Come caricare una pagina web esterna all'interno di WebView

Il mio problema è che la pagina web non viene caricata nella visualizzazione web.

mWebview.loadUrl("http://www.google.com"); avvia il browser web ...

Questo è il codice della mia attività:

import android.app.Activity;
import android.os.Bundle;
import android.webkit.WebView;

public class Main extends Activity {

    private WebView mWebview;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        mWebview = new WebView(this);
        mWebview.loadUrl("http://www.google.com");
        setContentView(mWebview);
    }   
}

Ho aggiunto l'autorizzazione richiesta nel Manifest:

<uses-permission android:name="android.permission.INTERNET" />

Grazie a questo post ho finalmente trovato la soluzione. Ecco il codice:

import android.app.Activity;
import android.os.Bundle;
import android.webkit.WebResourceError;
import android.webkit.WebResourceRequest;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Toast;
import android.annotation.TargetApi;

public class Main extends Activity {

    private WebView mWebview ;

    @Override
    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        mWebview  = new WebView(this);

        mWebview.getSettings().setJavaScriptEnabled(true); // enable javascript

        final Activity activity = this;

        mWebview.setWebViewClient(new WebViewClient() {
            @SuppressWarnings("deprecation")
            @Override
            public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
                Toast.makeText(activity, description, Toast.LENGTH_SHORT).show();
            }
            @TargetApi(android.os.Build.VERSION_CODES.M)
            @Override
            public void onReceivedError(WebView view, WebResourceRequest req, WebResourceError rerr) {
                // Redirect to deprecated method, so you can use it in all SDK versions
                onReceivedError(view, rerr.getErrorCode(), rerr.getDescription().toString(), req.getUrl().toString());
            }
        });

        mWebview .loadUrl("http://www.google.com");
        setContentView(mWebview );

    }

}

prova questo

webviewlayout.xml:

<?xml version="1.0" encoding="utf-8"?>
<WebView xmlns:android="http://schemas.android.com/apk/res/android"
         android:id="@+id/help_webview"
         android:layout_width="fill_parent"
         android:layout_height="fill_parent"
         android:scrollbars="none"
/>

Nella tua attività:

WebView webView;
setContentView(R.layout.webviewlayout);
webView = (WebView)findViewById(R.id.help_webview);
webView.getSettings().setJavaScriptEnabled(true);
webview.loadUrl("http://www.google.com");

Aggiornare

Aggiungi webView.setWebViewClient(new WebViewController());alla tua attività.

Classe WebViewController:

public class WebViewController extends WebViewClient {

    @Override
    public boolean shouldOverrideUrlLoading(WebView view, String url) {
        view.loadUrl(url);
        return true;
    }
}

public class WebViewController extends WebViewClient {
    @Override
    public boolean shouldOverrideUrlLoading(WebView view, String url) {
        view.loadUrl(url);
        return true;
    }
}
webView.setWebViewClient(new WebViewController());

Si prega di utilizzare questo codice: -

main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="fill_parent"
    android:layout_height="fill_parent" android:background="@drawable/background">
    <RelativeLayout android:layout_width="fill_parent"
        android:layout_height="wrap_content" android:background="@drawable/top_heading"
        android:id="@+id/rlayout1">
        <TextView android:layout_width="wrap_content"
            android:layout_centerVertical="true" android:layout_centerHorizontal="true"
            android:textColor="#ffffff" android:textSize="22dip"
            android:textStyle="bold" android:layout_height="wrap_content"
            android:text="More Information" android:id="@+id/txtviewfbdisplaytitle" />
    </RelativeLayout>
    <RelativeLayout android:layout_width="fill_parent"
        android:layout_height="fill_parent" android:layout_below="@+id/rlayout1"
        android:id="@+id/rlayout2">
        <WebView android:id="@+id/webview1" android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:layout_weight="1.0" />
    </RelativeLayout>
</RelativeLayout>

MainActivity.Java

public class MainActivity extends Activity {
    private class MyWebViewClient extends WebViewClient {
          @Override
          public boolean shouldOverrideUrlLoading(WebView view, String url) {
              view.loadUrl(url);
              return true;
          }
    }
    Button btnBack;
    WebView webview;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        webview=(WebView)findViewById(R.id.webview1);
        webview.setWebViewClient(new MyWebViewClient());
        openURL();
    }

     /** Opens the URL in a browser */
    private void openURL() {
        webview.loadUrl("http://www.google.com");
        webview.requestFocus();
    }
}

Prova questo codice se qualsiasi domanda me lo chiede.

