Rename Android project package issue in Eclipse - R cannot be resolved to a variable

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

396LW NO topic_id

Další témata ....(Topics)

159

Array copy to Array Java Android example | array-copy-to-array-java-android-example


    String[] source = {"Hello","world","by","Android"};
    
    String[] destination = new String[source.length];
   
    System.arraycopy(source, 0, destination, 0, source.length);

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.

Open in Eclipse menu Help ->Check for Updates

Select updates:

Press Next and update all

Restart Eclipse

android/layoutlib-is-too-recent-update-your-tool-300x221.png

380

Android Fragment Examples | android-fragment-examples

Code look up at the Api Demos

android_fragments arguments attributes - three fragments on screen
android/android_fragments_arguments.png

android_fragments_alert_dialog
android/android_fragments_alert_dialog.png

android_fragments_context_menu
android/android_fragments_context_menu.png

android_fragments_custom_animation
android/android_fragments_custom_animation.png

android_fragments_dialog
android/android_fragments_dialog.png

android_fragments_dialog_or_activity
android/android_fragments_dialog_or_activity.png

fragment_hide_show
android/fragment_hide_show.png

fragment_layout
android/fragment_dialog.png

fragments_list_array
android/fragments_list_array.png

fragment_menu
android/fragment_menu.png

android_fragments_get_result_from_fragment and tabs in two rows
android/android_fragments_get_result_from_fragment.png

android_fragments_recive_result
android/android_fragments_recive_result.png

android_fragments_stack
android/android_fragments_stack.png

fragment_tabs
android/fragment_tabs.png

105

How to make a horizontal line in Android application example code | how-to-make-a-horizontal-line-in-android-application-example-code

In html is horizontal line a tag br. In Android source code you can use a View as xml example bellow.


<View
android:layout_width="fill_parent"
android:layout_height="4dip"
android:background="#ffffff"
android:paddingBottom="10dip"
/>

352

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");
			}
		}

	}

Editace: 2014-02-15 20:45:39
Počet článků v kategorii: 396
Url:rename-android-project-package-issue-in-eclipse