Android 9th Lesson-Timer Chronometer

Source: Internet
Author: User

I studied clocks and timers today.

I think AnalogClock and DigitalClock can use it directly. The only thing you need to know is that AnalogClock can modify the dial and minute hand.

Methods are Android:dail and Android:hand_minute and Hand_hour.

The use of timers is described below.

First, just put a chronometer and a button in the XML. In order to click the Start button, start the timer, 20s stop.

 PackageCom.example.chronometer;;ImportAndroid.os.Bundle;ImportAndroid.os.SystemClock;ImportAndroid.view.View;ImportAndroid.view.View.OnClickListener;ImportAndroid.widget.Button;ImportAndroid.widget.Chronometer;ImportAndroid.widget.Chronometer.OnChronometerTickListener; Public classMainactivityextendsActivity {chronometer ch;    Button start; @Overrideprotected voidonCreate (Bundle savedinstancestate) {Super. OnCreate (savedinstancestate);        Setcontentview (R.layout.activity_main); CH=(chronometer) Findviewbyid (; Start=(Button) Findviewbyid (; Start.setonclicklistener (NewOnclicklistener () {@Override Public voidOnClick (View v) {//TODO auto-generated Method Stub//Set Start timing timech.setbase (Systemclock.elapsedrealtime ()); //Start TimerCh.start (); Start.setenabled (false);        }            }); Ch.setonchronometerticklistener (NewOnchronometerticklistener () {@Override Public voidOnchronometertick (chronometer chronometer) {//TODO auto-generated Method Stub//if it's more than 20s from timing to now,                if(Systemclock.elapsedrealtime ()-ch.getbase () >20*1000) {ch.stop (); Start.setenabled (true);    }            }                    }); }    }

In order to achieve this function, we should implement this function by monitoring the buttons and timers.

I think it's possible to change the function to create a edittext, enter the timekeeping time, and then stop the timer ...

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