Webview後退按鈕不會返回（退出應用程序）

我試圖將webview後退按鈕實現到我的應用程序中，因此當用戶單擊後退按鈕時，webview會將其返回到previos頁面。但是當我按回按鈕它退出應用程序？這是網頁視圖代碼：Webview後退按鈕不會返回（退出應用程序）

import android.annotation.SuppressLint; 
import android.os.Bundle; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.webkit.WebChromeClient; 
import android.webkit.WebSettings; 
import android.webkit.WebView; 
import android.webkit.WebViewClient; 
import android.widget.ProgressBar; 
import android.widget.Toast; 

import com.actionbarsherlock.app.SherlockFragment; 
import com.actionbarsherlock.app.SherlockFragmentActivity; 
import com.emirnp.next.press.R; 

@SuppressLint("SetJavaScriptEnabled") 
public class VestiActivity extends SherlockFragmentActivity { 

    private static WebView webview; 
    private static ProgressBar bar; 
    private static String url; 

    public static class WebviewFragment extends SherlockFragment { 

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

     @Override 
     public View onCreateView(LayoutInflater inflater, ViewGroup container, 
       Bundle savedInstanceState) { 
      try { 
       View v = inflater.inflate(R.layout.activity_webview, container, 
         false); 
       webview = (WebView) v.findViewById(R.id.webView1); 
       webview.setWebChromeClient(new MyWebChromeClient()); 
       bar = (ProgressBar) v.findViewById(R.id.load); 

       url = "http://www.server.se/test/" 
         + getResources().getString(R.string.vesti_id); 
       loadUrl(); 
       return v; 
      } catch (Exception e) { 
       e.printStackTrace(); 
      } 

      return null; 
     } 

     private void loadUrl() { 

      WebSettings webSettings = webview.getSettings(); 
      webSettings.setJavaScriptEnabled(true); 
      webSettings.setDomStorageEnabled(true); 

      final SherlockFragmentActivity activity = getSherlockActivity(); 
      webview.setWebChromeClient(new WebChromeClient() { 
       @Override 
       public void onProgressChanged(WebView view, int progress) { 
        if (progress == 100) { 
         bar.setVisibility(View.GONE); 
         webview.setVisibility(View.VISIBLE); 
        } 

       } 

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

      }); 

      webview.loadUrl(VestiActivity.url); 
     } 
    } 

    @Override 
    public void onBackPressed() { 
     if (webview.canGoBack()) 
      webview.goBack(); 
     else 
      super.onBackPressed(); 
    } 
}

WebviewActivity：

import android.os.Bundle; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.webkit.WebChromeClient; 
import android.webkit.WebSettings; 
import android.webkit.WebView; 
import android.webkit.WebViewClient; 
import android.widget.ProgressBar; 
import android.widget.Toast; 

import com.actionbarsherlock.app.SherlockFragment; 
import com.actionbarsherlock.app.SherlockFragmentActivity; 
import com.emirnp.next.press.R; 

public class WebviewActivity extends SherlockFragmentActivity { 

    private static WebView webview; 
    private static ProgressBar bar; 
    private static String url = null; 

    protected static void setUrl(String url) { 
     WebviewActivity.url = url; 
    } 

    public static class WebviewFragment extends SherlockFragment { 

     @Override 
     public void onActivityCreated(Bundle savedInstanceState) { 
      super.onActivityCreated(savedInstanceState); 
      // getSherlockActivity().requestWindowFeature(Window.FEATURE_PROGRESS); 
      // getSherlockActivity().getSupportActionBar().setDisplayHomeAsUpEnabled(true); 
     } 

     @Override 
     public View onCreateView(LayoutInflater inflater, ViewGroup container, 
       Bundle savedInstanceState) { 
      try { 
       View v = inflater.inflate(R.layout.activity_webview, container, 
         false); 
       webview = (WebView) v.findViewById(R.id.webView1); 
       bar = (ProgressBar) v.findViewById(R.id.load); 

       loadUrl(); 
       return v; 
      } catch (Exception e) { 
       e.printStackTrace(); 
      } 
      return null; 
     } 

     public void loadUrl() { 

      WebSettings webSettings = webview.getSettings(); 
      webSettings.setJavaScriptEnabled(true); 
      webSettings.setDomStorageEnabled(true); 

      final SherlockFragmentActivity activity = getSherlockActivity(); 
      webview.setWebChromeClient(new WebChromeClient() { 
       @Override 
       public void onProgressChanged(WebView view, int progress) { 
        /* 
        * activity.setSupportProgress((Window.PROGRESS_END - 
        * Window.PROGRESS_START)/100 * progress); 
        */ 
        if (progress == 100) { 
         bar.setVisibility(View.GONE); 
         webview.setVisibility(View.VISIBLE); 
        } 

       } 

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

      webview.loadUrl(url); 
     } 
    } 

    @Override 
    public void onBackPressed() { 
     if (webview.canGoBack()) 
      webview.goBack(); 
     else 
      super.onBackPressed(); 
    } 

}

activity_webview.xml：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    tools:context=".AboutActivity" > 

    <WebView 
     android:id="@+id/webView1" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentTop="true"   
     android:visibility="gone" /> 

    <ProgressBar 
     android:id="@+id/load" 
     style="?android:attr/progressBarStyleLarge" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_centerHorizontal="true" 
     android:layout_centerVertical="true" 
     android:visibility="visible" /> 

</RelativeLayout>

來源

2014-04-19 Emirnop

另請參閱此[相關問題]（http://stackoverflow.com/questions/5448653/how-to-implement-onbackpressed-in-android-fragments） – donfuxx

我們可以看到activity_webview.xml文件嗎？ –

@ neeraj2608 我已添加webviewactivity和activity_webview – Emirnop

設置onBackPressed，但webView的你必須這樣做：

`webView.setOnKeyListener(new OnKeyListener() 
      { 
       @Override 
       public boolean onKey(View v, int keyCode, KeyEvent event) 
       { 
        if(keyCode == KeyEvent.KEYCODE_BACK && webView.canGoBack()) 
        { 
         webView.goBack(); 
         return true; 
        }else if(keyCode == KeyEvent.KEYCODE_FORWARD && webView.canGoForward()){ 
         webView.goForward(); 
         return true; 
        } 

        return false; 
       } 
      });`

親切的問候！

來源

2014-07-08 19:04:17 user3111328

Webview後退按鈕不會返回（退出應用程序）

回答

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