Hello Friends, Today I am going to share very Important post for Child Group Activity, means activity open inside Tab Group. For this I use Animated Activity. This logic I picked from stackoverflow.com. Hope it will help some one.

Print Screen:

1. Create a new project, name TabGroupChildDemo.
2. Create an TabHostActivity and extend it to TabActivity.
3. Create 3 other activity name-HomeActivity, AboutActivity, ContactActivity.
4. Create 3 group activity name-HomeGroupActivity, AboutGroupActivity, ContactGroupActivity.
5. Create an other Activity ChildActivity.java.
6. Create 4 layout for Home, About, Contact, Child Activity, name activity_home, activity_about, activity_contact, activity_child.
7. Create 3 other layout for display tabs- home_tab,about_tab,contact_tab.
8. Add activity and group activity in manifest.xml
9. Add images – home.png, about.png, contact.png, ic_tab_background in drawable folder, download below images

My Code:

TabHostActivity.java

package com.manish.tabdemo;

import android.app.TabActivity;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PorterDuff.Mode;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.RectF;
import android.os.Bundle;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.inputmethod.InputMethodManager;
import android.widget.LinearLayout;
import android.widget.TabHost;
import android.widget.TabHost.OnTabChangeListener;
import android.widget.TabWidget;
import android.widget.TextView;



@SuppressWarnings("deprecation")
public class TabHostActivity extends TabActivity implements OnTabChangeListener
{ 
 private static final String[] TABS = { "HomeGroupActivity", "AboutGroupActivity", "ContactGroupActivity" };
 private static final String[] TAB_NAMES = { "Home", "About", "Contact"};
 public static TabHost tabs ;
 public static TabWidget tabWidget ; 
 protected Bitmap roundedImage;
 public boolean checkTabsListener = false;
 
 
 public void onCreate(Bundle icicle)
 { 
 super.onCreate(icicle);
 setContentView(R.layout.activity_tab_host);
 
 Bitmap roundedImage = BitmapFactory.decodeResource(getResources(),R.drawable.ic_tab_background);
 roundedImage = getRoundedCornerBitmap(roundedImage,3);
 
 tabs = getTabHost();
 
 tabWidget = tabs.getTabWidget();
 
 tabs.setOnTabChangedListener(this);
 
 for (int i = 0; i < TABS.length; i++)
 {
 TabHost.TabSpec tab = tabs.newTabSpec(TABS[i]);
 
 //Asociating Components
 ComponentName oneActivity = new ComponentName("com.manish.tabdemo", "com.manish.tabdemo." + TABS[i]);
 Intent intent = new Intent().setComponent(oneActivity); 
 intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
 tab.setContent(intent); 
 //Setting the Indicator
 MyTabIndicator myTab = new MyTabIndicator(this, TAB_NAMES[i],(i+1), roundedImage); 
 tab.setIndicator(myTab); 
 tabs.addTab(tab);
 }
 
 checkTabsListener = true;
 
 for(int i=0;i<tabs.getTabWidget().getChildCount();i++)
 {
 tabs.getTabWidget().getChildAt(i).setBackgroundColor(Color.TRANSPARENT);
 }
 
 
 tabs.getTabWidget().getChildAt(0).setBackgroundResource(R.drawable.ic_tab_background); 
 
 //Maintaining Clicks
 
 // Home Tab Click
 
 tabWidget.getChildAt(0).setOnClickListener(new OnClickListener()
 { 
 @Override
 public void onClick(View v)
 { 
 if(HomeGroupActivity.HomeGroupStack != null && HomeGroupActivity.HomeGroupStack.mIdList.size()>1)
 { 
 HomeGroupActivity.HomeGroupStack.getLocalActivityManager().removeAllActivities();
 HomeGroupActivity.HomeGroupStack.mIdList.clear();
 HomeGroupActivity.HomeGroupStack.mIntents.clear();
 HomeGroupActivity.HomeGroupStack.mAnimator.removeAllViews();
 HomeGroupActivity.HomeGroupStack.startChildActivity("CareGroupActivity", new Intent(HomeGroupActivity.HomeGroupStack, HomeActivity.class));
 finish();
 }
 
 tabWidget.setCurrentTab(0);
 tabs.setCurrentTab(0);
 tabs.getTabWidget().getChildAt(0).setBackgroundResource(R.drawable.ic_tab_background); 
 }
 });
 
