Implementation of CountDownTimer to Realize Countdown Timer Effect in Android

Implement the countdown effect

Example: Send verification code button

Illustration:

/**
 * Countdown
 * 
 * @author admin
 * 
 */
public class MainActivity extends ActionBarActivity {
  private Button tvTime;// Display time
  private MyCountDownTimer myCountDownTimer;// Countdown object
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    tvTime = (Button) findViewById(R.id.time);
    tvTime.setText("Send verification code");
    tvTime.setOnClickListener(new OnClickListener() {
      @Override
      public void onClick(View v) {
        start();
        tvTime.setEnabled(false);// The countdown timer is not clickable
      }
    });
  }
  /**
   * Start
   * 
   * @param view
   */
  public void start() {
    long countDownInterval = 1000;// Interval time
    long millisInFuture = 20000;// Duration
    myCountDownTimer = new MyCountDownTimer(millisInFuture,
        countDownInterval);
    myCountDownTimer.start();
  }
  /**
   * End
   * 
   * @param view
   */
  public void end() {
    if (myCountDownTimer != null) {
      myCountDownTimer.cancel();
    }
  }
  @Override
  protected void onDestroy() {
    super.onDestroy();
    end();
  }
  /**
   * Countdown
   * 
   * @author admin
   * 
   */
  private class MyCountDownTimer extends CountDownTimer {
    public MyCountDownTimer(long millisInFuture, long countDownInterval) {
      super(millisInFuture, countDownInterval);
    }
    // Can directly update UI
    @Override
    public void onTick(long millisUntilFinished) {
      tvTime.setText("Remaining Time:") + millisUntilFinished / 1000);// Convert to seconds
    }
    @Override
    public void onFinish() {
      tvTime.setText("Get Verification Code");
      tvTime.setEnabled(true);// Click only when the time is up
    }
  }
}

That's all for this article, I hope it will be helpful to everyone's study, and I also hope everyone will support the Yelling Tutorial more.

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