Android Webview获取网页标题和文本内容

来源：互联网发布：全球电视台直播软件编辑：程序博客网时间：2024/05/22 14:35

通过自定义webview实现类似IOS webview中的stringByEvaluatingJavaScriptFromString方法获取js中的文本简介，代码如下：

public class MyWebView extends WebView {    public MyWebView(Context context) {        super(context);    }    public MyWebView(Context context, AttributeSet attrs) {        super(context, attrs);    }    public MyWebView(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);    }    public String stringByEvaluatingJavaScriptFromString(String script) {        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {            try {                Field mp = WebView.class.getDeclaredField("mProvider");                mp.setAccessible(true);                Object webViewObject = mp.get(this);                Field wc = webViewObject.getClass().getDeclaredField("mWebViewCore");                wc.setAccessible(true);                Object webViewCore = wc.get(webViewObject);                Field bf = webViewCore.getClass().getDeclaredField("mBrowserFrame");                bf.setAccessible(true);                Object browserFrame = bf.get(webViewCore);                Method stringByEvaluatingJavaScriptFromString = browserFrame.getClass()                        .getDeclaredMethod("stringByEvaluatingJavaScriptFromString",                                String.class);                stringByEvaluatingJavaScriptFromString.setAccessible(true);                Object obj_value = stringByEvaluatingJavaScriptFromString.invoke(                        browserFrame, script);                return String.valueOf(obj_value);            } catch (Exception e) {                Log.e("!!!", "stringByEvaluatingJavaScriptFromString", e);            }            return null;        } else {            try {                Field[] fields = WebView.class.getDeclaredFields();                // 由webview取到webviewcore                Field field_webviewcore = WebView.class.getDeclaredField("mWebViewCore");                field_webviewcore.setAccessible(true);                Object obj_webviewcore = field_webviewcore.get(this);                // 由webviewcore取到BrowserFrame                Field field_BrowserFrame = obj_webviewcore.getClass().getDeclaredField(                        "mBrowserFrame");                field_BrowserFrame.setAccessible(true);                Object obj_frame = field_BrowserFrame.get(obj_webviewcore);                // 获取BrowserFrame对象的stringByEvaluatingJavaScriptFromString方法                Method method_stringByEvaluatingJavaScriptFromString = obj_frame.getClass()                        .getMethod("stringByEvaluatingJavaScriptFromString", String.class);                // 执行stringByEvaluatingJavaScriptFromString方法                Object obj_value = method_stringByEvaluatingJavaScriptFromString.invoke(                        obj_frame,                        script);                // 返回执行结果                return String.valueOf(obj_value);            } catch (Exception e) {                Log.e("!!!", "stringByEvaluatingJavaScriptFromString", e);            }            return null;        }    }}

在网页中添加一段js，包含需要获取文本的字段，如果要兼容微信分享，则定义的变量需和公众号里的是一样的，如下：
这里写图片描述

使用示例：

public class CommonWebActivity extends BaseActivity {    private MyWebView mWebView;    private String mTitle = "";    private String url = "";    private String msgTitle;//分享标题    private String msgDesc;//分享描述    private String msgImgUrl;//分享图片    private String msgLink;//分享链接    private boolean canShare = false;//是否支持分享    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_common_webview);        init();    }    private void init() {        mWebView = (MyWebView) findViewById(R.id.webView);        WebSettings settings = mWebView.getSettings();        settings.setJavaScriptEnabled(true);        settings.setCacheMode(WebSettings.LOAD_NO_CACHE);        settings.setLoadWithOverviewMode(true);        settings.setUseWideViewPort(true);        settings.setJavaScriptCanOpenWindowsAutomatically(true);        mWebView.setScrollBarStyle(WebView.SCROLLBARS_OUTSIDE_OVERLAY);        mWebView.setHorizontalScrollBarEnabled(false);        mWebView.setHorizontalScrollbarOverlay(true);        mWebView.setWebViewClient(getViewClient());        mWebView.setWebChromeClient(getChromeClient());        initIntentData();        loadData();    }    private void initIntentData() {        Intent intent = getIntent();        if (null != intent) {            url = intent.getStringExtra("url");        }    }    private WebViewClient getViewClient() {        return new WebViewClient(){            @Override            public void onPageStarted(WebView view, String url, Bitmap favicon) {                super.onPageStarted(view, url, favicon);            }            @Override            public void onPageFinished(WebView view, String url) {                setRightTilteText("分享");                msgDesc = mWebView.stringByEvaluatingJavaScriptFromString("msg_desc");                msgTitle = mWebView.stringByEvaluatingJavaScriptFromString("msg_title");                msgLink = mWebView.stringByEvaluatingJavaScriptFromString("msg_link");                Log.d(TAG, msgTitle + "/" + msgDesc + "/" + msgLink);                super.onPageFinished(view, url);            }            @Override            public boolean shouldOverrideUrlLoading(WebView view, String url) {                return super.shouldOverrideUrlLoading(view, url);            }        };    }    private WebChromeClient getChromeClient() {        return new WebChromeClient(){            //获取网页标题的另一种方式            @Override            public void onReceivedTitle(WebView view, String title) {                super.onReceivedTitle(view, title);                mTitle = title;                setTitle(mTitle);            }        };    }    private void loadData() {        mWebView.loadUrl(url);    }    @Override    protected void onDestroy() {        if (null != mWebView) {            mWebView.destroy();        }        super.onDestroy();    }    @Override    protected void onRightTitleClick() {        //分享    }}

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