Try this..
You can use your code same like it is. just change the package name inside your ComponentName
com.example.testalias.sp
to com.example.testalias
and try again
btn2.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent1 = new Intent();
intent1.setComponent(new ComponentName("com.example.testalias", "com.example.testalias.sp.SecondActivity"));
startActivity(intent1);
}
});