Is the TabActivity can be finished in android?

Question 1

I just define TabGroupActivity that will manage the child parent relation for Activities,

TabGroup1Activity.java

package com.tabgroupdemo;  

import android.content.Intent;
import android.os.Bundle;

public class TabGroup1Activity extends TabGroupActivity {
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    startChildActivity("OptionsActivity", new Intent(this, DetailActivity.class));
}
}

DetailActivity.java

package com.tabgroupdemo;

import android.os.Bundle;

public class DetailActivity extends TabGroupActivity {

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

    // write your actual stuff here

}
}

TabGroupActivity.java

package com.tabgroupdemo;

import java.util.ArrayList;

import android.app.Activity;
import android.app.ActivityGroup;
import android.app.LocalActivityManager;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.KeyEvent;
import android.view.Window;

/**
 * The purpose of this Activity is to manage the activities in a tab. Note:
 * Child Activities can handle Key Presses before they are seen here.
 * 
 * @author Eric Harlow
 */
public class TabGroupActivity extends ActivityGroup {

private ArrayList<String> mIdList;
String TAG = getClass().getSimpleName();

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    if (mIdList == null)
        mIdList = new ArrayList<String>();
}

/**
 * This is called when a child activity of this one calls its finish method.
 * This implementation calls {@link LocalActivityManager#destroyActivity} on
 * the child activity and starts the previous activity. If the last child
 * activity just called finish(),this activity (the parent), calls finish to
 * finish the entire group.
 */
@Override
public void finishFromChild(Activity child) {

    Log.v(TAG, "finish from child , mIdList size = " + mIdList.size());
    LocalActivityManager manager = getLocalActivityManager();
    int index = mIdList.size() - 1;

    if (index < 1) {
        finish();
        return;
    }
    manager.destroyActivity(mIdList.get(index), true);
    mIdList.remove(index);
    index--;
    String lastId = mIdList.get(index);
    Intent lastIntent = manager.getActivity(lastId).getIntent();
    Window newWindow = manager.startActivity(lastId, lastIntent);
    setContentView(newWindow.getDecorView());
}

/**
 * Starts an Activity as a child Activity to this.
 * 
 * @param Id
 *            Unique identifier of the activity to be started.
 * @param intent
 *            The Intent describing the activity to be started.
 * @throws android.content.ActivityNotFoundException.
 */
public void startChildActivity(String Id, Intent intent) {
    Window window = getLocalActivityManager().startActivity(Id,
            intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP));
    if (window != null) {
        mIdList.add(Id);
        setContentView(window.getDecorView());
    }
}

/**
 * The primary purpose is to prevent systems before
 * android.os.Build.VERSION_CODES.ECLAIR from calling their default
 * KeyEvent.KEYCODE_BACK during onKeyDown.
 */
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_BACK) {
        return true;
    }
    return super.onKeyDown(keyCode, event);
}

/**
 * Overrides the default implementation for KeyEvent.KEYCODE_BACK so that
 * all systems call onBackPressed().
 */
@Override
public boolean onKeyUp(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_BACK) {
        onBackPressed();
        return true;
    }
    return super.onKeyUp(keyCode, event);
}

/**
 * If a Child Activity handles KeyEvent.KEYCODE_BACK. Simply override and
 * add this method.
 */
public void onBackPressed() {
    int length = mIdList.size();
    if (length > 1) {
        Activity current = getLocalActivityManager().getActivity(
                mIdList.get(length - 1));
        current.finish();
    } else {
        finish();
    }
}
}

in TabGroupActivity.java method, the last line is finish() in else part causes the TabActivity to finish.

Question 2

you can use following code..

intent = new Intent().setClass(this, TabGroup2Activity.class).setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);

spec = tabhost.newTabSpec("Product").setIndicator("Product").setContent(intent);

tabhost.addTab(spec);

This code is using in onCreate() method of main activity in every tab intent object...

Question 3

I'm not sure why the activity won't close, however you shouldn't need

@Override
public void onBackPressed() {
    this.finish();
}

as Android will automatically finish an activity when the back button is pressed.

Question 4

Try this:

@Override
    protected void onPause() {
        // TODO Auto-generated method stub
        super.onPause();
                this.finish();
    }