Usage of the timer (Chronometer) and the timer chronometer

Usage of the timer (Chronometer) and the timer chronometer

Android provides a timer component: Chronometer, Which is extends TextView. Therefore, a piece of text is displayed, but the display time is from the start time, it only provides the android: format attribute for specifying the counting format of the timer.

Chronometer is easy to use. It supports the following usage:

GetBase (): return time.

SetBase (long base): Set the start time of the timer.

Start (): start timing.

Stop (): stop timing.

SetFormat (String format): Set the display time format.

SetOnChronometerTickListener (Chronometer. OnChronometerTickListener listener): binds a listener event to the timer.

 

The following program designs a one-minute timer.

First:Define a Chronomete and Button component in the XML file:

<? Xml version = "1.0" encoding = "UTF-8"?> <LinearLayout xmlns: android = "http://schemas.android.com/apk/res/android" android: orientation = "vertical" android: layout_width = "match_parent" android: layout_height = "match_parent"> <Chronometer android: layout_width = "wrap_content" android: layout_height = "wrap_content" android: id = "@ + id/chronometer" android: textColor = "# ff0303" android: textSize = "12pt" android: layout_gravity = "center_horizontal" android: focusable = "true"/> <Button android: layout_width = "wrap_content" android: layout_height = "wrap_content" android: text = "start" android: id = "@ + id/button" android: layout_gravity = "center_horizontal"/> </LinearLayout>

Second:Use the setOnChronometerTickListener (Chronometer. OnChronometerTickListener listener) function to bind a listener event to the timer. The program defines a Chronometer component and a Button component. When you click a Button, the timer starts. The timer time is one minute.

Package happy. chronometer; import android. OS. bundle; import android. OS. systemClock; import android. support. design. widget. floatingActionButton; import android. support. design. widget. snackbar; import android. support. v7.app. appCompatActivity; import android. support. v7.widget. toolbar; import android. view. view; import android. view. menu; import android. view. menuItem; import android. widget. button; import android. widget. chronometer; public class MainActivity extends AppCompatActivity {Chronometer ch; Button start; @ Override protected void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. test); // obtain the timer component ch = (Chronometer) findViewById (R. id. chronometer); // obtain the start component start = (Button) findViewById (R. id. button); start. setOnClickListener (new View. onClickListener () {@ Override public void onClick (View v) {// set the start time ch. setBase (SystemClock. elapsedRealtime (); // start the timer ch. start () ;}}); // bind the listener event ch to the timer. setOnChronometerTickListener (new Chronometer. onChronometerTickListener () {@ Override public void onChronometerTick (Chronometer ch) {// if it has exceeded 60 s since the start of the timer if (SystemClock. elapsedRealtime ()-ch. getBase ()> 60*1000) {ch. stop (); start. setEnabled (true );}}});}}

 Finally:We can see the above effect, in which time is the time that has elapsed.