一值总觉得timer怪怪的，就是不知道怎么解释，这个解释正到好处。
TimerTasks are not ideal to use in an android environment because they're not context-aware. If your context goes away, the TimerTask will still wait patiently in the background, eventually firing and potentially crashing your app because its activity was previously finished. Or, it may keep references to your activity around after it's been closed, preventing it from being garbage collected and potentially making your app run out of memory.
Instead, use postDelayed(), which will automatically cancel the task when the activity is shut down.
finalintdelay=5000;finalintperiod=1000;finalRunnabler=newRunnable(){publicvoidrun(){Toast.makeText(getApplicationContext(),"RUN!",Toast.LENGTH_SHORT).show();postDelayed(this,period);}};postDelayed(r,delay);
By the way, if you ever need to cancel your task manually, you can use removeCallbacks(r) where r is the runnable you posted previously
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