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Timer stopwatch based on Java Calendar class Android example


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Start Stop Stopwatch Timer Android example source code.


private static long mStartTime = 0L;
Calendar cal;
TextView hTextViewVypis = (TextView)findViewById(R.id.idTextVypis);

void start(){
            cal = Calendar.getInstance();
            mStartTime = cal.getTimeInMillis();
}

void stop(){
     prinOutStopWatchTime();
}


    private void prinOutStopWatchTime() {
    	final long start = mStartTime;
    	
    	cal = Calendar.getInstance();
    	long stopTime = cal.getTimeInMillis();
    	long millis = stopTime - start;
    	long milisekundy = millis % 1000;
    	int seconds = (int) (millis / 1000);
    	int minutes = seconds / 60;
    	seconds     = seconds % 60;
    	int hour = minutes / 60;
    	hour = hour % 60;
    	
    	if (seconds < 10) {
    		hTextViewVypis.setText(hour +  ":" + minutes + ":0" + seconds + ":" + milisekundy);
    	} else {
    		hTextViewVypis.setText(hour  +  ":" + minutes + ":" + seconds + ":" + milisekundy);            
    	}
    	
    }





397LW NO topic_id




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Další témata ....(Topics)


204

java.lang.NullPointerException: println needs a message | java-lang-nullpointerexception-println-needs-a-message


Problemi is in e.getMessage() what can return null and Log.e (String tag, String msg) will throws an new exception !!!!
Problem and solution:

      	try {
      		int [] i = {1};
      		int z = i[5];
      	} catch (ArrayIndexOutOfBoundsException e) {
      		String s = e.toString(); // s == java.lang.ArrayIndexOutOfBoundsException
                // try to testing String s for null value
      		if(s != null)
      		 Log.e("bla", s);
      		else 
      		 Log.e("bla", "My error text 1");
      		
      		String s2 = e.getMessage(); // s2 == null !!!!!!!
                // you need to testing String s2 for null value , or you get FATAL EXCEPTION: main
                // and application will be crashed
       		String s2 = e.getMessage(); // s2 == null !!!!!!!
      		if(s2 != null)
      		 Log.e("bla2", e.getMessage());
      		else 
      		 Log.e("bla2", "My error text 2");
     		
                // this is OK
      		e.printStackTrace();
      	}


LogCat:

E/bla(855): java.lang.ArrayIndexOutOfBoundsException

 E/bla2(855): My error text 2

 W/System.err(855): java.lang.ArrayIndexOutOfBoundsException
 W/System.err(855): 	at cz.okhelp.motion._MotionActivity.onTouchEvent(_MotionActivity.java:54)
 W/System.err(855): 	at android.app.Activity.dispatchTouchEvent(Activity.java:2099)
 W/System.err(855): 	at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1675)
 W/System.err(855): 	at android.view.ViewRoot.deliverPointerEvent(ViewRoot.java:2194)
 W/System.err(855): 	at android.view.ViewRoot.handleMessage(ViewRoot.java:1878)
 W/System.err(855): 	at android.os.Handler.dispatchMessage(Handler.java:99)
 W/System.err(855): 	at android.os.Looper.loop(Looper.java:123)
 W/System.err(855): 	at android.app.ActivityThread.main(ActivityThread.java:3683)
 W/System.err(855): 	at java.lang.reflect.Method.invokeNative(Native Method)
 W/System.err(855): 	at java.lang.reflect.Method.invoke(Method.java:507)
 W/System.err(855): 	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
 W/System.err(855): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
 W/System.err(855): 	at dalvik.system.NativeStart.main(Native Method)




Or you can using this code:

      	try {
      		int [] i = {1};
      		int z = i[5];
      	} catch (Exception e) {
      		
      		
      		StringBuilder sb = new  StringBuilder().append(e.getClass().getSimpleName()); 
          if  (e.getMessage() != null) { 
              sb.append("

"); sb.append(e.getMessage()); } Log.e("err", sb.toString()); // E/err(336): ArrayIndexOutOfBoundsException // this code write out all message Log.e("myError", "methodName", e); } // E/myError(371): methodName // E/myError(371): java.lang.ArrayIndexOutOfBoundsException // E/myError(371): at cz.okhelp.motion._MotionActivity.onTouchEvent(_MotionActivity.java:54) // E/myError(371): at android.app.Activity.dispatchTouchEvent(Activity.java:2099) // E/myError(371): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1675) // E/myError(371): at android.view.ViewRoot.deliverPointerEvent(ViewRoot.java:2194) // E/myError(371): at android.view.ViewRoot.handleMessage(ViewRoot.java:1878) // E/myError(371): at android.os.Handler.dispatchMessage(Handler.java:99) // E/myError(371): at android.os.Looper.loop(Looper.java:123) // E/myError(371): at android.app.ActivityThread.main(ActivityThread.java:3683) // E/myError(371): at java.lang.reflect.Method.invokeNative(Native Method) // E/myError(371): at java.lang.reflect.Method.invoke(Method.java:507) // E/myError(371): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) // E/myError(371): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) // E/myError(371): at dalvik.system.NativeStart.main(Native Method)

