Shuffle List ArrayList Collections Java example

UNEXPECTED TOP-LEVEL EXCEPTION:
java.lang.IllegalArgumentException: already added: Lcz/okhelp/MyMathClass;

First try this solution!!!!!
Select your project in project tree and go to the Eclipse menu Project » Clean » Clean projects selected below » select your project and click OK.

If you create *.apk package with proguard sometimes you must back up the project, delete project, and create new project if you are unable to create *.apk file.

Check your AndroidManifest.xml if all Activity is correctly inserted. If you add a library project to Main project you have to insert Activity from library to Main project AndroidManifest.xml


Problem with the library.
I deleted library project from project tree and again put the _library project into the main project. This problem was resolved.
1.)Go to Project » Properties » Java Build Path » Libraries and remove (your projects) click OK.
2.)Go to Project » Clean » Clean projects selected below » select your project and click OK.
3.)Add again your LIBRARY project to your MAIN project Project » Properties » Java Build Path » Libraries.
See image below.

Problem with a *.apk file
If you create signed *.apk, you have to delete previous *.apk from your PC folder.

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);
             paint.setColor(Color.BLUE);
            
            Shader mShader = new LinearGradient(0, 0, 100, 70, new int[] {
                    Color.RED, Color.GREEN, Color.BLUE },
                    null, Shader.TileMode.MIRROR);  // CLAMP MIRROR REPEAT
            Canvas c = new Canvas(b);
            paint.setShader(mShader);
            //c.drawCircle(60, 60, 30, paint);
            c.drawRect(0, 0, 200, 200, paint);
            canvas.drawBitmap(b, 10,10, paint);
		}

	}
}

Solution:

public void alertMy(String sTitle, String sMessage){
	AlertDialog.Builder builder = new AlertDialog.Builder(Test.this); // activity
  builder.setTitle(sTitle)
  .setMessage(sMessage)
  .setCancelable(false)
  .setNegativeButton("Close",new DialogInterface.OnClickListener() {
      public void onClick(DialogInterface dialog, int id) {
          dialog.cancel();
      }
  });
  AlertDialog alert = builder.create();
  alert.show();

}

Multiple substitutions specified in non-positional format;did you mean to add the formatted="false" attribute?
Wiktionary, WiktionarySimple
location C:\documents\WiktionarySimple\res\values\strings.xml
Issue:

    <string name="template_user_agent">"%s/%s (Linux; Android)"</string>
    <string name="template_wotd_title">"Wiktionary:Word of the day/%s %s"</string>
    <string name="template_define_url">"//en.wiktionary.org/wiki/%s"</string>

Solution:

   <string name="template_user_agent" translatable="false">"%1$s/%2$s (Linux; Android)"</string>
    <string name="template_wotd_title">"Wiktionary:Word of the day/%1$s %2$s"</string>
    <string name="template_define_url" translatable="false">"//en.wiktionary.org/wiki/%s"</string>

Try reboot device.
Start device with start button on side of phone.
Screen will go to light black color.
Long press Start button for menu:
Power off
Reboot
Airplane mode

Reboot item is in same level like Start button.
Click on the screen - (Hear a click)
Now find OK button , it is under Reboot item on right side of screen.
Press OK (Hear a click)
Wait a moment.
If device to do nothing , try short press Start button (sreen will black)
and again to press Start button. If screen go to light black color,
try again find Reboot item as written above.