INTENT

New Activity on Button Click

Step1:Class extend as follows:
                                       class Activity1 extends Activity implements OnClickListener {
public

Activity

An activity is a single, focused thing that the user can do. Almost all activities interact with the user, so the Activity class takes care of creating a window for you in which you can place your UI with setContentView(View). While activities are often presented to the user as full-screen windows, they can also be used in other ways: as floating windows (via a theme with windowIsFloating set) or embedded inside of another activity (using ActivityGroup).

Step2:  Define button with in the class as:
                                                         
                                      Button b1=(Button) findViewById(R.id.button2);
                                       b1.setOnClickListener(this);

Step3: Add  intent to onclick:

                                           onClick(View v) {
                                           Intent i=new Intent(this,Activity2.class);
                                           startActivity(i);

Intent

                                        Intent obj=new Intent(this,second_page_activity.class);

Step4: When we define new activity, we have to mention in the Manifest.xml

                                        <activity
                                         android:name=".secondactivity"
                                          />

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