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Compressing converting a bitmap to PNG format Android example


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public class MainActivity extends Activity {
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(new SampleView(this));
	}

	private static Bitmap codec(Bitmap src, Bitmap.CompressFormat format,
			int quality) {
		ByteArrayOutputStream os = new ByteArrayOutputStream();
		src.compress(format, quality, os);

		byte[] array = os.toByteArray();
		return BitmapFactory.decodeByteArray(array, 0, array.length);
	}

	private static class SampleView extends View {

		// CONSTRUCTOR
		public SampleView(Context context) {
			super(context);
			setFocusable(true);

		}
		@Override
		protected void onDraw(Canvas canvas) {
			Paint paint = new Paint();
			
			canvas.drawColor(Color.YELLOW);
            
        
			Bitmap bmp = BitmapFactory.decodeResource(getResources(), R.drawable.flower_blue);
             
			Bitmap bPNGcompress = codec(bmp, Bitmap.CompressFormat.PNG, 0);

		   int h = bmp.getHeight();
           
           canvas.drawBitmap(bmp, 10,10, paint);
           canvas.drawBitmap(bPNGcompress, 10,10 + h + 10, paint);
           
		}

	}
}


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Locale location Java Android example | locale-location-java-android-example



Locale lc = Locale.getDefault(); // default now locale on device
	String sCountry = lc.getCountry(); // CZ
	
	lc = new Locale("fr","FR"); //FRANCE .. Locale(language, country);
	String sCountry2 = lc.getDisplayCountry(); // Francie

	 Locale locale = Locale.GERMAN;					    
	 String sCountry3 = locale.getDisplayCountry(); // ""

 Locale locale = Locale.GERMAN;
 DateFormat formatter = new SimpleDateFormat("HH:mm:ss zzzz", locale);
 String s = formatter.format(new Date());//13:40:39 GMT+00:00					


// array of locales   
 Locale[] locales = { new Locale("fr", "FR"), new Locale("de", "DE"),
				        new Locale("en", "US") };


Locale locale = Locale.US;

// for date
DateFormat dateFormatterEurope = DateFormat.getDateInstance(DateFormat.DEFAULT,
					Locale.GERMANY);
Calendar myCalendar = Calendar.getInstance();
String sDate = dateFormatterEurope.format(myCalendar.getTime());

        final byte[] langBytes = locale.getLanguage().getBytes(Charsets.US_ASCII);
        
// UTF-8 most widely used text format for to properly display of text
        final Charset utfEncoding = Charsets.UTF_8;
        String text = "ěščřžýáíéůú"; 
        final byte[] textBytes = text.getBytes(utfEncoding);


// other Locale
CANADA
CANADA_FRENCH
CHINA
CHINESE
ENGLISH
FRANCE
FRENCH
GERMAN
GERMANY
ITALIAN
ITALY
JAPAN
JAPANESE
KOREA
KOREAN
PRC // Locale constant for zh_CN. 
ROOT // Locale constant for the root locale. 
SIMPLIFIED_CHINESE
TAIWAN
TRADITIONAL_CHINESE Locale constant for zh_TW. 
UK
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Save Instance State if device is rotated | save-instance-state-if-device-is-rotated


Try this trick.
In AndroidManifest - activity tag write this code
android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize"
App hold data of a views if will to rotation of device.


       <activity
 android:name=".Tests_Activity"
 android:label="@string/app_name"
 android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize" />
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Open Close Hide Project in Eclipse - save memory | close-hide-project-in-eclipse-save-memory


Close one project:¨
-right click on project
- select Close project

Close more projects:
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Hide closed projects:
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eclipse-close-project

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97

How going life cycle if screen orientation changed Android example | how-going-life-cycle-if-screen-orientation-changed-android-example


onSaveInstanceState, onRestoreInstanceState life cycle if screen orientation changed from log file.

// starts activity
15:27:12.801: INFO/onCreate(1828): onCreate()
15:27:12.811: INFO/onStart(1828): onStart()
15:27:12.821: INFO/onResume(1828): onResume()
// activity is running 

15:27:33.651: DEBUG/dalvikvm(307): GC_EXPLICIT freed 186K, 53% 
free 2770K/5831K, external 981K/1038K, paused 99ms

// change emulator state Ctrl+F11 landscape, portrait
15:27:40.427: INFO/ActivityManager(74): Config changed: 
{ scale=1.0 imsi=310/260 loc=en_US touch=3 keys=2/1/2 nav=3/1 orien=2 layout=18 uiMode=17 seq=64}

// saved all variable values if need
15:27:40.581: INFO/onSaveInstanceState(1828): onSaveInstanceState()

15:27:40.602: INFO/onPause(1828): onPause()
15:27:40.612: INFO/onStop(1828): onStop()
15:27:40.631: INFO/onDestroy(1828): onDestroy()

// activity goes back to onCreate !!!!!!!!!
15:27:40.692: INFO/onCreate(1828): onCreate()
15:27:40.701: INFO/onStart(1828): onStart()

// restore all saved values of variables 
15:27:40.711: INFO/onRestoreInstanceState(1828): onRestoreInstanceState()
// you can using saved values by onSaveInstanceState() in onResume
15:27:40.721: INFO/onResume(1828): onResume()




Diagram of life cycle onSaveInstanceState, onRestoreInstanceState

[caption id="attachment_1169" align="alignleft" width="229" caption="Life cycle onRestoreInstanceState"]life_cycle_onRestoreInstanceState[/caption]
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While cycle loop in Java example | while-cycle-loop-in-java-example


While cycle Java basic example with array of strings.

MainClass.java

public class MainClass {
	public static void main(String[] arg) {
		String[] arrayOfString = { "Hello", "people", "hello", "world!" };
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		while ( i < arrayOfString.length ){
			System.out.println(arrayOfString[i]);
			i++;
		}
	}
}


Editace: 2013-12-09 13:09:31
Počet článků v kategorii: 397
Url:compressing-converting-a-bitmap-to-png-format-android-example

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