Android onBackPressed Problem

Question

Ich erstellte eine grundlegende Webview-App Anweisungen aus dem Web folgen. alles funktioniert gut, mit Ausnahme der Backpress-Taste, wenn Webview mit Server-Backpress auf Home-Bildschirm verbunden, aber wenn ich die Home-in-Menü-Elemente (Suche und überpage) klickte die App geschlossen. Hier ist mein Code

MainActivity.java

package com.dijitalyayincim.cekmekoy.cekmekoy_web; 
import android.app.ActionBar; 
import android.app.Activity; 
import android.app.ProgressDialog; 
import android.content.Intent; 
import android.graphics.Bitmap; 
import android.net.Uri; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.view.Menu; 
import android.view.MenuInflater; 
import android.view.MenuItem; 
import android.view.View; 
import android.webkit.WebSettings; 
import android.webkit.WebView; 
import android.webkit.WebViewClient; 
import android.widget.ProgressBar; 

public class MainActivity extends AppCompatActivity { 
    private WebView webView; 
    private boolean isRedirected; 



    private ProgressBar progress; 

    String url = "file:///android_asset/www/index.html"; 
    String url1 ="http://www.cekmekoy.info/index.php?option=com_sppagebuilder&view=page&id=12"; 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 

     setContentView(R.layout.activity_main); 
     //setContentView(R.layout.aa); 



     webView = (WebView) findViewById(R.id.webView); 
     startWebView(webView, url); 

    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 

     switch (item.getItemId()) { 
      case android.R.id.home: 
       finish(); 
       return true; 

      case R.id.action_info: 
       Element adsElement = new Element(); 
       adsElement.setTitle("Advertise with us"); 

       View aboutPage = new AboutPage(this) 
         .isRTL(false) 
         .setImage(R.drawable.logo_cekmekoy) 
         .addItem(new Element().setTitle("Version 1.0")) 
         .addItem(adsElement) 
         .addGroup("Bize Ulaşın") 
         .addEmail("info@cekmekoy.info") 
         .addWebsite("http://www.cekmekoy.info/") 
         .addFacebook("cekmekoyinfo") 
         .addTwitter("cekmekoyinfo") 
         .addYoutube("UCYt3Z595jctz5oUhg0SMLqQ") 
         .addInstagram("cekmekoy_info") 
         .create(); 

         setContentView(aboutPage); 
       setTitle("Bize Ulaşın"); 
         return true; 


      case R.id.action_search: 

       setContentView(R.layout.test); 
       webView = (WebView) findViewById(R.id.search); 
       startWebView(webView, url1); 
       setTitle("Arama"); 



      default: 
       // If we got here, the user's action was not recognized. 
       // Invoke the superclass to handle it. 
       return super.onOptionsItemSelected(item); 

     } 
    } 
    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     MenuInflater inflater = getMenuInflater(); 
     inflater.inflate(R.menu.menu, menu); 
     return true; 
    } 
    private void startWebView(WebView webView,String url) { 

     webView.setWebViewClient(new WebViewClient() { 
      ProgressDialog progressDialog; 


      public boolean shouldOverrideUrlLoading(WebView view, String url) { 
       if (url.startsWith("tel:")) { 
        Intent intent = new Intent(Intent.ACTION_DIAL, Uri.parse(url)); 
        startActivity(intent); 
        view.reload(); 
        return true; 
       } 
       view.loadUrl(url); 
       isRedirected = true; 
       return false; 
      } 

      @Override 
      public void onPageStarted(WebView view, String url, Bitmap favicon) { 
       super.onPageStarted(view, url, favicon); 
       isRedirected = false; 
      } 

      public void onLoadResource (WebView view, String url) { 
       if (!isRedirected) { 
        if (progressDialog == null) { 
         progressDialog = new ProgressDialog(MainActivity.this); 
         progressDialog.setMessage("Yükleniyor..."); 
         progressDialog.show(); 
        } 
       } 

      } 
      public void onPageFinished(WebView view, String url) { 
       MainActivity.this.setTitle(view.getTitle()); 
       try{ 
        isRedirected=true; 

        if (progressDialog.isShowing()) { 
         progressDialog.dismiss(); 
         progressDialog = null; 
        } 



       }catch(Exception exception){ 
        exception.printStackTrace(); 
       } 
      } 

     }); 

     webView.getSettings().setJavaScriptEnabled(true); 
     webView.loadUrl(url); 
    } 


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

i wirklich zu schätzen, wenn Sie

dank helfen ...

Answer 1

@Override 
public boolean onKeyDown(int keyCode, KeyEvent event) { 
    if (event.getAction() == KeyEvent.ACTION_DOWN) { 
     switch (keyCode) { 
      case KeyEvent.KEYCODE_BACK: 
       if (mWebView.canGoBack()) { 
        mWebView.goBack(); 
       } else { 
        finish(); 
       } 
       return true; 
     } 

    } 
    return super.onKeyDown(keyCode, event); 
} 

Verwenden Sie diesen Code. Hoffnung hilft dir.

Answer 2

Kommentar diese Ziellinie.und verwenden Sie Ihre Methode. webView.goBack();

@Override 
public boolean onOptionsItemSelected(MenuItem item) { 

    switch (item.getItemId()) { 
     case android.R.id.home: 
//    finish(); 
      return true; 
} 
}