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How to download URLs one by one

I want to download the url one by one. I used a String array to store the url. My requirement is that if the webview loads the first URL, it should print msg "page started" when the page starts and when the page closes it should show "page completed". After the download of the first URL is complete, it should download the second URL and continue the same process.

The encoding I wrote is as follows:

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

It only downloads the latest URL.

+5
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6 answers

Try this one ...

int position=0;

textview.setText("page started");
browser.loadUrl("your first url");
browser.setWebChromeClient(new WebChromeClient()
{
    public void onProgressChanged(WebView view, int progress) 
    {
       if(progress == 100)
       {
          textview.setText("page finished");
          if(position==0)
          {
            browser.loadUrl("your second url");
            position=1;
            textview.setText("page started");
          } 
          if(position==1)
          {
            browser.loadUrl("your third url");
            position=2;
            textview.setText("page started");
          } 
       }
    }
});

You can also display Toast instead of TextView.

+8

URL- -. URL- , URL-, .

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

, :

<?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>
+5

:

package com.mywebslider;


import android.app.Activity;
import android.os.Bundle;
import android.os.CountDownTimer;
import android.view.KeyEvent;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.TextView;
import android.widget.Toast;

public class WebSliderActivity extends Activity {

    TextView number;
    WebView mWebView;
    CountDownTimer mTimer;

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


        number = (TextView) findViewById(R.id.number);
        mTimer=new CountDownTimer(15000, 1000) {

         String[] myArray={"http://www.upc.nl/","http://www.google.com","http://www.quickspot.nl"}; 


            int currentIndex=0; 
            public void onTick(long millisUntilFinished) {

                number.setText("seconds remaining: " + millisUntilFinished / 1000);
            }
             //code comment start
             // i think this part could be written better
             // but it works!!!
            public void onFinish() {
                if (currentIndex<myArray.length) {
                    number.setText("done!");
                    mWebView.loadUrl(myArray[currentIndex]);
                    currentIndex++;
                } else {
                    currentIndex=0;
                    if (currentIndex<myArray.length)
                    number.setText("done!");
                    mWebView.loadUrl(myArray[currentIndex]);
                    currentIndex++;
                    mTimer.start();
                }

                    mTimer.start();

            }
            //code comment end
         };

        mTimer.start();
        mWebView = (WebView) findViewById(R.id.webview);
        mWebView.getSettings().setJavaScriptEnabled(true);
        mWebView.loadUrl("http://stackoverflow.com");
        mWebView.setWebViewClient(new WebSliderWebViewClient(){
        @Override  
        public void onPageFinished(WebView view, String url) {
            super.onPageFinished(mWebView, url);
            Toast.makeText(getApplicationContext(), "Done!", Toast.LENGTH_SHORT).show();

        }  

        @Override
        public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
           Toast.makeText(getApplicationContext(), "Oh no! " + description, Toast.LENGTH_SHORT).show();

        }
    });


    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if ((keyCode == KeyEvent.KEYCODE_BACK) && mWebView.canGoBack()) {
            mWebView.goBack();
            return true;
        }
        return super.onKeyDown(keyCode, event);
    }

    private class WebSliderWebViewClient extends WebViewClient {
        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            view.loadUrl(url);
            return true;
        }
    }
}

, , . main.xml :

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <WebView 
    android:id="@+id/webview"
    android:layout_width="fill_parent"
    android:layout_height="0dp" 
    android:layout_weight="1"
    />

<TextView  
   android:id="@+id/number" 
   android:layout_width="fill_parent"
   android:layout_height="0dp" 
   android:layout_weight="1"
    />

</LinearLayout>

50/50. WebView, TextView.

+3

, , onPageStarted() onPageFinished -. URL- , .

for(), onPagefinished() .

+2
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Try encoding the WebViewClient extension to notify your activity when the download is complete. I tried changing your code to do just that:

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 {

private MyWebView mwv = null;
private MyWeb myweb = null;
private List<String> urls = null;
private String[] url = new String[] {"http://www.yahoo.com","http://www.google.com","http://www.ibnlive.com"};

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

    mwv = new MyWebView(this);
    myweb = new MyWeb(this);
    mwv.setWebViewClient(myweb); 
    urls = Arrays.asList(url);
    loadNextUrl(null);
}

private loadNextUrl(String fromUrl) {
    if (fromUrl == null) {
        myweb.setOriginalUrl(urls.get(0));
        mwv.loadUrl(urls.get(0));
    } else {
        if (urls.indexOf(fromUrl) == urls.size() - 1) return;
        String newUrl = urls.get(urls.indexOf(fromUrl) + 1);
        myweb.setOriginalUrl(newUrl);
        mwv.loadUrl(newUrl);
    }
}


public class MyWebView extends WebView{

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

    }
}
public class MyWeb extends WebViewClient{
    Browser activity = null;

    // Prevent redirects from messing with URL array
    String originalUrl = null;

    public MyWeb(Browser activity) {
        this.activity = activity;
    }

    public setOriginalUrl(String url) {
        this.originalUrl = url;
    }

    @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);
        activity.loadNextUrl(originalUrl);
    }
}


}
+2
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You can use the queue to store URLs that need to be loaded one by one.

Queue<String> mQueue = new LinkedList<String>();
...

@Override
public void onCreate(Bundle savedInstanceState) {
    ...
    mQueue.add("http://url1");
    mQueue.add("http://url2");
    mQueue.add("http://urln");
    ...
    String url = mQueue.remove();
    mwv.loadurl(url);
}
...
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);
        String url = null;
        url = mQueue.remove();
        if (url != null) {
            view.loadUrl(url);
        }
    }
}
+1
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