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Eclipse Escape text when pasting into a string literal


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Window>Preference>Java>Editor>Typing and check the "Escape text when pasting into a string literal".

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341

Android Studio add library dependencies to module project | android-studio-add-library-dependencies-to-module-project



  1. File->Project Structure Ctrl + Alt + Shift + S


  2. Select module and Dependencies Tab


  3. Click on + PLUS button (right upper corner)


  4. Select library


  5. Click OK, OK





android/android-studio-add-library-into-project.png
146

Rotate a image bitmap picture Android example | rotate-a-image-bitmap-android-example


Rotate a bitmap Android source code.

public class MainActivity 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);
            
          // Bitmap b = Bitmap.createBitmap(200, 200, Bitmap.Config.ARGB_8888);
			
		    //  you need to insert a image flower_blue into res/drawable folder 
			Bitmap bmp = BitmapFactory.decodeResource(getResources(), R.drawable.flower_blue);
			 Matrix mat = new Matrix();
			                mat.postRotate(90);
			                Bitmap bmpRotate = Bitmap.createBitmap(bmp, 0, 0,
			  bmp.getWidth(), bmp.getHeight(),
			  mat, true);
		   int h = bmp.getHeight();
           
           canvas.drawBitmap(bmp, 10,10, paint);
           canvas.drawBitmap(bmpRotate, 10,10 + h + 10, paint);
           
		}

	}
}




android/rotate-image-android.png
114

Rename Android project package issue in Eclipse - R cannot be resolved to a variable | rename-android-project-package-issue-in-eclipse


Issue: After after renaming package this problem occurred "R cannot be resolved to a variable".

Solution: Try Clean your project Project » Clean » Clean projects selected below » select your project and click OK.

Try to delete the invalid code and type it again:

LinearLayout layout = (LinearLayout) findViewById(R.id.layout); // delete R.id.layout
LinearLayout layout = (LinearLayout) findViewById(); 
LinearLayout layout = (LinearLayout) findViewById(R.id.layout); // re-write this code R.id.layout
94

Is NaN isNaN isInfinite number value Java Android example | is-nan-isnan-java-example


float, double is NaN isNaN() isInfinite() Java Android example.

float f = 0.f;
boolean bIsNaN = Float.isNaN(f);
boolean bIsInfinite = Float.isInfinite(f);

 double d = Math.sqrt(-10);
 boolean b = Double.isNaN(d);

270

How to add or remove widgets home screen android 4 | how-to-add-or-remove-widgets-home-screen-android-4


Video tutorial
How to add or remove widgets home screen Android 4.