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使用方式注意如下所示，有人喜欢用种方式使用倒计时，这样的确是可以实现计时功能，但是，这样会有个小问题，那就是如果有一个需求是要计时结束后跳转到一个页面A，并且点击其他按钮时也会跳转到一个页面B，如果计时器还在计时，就算你销毁了当前页面，当你跳转到另一个页面B，过一段时间你会发现，突然跳到了A，为什么呢？刚才不是已经销毁了这个页面了吗？其实是你跳转到B页面后，计时器还在计时，当计时结束后就会跳转到你在计时器的回调函数
onFinish() 中指定跳转的页面。
new CountDownTimer(10 * 1000 , 1000) {//加500毫秒是为了解决计时不精确的
@SuppressLint("SetTextI18n") @Override public void onTick(long
millisUntilFinished) { //倒计时的过程中回调该函数 back_home.setText((millisUntilFinished /
1000+1) + " "); } @Override public void onFinish() { //倒计时结束时回调该函数 finish(); }
}.start();
所以我建议的使用方式是如下所示
CountDownTimer mCountDownTimer1; mCountDownTimer1 = new CountDownTimer(10 *
1000 , 1000) {//加500毫秒是为了解决计时不精确的 @SuppressLint("SetTextI18n") @Override public
void onTick(long millisUntilFinished) { //倒计时的过程中回调该函数 back_home.setText("返回主页
"+(millisUntilFinished / 1000+1) + " "); } @Override public void onFinish() {
//倒计时结束时回调该函数 finish(); } }.start();
用以个变量mCountDownTimer1，当我们要跳转到其他页面时，就是用mCountDownTimer1.cancel();方法取消计时器，就不会出现上述情况了
CountDownTimer还会有计时不准确的问题，其实这个问题很多博客都有解析，这里就不再赘述。