 
 // About tab Click
 
 tabWidget.getChildAt(1).setOnClickListener(new OnClickListener()
 { 
 public void onClick(View v)
 { 
 if(AboutGroupActivity.AboutGroupStack != null && AboutGroupActivity.AboutGroupStack.mIdList.size()>0)
 {
 AboutGroupActivity.AboutGroupStack.getLocalActivityManager().removeAllActivities();
 AboutGroupActivity.AboutGroupStack.mIdList.clear(); 
 AboutGroupActivity.AboutGroupStack.mIntents.clear();
 AboutGroupActivity.AboutGroupStack.mAnimator.removeAllViews(); 
 AboutGroupActivity.AboutGroupStack.startChildActivity("TrackingGroupActivity", new Intent(AboutGroupActivity.AboutGroupStack, AboutActivity.class)); 
 } 
 
 tabWidget.setCurrentTab(1);
 tabs.setCurrentTab(1);
 tabs.getTabWidget().getChildAt(1).setBackgroundResource(R.drawable.ic_tab_background); 
 }
 });
 
 // Contact tab click
 
 tabWidget.getChildAt(2).setOnClickListener(new OnClickListener()
 { 
 public void onClick(View v)
 { 
 if(ContactGroupActivity.ContactGroupStack != null && ContactGroupActivity.ContactGroupStack.mIdList.size()>0)
 {
 
 ContactGroupActivity.ContactGroupStack.getLocalActivityManager().removeAllActivities();
 ContactGroupActivity.ContactGroupStack.mIdList.clear(); 
 ContactGroupActivity.ContactGroupStack.mIntents.clear();
 ContactGroupActivity.ContactGroupStack.mAnimator.removeAllViews(); 
 ContactGroupActivity.ContactGroupStack.startChildActivity("DashboardGroupActivity", new Intent(ContactGroupActivity.ContactGroupStack, ContactActivity.class)); 
 } 
 
 tabWidget.setCurrentTab(2);
 tabs.setCurrentTab(2);
 tabs.getTabWidget().getChildAt(2).setBackgroundResource(R.drawable.ic_tab_background); 
 }
 });
 

 }
 
 
 public class MyTabIndicator extends LinearLayout 
 {
 public MyTabIndicator(Context context, String label, int tabId, Bitmap bgImg)
 {
 super(context);
 LinearLayout tab = null;
 TextView tv;
 this.setGravity(Gravity.CENTER);
 
 if(tabId == 1)
 {
 tab = (LinearLayout) LayoutInflater.from(context).inflate(R.layout.home_tab, null);
 tv = (TextView)tab.findViewById(R.id.tab_label);
 tv.setText(label);
 }
 
 
 
 else if(tabId == 2)
 {
 tab = (LinearLayout) LayoutInflater.from(context).inflate(R.layout.about_tab, null);
 tv = (TextView)tab.findViewById(R.id.tab_label);
 tv.setText(label);
 }
 else if(tabId == 3)
 {
 tab = (LinearLayout) LayoutInflater.from(context).inflate(R.layout.contact_tab, null);
 tv = (TextView)tab.findViewById(R.id.tab_label);
 tv.setText(label);
 }
 
 this.addView(tab, new LinearLayout.LayoutParams(320/4,55)); 
 } 
 }

 
 
 public void onTabChanged(String tabId) 
 { 
 InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
 imm.hideSoftInputFromWindow(tabs.getApplicationWindowToken(), 0);
 
 for(int i=0; i<tabs.getTabWidget().getChildCount(); i++)
 { 
 if(tabId.equalsIgnoreCase(TABS[i]))
 { 
 tabs.getTabWidget().getChildAt(i).setBackgroundResource(R.drawable.ic_tab_background); 
 }
 else
 {
 tabs.getTabWidget().getChildAt(i).setBackgroundColor((Color.TRANSPARENT));
 } 
 } 
 }

 public static Bitmap getRoundedCornerBitmap(Bitmap bitmap,float roundPxRadius)
 {
 Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Config.ARGB_8888);
 Canvas canvas = new Canvas(output);
 
 final int color = 0xff424242;
 final Paint paint = new Paint();
 final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
 final RectF rectF = new RectF(rect);
 final float roundPx =roundPxRadius;
 
 paint.setAntiAlias(true);
 canvas.drawARGB(0, 0, 0, 0);
 paint.setColor(color);
 canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
 
 paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
 canvas.drawBitmap(bitmap, rect, rect, paint);
 
 return output;
 }
 
 public void onResume()
 {
 super.onResume();
 
