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int java android example


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int occupy 4 bytes (32 bits) in memory

int in Java example of using Integer and Array of Integer and Iteger to String

        // get max end min values of int in Java example 4 bytes (32 bits) PC architecture
	System.out.println(Integer.MAX_VALUE); // 2147483647
	System.out.println(Integer.MIN_VALUE); // -2147483648


// members variable
private int mProgress = 10;

//integer to string java
int myInteger = 8;
String myString = Integer.toString(myInteger);

// a final variable can only be initialized once
static final int NUM_PARTICLES = 15;

 for (int i = 0; i < NUM_PARTICLES ; i++) { 
// do something
}

// int as return value of function
public int getCount() {
return 5;
}

// int as a parametr of function
public float getFloatFromInt(int i) {
float fRet = (float) i;
 return fRet;
}

//array of int
int[] anArray;              // declares an array of integers
          anArray = new int[2];      // allocates memory for 2 integers
          anArray[0] = 100; // initialize first element
          anArray[1] = 200; // initialize second element

for (int i = 0; i < anArray.length; i++) {
// print out values from anArray
System.out.println("Index: " + i);
System.out.println("Value: " + anArray[i]); 
}



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Create bitmap and draw text into bitmap Android example | create-bitmap-and-draw-text-into-bitmap-android-example



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

	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.GREEN);
            
           Bitmap b = Bitmap.createBitmap(200, 200, Bitmap.Config.ALPHA_8);
           Canvas c = new Canvas(b);
           c.drawRect(0, 0, 200, 200, paint);
           
           paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC));
           paint.setTextSize(40);
           paint.setTextScaleX(1.f);
           paint.setAlpha(0);
           paint.setAntiAlias(true);
           c.drawText("Your text", 30, 40, paint);
           paint.setColor(Color.RED);
           
           canvas.drawBitmap(b, 10,10, paint);
		}

	}
}


draw-text-into-bitmap-android

364

Center View in RelativeLayout Android | center-view-in-relativelayout-android


RelativeLayout like parent, child Srollview is centered horizontal.
Second RelativeLayout in SrollView have gravity center, every child will centered horizontally and vertically.


<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="//schemas.android.com/apk/res/android"
    android:layout_width="match_parent" android:layout_height="match_parent"
    android:gravity="center_horizontal">

    <ScrollView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/scrollView2" >

        <RelativeLayout
            android:layout_width="320dp"
            android:layout_height="wrap_content"
            android:background="#e6f825"
            android:gravity="center">

            <Button
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
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    </ScrollView>

</RelativeLayout>
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Activity Lifecycle if button Home pressed Android example | activity-lifecycle-if-button-home-pressed-android-example


If on Android emulator home button pressed.

// button home presssed
19:37:06.727: INFO/ActivityManager(60): Starting: 
Intent { act=android.intent.action.MAIN cat=[android.intent.category.HOME] 
flg=0x10200000 cmp=com.android.launcher/com.android.launcher2.Launcher } from pid 60

19:37:06.807: INFO/onSaveInstanceState(339): onSaveInstanceState()
19:37:06.848: INFO/onPause(339): onPause()
19:37:07.968: INFO/onStop(339): onStop()


Diagram of Activity lifecycle if button HOME pressed

life_cycle_button_home_pressed
276

Create Image From View Screen Android | create-image-from-view-screen-android



WebView_webview = (WebView)findViewById(R.id.webViewMapa);
_webview.getSettings().setBuiltInZoomControls(true);
_webview.setBackgroundColor(Color.parseColor("#E8EAE8"));
// _webview.loadUrl( ... some your page

Bitmap b = Bitmap.createBitmap(_webview.getWidth()/2, _webview.getHeight(), Bitmap.Config.ARGB_8888);
// you can to draw on bitmap
Canvas c = new Canvas(b);
Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
paint.setStrokeWidth(15.f);
paint.setColor(Color.RED);
paint.setStyle(Paint.Style.STROKE);
//paint.setShadowLayer(5.f, 0, 5.f, 0xFF000000);
_webview.draw(c); // put into canvas content of view like image
c.drawLine(70, 0, 150, 350, paint);// draw some line
//Rect oval = new Rect(0, 0, 100, 100);
//c.drawArc(oval, 0, 180, false, paint);

// you can show bitmap in other view
((ImageView)findViewById(R.id.imageView1)).setImageBitmap(b);



Editace: 2011-09-26 20:51:00
Počet článků v kategorii: 397
Url:int-java-android-example

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