Okhelp.cz

Recepty, články, nápady, programování. Dříve dum-zahrada, finance, internet a know-how.okhelp.cz Pro lepší výsledky hledání používejte i diakritiku.

Error type 3 Activity class does not exist


AD MOB

Try some solution - each individually or all

  1. Check AndroidManifest.xml activity declaration
    <activity
                android:name=".EnableProfileActivity"
                android:label="@string/app_name" />


  2. Delete BUILD folder in module tree and Clean / Rebuild project

  3. Restart Android Studio


397LW NO topic_id




AD

Další témata ....(Topics)


353

Android Fragment onAttach deprecated | android-fragment-onattach-deprecated



// Context instead Activity as a parameter
@Override
public void onAttach(Context context) {
    super.onAttach(context);

    Activity a;

    if (context instanceof Activity){
        a=(Activity) context;
    }

}

OnNoteClickedListener listener;
/* old emxample of usage
	@Override
	public void onAttach(Activity activity) {
		super.onAttach(activity);
		try {
			listener = (OnNoteClickedListener) activity;
		} catch (ClassCastException e) {
			throw new ClassCastException(activity.toString()
					+ " must implement OnNoteClickedListener");
		}
	}
*/
// new version of code
	@Override
	public void onAttach(Context context) {
		super.onAttach(context);

		Activity a;

		if (context instanceof Activity){
			a=(Activity) context;
			try {
				listener = (OnNoteClickedListener) a;
			} catch (ClassCastException e) {
				throw new ClassCastException(a.toString()
						+ " must implement OnNoteClickedListener");
			}
		}

	}


3

Download file from URL | download-file-from-url


Download image file from URL to ImageView Java Android source example code.



Context context = thisClass.this;
Drawable image = ImageOperations(context,
"//www.okhelp.cz/images/android/ad_4.png"
,"image.jpg");
ImageView imgView;
imgView = (ImageView)findViewById(R.id.idImageView);
imgView.setImageDrawable(image);

	private Drawable ImageOperations(Context ctx, String url, String saveFilename) {
		try {
			InputStream is = (InputStream) this.fetch(url);
			Drawable d = Drawable.createFromStream(is, "src");
			return d;
		} catch (MalformedURLException e) {
			e.printStackTrace();
			return null;
		} catch (IOException e) {
			e.printStackTrace();
			return null;
		}
	}

	public Object fetch(String address) throws MalformedURLException,IOException {
		URL url = new URL(address);
		Object content = url.getContent();
		return content;
	}
37

LayoutLib is too recent. Update your tool Eclipse Android | layoutlib-is-too-recent-update-your-tool-eclipse-android


LayoutLib is too recent. Update your tool!
Eclipse Android Graphical layout resolving problem.


  1. Open in Eclipse menu Help ->Check for Updates

  2. Select updates: [caption id="attachment_593" width="300" caption="Android Eclipse updates dialog"]android-eclipse-updates[/caption]


  3. Press Next and update all


  4. Restart Eclipse


  5. [caption id="attachment_596" align="alignleft" width="300" caption="Restart Eclipse if updates finished."]layoutlib-is-too-recent-update-your-tool[/caption]






137

Draw drawARGB() Android basic example | draw-drawargb-android-basic-example



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) {
			//drawARGB (int a, int r, int g, int b)
//			a  alpha component (0..255) of the color to draw onto the canvas 
//			r  red component (0..255) 
//			g  green component (0..255)  
//			b  blue component (0..255)  

			canvas.drawARGB(255, 0, 255, 10); 
		}

	}
}


286

Eclipse - Workspace in use or cannot be created chose a different one | eclipse-workspace-in-use-or-cannot-be-created-chose-a-different-one


Open your workspace folder and subfolder .metadata:
C:\Users\workspace\.metadata\

Delete .lock file


Editace: 2017-03-11 11:34:08
Počet článků v kategorii: 397
Url:error-type-3-activity-class-does-not-exist

AD
11 Share
Share
Tweet