Cómo cargar URL consecutivamente uno por uno

Question

Quiero cargar la URL uno por uno. Utilicé una matriz de cadenas para almacenar la URL. Mi requisito es que si la vista web carga la primera url, debería imprimir el mensaje "página iniciada" cuando la página comienza y cuando la página finaliza debe mostrar "página terminada". Una vez que finaliza la primera carga de la url, debe cargar la segunda URL y continuar con el mismo proceso.

La codificación que he escrito es el siguiente:

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 

Se carga sólo la última URL.

Answer 1

El problema es que no espera que onPageStarted() y onPageFinished devuelvan algo. En cambio, tu código solo carga las URL una por una tan rápido que solo ves la última.

Necesita modificar su bucle for() para esperar que el método onPagefinished() regrese antes de cargar otra página.

Answer 2

Me trataron de simular y se le ocurrió la siguiente:

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; 
     } 
    } 
} 

Aparte del hecho de esto funciona, el circuito de matriz puede hacerse mejor. main.xml debe decir:

<?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> 

La salida hará una pantalla de 50/50. Uno es para WebView y la otra mitad muestra un contador en un TextView.

Answer 3

Puede usar el siguiente código para cargar urls uno por uno en la vista web. Este código solo carga las URL una por una que solo ves o no puedes ver todas las URL, pero puedes ver la última.

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 

agregar los permisos de archivo de la siguiente manera :: manifeast

<?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> 

Answer 4

Prueba con esto ...

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"); 
      } 
     } 
    } 
}); 

también puede visualizar la tostada lugar de TextView ..

Answer 5

Intenta codificar la extensión WebViewClient para notificar a tu Actividad cuando se complete la carga. He intentado modificar el código para hacer precisamente eso:

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); 
    } 
} 


} 

Answer 6

Se puede utilizar una cola para contener las direcciones URL que se va a cargar a uno tras otro.

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); 
     } 
    } 
}