如何在 Android Studio 1.0.2 中制作计时器？

Question

我有这段代码，但我的应用程序在启动时崩溃了。此代码来自 onCreate 方法。

Timer timer = new Timer();
    timer.schedule(new TimerTask() {

        @Override
        public void run() {
            TextView txtClicks = (TextView) findViewById(R.id.txtClicks);
            // task to be done every 1000 milliseconds
            iClicks = iClicks + 1;
            txtClicks.setText(String.valueOf(iClicks));
        }
    }, 0, 1000);

Answer 1

您在另一个 thread 中。您只能从 UIThread 修改您的 UI。你应该使用：

Timer timer = new Timer();
timer.schedule(new TimerTask() {      
    @Override
    public void run() {
       runOnUiThread(new Runnable(){
       @Override
       public void run(){
        TextView txtClicks = (TextView) findViewById(R.id.txtClicks);
        // task to be done every 1000 milliseconds
        iClicks = iClicks + 1;
        txtClicks.setText(String.valueOf(iClicks));
        }
  });

    }
}, 0, 1000);

Answer 2

这里是一段代码，timerLoopScan和scanPeriod是全局变量：

    timerLoopScan = new Timer();
    TimerTask timerTask = new TimerTask() {
        @Override
        public void run() {
                    loopScan(); // your processings here
            });
        }
    };
    timerLoopScan.scheduleAtFixedRate(timerTask, 0, scanPeriod);

如何在 Android Studio 1.0.2 中制作计时器？

How to make a timer in Android Studio 1.0.2?

java

optimization

time

android

android-studio