问题描述
代码:
public class SMH extends Activity {公共无效 onCreate(Bundle b) {super.onCreate(b);setContentView(R.layout.main);TextView tv = (TextView) findViewById(R.id.tv);新倒计时(10000, 2000){公共无效 onTick(长米){长秒 = m/1000+1;tv.append(sec+" 剩余秒数
");}公共无效 onFinish() {tv.append("完成！");}}.开始();}输出:
还剩 10 秒
还剩 8 秒
还剩 6 秒
还剩 4 秒
完毕！
问题:
如何让它显示还剩 2 秒"?经过的时间确实是 10 秒，但最后一次 onTick() 从未发生.如果我将第二个参数从 2000 更改为 1000，则输出如下:
还剩 10 秒
还剩 9 秒
还剩 8 秒
还剩 7 秒
还剩 6 秒
还剩 5 秒
还剩 4 秒
还剩 3 秒
还剩 2 秒
完毕！
所以你看，它似乎跳过了最后一个 onTick() 调用.顺便说一句，tv 并且文本设置为".
我不知道为什么最后一个滴答声不起作用，但您可以使用 Runable ，例如.
class MyCountDownTimer {私人长期millisInFuture；私人长countDownInterval;公共 MyCountDownTimer(长 pMillisInFuture，长 pCountDownInterval){this.millisInFuture = pMillisInFuture;this.countDownInterval = pCountDownInterval;}公共无效开始(){final Handler handler = new Handler();Log.v("状态", "开始");最终 Runnable 计数器 = new Runnable(){公共无效运行(){如果(millisInFuture <= 0){Log.v("状态", "完成");} 别的 {长秒 = millisInFuture/1000;Log.v("status", Long.toString(sec) + "剩余秒数");millisInFuture -= countDownInterval;handler.postDelayed(this, countDownInterval);}}};handler.postDelayed(counter, countDownInterval);}}然后开始，
new MyCountDownTimer(10000, 2000).Start();编辑高飞的问题
你应该有一个变量来保存计数器状态 (boolean) .然后你可以写一个Stop()方法，比如Start().
编辑 2 高飞的问题
实际上停止计数器没有错误，但停止(恢复)后再次启动有错误.
我正在编写一个新的更新的完整代码，我刚刚尝试过，它正在运行.这是一个基本的计数器，通过开始和停止按钮在屏幕上显示时间.
计数器类
公共类 MyCountDownTimer {私人长期millisInFuture；私人长countDownInterval;私有布尔状态；公共 MyCountDownTimer(长 pMillisInFuture，长 pCountDownInterval){this.millisInFuture = pMillisInFuture;this.countDownInterval = pCountDownInterval;状态 = 假；初始化();}公共无效停止(){状态 = 假；}公共长 getCurrentTime() {返回millisInFuture；}公共无效开始(){状态 = 真；}公共无效初始化(){final Handler handler = new Handler();Log.v("状态", "开始");最终 Runnable 计数器 = new Runnable(){公共无效运行(){长秒 = millisInFuture/1000;如果(状态){如果(millisInFuture <= 0){Log.v("状态", "完成");} 别的 {Log.v("status", Long.toString(sec) + "剩余秒数");millisInFuture -= countDownInterval;handler.postDelayed(this, countDownInterval);}} 别的 {Log.v("status", Long.toString(sec) + " 剩余秒数，计时器已停止！");handler.postDelayed(this, countDownInterval);}}};handler.postDelayed(counter, countDownInterval);}}活动课
公共类 CounterActivity 扩展 Activity {/** 在第一次创建活动时调用.*/TextView 时间文本；按钮开始但是；按钮停止但是；MyCountDownTimer mycounter;@覆盖public void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);timeText = (TextView) findViewById(R.id.time);startBut = (Button) findViewById(R.id.start);stopBut = (Button) findViewById(R.id.stop);mycounter = new MyCountDownTimer(20000, 1000);刷新定时器()；}public void StartTimer(View v) {Log.v("startbutton", "saymaya basladi");mycounter.Start();}public void StopTimer(View v) {Log.v("stopbutton", "durdu");mycounter.Stop();}public void RefreshTimer(){final Handler handler = new Handler();最终 Runnable 计数器 = new Runnable(){公共无效运行(){timeText.setText(Long.toString(mycounter.getCurrentTime()));handler.postDelayed(this, 100);}};handler.postDelayed(counter, 100);}}main.
