How to add tabs dynamically that can be linked to

Question

I am developing an application that uses tabs with each tab being linked to a webpage that the user will be able to see and interact with using webview. what i am having trouble with is implementing a add command that the user will be able to use to add a tab with a url of their choice that works just like the others

Below is my code

Here is the main java file that all other files use

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

Then i have each webpage defined in a seperate java file that the main file calls below is one of them

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);
}
}

I have the menu defined in the main file i just need to construct the methods so the buttons do what they are suppose to do. any help would be great

Answer 1

Ok so I thought I've already answered to your question here

Besides, you seem to like to replicate similar questions here and here

Like I've already told you, you can acomplish this by creating an activity that accepts an url as an extra of an intent.

Taking your code as a base start:

Browser.java

import android.app.Activity;
import android.os.Bundle;
import android.view.KeyEvent;
import android.webkit.WebView;
import android.webkit.WebViewClient;


public class Browser extends Activity {

    private WebView webview;

    private String URL;

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

        Bundle extras = getIntent().getExtras();

        if (extras == null) {

            URL = "http://www.evonytools.org/";

        } else {

            this.URL = extras.getString("URL");
        }

        getWebView();

    }

    public void getWebView() {

        webview = (WebView) findViewById(R.id.webview);
        webview.setWebViewClient(new HelloWebViewClient());
        webview.getSettings().setJavaScriptEnabled(true);
        webview.loadUrl(this.URL);
    }

    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);
    }
}

layout/broswer.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"
>
    <WebView
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:id="@+id/webview"
    />
</LinearLayout>

Main.java

public class Main extends TabActivity{

        private TabHost tabHost;

        private EditText addressBar;

        private final static String DEFAULT_URL = "http://www.evonytools.org/";

        private int z = 0;

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

            this.tabHost = getTabHost();  // The activity TabHost
            this.addressBar = (EditText) findViewById(R.id.address_bar);
            this.addressBar.setText(DEFAULT_URL);


            ImageButton addBtn = (ImageButton) findViewById(R.id.add_btn);

            addBtn.setOnClickListener(new OnClickListener() {

                @Override
                public void onClick(View v) {

                    addMethod();    
                }
            });

            Intent openBrowser = new Intent(); 
            openBrowser.setClass(this, Browser.class);
            openBrowser.putExtra("URL", DEFAULT_URL);
            tabHost.addTab(tabHost.newTabSpec("Main").setIndicator(getHost(DEFAULT_URL)).setContent(openBrowser));

        }




        private void addMethod() {

            String webSiteURL = validateURL(addressBar.getText().toString().trim());
            String webSiteName = getHost(webSiteURL);

            Intent openBrowser = new Intent(); 
            openBrowser.setClass(this, Browser.class);
            openBrowser.putExtra("URL", webSiteURL);

            tabHost.addTab(tabHost.newTabSpec(webSiteName + Integer.toString(z)).setIndicator(webSiteName).setContent(openBrowser));

            ++z;
        }

        private void deleteMethod() {

            // Since we can't really delete a TAB
            // We hide it

            int position = tabHost.getCurrentTab();

            if (position != 0 ) {

                tabHost.getCurrentTabView().setVisibility(8);
                tabHost.setCurrentTab(0);
            }
        }

        // 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:

                    addMethod();

                    break;

                case R.id.delete:

                    deleteMethod();

                    break;
            }
            return true;
        }

        private String validateURL(String url) {

            StringBuffer urlB = new StringBuffer();

            // checks if addressBar has a valid URL
            // you can add stuff here in order to validate
            // this is just an example
            if (url.startsWith("http://")) {urlB.append(url);} else {urlB.append("http://");}

            try {
                URL urlTry = new URL(urlB.toString());

                return urlB.toString();

            } catch (MalformedURLException e) {

                return "http://www.google.com/";
            }   
        }

        private String getHost(String url) {

            try {

                URL urlTry = new URL(url);

                return urlTry.getHost().replace("www.", "").replace(".com", "").replace(".org", "").replace(".net", "");

            } catch (MalformedURLException e) {

                return "Browser";
            }
        }
}

tabs_main.xml

<?xml version="1.0" encoding="utf-8"?>
<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"
            android:tag="tabPane"
             />
        <RelativeLayout
        android:orientation="vertical"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content">
            <EditText
                android:id="@+id/address_bar"
                android:layout_width="270px"
                android:layout_height="50px"
                android:layout_alignParentLeft="true"
                android:layout_alignParentTop="true"
            />
            <ImageButton
                android:id="@+id/add_btn"
                android:layout_width="50px"
                android:layout_height="50px"
                android:src="@android:drawable/ic_menu_add"
                android:background="@android:color/transparent"
                android:layout_toRightOf="@id/address_bar"
            />

        </RelativeLayout>
        <FrameLayout
            android:id="@android:id/tabcontent"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:padding="2dp" />
    </LinearLayout>    

Hope I'm not doing your homework.