MainActivity.java

package premium.app.dashdots;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.KeyEvent;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;

import butterknife.Bind;
import butterknife.ButterKnife;
import butterknife.OnClick;
import butterknife.OnLongClick;

public class MainActivity extends AppCompatActivity implements TextWatcher {

    @Bind(R.id.tv_display) TextView tvDisplay;
    @Bind(R.id.tv_q) TextView tvQ;
    @Bind(R.id.tv_result) TextView tvResult;
    @Bind(R.id.tap) View tap;

    boolean dash;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        ButterKnife.bind(this);

        tvDisplay.setOnEditorActionListener(new TextView.OnEditorActionListener() {
            @Override public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
                return false;
            }
        });

        tvDisplay.setCursorVisible(false);

        tvDisplay.addTextChangedListener(this);
    }

    @OnClick(R.id.btn_prev)
    public void prev(View v) {

        prevNext();
    }

    @OnClick(R.id.btn_next)
    public void next(View v) {

        prevNext();
    }

    private void prevNext() {

        dash = !dash;

        tvDisplay.setText("");

        tvResult.setText("");

        tvQ.setText(dash ? R.string.q2 : R.string.q1);
    }

    @OnClick(R.id.tap)
    public void dot() {
        tvDisplay.setText(".");
    }

    @OnLongClick(R.id.tap)
    public boolean dash(View v) {
        tvDisplay.setText("-");
        return true;
    }


    @Override public void beforeTextChanged(CharSequence s, int start, int count, int after) {

    }

    @Override public void onTextChanged(CharSequence s, int start, int before, int count) {

    }

    @Override public void afterTextChanged(Editable s) {

        tvResult.setText(tvDisplay.getText().toString().equals(dash ? "-" : ".")
                          ? "Correct :)"
                          : "Wrong :(");
    }
}