Android：CountDownTimer跳过最后一个onTick（）！

Question

码：

public class SMH extends Activity {

    public void onCreate(Bundle b) {  
        super.onCreate(b);  
        setContentView(R.layout.main);

        TextView tv = (TextView) findViewById(R.id.tv);

        new CountDownTimer(10000, 2000) {  
            public void onTick(long m) {  
               long sec = m/1000+1;  
               tv.append(sec+" seconds remain\n");  
            }  
            public void onFinish() {  
               tv.append("Done!");  
            }  
        }.start();  
   }

输出：
剩余10秒剩余
8秒剩余
6秒剩余
4秒剩余
完成！

问题：

如何显示“ 剩余2秒 ”？经过的时间确实是10秒，但是最后一个onTick（）永远不会发生。如果我将第二个参数从2000更改为1000，则输出为：

剩余10秒剩余
9秒剩余
8秒剩余
7秒剩余
6秒剩余
5秒剩余
4秒剩余
3秒剩余
2秒剩余
完成！

如此看来，似乎跳过了最后一个onTick（）调用。顺便说一句，XML文件基本上是默认的main.xml，其中TextView分配了ID tv
，文本设置为“”。

Answer 1

我不知道为什么最后一个刻度不起作用，但是例如可以使用Runable创建自己的计时器。

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);
    }
}

然后开始

new MyCountDownTimer(10000, 2000).Start();

编辑高飞的问题

您应该有一个变量来保存计数器状态（布尔值）。那么您可以编写Stop（）方法，例如Start（）。

编辑2高飞的问题

实际上，没有停止计数器的错误，但是在stop（resume）之后再次启动时存在错误。

我正在写一个刚刚尝试过的新的更新的完整代码，它正在工作。这是一个基本的计数器，带有“开始”和“停止”按钮在屏幕上显示时间。

柜台类

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);
    }
}

活动课

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.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:weightSum="1">
    <TextView android:textAppearance="?android:attr/textAppearanceLarge" 
              android:text="TextView" android:layout_height="wrap_content" 
              android:layout_width="wrap_content" 
              android:id="@+id/time">
    </TextView>
    <Button android:text="Start" 
            android:id="@+id/start" 
            android:layout_width="wrap_content" 
            android:layout_height="wrap_content" 
            android:onClick="StartTimer">
    </Button>
    <Button android:text="Stop" 
            android:id="@+id/stop" 
            android:layout_width="wrap_content" 
            android:layout_height="wrap_content" 
            android:onClick="StopTimer">
    </Button>
</LinearLayout>