How to implement a command that allows user to add and delete tabs in the application?

I am trying to make an app with tabs at the top that link a website too each one, such as a computer that uses tabs in safari or firefox. What I am trying to do is implement an add and delete class that will allow the user to delete a tab if wanted and add another that will link to a different website. Any help would be greatly appreciated.

Here is the main java file.

public class UniversityofColorado extends TabActivity {


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

    TabHost host=getTabHost();

    host.addTab(host.newTabSpec("one")
            .setIndicator("Google")
            .setContent(new Intent(this, Hello.class)));

    host.addTab(host.newTabSpec("two")
                    .setIndicator("Colorado Main Site")
                    .setContent(new Intent(this, ColoradoMainSiteBrowser.class)));

    host.addTab(host.newTabSpec("three")
                    .setIndicator("CULearn")
                    .setContent(new Intent(this, CULearnBrowser.class)));

    host.addTab(host.newTabSpec("four")
            .setIndicator("CULink")
            .setContent(new Intent(this, CULinkBrowser.class)));

    host.addTab(host.newTabSpec("five")
            .setIndicator("MyCUInfo")
            .setContent(new Intent(this, MyCUInfoBrowser.class)));

    host.addTab(host.newTabSpec("six")
            .setIndicator("Campus Map")
            .setContent(new Intent(this, CampusBrowser.class)));

    host.addTab(host.newTabSpec("Seven")
            .setIndicator("Notes")
            .setContent(new Intent(this, Notepadv3.class)));
}   




    // Inflates menu when "menu Key" 开发者_开发百科is pressed
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.menu, menu);
        return true;
    }
}

This is one of the java files that the main java file uses:

public class ColoradoMainSiteBrowser extends Activity {

WebView webview;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
webview = (WebView) findViewById(R.id.webview);
webview.setWebViewClient(new HelloWebViewClient());
webview.getSettings().setJavaScriptEnabled(true);
webview.loadUrl("http://colorado.edu/");
}
private class HelloWebViewClient extends WebViewClient {
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url)
{
view.loadUrl(url);
return true;
}
}
public boolean onKeyDown(int keyCode, KeyEvent event) {
if ((keyCode == KeyEvent.KEYCODE_BACK) && webview.canGoBack()) {
webview.goBack();
return true;
}
return super.onKeyDown(keyCode, event);
}
}

How would I implement the add and delete buttons to have this same format when the new tabs were added.

In order to achieve the desired effect, you probably need to drop an activity for each tab approach.

Instead, you would create a "default" view that you can use to all websites that accept the URL as a parameter.

Then, instead of "intenting" a new activity to each tab, you Inflate that view to the new tab, passing the URL as a parameter.

To create and delete tabs dinamically would be easy. A simple button that Inflates/removes the view would sufice.

XML

res/layout/main.xml

<TabHost xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@android:id/tabhost"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <LinearLayout
        android:orientation="vertical"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:padding="5dp">
        <TabWidget
            android:id="@android:id/tabs"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content" />
        <FrameLayout
            android:id="@android:id/tabcontent"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:padding="5dp" />
    </LinearLayout>    
</TabHost>

res/layout/tab.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
>
<TextView
android:id="@+id/url_tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="HELLO TAB!"
>
</TextView>
</LinearLayout>

res/menu/menu.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item android:enabled="true" android:visible="true" android:icon="@android:drawable/ic_menu_add" android:title="Add Website" android:titleCondensed="add" android:id="@+id/add"></item>
<item android:titleCondensed="Delete" android:enabled="true" android:visible="true" android:icon="@android:drawable/ic_menu_delete" android:id="@+id/delete" android:title="Delete Website"></item>
</menu>

JAVA CODE

main.java

import android.app.TabActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.TabHost;
import android.widget.TextView;


public class Main extends TabActivity implements TabHost.TabContentFactory {


    TabHost tabHost;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        this.tabHost = getTabHost();  // The activity TabHost

        tabHost.addTab(tabHost.newTabSpec("http://www.google.com/").setIndicator("Google").setContent(this));
        tabHost.addTab(tabHost.newTabSpec("http://www.stackoverflow.com/").setIndicator("StackOverflow").setContent(this)); 
    }

    public View createTabContent(String tag) {

        // Inflation per se.
        // we don't return anything yet so we can work with this view
        View tab = View.inflate(this, R.layout.tab, null);

        // Here we work with the view
        // in this case we set the textview to match our tag
        // its a good way to parse arguments to the new tab
        TextView tv = (TextView) tab.findViewById(R.id.url_tv);
        tv.setText(tag);

        //After work we can return view
        return tab;  
    }


    private void addMethod(String webSiteURL, String webSiteName) {

        // Find a way that suits you to pass arguments to here

        tabHost.addTab(tabHost.newTabSpec(webSiteURL).setIndicator(webSiteName).setContent(this));

    }

    private void deleteMethod() {

        // Create a way to decide which tab to delete.
        // for instance, FindViewByTag is a method of ViewGroup and works
        // then call the parent of the view with
        // ViewGroup parent = (ViewGroup) viewToDelete.getParent();
        // finally use oarent.removeView(viewToDelete);

    }

    // Inflates menu when "menu Key" is pressed
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.menu, menu);
        return true;
    }


    // This method is called once the menu is selected
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {


        switch (item.getItemId()) {

            case R.id.add:

                // These variable is created artificially so that something is passed to our addMethod
                // You should find a way to pass these argument to our method
                // can be a dialog screen, or getting the URL from somewhere
                // its your call
                String webSiteURL = "http://www.evonytools.org/";
                String webSiteName = "Tivie's Tools";

                addMethod(webSiteURL, webSiteName);

            case R.id.delete:

                deleteMethod();

                break;
        }
        return true;
    }  
}