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要在Android中使用計數器，可以使用以下程式碼

 

import android.os.CountDownTimer;

import android.widget.TextView;

 

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

 

LinearLayout lay1 = (LinearLayout) findViewById(R.id.lay1);

final TextView t1 = new TextView(this);;

lay1.addView(t1);

 

new CountDownTimer(30000,1000){      

            @Override

            public void onFinish() {

                // TODO Auto-generated method stub

                t1.setText("Done!");

            }

            @Override

            public void onTick(long millisUntilFinished) {

                // TODO Auto-generated method stub

                t1.setText("seconds remaining:"+millisUntilFinished/1000);

            }

        }.start();

}