Android短视频程序获取验证码的倒计时控件

想在Android端短视频程序中获得验证码倒计时控件的方式有两种
第一种方式：

使用Timer和Handler的方式实现倒计时功能

1.初始化时间

/**
 * 初始化时间
 */
 private void initTimer() {
     mAllTotalTime = mTotaltime;
     mTimer = new Timer();
     mTimerTask = new TimerTask() {
 
        @Override
        public void run() {
            mHandler.sendEmptyMessage(COUNT_TIME);
        }
     };
 }

2.通过handler开始时间倒计时

private Handler mHandler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
                case COUNT_TIME:
                    // 对秒数进行格式化
                    DecimalFormat df = new DecimalFormat("#00");
                    String strTotaltime = df.format(mAllTotalTime / 1000);
                    String runtimeText = mPrefixRuntext + strTotaltime + mSuffixRuntext;
 
                    // 对秒数进行颜色设置
                    Spannable spannable = new SpannableString(runtimeText);
                    ForegroundColorSpan redSpan = new ForegroundColorSpan(mColor);
                    spannable.setSpan(redSpan, mPrefixRuntext.length(),                                         mPrefixRuntext.length() + strTotaltime.length(),
                            Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
 
                    CountDownTextView.this.setText(spannable);
                    mAllTotalTime -= mOnetime;
                    if (mAllTotalTime < 0) {
                        CountDownTextView.this.setText(mFinishtext);
                        isRun = false;
                        clearTimer();
                        mDownTime.onFinish();
                    }
                    break;
                default:
                    break;
            }
        }
    };

第二种方式：

使用Rxjava和RxBinding

添加依赖

 //Rxjava
 implementation 'io.reactivex.rxjava2:rxjava:2.1.1'
 implementation 'io.reactivex.rxjava2:rxandroid:2.0.1'
 //Rxbinding
 implementation 'com.jakewharton.rxbinding2:rxbinding:2.0.0'
 implementation 'com.jakewharton.rxbinding2:rxbinding-support-v4:2.0.0'
 implementation 'com.jakewharton.rxbinding2:rxbinding-appcompat-v7:2.0.0'

实现方式：

private void initTimer() {
        mObservableCountTime = RxView.clicks(mTvTime).throttleFirst(1, TimeUnit.SECONDS)
                .subscribeOn(AndroidSchedulers.mainThread())
                .flatMap(new Function<Object, ObservableSource<Boolean>>() {
                    @Override
                    public ObservableSource<Boolean> apply(Object o) throws Exception {
                        if (TextUtils.isEmpty(getPhone())) {
                            return Observable.empty();
                        }
                        return Observable.just(true);
                    }
                })
                .flatMap(new Function<Boolean, ObservableSource<Long>>() {
                    @Override
                    public ObservableSource<Long> apply(Boolean aBoolean) throws Exception {
                        //更新发送按钮的状态并初始化显现倒计时文字
                        mTvTime.setEnabled(false);
                        RxView.enabled(mTvTime).accept(false);
                        RxTextView.text(mTvTime).accept(mPrefixRuntext + mTotaltime + mSuffixRuntext);
                        //在实际操作中可以在此发送获取网络的请求
                        mDownTime.onTimerClick();
 
                        return Observable.interval(1, TimeUnit.SECONDS, Schedulers.io())
                                .take(mTotaltime)
                                //将递增数字替换成递减的倒计时数字
                                .map(new Function<Long, Long>() {
                                    @Override
                                    public Long apply(Long aLong) throws Exception {
                                        return mTotaltime - (aLong + 1);
                                    }
                                });
                    }
                }).observeOn(AndroidSchedulers.mainThread());
 
        mConsumerCountTime = new Consumer<Long>() {
            @Override
            public void accept(Long aLong) throws Exception {
                //当倒计时为 0 时，还原 btn 按钮
                if (aLong == 0) {
                    mTvTime.setEnabled(true);
                    RxView.enabled(mTvTime).accept(true);
                    RxTextView.text(mTvTime).accept(mFinishtext);
                } else {
                    mTvTime.setEnabled(false);
                    RxTextView.text(mTvTime).accept(mPrefixRuntext + aLong + mSuffixRuntext);
                }
            }
        };
 
        //订阅
        mDisposable = mObservableCountTime.subscribe(mConsumerCountTime);
    }