Chronometer in Android

Chronometer in Android is useful to implement a simple Timer. It is a subclass of TextView however holds a countdown or count up timer.
In order to create a Chrono-meter, we can make use of the Tag Chronometer like below.

<Chronometer
    android:id="@+id/simpleChronometer"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />

In order to show how the count down and count up timer works, we will be creating both the timers in one activity. Choose a layout titled chronometer_layout.xml like below.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:orientation="vertical">
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Count Down"
        android:textSize="20dp" />
    <Chronometer
        android:id="@+id/count_down"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:countDown="true"
        android:textColor="#008800"
        android:textSize="40dp" />
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Count Up"
        android:textSize="20dp" />
    <Chronometer
        android:id="@+id/count_up"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textColor="#008800"
        android:textSize="40dp" />
    <Button
        android:id="@+id/start"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="start"
        android:textSize="25dp" />
    <Button
        android:id="@+id/stop"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="stop"
        android:textSize="25dp" />
</LinearLayout>

I have used 2 Buttons, start and stop which will start both the timers at the same time. One counts down while the other counts up.

Activity for Chronometer

public class ChronometerActivity extends AppCompatActivity {
   Chronometer chronometer_up;
   Chronometer chronometer_down;
   Button start;
   Button stop;
    @Override
    protected void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        setContentView(R.layout.chronometer);
        chronometer_down = findViewById(R.id.count_down);
        chronometer_up = findViewById(R.id.count_up);
        chronometer_up.setBase(SystemClock.elapsedRealtime());
        chronometer_down.setBase(SystemClock.elapsedRealtime()+600000);
        start = findViewById(R.id.start);
        stop = findViewById(R.id.stop);
        start.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                chronometer_down.start();
                chronometer_up.start();
            }
        });
        stop.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                chronometer_down.stop();
                chronometer_up.stop();
                Toast.makeText(view.getContext(),"Up"+String.valueOf(chronometer_up.getText())+"Down:"+
                String.valueOf(chronometer_down.getText()),Toast.LENGTH_SHORT).show();
            }
        });
    }
}

In this simple activity, we are setting the base for Both the Count-up and Count-down timer. Countdown timer starts 10 minutes (i.e) 60000 milli seconds in advance. Hence, those numbers.

The resulting Application looks like below.