package org.ntlab.irisclient; import androidx.appcompat.app.ActionBar; import androidx.appcompat.app.AppCompatActivity; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.widget.Button; public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ActionBar actionBar = getSupportActionBar(); if(actionBar != null) { actionBar.hide(); } Button entryButton =(Button)findViewById(R.id.entry_room); entryButton.setOnClickListener(new View.OnClickListener() { public void onClick(View v){ Intent intent = new Intent(MainActivity.this,EnterRoomActivity.class); startActivity(intent); } }); } }