Android WebView 的使用

WebView 有两个非常重要的辅助类,WebViewClient和WebViewChromeCient,先介绍这两个类的用区别

WebViewClient主要帮助WebView处理各种通知、请求事件的.

• onLoadResource

• onPageStart

• onPageFinish

• onReceiveError

• onReceivedHttpAuthRequest

WebChromeClient主要辅助WebView处理Javascript的对话框、网站图标、网站title、加载进度.

• onCloseWindow
  关闭WebView

• onCreateWindow()

• onJsAlert
  WebView上alert无效，需要定制WebChromeClient处理弹出

• onJsPrompt

• onJsConfirm

• onProgressChanged

• onReceivedIcon

• onReceivedTitle

代码:

public class MainActivity extends AppCompatActivity {    private WebView mWvContent;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mWvContent = (WebView) findViewById(R.id.id_wv_content);        mWvContent.loadUrl("http://sina.com.cn"); // 访问网页        // 获取设置        WebSettings settings = mWvContent.getSettings();        // 设置支持JavaScript脚本        settings.setJavaScriptEnabled(true);        // 支持文件访问        settings.setAllowFileAccess(true);        // 支持缩放        settings.setBuiltInZoomControls(true);        settings.setSupportZoom(true);        // 帮助WebView处理各种通知和请求事件        mWvContent.setWebViewClient(new WebViewClient() {            // 是在浏览器中跳转还是在此WebView中跳转            @Override            public boolean shouldOverrideUrlLoading(WebView view, String url) {                view.loadUrl(url);                return true;            }            // 加载页面资源时调用            @Override            public void onPageStarted(WebView view, String url, Bitmap favicon) {                super.onPageStarted(view, url, favicon);                Toast.makeText(MainActivity.this, "onPageStarted: " + url, Toast.LENGTH_SHORT).show();            }        });        // 辅助WebView处理JS事件        mWvContent.setWebChromeClient(new WebChromeClient() {            // 设置网页进度条            @Override            public void onProgressChanged(WebView view, int newProgress) {                super.onProgressChanged(view, newProgress);            }            // 获取网页的标题            @Override            public void onReceivedTitle(WebView view, String title) {                super.onReceivedTitle(view, title);            }            // 获取JS弹窗时的信息            @Override            public boolean onJsAlert(WebView view, String url, String message, JsResult result) {                Toast.makeText(MainActivity.this, message, Toast.LENGTH_SHORT).show();                return true;            }            // 获取JS输入框的信息            @Override            public boolean onJsPrompt(WebView view, String url, String message, String defaultValue, JsPromptResult result) {                return super.onJsPrompt(view, url, message, defaultValue, result);            }            // 获取JS的确认框            @Override            public boolean onJsConfirm(WebView view, String url, String message, JsResult result) {                return super.onJsConfirm(view, url, message, result);            }        });    }}