ForceCrash.java

import io.fabric.sdk.android.Fabric;
import com.crashlytics.android.Crashlytics;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        
        //This is the most important line.........
        Fabric.with(this, new Crashlytics());
        setContentView(R.layout.activity_main);
    }

    public void forceCrash(View view) {
        throw new RuntimeException("This is a crash");
    }

}