Getting IllegalStateException on button click

The key part of the full stack trace is found here:

Caused by: android.content.ActivityNotFoundException: Unable to find explicit activity class {com.example.unholyalliance.infinitestream/com.example.unholyalliance.infinitestream.Host}; have you declared this activity in your AndroidManifest.xml

It appears you do not have this Host activity declared in your manifest file. Open AndroidManifest.xml and check for or add the following:

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

Also make sure you fix the issue in Host to first only declare your TextView and then assign the value in onCreate() after setContentView().

private TextView service_status;

@Override
protected void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_host);
    service_status = (TextView) findViewById(R.id.textView1);
    ...
}