How to implement the Google IO android app countdown timer in a java app

Question

I am developing an app for a event in my university. So i need a countdown timer for that. Google IO android app had a better countdown timer. The Google IO app in available in GitHub. But in kotlin. https://github.com/google/iosched

I tried finding the components for the countdown timer in the GitHub project. But was not successfully. Can any one guide me to implement this countdown timer. Thanks

Answer 1

 <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:id="@+id/activity_main"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:paddingBottom="@dimen/activity_vertical_margin"
  android:paddingLeft="@dimen/activity_horizontal_margin"
  android:paddingRight="@dimen/activity_horizontal_margin"
  android:paddingTop="@dimen/activity_vertical_margin"
  tools:context="com.example.countdowntimer.MainActivity">

<Button
    android:text="@string/start_timer"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:layout_centerHorizontal="true"
    android:layout_marginBottom="158dp"
    android:id="@+id/button"
    android:textAppearance="?android:attr/textAppearanceLarge"
    android:textStyle="bold|italic" />

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_above="@+id/button"
    android:layout_centerHorizontal="true"
    android:layout_marginBottom="63dp"
    android:id="@+id/textView"
    android:textAppearance="?android:attr/textAppearanceLarge"
    android:textSize="40sp" />

after that

 import android.os.CountDownTimer;
    import android.support.v7.app.AppCompatActivity;
    import android.os.Bundle;
    import android.view.View;
    import android.widget.Button;
    import android.widget.TextView;

 public class MainActivity extends AppCompatActivity  {
public int counter;
Button button;
TextView textView;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    button= (Button) findViewById(R.id.button);
    textView= (TextView) findViewById(R.id.textView);
    button.setOnClickListener(new View.OnClickListener()
    {
        @Override
        public void onClick(View v) {
            new CountDownTimer(30000, 1000){
                public void onTick(long millisUntilFinished){
                    textView.setText(String.valueOf(counter));
                    counter++;
                }
                public  void onFinish(){
                   textView.setText("FINISH!!");
                }
            }.start();
        }
    });
}

}