Android开发完整项目案例-获取验证码倒计时

需求：

登陆或者注册时点击获取验证码按钮，进行60s倒计时，倒计时过程中不允许点击按钮。倒计时秒数需要实时显示

效果图：

图1是未获取之前，图2是点击之后

思路：

倒计时一般有几种解决方案，常用用Timer，Handler，RxJava。
不过经过测试Timer和Handler时间都有误差，不准。项目建议采用RxJava

关键代码：

在项目的build.gradle中添加RxJava2依赖

implementation 'io.reactivex.rxjava2:rxandroid:2.0.1'
  implementation 'io.reactivex.rxjava2:rxjava:2.0.7'  

注：如果项目已经有RxJava2就不用重复添加了

TimeUtils

public static Disposable dealCountDownS(long second, Consumer<Long> nextObserver, Consumer<Throwable> errorObserver, Action completeObserver ) {
    return Observable
            .interval(1, TimeUnit.SECONDS, AndroidSchedulers.mainThread())
            .take(second)
            .subscribe(nextObserver,errorObserver,completeObserver);
}  

开始使用：

public class RegOneNewActivity extends BaseActivity<RegOneIView, RegOnePresenter> implements RegOneIView {


@BindView(R.id.tv_get_code)
TextView tvGetCode;


//是否开启倒计时
private boolean isStartCountDown;
private Disposable subscription;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    
     initHeadView(R.layout.activity_regist_one_new, false);
    
    showRealView();
}


@Override
protected void initPrClick() {
    super.initPrClick();
    
    //获取验证码
    ViewShow.prClick(tvGetCode, new Action1() {
        @Override
        public void call(Object o) {
            if (!isStartCountDown) {
                onGetRegCode()
            }
        }
    });

   
}

    
public void onGetRegCode() {
    //获取验证码成功，进行倒计时
    isStartCountDown = true;
    //Constant.CODE_COUNTDOWN_TIME :60
    tvGetCode.setText(Constant.CODE_COUNTDOWN_TIME + "s");
    
    subscription = TimeUtils.dealCountDownS(Constant.CODE_COUNTDOWN_TIME, new Consumer<Long>() {

        @Override
        public void accept(Long aLong) throws Exception {
            //每隔一秒
            if (null != tvGetCode) {
                tvGetCode.setText((TextUtils.concat(String.valueOf(Math.abs(aLong - Constant.CODE_COUNTDOWN_TIME)), "s")).toString());
            }
        }
    }, new Consumer<Throwable>() {
       //倒计时错误的回调
        @Override
        public void accept(Throwable throwable) throws Exception {
            if (null != tvGetCode) {
                
                tvGetCode.setText(mContext.getString(R.string.get_code));
            }
            isStartCountDown = false;
        }
    }, new Action() {
       //倒计时完成的回调
        @Override
        public void run() throws Exception {
            if (null != tvGetCode) {
                
                tvGetCode.setText(R.string.get_code);
            }
            isStartCountDown = false;
        }
    });


}


@Override
protected void onDestroy() {
    super.onDestroy();
    if (subscription != null && !subscription.isDisposed()) {
        subscription.dispose();
    }
}

}