WebView web;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

web=(WebView) findViewById(R.id.web);

web.getSettings().setDefaultTextEncodingName("UTF-8") ;

web.getSettings().setJavaScriptEnabled(true);

web.getSettings().setAllowFileAccess(true);

web.addJavascriptInterface(new JsOperator(MainActivity.this),"JsInteraction");

web.loadData("

test", "text/html", "UTF-8");

//shareMsg("active ttt","ttttttt","test http://www.qq.com/ 测试","/assets/1.jpg");

}

package com.wgscd.gwang.myapplication;

/**

• Created by gwang on 2017/3/14.
  */

import android.app.AlertDialog;

import android.app.AlertDialog.Builder;

import android.content.Context;

import android.content.DialogInterface;

import android.content.DialogInterface.OnClickListener;

import android.webkit.JavascriptInterface;

import org.json.JSONObject;

public class JsOperator {

private Context context;public JsOperator(Context context) {    this.context = context;}/** * 弹出消息对话框 */@JavascriptInterfacepublic void showDialog(String message) {    AlertDialog.Builder builder = new Builder(context);    builder.setMessage(message);    builder.setTitle("提示");    builder.setPositiveButton("确认", new OnClickListener() {        @Override        public void onClick(DialogInterface dialog, int which) {        }    });    builder.setNegativeButton("取消", new OnClickListener() {        @Override        public void onClick(DialogInterface dialog, int which) {            dialog.dismiss();        }    });    builder.create().show();}/** * 获取登录的用户名和密码 * @return JSON格式的字符串 */@JavascriptInterfacepublic String getLoginInfo(){    try{        JSONObject login = new JSONObject();        login.put("Username", "YLD");        login.put("Password", "111");        return login.toString();    }catch(Exception e){        e.printStackTrace();    }    return null;}

}