Foreach loop cycle in Java Android example

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Foreach in Java basic example source code.

MainClass.java



public class MainClass {
	public static void main(String[] arg) {
		String[] arrayOfString = { "Hello", "people", "hello", "world!" };

		for (String s : arrayOfString)
			System.out.println(s);

	}
}

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Další témata ....(Topics)

219

SparseArray instead HashMap Android example | sparsearray-instead-hashmap-android-example

Old code with HashMap


 Map<Integer, Bitmap> _bitmapCache = new HashMap<Integer, Bitmap>();
   private void fillBitmapCache() {
        _bitmapCache.put(R.drawable.icon, BitmapFactory.decodeResource(getResources(), R.drawable.icon));
        _bitmapCache.put(R.drawable.abstrakt, BitmapFactory.decodeResource(getResources(), R.drawable.abstrakt));
        _bitmapCache.put(R.drawable.wallpaper, BitmapFactory.decodeResource(getResources(), R.drawable.wallpaper));
        _bitmapCache.put(R.drawable.scissors, BitmapFactory.decodeResource(getResources(), 
    }

Bitmap bm = _bitmapCache.get(R.drawable.icon);

Lint warning:
Use new SparseArray(...) instead for better performance
Issue: Looks for opportunities to replace HashMaps with the more efficient SparseArray
Id: UseSparseArrays

New code with SparseArray


 SparseArray<Bitmap> _bitmapCache = new SparseArray<Bitmap>();
   private void fillBitmapCache() {
        _bitmapCache.put(R.drawable.icon, BitmapFactory.decodeResource(getResources(), R.drawable.icon));
        _bitmapCache.put(R.drawable.abstrakt, BitmapFactory.decodeResource(getResources(), R.drawable.abstrakt));
        _bitmapCache.put(R.drawable.wallpaper, BitmapFactory.decodeResource(getResources(), R.drawable.wallpaper));
        _bitmapCache.put(R.drawable.scissors, BitmapFactory.decodeResource(getResources(), 
    }

Bitmap bm = _bitmapCache.get(R.drawable.icon);

SparseArray methods:
//developer.android.com/reference/android/util/SparseArray.html

120

Statistics usability of mobile phones with Android – October 2011 | statistics-usability-of-mobile-phones-with-android-%e2%80%93-october-2011

Table of usability phones with Android: (Our software)

October 2011

September 2011

Samsung Galaxy S2	10,90%
Samsung Galaxy S	8,10%
Samsung Galaxy Tab	7,00%
Samsung Galaxy Mini	6,20%
HTC Desire HD	4,10%
Samsung Galaxy Ace	4,10%
Samsung Galaxy S	4,00%
Samsung Galaxy Fit	3,30%
HTC Wildfire	3,20%
SEMC Xperia X10	2,20%

Samsung Galaxy S2	13.8%
Samsung Galaxy S	8.5%
Samsung Galaxy Tab	7.4%
Samsung Galaxy Mini	5.4%
Samsung Galaxy S	4.0%
HTC Desire HD	3.8%
Samsung Galaxy Ace	3.8%
HTC Wildfire	3.2%
Samsung Galaxy Fit	3.1%
SEMC Xperia X10	2.1%

Graph of usability Smartphone with Android - October 2011:
phones-usability-wiht-android-october-2011

Samsung Galaxy S2 vs iPhone4 - video

Samsung Galaxy S2 vs iPhone4 - browsing, gaming, apps, performance, browser, fast, against, navigation, Sygic, apk, Android, iOS

Change background color dynamically View TableRow setBackgroundColor Android example | change-background-color-dynamically-view-tablerow-android-example

How change background color of View Android sample.

MainActivity.java


public class MainActivity extends Activity {
TextView hTextView;
TableRow hTableRow;
Button hButton, hButtonStop;
private Handler mHandler = new Handler();
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);
        hTableRow = (TableRow)findViewById(R.id.idTableRow1);


        
        
    } // end onCreate

 View.OnClickListener mButtonStartListener = new OnClickListener() {
	public void onClick(View v) {
           hTableRow.setBackgroundColor(Color.YELLOW);
	}
 };
}

main.xml


<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="//schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >


<TableLayout android:layout_height="wrap_content" android:layout_width="fill_parent" android:id="@+id/tableLayout1">
    <TableRow android:id="@+id/idTableRow1" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" android:background="#5655AA">
<TextView  
	android:id="@+id/idTextView"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    />
    
    </TableRow>
</TableLayout>
</LinearLayout>

Get package name Context-getPackageName Android example | get-package-name-context-getpackagename-android-example

If you often copy your Android project to another you have to using function for obtaining varied information about package.
This code show how get package name in Android application as string:


Context context = getContext(); // this.getContext(); getApplicationContext(); etc.
String sPackName = context.getPackageName();

The Labeled continue statement Java example | the-labeled-continue-statement-java-example

The Labeled continue statement as goto Java example.


public class MainClass {
	public static void main(String[] arg) {
		String[] arrayOfString = { "Hello", "people", "hello", "world!" };
		OuterLoop: for (int e = 0; e < 4; e++) {
			for (int i = 0; i < arrayOfString.length; i++) {
				if (arrayOfString[i].equals("hello"))
					continue OuterLoop;
				System.out.println(arrayOfString[i]);
			}
		}
	}
}
/*
Hello
people
Hello
people
Hello
people
Hello
people
*/

Editace: 2011-10-04 08:56:58
Počet článků v kategorii: 397
Url:foreach-loop-cycle-in-java-android-example

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