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Editorial Team
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Asked: 2026-05-26T05:39:21+00:00

Simple code: public class ZSEEActivity extends TabActivity { private WebView webview ; private WebView

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Simple code: 

public class ZSEEActivity extends TabActivity {
private WebView webview ; 
private WebView webviewtwo;
private TabHost mTabHost;
private int a;


protected void onStart() {
    super.onStart();
    // The activity is about to become visible.
}
protected void onStop() {
    super.onStop();
    // The activity is about to become visible.
}
protected void onRestart() {
    super.onRestart();
}
protected void onDestroy(){
    super.onDestroy();
}
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    final Activity activity = this;


    mTabHost = getTabHost();

    mTabHost.addTab(mTabHost.newTabSpec("tab_test1").setIndicator("Zastępstwa").setContent(R.id.tab1));
    mTabHost.addTab(mTabHost.newTabSpec("tab_test2").setIndicator("Plan Lekcji").setContent(R.id.tab2));
    mTabHost.addTab(mTabHost.newTabSpec("tab_test3").setIndicator("O programie").setContent(R.id.tab3));



    webview = (WebView) findViewById(R.id.webView1);
    webviewtwo = (WebView) findViewById(R.id.webView2);
    final WebSettings webviewtwoSettings = webviewtwo.getSettings();
        if (savedInstanceState != null){
            webview.restoreState(savedInstanceState.getBundle("stateone"));
            webviewtwo.restoreState(savedInstanceState.getBundle("statetwo"));
            webviewtwoSettings.setTextSize(TextSize.LARGER);
            mTabHost.setCurrentTab(savedInstanceState.getInt("CURRENT_TAB"));

        }
        else{
            webview.loadUrl("http://zsee.bytom.pl/ogloszenia.php");
            webviewtwo.loadUrl("http://zsee.bytom.pl/plannew/index.html");
            webviewtwoSettings.setTextSize(TextSize.LARGER);
            mTabHost.setCurrentTab(0);
        }


    webview.setWebViewClient(new WebViewClient() {
           public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
               String summary = "<html><body><meta http-equiv=\"Content-Type\" content=\"text/html;charset=utf-8\" ><center>Coś się zepsuło :(</center></body></html>";
               webview.loadData(summary, "text/html","utf-8");
             Toast.makeText(activity, "O nie! " + description, Toast.LENGTH_SHORT).show();
           }
         });

    webviewtwo.setWebViewClient(new WebViewClient() {
       public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
           String summary = "<html><body><meta http-equiv=\"Content-Type\" content=\"text/html;charset=utf-8\" ><center>Coś się zepsuło :(</center></body></html>";
           webviewtwo.loadData(summary, "text/html","utf-8");
           webviewtwoSettings.setTextSize(TextSize.NORMAL);
         Toast.makeText(activity, "O nie! " + description, Toast.LENGTH_SHORT).show();
       }
     });

    }
public boolean onCreateOptionsMenu(Menu menu) {
    MenuInflater inflater = getMenuInflater();
    inflater.inflate(R.menu.main, menu);
    return true;
}

protected void onSaveInstanceState(Bundle outState) {
    Bundle outStateone = new Bundle();
    Bundle outStatetwo = new Bundle();
    webview.saveState(outStateone);
    webviewtwo.saveState(outStatetwo);


    outState.putBundle("stateone", outStateone);
    outState.putBundle("statetwo", outStatetwo);
    outState.putInt("CURRENT_TAB", mTabHost.getCurrentTab());
}



public boolean onOptionsItemSelected(MenuItem item) {
    // Handle item selection
    switch (item.getItemId()) {
    case R.id.item1:
        final AlertDialog alertdialog= new AlertDialog.Builder(this).create();
        alertdialog.setTitle("O Programie");
        alertdialog.setMessage("Zmiany w 1.0.1: \n-Obsługa planu z dnia 17.10.2011\n-Drobne Poprawki");
        alertdialog.setButton("Fajno", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int id) {
                alertdialog.cancel();
           }
       });
        alertdialog.show();
        return true;
    case R.id.item2:
        finish();
    case R.id.item3:
        if(mTabHost.getCurrentTab() == 0){
        webview.loadUrl("http://zsee.bytom.pl/ogloszenia.php");
        }
        else if(mTabHost.getCurrentTab() == 1)
        {
        webviewtwo.loadUrl("http://zsee.bytom.pl/plannew/index.html");
        }
    default:
        return super.onOptionsItemSelected(item);
    }
}
}

Now My problem. After i press back button onStop() code is executed and onDestroy. How i can don’t kill app ? I wanna this app in background. Now when i press back button and open app, all data is again downloaded and loaded to webview. Soo how make this process work in background ?

Sorry for my haotic english 🙂

Sierran

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1 Answer

  1. Editorial Team

    Use Android service for doing something in Background rather then Activity.

    And use Broadcast receiver to invoke your Activity from service. When something your background work finished.

    Android – Service

    And if you want to do some little then just override onKeyDown()

    @Override     
 public boolean onKeyDown(int keyCode, KeyEvent event) 
  {         
    if (keyCode == KeyEvent.KEYCODE_BACK) 
       {            
     // put your stuff here or just block the back button for perticular activity             
           return true;        
       }         
     return super.onKeyDown(keyCode, event); 
   }
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