Experiment – 7
Aim Develop a Stop Watch Application using Flutter.
Designer Code
<RelativeLayout
android:gravity="center"
android:background="@drawable/background1"
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="STOP WATCH APP !"
android:background="#FF9800"
android:id="@+id/heading"
android:textSize="35dp"
android:textStyle="bold"
android:textAlignment="center"
android:layout_margin="35dp"
android:padding="10dp"
/>
<Button
android:id="@+id/btnstart"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="START"
android:layout_centerHorizontal="true"
android:layout_below="@+id/heading"
android:layout_margin="10dp"
android:textSize="25dp"
android:padding="10dp"
/>
<Button
android:id="@+id/btnstop"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="STOP"
android:layout_centerHorizontal="true"
android:layout_below="@+id/btnstart"
android:layout_margin="10dp"
android:textSize="25dp"
android:padding="10dp"
/>
<Button
android:id="@+id/btnreset"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="RESET"
android:layout_centerHorizontal="true"
android:layout_below="@+id/btnstop"
android:layout_margin="10dp"
android:textSize="25dp"
android:padding="10dp"
/>
<Chronometer
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/chronometer"
android:textSize="23dp"
android:layout_below="@id/btnreset"
android:layout_centerHorizontal="true"
android:gravity="center"
android:textColor="@color/white"
android:background="#E91E63"
android:layout_margin="10dp"
android:padding="10dp"
/>
</RelativeLayout>
JAVA PROGRAM
public class MainActivity extends AppCompatActivity {
Button start,stop,reset;
Chronometer chronometer;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
EdgeToEdge.enable(this);
setContentView(R.layout.activity_main);
start = (Button) findViewById(R.id.btnstart);
stop = (Button) findViewById(R.id.btnstop);
reset = (Button) findViewById(R.id.btnreset);
chronometer = (Chronometer) findViewById(R.id.chronometer);
// start.setOnClickListener(V-> chronometer.start());
//stop.setOnClickListener(V-> chronometer.stop());
start.setOnClickListener(V-> {
chronometer.setBase(SystemClock.elapsedRealtime());
chronometer.start();
});
stop.setOnClickListener(V->chronometer.stop());
reset.setOnClickListener(V->
chronometer.setBase(SystemClock.elapsedRealtime()));
}
}
Program Output
Result Stop watch Application designed and developed.
