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Resize a bitmap image Android example


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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.YELLOW);
            
	         
	         paint.setFilterBitmap(true);
	         Bitmap bitmapOrg = BitmapFactory.decodeResource(getResources(),R.drawable.flower_blue);
	         int targetWidth  = bitmapOrg.getWidth() * 2;
	         int targetHeight = bitmapOrg.getHeight() * 2;
	         Bitmap bmp = Bitmap.createBitmap(targetWidth, targetHeight,Bitmap.Config.ARGB_8888);
	         RectF rectf = new RectF(0, 0, targetWidth, targetHeight);
	         Canvas c = new Canvas(bmp);
	         Path path = new Path();
	         path.addRect(rectf, Path.Direction.CW);
	         c.clipPath(path);
	         c.drawBitmap( bitmapOrg, new Rect(0, 0, bitmapOrg.getWidth(), bitmapOrg.getHeight()),
	                         new Rect(0, 0, targetWidth, targetHeight), paint);
	         Matrix matrix = new Matrix();
	         matrix.postScale(1f, 1f);
	         Bitmap resizedBitmap = Bitmap.createBitmap(bmp, 0, 0, targetWidth, targetHeight, matrix, true);
	         int h = bitmapOrg.getHeight();
           canvas.drawBitmap(bitmapOrg, 10,10, paint);
           canvas.drawBitmap(resizedBitmap, 10,10 + h + 10, paint);
           
		}

	}
}


resize bitmap android

397LW NO topic_id




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Další témata ....(Topics)


139

drawBitmap createBitmap by array of colours Android example | drawbitmap-createbitmap-draw-bitmap-by-array-of-colours-android-example


public static Bitmap createBitmap (int[] colors, int offset, int stride, int width, int height, Bitmap.Config config)
public void drawBitmap (Bitmap bitmap, float left, float top, Paint paint)

//  //www.apache.org/licenses/LICENSE-2.0
public class MainActivity extends Activity {
	    private static final int WIDTH = 50;
	    private static final int HEIGHT = 50;
	    private static final int STRIDE = 64;   // must be >= WIDTH
	    
	    private static int[] createColors() {
	        int[] colors = new int[STRIDE * HEIGHT];
	        for (int y = 0; y < HEIGHT; y++) {
	            for (int x = 0; x < WIDTH; x++) {
	                int r = x * 255 / (WIDTH - 1);
	                int g = y * 255 / (HEIGHT - 1);
	                int b = 255 - Math.min(r, g);
	                int a = Math.max(r, g);
	                colors[y * STRIDE + x] = (a << 24) | (r << 16) | (g << 8) | b;
	            }
	        }
	        return colors;
	    }
	
	@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);

            int[] mColors = createColors();
            int[] colors = mColors;

           
            Bitmap bitmap = Bitmap.createBitmap(colors, 0, STRIDE, WIDTH, HEIGHT,
                    Bitmap.Config.RGB_565);
                      
			canvas.drawBitmap(bitmap, 50,20, paint); 
		}

	}
}


257

Two boolean as one parameter value in function Java | two-boolean-as-one-parameter-value-in-function-java



boolean fc(boolean b) {
	return b;
}// end fc
		boolean bA = true;
		boolean bB = true;
		boolean bC = bA || bB; // true

		bA = true;
		bB = false;
		bC = bA || bB; // true

		bA = false;
		bB = true;
		bC = bA || bB; // true

		bA = false;
		bB = false;
		bC = bA || bB; // false
		
			if(!fc(bB||bA))
			System.out.println("false"); // false
                        else 
			System.out.println("true"); 


228

Eclipse "id cannot be resolved or is not a field” error Android | eclipse-id-cannot-be-resolved-or-is-not-a-field-error-android


"id cannot be resolved or is not a field” error
If you copy project to workspace or some code from other project you can get this error.

Try remove or add import your R file:

import com.example.app.R


Check xml files.
Clean project by menu Project-Clean

Maybe you have to create new project end copy old source files to new project folders.
272

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:
- right click on project
- select Close Unrelated Projects

Hide closed projects:
- package explorer
- view menu
- select Closed projects

eclipse-close-project

eclipse-close-projects

eclipse-open-projec
18

long in java example | long-in-java-example


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.


		// 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);


Editace: 2013-12-09 13:09:20
Počet článků v kategorii: 397
Url:resize-a-bitmap-image-android-example

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