android webview 加载内容,android 怎么实现启动页提前加载webView里的内容

//开启启动页，布局加个WebView，并设置本应用加载WebView。加载完后,下面是Fragment加载的WebView

package com.example.dongdong_frist_app.fragment;

import java.io.IOException;

import org.apache.http.HttpResponse;

import org.apache.http.client.ClientProtocolException;

import org.apache.http.client.HttpClient;

import org.apache.http.client.methods.HttpGet;

import org.apache.http.impl.client.DefaultHttpClient;

import org.apache.http.util.EntityUtils;

import android.annotation.SuppressLint;

import android.os.Bundle;

import android.support.v4.app.Fragment;

import android.support.v4.app.FragmentManager;

import android.util.Log;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.webkit.JavascriptInterface;

import android.webkit.JsResult;

import android.webkit.WebChromeClient;

import android.webkit.WebSettings;

import android.webkit.WebView;

import android.widget.Toast;

import com.example.dongdong_frist_app.R;

import com.example.dongdong_frist_app.dao.BuildDataDao;

@SuppressLint("ShowToast") public class Login_Fragment extends Fragment {

private View view;

private WebView wv;

@Override

public View onCreateView(LayoutInflater inflater, ViewGroup container,

Bundle savedInstanceState) {

// TODO Auto-generated method stub

view = inflater.inflate(R.layout.login_page, null);

new Thread(){

public void run() {

init();

};

}.start();

return view;

}

public void init(){

wv = (WebView)view.findViewById(R.id.wv);

wv.loadUrl("http://169.254.238.190:8081/Dongdong_Test2/html5-step-by-step-reg-form/login.html");

//获得WebSetting,设置js有效

WebSettings setting = wv.getSettings();

setting.setJavaScriptEnabled(true);

//把WebViewHelper的对象，传递到js中，供调用

wv.addJavascriptInterface(new WebViewHelper(), "wvHelper");

wv.setWebChromeClient(new WebChromeClient(){

@Override

public boolean onJsAlert(WebView view, String url, String message,

JsResult result) {

// TODO Auto-generated method stub

return super.onJsAlert(view, url, message, result);

}

});

}

//webview的帮助类

class WebViewHelper{

//让webview加载注册界面

BuildDataDao  dao = new BuildDataDao(getActivity());

@JavascriptInterface

public void goToRegist(){

wv.loadUrl("http://169.254.238.190:8081/Dongdong_Test2/html5-step-by-step-reg-form/index.html");

}

@JavascriptInterface

public void sendData(String name,String pass){

Log.i("aaa", "sendData=="+name+pass);

Toast.makeText(getActivity(), "====="+name+""+pass, 0).show();

//将用户注册信息保存到服务器

String url = "http://169.254.238.190:8081/Dongdong_Test2/AddMessage?username="+name+"&password="+pass+"";

String index = httpUtiles(url);

if(index.equals("true")){

Toast.makeText(getActivity(), "您已经注册成功", 0).show();

//跳转到登陆界面

wv.loadUrl("http://169.254.238.190:8081/Dongdong_Test2/html5-step-by-step-reg-form/login.html");

}else if(index.equals("false")){

Toast.makeText(getActivity(), "您的输入有误，请重新输入", 0).show();

wv.loadUrl("http://169.254.238.190:8081/Dongdong_Test2/html5-step-by-step-reg-form/index.html");

}

}

@JavascriptInterface

public void sendUserMSG(String name,String pass){

Log.i("aaa", "sendUserMSG=="+name+pass);

//将用户信息提交到服务器进行校验

String url = "http://169.254.238.190:8081/Dongdong_Test2/IsCheckedServlet?username="+name+"&password="+pass+"";

String index = httpUtiles(url);

if(index.equals("true")){

Toast.makeText(getActivity(), "登录成功", 1).show();

wv.destroy();

//获取Fragment的管理器登陆到主页面

FragmentManager fm = getActivity().getSupportFragmentManager();

HomePagerFragmnet homepagerfragment = new HomePagerFragmnet();

fm.beginTransaction().replace(R.id.wv, homepagerfragment).commit();

}else if(index.equals("false")){

Toast.makeText(getActivity(), "您的输入有误，请重新输入", 0).show();

wv.loadUrl("http://169.254.238.190:8081/Dongdong_Test2/html5-step-by-step-reg-form/login.html");

}

}

}

public String httpUtiles(String url) {

String str = null;

try {

HttpClient httpclient = new DefaultHttpClient();

HttpResponse response = httpclient.execute(new HttpGet(url));

if(response.getStatusLine().getStatusCode() == 200){

str = EntityUtils.toString(response.getEntity(), "utf-8");

Log.i("aaa", ""+str);

return str;

}

} catch  (IOException e) {

e.printStackTrace();

}

return null;

}

}