java和js交互1

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java和js交互

安卓端的代码：

public class MainActivity extends Activity {    private WebView wb;    private ProgressBar pb;    private EditText uname;    private EditText pwd;    private Dialog dialog;    private SharedPreferences sp;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        sp = getSharedPreferences("login", 0);        boolean b = sp.getBoolean("isrem", false);        if (b == true) {            System.out.println("aaa");            Intent intent = new Intent(MainActivity.this, Main2Activity.class);            startActivity(intent);            return;        }        init();        initWebView();        wb.addJavascriptInterface(new Object() {            //在Android4.0以后版本需要添加            @JavascriptInterface            public void yz(String name, String pwd) {                Intent intent = new Intent(MainActivity.this,                        Main2Activity.class);                startActivity(intent);                SharedPreferences sp = getSharedPreferences("login", 0);                Editor edit = sp.edit();                edit.putBoolean("isrem", true);                edit.putString("name", name);                edit.putString("pwd", pwd);                edit.commit();            }            @JavascriptInterface            public void user(String ts) {                tc(ts);            }            @JavascriptInterface            public void pwd(String pwd) {                tc(pwd);            }        }, "javacode");        //加载assets下的文件        wb.loadUrl("file:///android_asset/form.html");    }    // 初始化控件    private void init() {        wb = (WebView) findViewById(R.id.wb);        pb = (ProgressBar) findViewById(R.id.pb);        //设置网页不跳到其他位置        wb.setWebViewClient(new WebViewClient());        wb.setWebChromeClient(new WebChromeClient() {             @Override            public void onProgressChanged(WebView view, int newProgress) {                // 显示进度条                pb.setVisibility(View.VISIBLE);                pb.setProgress(newProgress);                //当进度条等于100是 进度条消失                if (pb.getProgress() == newProgress) {                    pb.setVisibility(View.GONE);                }                super.onProgressChanged(view, newProgress);            }        });    }    //初始化webview    private void initWebView() {        WebSettings set = wb.getSettings();        // 设置支持javascript        set.setJavaScriptEnabled(true);    }    public void tc(String msg) {        AlertDialog.Builder builder = new AlertDialog.Builder(this);        builder.setTitle("我是警示框");        builder.setMessage(msg);        builder.show();    }}

html代码

<!doctype html><html><head><meta charset="utf-8"><title>无标题文档</title><script language="javascript">function test(){   if(document.login.uname.value==""){    //alert("用户名不能为空!");         window.javacode.user("用户名不能为空");   }else if(document.login.upass.value==""){    //alert("密码不能为空!");      window.javacode.pwd("密码不能为空不能为空");    }else{    //alert("成功登录跳转Activity!");     window.javacode.yz(document.login.uname.value,document.login.upass.value);    }    }</script></head><body><form  action="" name="login">姓名： <input type="text" name="uname"/> <br/>密码： <input type="password" name="upass"  /> <br/><input type="button" onClick="test()" value="登录"/></form></form> </body></html>

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