First Activity in android TextView:-

first activity:-

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/linearLayout1"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >
 
    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="I&apos;m screen 1 (main.xml)"
        android:textAppearance="?android:attr/textAppearanceLarge" />
 
    <Button
        android:id="@+id/button1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Click me to another screen" />
 
</LinearLayout>

second activity:-

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/linearLayout1"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >
 
    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="I&apos;m screen 2 (main2.xml)"
        android:textAppearance="?android:attr/textAppearanceLarge" />
 
</LinearLayout>


 Intent intent = new Intent(context, anotherActivity.class);
    startActivity(intent);
MainActivity:-
 
public class AppActivity extends Activity {
 
 Button button;
 
 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
  addListenerOnButton();
 }
 
 public void addListenerOnButton() {
 
  final Context context = this;
 
  button = (Button) findViewById(R.id.button1);
 
  button.setOnClickListener(new OnClickListener() {
 
   @Override
   public void onClick(View arg0) {
 
       Intent intent = new Intent(context, App2Activity.class);
                            startActivity(intent);   
 
   }
 
  });
 
 }
 
}

ActivitySecond:-


public class App2Activity extends Activity {
 
 Button button;
 
 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main2);
 }
 
}


in manifeast you shuld Append :-to go to second activity


 <activity
            android:label="@string/app_name"
            android:name=".SecondActivity" >
        </activity>