 
 //ReConstructing TabViews
 reDesignTabViews(); 
 }
 
 public void onPause()
 {
 super.onPause(); 
 }
 

 
 
 /**
 * Method used to re constructing the Views at tab bar. This solves tabs disappearing issue.
 */
 public void reDesignTabViews()
 {
 MyTabIndicator myIndicator;
 
 
 //Construction of tab views....
 for(int i=0 ; i< tabWidget.getChildCount() ; i++)
 {
 myIndicator = (MyTabIndicator) tabWidget.getChildAt(i);
 myIndicator.removeAllViews();
 
 switch (i) 
 {

 case 0:
 myIndicator.addView((LinearLayout) LayoutInflater.from(getApplicationContext()).inflate(R.layout.home_tab, null));
 break;
 case 1: 
 myIndicator.addView((LinearLayout) LayoutInflater.from(getApplicationContext()).inflate(R.layout.about_tab, null)); 
 break;
 case 2: 
 myIndicator.addView((LinearLayout) LayoutInflater.from(getApplicationContext()).inflate(R.layout.contact_tab, null)); 
 break;
 
 } 
 } 
 }
 
}

HomeActivity.java

package com.manish.tabdemo;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

import com.manish.util.AnimatedActivity;

public class HomeActivity extends Activity {
 Button button1;

 @Override
 public void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_home);
 button1 = (Button) findViewById(R.id.button1);
 button1.setOnClickListener(new OnClickListener() {

 @Override
 public void onClick(View v) {
 // TODO Auto-generated method stub

 AnimatedActivity pActivity = (AnimatedActivity) HomeActivity.this
 .getParent();
 Intent intent = new Intent(HomeActivity.this,
 ChildActivity.class);
 pActivity.startChildActivity("home_screen", intent);
 }
 });
 }

 @Override
 public void onBackPressed() {
 System.out.println("***back*");
 HomeActivity.super.onBackPressed();
 }

 @Override
 public boolean onKeyDown(int keyCode, KeyEvent event) {
 System.out.println("****event****" + event + "****" + keyCode);
 if (keyCode == KeyEvent.KEYCODE_BACK) {

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

HomeGroupActivity.java

package com.manish.tabdemo;

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

import com.manish.util.AnimatedActivity;

public class HomeGroupActivity extends AnimatedActivity {
 public static HomeGroupActivity HomeGroupStack;

 @Override
 public void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 HomeGroupStack = HomeGroupActivity.this;

 startChildActivity("HomeGroupActivity", new Intent(this,
 HomeActivity.class));
 }
}

AboutActivity.java

package com.manish.tabdemo;

import android.app.Activity;
import android.os.Bundle;

public class AboutActivity extends Activity {
 @Override
 public void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_about);
 }
}

AboutGroupActivity.java

package com.manish.tabdemo;

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

import com.manish.util.AnimatedActivity;

public class AboutGroupActivity extends AnimatedActivity {
 public static AboutGroupActivity AboutGroupStack;

 @Override
 public void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 AboutGroupStack = AboutGroupActivity.this;

 startChildActivity("AboutGroupActivity", new Intent(this,
 AboutActivity.class));
 }
}

ContactActivity.java

package com.manish.tabdemo;

import android.app.Activity;
import android.os.Bundle;

public class ContactActivity extends Activity {
 @Override
 public void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_contact);
 }
}

ContactGroupActivity.java

package com.manish.tabdemo;

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

import com.manish.util.AnimatedActivity;

public class ContactGroupActivity extends AnimatedActivity {
 public static ContactGroupActivity ContactGroupStack;

 @Override
 public void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 ContactGroupStack = ContactGroupActivity.this;

 startChildActivity("ContactGroupActivity", new Intent(this,
 ContactActivity.class));
 }
}

ChildActivity.java

package com.manish.tabdemo;

import android.app.Activity;
import android.os.Bundle;

public class ChildActivity extends Activity {
 @Override
 public void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_child);
 }
}

activity_tab_host.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:layout_width="fill_parent"
 android:layout_height="fill_parent"
 android:orientation="vertical" >

