android学习小例子——验证码倒计时按钮

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<Button
android:id="@+id/btn_time"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="获取验证码" />
</RelativeLayout>

public class MainActivity extends Activity {
private Button mTimeButton;
private TimeCount time;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);
mTimeButton = (Button) findViewById(R.id.btn_time);
time = new TimeCount(60000, 1000);
mTimeButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
time.start();
}
});
}
/**
* 继承倒计时类
* @author
*/
class TimeCount extends CountDownTimer {
/**
* 构造方法
* @param millisInFuture
* 总倒计时长 毫秒
* @param countDownInterval
* 倒计时间隔
*/
public TimeCount(long millisInFuture, long countDownInterval) {
super(millisInFuture, countDownInterval);
}
@Override
public void onTick(long millisUntilFinished) {
mTimeButton.setEnabled(false);
mTimeButton.setText(millisUntilFinished / 1000 + "秒");//millisUntilFinished 表示当前已完成时间
}
@Override
public void onFinish() {// 计时结束
mTimeButton.setEnabled(true);
mTimeButton.setText("重新获取");
}
}
}