标签：android web webview javascript 交互
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<WebView
android:id="@+id/webView"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
表示添加供JS调用的对象，其别名是JsInteraction，这样在JS中只要写JsInteraction.<方法名称>()就可以调用相应的方法了。WebView将加载assets文件夹里LoginJs文件夹下的login.html，这个文件会在后面创建。package com.yld.jsinteraction;
import android.support.v7.app.ActionBarActivity;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.annotation.SuppressLint;
import android.os.Bundle;
public class MainActivity extends ActionBarActivity {
private WebView webView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
this.webView = (WebView) this.findViewById(R.id.webView);
this.initializeWebView();
}
@SuppressLint({ "NewApi", "SetJavaScriptEnabled" })
private void initializeWebView(){
webView.addJavascriptInterface(new JsOperator(MainActivity.this),
"JsInteraction");
try {
String url = "file:///android_asset/LoginJs/login.html";
WebSettings webSettings = webView.getSettings();
webSettings.setJavaScriptEnabled(true);
webSettings.setAllowFileAccess(true);
webSettings.setAllowFileAccessFromFileURLs(true);
this.webView.loadUrl(url);
} catch (Exception e) {
e.printStackTrace();
}
}
}
package com.yld.jsinteraction;
import org.json.JSONObject;
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;
public class JsOperator {
private Context context;
public JsOperator(Context context) {
this.context = context;
}
/**
* 弹出消息对话框
*/
@JavascriptInterface
public 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
*/
@JavascriptInterface
public 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;
}
}
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title id="title">Login</title> <script type="text/javascript" src="login.js"></script> </head> <body style="background:lightblue"> <div style="margin-top: 20px;margin-left: 20px"> <div> <label>Username:</label> <input id="txtUsername" type="text" style="margin-left: 20px"/> </div> <div style="margin-top: 20px"> <label>Password:</label> <input id="txtPassword" type="text" style="margin-left: 20px"/> </div> <div style="margin-top: 20px;margin-left: 160px"> <button onclick="loginObj.login()" style="width:100px">Login</button> </div> </div> </body> </html>
var Login = (function(){
function Login(){
}
Login.prototype.login = function(){
JsInteraction.showDialog("Login start...");
}
Login.prototype.setLoginInfo = function(){
var logininfoJson = JsInteraction.getLoginInfo();
//解析json字符串
var logininfo = eval("("+logininfoJson+")");
document.getElementById("txtUsername").value = logininfo.Username;
document.getElementById("txtPassword").value = logininfo.Password;
}
return Login;
})();
var loginObj = new Login();
window.onload=function(){
loginObj.setLoginInfo();
}
版权声明：本文为博主原创文章，转载时须注明本文的详细链接，否则作者将保留追究其法律责任。
Android WebView与JavaScript交互实现Web App
标签：android web webview javascript 交互
原文地址：http://blog.csdn.net/leyyang/article/details/47444271
