a.java

Button launchActivityTwoButton = (Button) findViewById(R.id.bLaunchActivityTwo); 
		launchActivityTwoButton.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				// TODO:
				// Launch Activity Two
				// Hint: use Context's startActivity() method
				// Create an intent stating which Activity you would like to start
				try {
					Intent startA2 = new Intent(this, ActivityTwo.class);
					startActivity(startA2);
				} catch (Exception e) {
					// TODO: handle exception
					Log.e(TAG, e.toString());
				}

				
				// Launch the Activity using the intent
				
			
			}
		});