 <FrameLayout
 android:id="@android:id/tabcontent"
 android:layout_width="fill_parent"
 android:layout_height="0dip"
 android:layout_weight="1" />

 <TabWidget
 android:id="@android:id/tabs"
 android:layout_width="fill_parent"
 android:layout_height="wrap_content"
 android:layout_marginBottom="-4dp"
 android:layout_weight="0" />
 </LinearLayout>

</TabHost>

activity_home.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent"
 android:background="#0099CC" >

 <TextView
 android:id="@+id/textView1"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_centerHorizontal="true"
 android:layout_centerVertical="true"
 android:text="Home Tab"
 android:textColor="#ffffff"
 android:textSize="35sp" />

 <Button
 android:id="@+id/button1"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_below="@+id/textView1"
 android:layout_centerHorizontal="true"
 android:text="Open Child" />

</RelativeLayout>

home_tab.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_centerInParent="true"
 android:gravity="center"
 android:orientation="vertical" >

 <TextView
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_marginBottom="1dip"
 android:layout_marginTop="2dip"
 android:background="@drawable/home" >
 </TextView>

 <TextView
 android:id="@+id/tab_label"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:text="Home"
 android:textColor="#0099CC" />

</LinearLayout>

activity_about.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent"
 android:background="#808080" >

 <TextView
 android:id="@+id/textView1"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_centerHorizontal="true"
 android:layout_centerVertical="true"
 android:text="About Tab"
 android:textColor="#ffffff"
 android:textSize="35sp" />

</RelativeLayout>

about_tab.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_centerInParent="true"
 android:gravity="center"
 android:orientation="vertical" >

 <TextView
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_marginBottom="1dip"
 android:layout_marginTop="2dip"
 android:background="@drawable/about" >
 </TextView>

 <TextView
 android:id="@+id/tab_label"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:text="About"
 android:textColor="#0099CC" />

</LinearLayout>

activity_contact.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent"
 android:background="#ffdddd" >

 <TextView
 android:id="@+id/textView1"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_centerHorizontal="true"
 android:layout_centerVertical="true"
 android:text="Contact Tab"
 android:textColor="#000000"
 android:textSize="35sp" />

</RelativeLayout>

contact_tab.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_centerInParent="true"
 android:gravity="center"
 android:orientation="vertical" >

 <TextView
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_marginBottom="1dip"
 android:layout_marginTop="2dip"
 android:background="@drawable/contact" >
 </TextView>

 <TextView
 android:id="@+id/tab_label"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:text="Contact"
 android:textColor="#0099CC" />

</LinearLayout>

activity_child.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="fill_parent"
 android:background="#0099CC"
 android:layout_height="fill_parent" >

 <TextView
 android:id="@+id/textView1"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_centerHorizontal="true"
 android:layout_centerVertical="true"
 android:text="Child Activity"
 android:textSize="35sp"
 android:textColor="#ffffff" />

</RelativeLayout>

manifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
 package="com.manish.tabdemo"
 android:versionCode="1"
 android:versionName="1.0" >

 <uses-sdk
 android:minSdkVersion="8"
 android:targetSdkVersion="16" />

 <application
 android:allowBackup="true"
 android:icon="@drawable/ic_launcher"
 android:label="@string/app_name"
 android:theme="@style/AppTheme" >
 <activity
 android:name="com.manish.tabdemo.TabHostActivity"
 android:label="@string/app_name" >
 <intent-filter>
 <action android:name="android.intent.action.MAIN" />

 <category android:name="android.intent.category.LAUNCHER" />
 </intent-filter>
 </activity>
 <activity android:name="com.manish.tabdemo.HomeActivity" />
 <activity android:name="com.manish.tabdemo.AboutActivity" />
 <activity android:name="com.manish.tabdemo.ContactActivity" />
 <activity android:name="com.manish.tabdemo.ChildActivity" />
 <activity android:name="com.manish.tabdemo.AboutGroupActivity" />
 <activity android:name="com.manish.tabdemo.ContactGroupActivity" />
 <activity android:name="com.manish.tabdemo.HomeGroupActivity" />
 </application>

</manifest>

You can refer below link for original post for “simple tab host activity” – http://www.androidhub4you.com/2013/04/android-tabactivity-tab-layout-demo-tab.html