È molto semplice provare a integrare queste righe di codice prima di prendere l'autorizzazione nel file manifest di Android

<uses-permission android:name="android.permission.INTERNET" />

quindi scrivi del codice in Activity.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.MainActivity">

<WebView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/help_webview"
    android:layout_width="match_parent"
    android:layout_height="match_parent"

/>

</LinearLayout>

Quindi scrivi questo codice nel tuo MainActivity.java

import android.app.Activity;
import android.content.Intent;
import android.content.res.Resources;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.Window;
import android.webkit.WebResourceRequest;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Toast;

public class MainActivity extends Activity{
    private WebView mWebview ;
    String link = "";// global variable
    Resources res;// global variable
    @Override


      protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            requestWindowFeature(Window.FEATURE_NO_TITLE);
            setContentView(R.layout.activity_modernherbal_main);
            mWebview  = (WebView) findViewById(R.id.help_webview);
            WebSettings webSettings = mWebview.getSettings();
            webSettings.setJavaScriptEnabled(true);
            webSettings.setUseWideViewPort(true);
            webSettings.setLoadWithOverviewMode(true);



        final Activity activity = this;

        mWebview.setWebViewClient(new WebViewClient() {
            public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
                Toast.makeText(activity, description, Toast.LENGTH_SHORT).show();
            }


});

    mWebview .loadUrl("http://www.example.com");

}

}

Prova questo ti aiuterà a risolvere il tuo problema

basta andare nel file XML e dare l'ID al tuo webView, quindi in java incollare queste righe:

   public class Main extends Activity {

private WebView mWebview;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.Your_layout_file_name);

    mWebview = (WebView)findViewById(R.id.id_you_gave _to_your_wenview_in_xml);
    mWebview.loadUrl("http://www.google.com");
    }   
}

Puoi fare così.

webView = (WebView) findViewById(R.id.webView1);
webView.getSettings().setJavaScriptEnabled(true);
webView.loadUrl("Your URL goes here");

prova questo;

webView.loadData("<iframe src='http://www.google.com' style='border: 0; width: 100%; height: 100%'></iframe>", "text/html; charset=utf-8", "UTF-8");

Aggiungi l'autorizzazione Internet in AndroidManifest.xml

<uses-permission android:name="android.permission.INTERNET" />

Nel tuo layout:

<?xml version="1.0" encoding="utf-8"?>
<WebView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/webView"
 />

Nella tua attività

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    try {
        progressDialog = new ProgressDialog(this);
        url_Api = "https://docs.microsoft.com/en-us/learn";

        webView = this.findViewById(R.id.webView);

            progressDialog.setMessage(getString(R.string.connection_Wait));
            progressDialog.setIndeterminate(false);
            progressDialog.setCancelable(true);
            progressDialog.show();

            LoadUrlWebView( url_Api );
    }catch (Exception e){
        Log.w(TAG, "onCreate", e);
    }
}

private void LoadUrlWebView( String url_api ) {
    try {
        webView.setWebViewClient(new WebViewClient());
        webView.setWebChromeClient(new MyWebChromeClient( url_api ));
        webView.getSettings().setJavaScriptEnabled(true);
        webView.getSettings().setSupportZoom(true);
        webView.getSettings().setAllowContentAccess(true);
        webView.getSettings().setBuiltInZoomControls(true);
        webView.getSettings().setDisplayZoomControls(false);

        webView.loadUrl(url_api);
    } catch (Exception e) {
        Log.w(TAG, "setUpNavigationView", e);
    }
}

private class MyWebChromeClient extends WebChromeClient {
    private String urlAccount;

    public MyWebChromeClient( String urlAccount ) {
        this.urlAccount = urlAccount;
    }

    @Override
    public void onProgressChanged(WebView view, int newProgress) {
        try {
            //Tools.LogCat(context, "INSIDE MyWebChromeClient | onProgressChanged / newProgress1:" + newProgress);
            progressDialog.setMessage(newProgress + "% " + getString(R.string.connection_Wait));
            if (newProgress < 100 && !progressDialog.isShowing()) {
                if (progressDialog != null)
                    progressDialog.show();
            }
            if (newProgress == 100) {
                if (progressDialog != null)
                    progressDialog.dismiss();
            }
        }catch (Exception e){
            Log.w( "onProgressChanged", e);
        }
    }

    @Override
    public void onReceivedTitle(WebView view, String title) {
        super.onReceivedTitle(view, title);

        sharedPreferences = new Shared_Preferences( context );
        sharedPreferences.setPageWebView(view.getUrl());
    }

}

Ho usato questo codice che era fantastico. ma ho un errore. "neterr_cleartext_not_permitted" mostra quando usi questo codice, allora dovrai affrontare questo problema ..

Ho una soluzione per questo. Devi aggiungerlo nel tuo AndroidManifest.xml vicino all'applicazione

android:usesCleartextTraffic="true"
<uses-permission android:name="android.permission.INTERNET" /> // ignore if you already added. outside of Application.

Aggiungi client WebView

mWebView.setWebViewClient(new WebViewClient());

È necessario aggiungere il client WebView

mWebView.setWebViewClient(new WebViewClient() {

   public void onPageFinished(WebView view, String url) {
        // do your stuff here
    }
});

inoltre è possibile utilizzare onPageFinished per eseguire l'attività dopo che la visualizzazione sul Web ha completato il caricamento della pagina Web

Aggiungi sotto il metodo nella tua classe di attività.Qui il browser non è altro che il tuo oggetto webview.

Ora puoi visualizzare facilmente le pagine web che contengono.

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