Calling one activity inside another activity

Steps to Do this.

(1) Write This code in main source file... make some changes as per your application name and package name. Before writing this code, make sure that you have Button in layout having id as "button1"

Code:

package com.intentapp;

import android.app.Activity;
import android.content.Intent;
import android.view.View;
import android.widget.Button;

public class IntentAppActivity extends Activity {
  /** Called when the activity is first created. */
  Button btnNext;
  @Override
  public void onCreate(Bundle savedInstanceState)
  {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.main);
          btnNext = (Button)findViewById(R.id.button1);
          btnNext.setOnClickListener(new View.onClickListener(){
          public void onClick(View v)
          {
                  Intent i = new Intent(IntentAppActivity.this,IntentA.class);
                  startActivity(i);
          }
        });
}

(2) Create layout file in layout folder. to do this, click on project, right click on it, select new from it, find "Android XML" and name "newlayout.xml" and choose "layout" as type.
Following is code for layout. Path "layout/intenta_layout.xml"

Code:


  android:orientation="vertical"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
/>


(3) Create "IntentA.java" file in package.

Code:

package com.intentapp;

import android.app.Activity;
import android.view.View;
import android.widget.Toast;

public class IntentA extends Activity {
  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.intenta_layout);
  Toast.makeText(this, "Hi!!!", 1000).show();
  }
}

(4) And you have to register your activity in "manifest.xml" file by following code

   

Note: code will be between .. tag.

Both the applications are created by me only and now i have to call my one activity on the button click event of another activity

Did that answer your question?

I have just begun learning about Android, so I cannot help.

Is the activity to be called in your application or an application that was developed by someone else?

You can get more details in the android developers site

http://developer.android.com/guide/topics/fundamentals.html

In the above link look for sub heading "Application Components" and then "Activities", there it is explained in detail.