Timer task TimerTask run cancel Android example
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Update TextView from TimerTask, Handler, schedule, run, cancel TimerTask, Android example
public class TimerActivity extends Activity {
TimerTask mTimerTask;
final Handler handler = new Handler();
Timer t = new Timer();
TextView hTextView;
TableRow hTableRow;
Button hButton, hButtonStop;
private int nCounter = 0;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
hTextView = (TextView)findViewById(R.id.idTextView);
hButton = (Button)findViewById(R.id.idButton);
hButton.setOnClickListener(mButtonStartListener);
hButtonStop = (Button)findViewById(R.id.idButtonStop);
hButtonStop.setOnClickListener(mButtonStopListener);
} // end onCreate
View.OnClickListener mButtonStartListener = new OnClickListener() {
public void onClick(View v) {
doTimerTask();
}
};
View.OnClickListener mButtonStopListener = new OnClickListener() {
public void onClick(View v) {
stopTask();
}
};
public void doTimerTask(){
mTimerTask = new TimerTask() {
public void run() {
handler.post(new Runnable() {
public void run() {
nCounter++;
// update TextView
hTextView.setText("Timer: " + nCounter);
Log.d("TIMER", "TimerTask run");
}
});
}};
// public void schedule (TimerTask task, long delay, long period)
t.schedule(mTimerTask, 500, 3000); //
}
public void stopTask(){
if(mTimerTask!=null){
hTextView.setText("Timer canceled: " + nCounter);
Log.d("TIMER", "timer canceled");
mTimerTask.cancel();
}
}
}
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The source attachment does not contain the source for the file TextWatcher.class.
You can change the source attachment by clicking Change Attached Source below:
You have to add JDK src.zip path to dialog as on image below.
[caption id="attachment_1091" align="alignleft" width="282" caption="class file editor source not found Eclipse warning"]
[/caption]
Or go to Project > Properties > Java Build Path > Libraries
Expand JRE System Library. Expand rt.jar.
Select Source attachment and double click or Edit.
Type path the source code file (External File…) and press OK.
[caption id="attachment_1094" align="alignleft" width="300" caption="Java project build path"]
[/caption]
[caption id="attachment_1105" align="alignleft" width="300" caption="Java JRE deifiniton path in Eclipse"]
[/caption]
Now if mouse move about keywords String or F3 on keywords and press button in yellow field will opened String.class
You can change the source attachment by clicking Change Attached Source below:
You have to add JDK src.zip path to dialog as on image below.
[caption id="attachment_1091" align="alignleft" width="282" caption="class file editor source not found Eclipse warning"]

Or go to Project > Properties > Java Build Path > Libraries
Expand JRE System Library. Expand rt.jar.
Select Source attachment and double click or Edit.
Type path the source code file (External File…) and press OK.
[caption id="attachment_1094" align="alignleft" width="300" caption="Java project build path"]

Or type path in Java JRE definition
[caption id="attachment_1105" align="alignleft" width="300" caption="Java JRE deifiniton path in Eclipse"]

How open String.class or others keywords definition with Eclipse.
Now if mouse move about keywords String or F3 on keywords and press button in yellow field will opened String.class


Admob testing on emulator issue.
Android Eclipse code warning:
setTesting(boolean) from the type AdRequest is deprecated
Solution:
adRequest.addTestDevice(AdRequest.TEST_EMULATOR);
Android Eclipse code warning:
setTesting(boolean) from the type AdRequest is deprecated
Solution:
adRequest.addTestDevice(AdRequest.TEST_EMULATOR);
AdView adView = new AdView(this, AdSize.BANNER, "a14d9..........");//MY_AD_UNIT_ID
AdRequest adRequest = new AdRequest();
adRequest.setTesting(true); // deprecated
adRequest.addTestDevice(AdRequest.TEST_EMULATOR); // OK
adView.loadAd(adRequest);
Android development
long is 64 bit signed type and used when int is not large enough to hold the value.
long je celé číslo 64 bitů -9223372036854775808 +9223372036854775807 a používá se tam, kde typ int není schopen pojmout takovou hodnotu čísla.
long is 64 bit signed type and used when int is not large enough to hold the value.
long je celé číslo 64 bitů -9223372036854775808 +9223372036854775807 a používá se tam, kde typ int není schopen pojmout takovou hodnotu čísla.
// declaration and assignment of value type long
long n = 22337203685477580L;
// print formated value
System.out.printf("The value of x is %d%n", n); // 22337203685477580
System.out.format("%+,8d%n%n", n); // +22 337 203 685 477 580
// declaring more variables in single statement
long lo1 = 12L, lo2 = 56, lo3 = 1455555555589L;
// long range of value
System.out.println(Long.MAX_VALUE); // 9223372036854775807
System.out.println(Long.MIN_VALUE); // -9223372036854775808
// check if a string is a valid number in Java example
// convert string to long Java example
String sLong = "1288888888888888";
long longParse = Long.parseLong(sLong);
// convert strings to numbers
long longFromString = (Long.valueOf(sLong)).longValue();
// long to string in Java example code
Long longObj = new Long(229999999999L);
String str = longObj.toString();
// else
Long longS = 888888888888L;
String strLong = longS.toString();
// compare two long variables
Long longComp1 = 5555L;
if (longComp1.equals(55555555L))
System.out.print("true");
// compares the two specified long values in Java example
int i = longS.compareTo(444444L); // -1 first < second
// 0 first == second
// 1 first > second
System.out.print(i);
- download any mobile styles for example //www.artodia.com/phpbb-styles/mobile/
- unzip style into your forum style folder for example all art_mobile folder copy into 0:/myweb/forum/styles/
- folow instalation istructions //www.artodia.com/phpbb-styles/mobile/tutorials/mobile-detection/
- check url result on https://www.google.com/webmasters/tools/mobile-friendly
- unzip style into your forum style folder for example all art_mobile folder copy into 0:/myweb/forum/styles/
- folow instalation istructions //www.artodia.com/phpbb-styles/mobile/tutorials/mobile-detection/
- check url result on https://www.google.com/webmasters/tools/mobile-friendly
Click Handler Android Java example source code. Open new class as activity and open URL in browser.
In layout.xml file:
In string.xml
In MainClass.java file
In layout.xml file:
android:layout_height="wrap_content" android:onClick="@string/clickHandler">
In string.xml
myClickHandler
In MainClass.java file
public void myClickHandler(View view) {
switch (view.getId()) {
// open new class as activity
case R.id.btnOpenClass: {
Intent pictureActivity = new Intent(getBaseContext(),
MyClass.class);
startActivity(pictureActivity);
}
break;
case R.id.btnAbout: {
//aboutDialogCreate();
}
break;
// open url
case R.id.btnHome: {
String url = "//android.okhelp.cz/";
Intent i = new Intent(Intent.ACTION_VIEW);
i.setData(Uri.parse(url));
startActivity(i);
}break;
}
}// end myClickHandler
// listener .. if click on button will scrolling to mTextView bottom
private OnClickListener mButtonListener = new OnClickListener() {
public void onClick(View v) {
// do something when the button is clicked
int nBottom = mTextView.getBottom();
hScrollView.scrollTo(0, nBottom);
}
};
Editace: 2011-10-03 13:57:17
Počet článků v kategorii: 397
Url:timer-task-timertask-run-cancel-android-example
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