java和js互调 webview

public class JavaAndJSActivity extends Activity implements View.OnClickListener {
    private EditText etNumber;
    private EditText etPassword;
    private Button btnLogin;
    /**
     * 加载网页或者说H5页面
     */
    private WebView webView;

    /**
     * Find the Views in the layout<br />
     * <br />
     * Auto-created on 2016-07-28 11:43:37 by Android Layout Finder
     * (http://www.buzzingandroid.com/tools/android-layout-finder)
     */
    private void findViews() {
        setContentView(R.layout.activity_java_and_js);
        etNumber = (EditText) findViewById(R.id.et_number);
        etPassword = (EditText) findViewById(R.id.et_password);
        btnLogin = (Button) findViewById(R.id.btn_login);
        btnLogin.setOnClickListener(this);

        initWebView();
    }

    /**
     * Handle button click events<br />
     * <br />
     * Auto-created on 2016-07-28 11:43:37 by Android Layout Finder
     * (http://www.buzzingandroid.com/tools/android-layout-finder)
     */
    @Override
    public void onClick(View v) {
        if (v == btnLogin) {
            // Handle clicks for btnLogin
            login();
        }
    }

    private void login() {
        String numebr = etNumber.getText().toString().trim();
        String password = etPassword.getText().toString().trim();
        if (TextUtils.isEmpty(numebr) || TextUtils.isEmpty(password)) {
            Toast.makeText(JavaAndJSActivity.this, "账号或者密码为空", Toast.LENGTH_SHORT).show();
        } else {
            //登录
            login(numebr);
        }
    }

    /**
     * Java调用javaScript
     *
     * @param numebr
     */
    private void login(String numebr) {
        webView.loadUrl("javascript:javaCallJs(" + "'" + numebr + "'" + ")");
        setContentView(webView);
    }

    private void initWebView() {
        webView = new WebView(this);
        WebSettings webSettings = webView.getSettings();
        //设置支持javaScript脚步语言
        webSettings.setJavaScriptEnabled(true);

        //支持双击-前提是页面要支持才显示
//        webSettings.setUseWideViewPort(true);

        //支持缩放按钮-前提是页面要支持才显示
        webSettings.setBuiltInZoomControls(true);

        //设置客户端-不跳转到默认浏览器中
        webView.setWebViewClient(new WebViewClient());

        //设置支持js调用java
        webView.addJavascriptInterface(new AndroidAndJSInterface(),"Android");

        //加载网络资源
//        webView.loadUrl("http://10.0.2.2:8080/assets/JavaAndJavaScriptCall.html");　　　　　　//加载assets文件夹下的资源
        webView.loadUrl("file:///android_asset/JavaAndJavaScriptCall.html");

        //显示页面
//        setContentView(webView);
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        findViews();
    }

    /**
     * js可以调用该类的方法
     */
    class AndroidAndJSInterface{
        @JavascriptInterface
        public void showToast(){
            Toast.makeText(JavaAndJSActivity.this, "我被js调用了", Toast.LENGTH_SHORT).show();
        }
    }
}

JavaAndJavaScriptCall.html

<html>
<head>
    <meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
    <script type="text/javascript">

    function javaCallJs(){
         document.getElementById("content").innerHTML +=
             "<br\>java调用了js无参函数";
    }

    function javaCallJs(arg){
         document.getElementById("content").innerHTML =
             ("欢迎："+arg );
    }

   function showDialog(){
      alert("你好,我是来自javascript");
   }

    </script>

</head>

<body>

<div align="left" id="content"> 555</div>
<div align="right">光临</div>

<p><img src="http://atguigu.com/images/logo.gif"></p>

<input type="button" value="点击Android被调用" onclick="window.Android.showToast()" />

</body>

</html>

巴特西

java和js互调 webview

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