193

Samsung Galaxy S III - Android | samsung-galaxy-s-iii-android


Špičkový smartphone od Samsungu.

Technické parametry Samsung i9300 Galaxy S III
Rozměry a hmotnost: 137 x 71 x 9 mm, 133 gramů
Datové funkce: GPS modul, WiFi, Bluetooth, NFC, GPRS, EDGE, HSCSD, Hardwarový modem, Infraport
Sítě: pásma GSM 850, 900, 1 800, 1 900 MHz pásma WCDMA (3G) 850, 900, 1 900, 2 100 MHz
Displej: HD Super AMOLED diplej o velikosti 1280x720 4,8 palců
Procesor: čtyřjádrový procesor 1.4 GHz
Uživatelská paměť: 16 MB
paměť RAM 1 024 MB
Operační systém: Android 4.0 ICS
Hudba: MP3
Video: HD rozlišení
Fotoaparát: 8 Mpix
Navigace:
Baterie: Li-Pol, pohotovostní doba 390 hodin
Cena: cca 14.500 korun / léto 2012

Samsung i9300 Galaxy S III obrázek
samsung-i9300-galaxy-s-III
262

Font Family change on View dynamically Android Example | font-family-change-on-view-android-example


TypeFace, setTypeface, font, font family, array of String, Button create dynamically

@Override
protected void onStart() {
LinearLayout.LayoutParams p = new LinearLayout.LayoutParams(
  48,
  55
);	
Typeface typeFace = Typeface.MONOSPACE;	
String [] ar = {"A","B","C","D","E","F","G","H","J","K"};
for (int i = 0; i < ar.length; i++) {
Button buttonView = new Button(this);
buttonView.setText(Html.fromHtml("<b>"+ar[i]+"</b>"));
buttonView.setTextColor(Color.BLUE);
buttonView.setTextSize(27.f);
buttonView.setTypeface(typeFace,Typeface.BOLD);
buttonView.setOnClickListener(mThisButtonListener);
if(i%2==0)
	mLayoutButtons.addView(buttonView, p);
else
	mLayoutButtonsNextRow.addView(buttonView, p);
	
_listOfButtons.add(buttonView);
}

	super.onStart();
}

//////// xml file
<TextView
    android:id="@+id/text01"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textSize="20dp"
    android:fontFamily="Arial"
 />
100

How evaluate any expression in Eclipse debugger editor Android example | how-evaluate-any-expression-in-eclipse-debugger-editor-android-example


Tutorial by pictures how evaluate a variable in Eclipse debugger window.

1.) Open Debug perspective in Eclipse and to start debugging a Activity.
eclipse-debug-perspective


2.) Open Display window from menu Window->Show view->Display

eclipse dislplay window

3.) Set breakpoint where you need to evaluate a variable.

eclipse-toggle-breakpoint

4.) Debug the Activity to breakpoint.

eclipse-debugger-breakpoint


5.) Into the Display window type code for evaluate your variable and execute code.

eclipse-type-evaluate-code-to-display-window


6.) Check if change of value a variable

eclipse-evaluate-a-variable

4

Read file from URL | read-file-from-url


Read file from URL to array of byte and convert to UTF-8 String Android examle source code.

URL urlLoc = new URL("//myweb.com/myfile.html");
URLConnection conexion = urlLoc.openConnection();
conexion.setConnectTimeout(4000);
conexion.setReadTimeout(1000);
conexion.connect();

// downlod the file
InputStream input = new BufferedInputStream(urlLoc
		.openStream());

StringBuffer responseBuffer = new StringBuffer();
byte[] byteArray = new byte[1024];
while (input.read(byteArray) != -1)
 {   
        String res = new String(byteArray, "UTF-8");
        responseBuffer.append(res);
        byteArray = null;
        byteArray = new byte[1024];
 }

String response = responseBuffer.toString().trim();





Editace: 2011-09-26 14:48:31
Počet článků v kategorii: 397
Url:timer-stopwatch-java-calendar-android-example

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