错误：java.lang.IllegalStateException: TimerTask is scheduled already

时间：2024-04-30 16:57:23
Process: com.multak.cookaraclient, PID: 27384

java.lang.RuntimeException: Unable to resume activity {…….MainActivity}: java.lang.IllegalStateException: TimerTask is scheduled already

    at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3139)

    at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3170)

    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1420)

    at android.os.Handler.dispatchMessage(Handler.java:102)

    at android.os.Looper.loop(Looper.java:150)

    at android.app.ActivityThread.main(ActivityThread.java:5621)

    at java.lang.reflect.Method.invoke(Native Method)

    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:794)

    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:684)

 Caused by: java.lang.IllegalStateException: TimerTask is scheduled already

    at java.util.Timer.scheduleImpl(Timer.java:569)

    at java.util.Timer.scheduleAtFixedRate(Timer.java:525)

    at com.multak.cookaraclient.MainActivity.onResume(MainActivity.java:453)

    at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1266)

    at android.app.Activity.performResume(Activity.java:6446)

    at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3129)

    at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3170)?

    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1420)?

    at android.os.Handler.dispatchMessage(Handler.java:102)?

    at android.os.Looper.loop(Looper.java:150)?

    at android.app.ActivityThread.main(ActivityThread.java:5621)?

    at java.lang.reflect.Method.invoke(Native Method)?

    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:794)?

    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:684)?
  @Override

    protected void onResume() {

   super.onResume();

        if(timerTask==null){

            timerTask = new TimerTask() {

                @Override

                public void run() {

                    }

            };

            timer.scheduleAtFixedRate(timerTask, 100, 1000);

        }
　　　　　　// timer.scheduleAtFixedRate(timerTask, 100, 1000);
}

一个TimerTask 通过schedule方法使用之后，不能通过schedule方法被调用第二次，如出现则报错误如上。。
如想利用这个timertask时，只能重新获得一个实例

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