android - 如何一个接一个地连续加载URL

Question

我想一个一个地加载 URL。我使用 String 数组来存储 URL。我的要求是，如果 webview 加载第一个 url，它应该在页面启动和页面结束时打印消息“page started”应该显示“页面完成”。第一个 url 加载完成后，它应该加载第二个 URL 并继续相同的过程。

我写的代码如下:

package com.browser;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.util.Log;
import android.webkit.WebView;
import android.webkit.WebViewClient;

public class browser extends Activity {

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        final String[] url={"http://www.yahoo.com","http://www.google.com","http://www.ibnlive.com"};
        final MyWebView mwv = new MyWebView(this); 
        mwv.setWebViewClient(new myweb()); 
        new Thread(new Runnable(){
            public void run(){
                Log.d("runThread","runthread");
                for(int i=0;i<2;i++){
                    openbrowser(url[i]);
                }

            }

            private void openbrowser(String url) {

                mwv.getSettings().setJavaScriptEnabled(true); 
                mwv.loadUrl(url);   
                Log.d("",""+url);
                setContentView(mwv);
            }
        }).start();
    }


    public class MyWebView extends WebView{

        public MyWebView(Context context) {
            super(context);

        }
    }
    public class myweb extends WebViewClient{
        @Override       
        public boolean shouldOverrideUrlLoading(WebView view, String url) { 
            System.out.println("LOADING");

            return false;
        }
        @Override
        public void onPageStarted(WebView view, String url, Bitmap favicon) {

            System.out.println("PageStarted: " + url);
        }

        @Override   
        public void onPageFinished(WebView view, String url){
            System.out.println("PageFinished: " + url);
        }
    }


    }
    ///indented code <--remove this

它只加载最后一个 URL。

Answer 1

您可以使用以下代码在 webview 中逐个加载 url。此代码只是将您只能看到或看不到所有网址但您可以看到最后一个的网址一个一个地加载。

public class WebViewsScreenActivity extends Activity {

    private WebView mwebview;
    int i =0;
    private WebViewsScreenActivity _activity;
    ProgressDialog _dilog;
    private String[] Urls = {"http://www.google.com","http://www.gmail.com","http://www.yahoo.com"}; 

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);  
         getWindow().requestFeature(Window.FEATURE_PROGRESS);  
        mwebview = new WebView(this);
        setContentView(mwebview);
        _activity = this;  
        mwebview.getSettings().setJavaScriptEnabled(true);
        mwebview.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);

        if(checkInternetConnection(_activity)){
            if(savedInstanceState==null)    
                mwebview.loadUrl(Urls[i]);
            else
                mwebview.restoreState(savedInstanceState);
        }
        else{
            //showAlert  "Unable to Connect Server"
        }
         mwebview.setWebChromeClient(new WebChromeClient() {

                @Override
       public void onProgressChanged(WebView view, int progress) {
                 if(mwebview.getVisibility()==View.VISIBLE)
                 {
                 WebViewsScreenActivity.this.setProgress(progress * 100);

                 }
                }
              });
        mwebview.setWebViewClient(new HelloWebViewClient());
    }

    @Override
    public boolean onKeyUp(int keyCode, KeyEvent event) {
        // TODO Auto-generated method stub
        if(keyCode == KeyEvent.KEYCODE_BACK)
        {
            mwebview.goBack();
            return true;
        }
        else
            return super.onKeyUp(keyCode, event);
    }


    //To check whether network connection is available on device or not
    private boolean checkInternetConnection(Activity _activity) {
        ConnectivityManager conMgr = (ConnectivityManager) _activity.getSystemService(Context.CONNECTIVITY_SERVICE);
        if (conMgr.getActiveNetworkInfo() != null
                && conMgr.getActiveNetworkInfo().isAvailable()
                && conMgr.getActiveNetworkInfo().isConnected())
            return true;
        else
            return false;
    }//checkInternetConnection()



    //HelloWebViewClient class for webview
    private class HelloWebViewClient extends WebViewClient {

        @Override
        public void onPageStarted(WebView view, String url, Bitmap favicon) {
            // TODO Auto-generated method stub
            super.onPageStarted(view, url, favicon);
                    Toast.makeText(getApplicationContext(), "Loading started...!"+Urls[i], Toast.LENGTH_SHORT).show();

        }
        @Override
        public void onReceivedError(WebView view, int errorCode,
                String description, String failingUrl) {
            // TODO Auto-generated method stub
            super.onReceivedError(view, errorCode, description, failingUrl);

        }
        @Override
        public void onPageFinished(WebView view, String url) {
            // TODO Auto-generated method stub
            super.onPageFinished(view, url);
                    Toast.makeText(getApplicationContext(), "Loading done...!"+Urls[i], Toast.LENGTH_SHORT).show();
            i++;
            if(i<Urls.length)
                view.loadUrl(Urls[i]);
        }
    } //HelloWebViewClient-class
}//AccountsScreenActivity-class

在 manifeast 文件中添加如下权限:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.vl.agarwal"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="8" />
    <uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name=".WebViewsScreenActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>