCode, description, failingUrl);
            }

            @Override
            public void onFormResubmission(WebView view, Message dontResend, Message resend) {
                resend.sendToTarget();
            }
        });

WebView加载首页url

//同步首页url的cookie
synCookies(url);
//加载首页url
webView.loadUrl(url);

同步cookie

private void synCookies(String url) {
    String cookie = cookieManager.getCookie(url);
    //保存最新cookie到本地。
    if (cookie != null ) {
        getSP().edit().putString(SP_COOKIE, cookie).commit();
    }
    //将本地cookie设置到该url中
    if (getSP().getString(WebAcitivity.SP_COOKIE, null) != null) {
        String cookies = getSP().getString(WebAcitivity.SP_COOKIE, null);
        String[] cook = cookies.split(";");
        for (int i = 0; i < cook.length; i++) {
            cookieManager.setCookie(url, cook[i]);
        }
    }
}

WebView与JS交互

webView.setWebChromeClient(new WebChromeClient() {
            @Override
            public boolean onJsConfirm(WebView view, String url, String message, JsResult result) {
                return super.onJsConfirm(view, url, message, result);
            }

            @Override
            public boolean onJsAlert(WebView view, String url, String message, JsResult result) {
                return super.onJsAlert(view, url, message, result);
            }

            @Override
            public boolean onJsPrompt(WebView view, String url, String message, String defaultValue, JsPromptResult result) {
                //TODO 这里收到message和defaultValue
                //注意：这里的回调在子线程中，需要使用handler在主线程中实现业务逻辑
                
                
                result.cancel();
                return true;
            }
        });