</TextView><按钮 android:text="开始"android:id="@+id/开始"android:layout_width="wrap_content"android:layout_height="wrap_content"android:onClick="StartTimer"></按钮><按钮 android:text="停止"android:id="@+id/停止"android:layout_width="wrap_content"android:layout_height="wrap_content"android:onClick="StopTimer"></按钮></LinearLayout>Code:
Output:
10 seconds remain
8 seconds remain
6 seconds remain
4 seconds remain
Done!
Problem:
How do I get it to show "2 seconds remain"? The time elapsed is indeed 10 seconds, but the last onTick() never happens. If I change the second parameter from 2000 to 1000, then this is the output:
10 seconds remain
9 seconds remain
8 seconds remain
7 seconds remain
6 seconds remain
5 seconds remain
4 seconds remain
3 seconds remain
2 seconds remain
Done!
So you see, it seems to be skipping that last onTick() call. And btw, the tv and the text set to "".
I don't know why the last tick is not working but you can create your own timer with Runable , for example.
class MyCountDownTimer {
private long millisInFuture;
private long countDownInterval;
public MyCountDownTimer(long pMillisInFuture, long pCountDownInterval) {
this.millisInFuture = pMillisInFuture;
this.countDownInterval = pCountDownInterval;
}
public void Start()
{
final Handler handler = new Handler();
Log.v("status", "starting");
final Runnable counter = new Runnable(){
public void run(){
if(millisInFuture <= 0) {
Log.v("status", "done");
} else {
long sec = millisInFuture/1000;
Log.v("status", Long.toString(sec) + " seconds remain");
millisInFuture -= countDownInterval;
handler.postDelayed(this, countDownInterval);
}
}
};
handler.postDelayed(counter, countDownInterval);
}
}
and to start it,
new MyCountDownTimer(10000, 2000).Start();
EDIT FOR GOOFY'S QUESTION
you should have a variable to hold counter status (boolean) . then you can write a Stop() method like Start().
EDIT-2 FOR GOOFY'S QUESTION
actually there is no bug on stopping counter but there is a bug on start again after stop(resume).
I'm writing a new updated full code that I had just tried and it's working. It's a basic counter that show time on screen with start and stop button.
class for counter
public class MyCountDownTimer {
private long millisInFuture;
private long countDownInterval;
private boolean status;
public MyCountDownTimer(long pMillisInFuture, long pCountDownInterval) {
this.millisInFuture = pMillisInFuture;
this.countDownInterval = pCountDownInterval;
status = false;
Initialize();
}
public void Stop() {
status = false;
}
public long getCurrentTime() {
return millisInFuture;
}
public void Start() {
status = true;
}
public void Initialize()
{
final Handler handler = new Handler();
Log.v("status", "starting");
final Runnable counter = new Runnable(){
public void run(){
long sec = millisInFuture/1000;
if(status) {
if(millisInFuture <= 0) {
Log.v("status", "done");
} else {
Log.v("status", Long.toString(sec) + " seconds remain");
millisInFuture -= countDownInterval;
handler.postDelayed(this, countDownInterval);
}
} else {
Log.v("status", Long.toString(sec) + " seconds remain and timer has stopped!");
handler.postDelayed(this, countDownInterval);
}
}
};
handler.postDelayed(counter, countDownInterval);
}
}
activity class
public class CounterActivity extends Activity {
/** Called when the activity is first created. */
TextView timeText;
Button startBut;
Button stopBut;
MyCountDownTimer mycounter;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
timeText = (TextView) findViewById(R.id.time);
startBut = (Button) findViewById(R.id.start);
stopBut = (Button) findViewById(R.id.stop);
mycounter = new MyCountDownTimer(20000, 1000);
RefreshTimer();
}
public void StartTimer(View v) {
Log.v("startbutton", "saymaya basladi");
mycounter.Start();
}
public void StopTimer(View v) {
Log.v("stopbutton", "durdu");
mycounter.Stop();
}
public void RefreshTimer()
{
final Handler handler = new Handler();
final Runnable counter = new Runnable(){
public void run(){
timeText.setText(Long.toString(mycounter.getCurrentTime()));
handler.postDelayed(this, 100);
}
};
handler.postDelayed(counter, 100);
}
}
main.
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