L'ho appena fatto. Quindi ho più errori in tutti i progetti, come
...\res\values\styles.xml:7: error: Error retrieving parent for item: No resource found that matches the given name 'Theme.AppCompat.Light'.
...\res\values-v11\styles.xml:7: error: Error retrieving parent for item: No resource found that matches the given name 'Theme.AppCompat.Light'.
...\res\values-v14\styles.xml:8: error: Error retrieving parent for item: No resource found that matches the given name 'Theme.AppCompat.Light.DarkActionBar'.
...\res\values\styles.xml:7: error: Error retrieving parent for item: No resource found that matches the given name 'Theme.AppCompat.Light'.
...\res\values-v11\styles.xml:7: error: Error retrieving parent for item: No resource found that matches the given name 'Theme.AppCompat.Light'.
...\res\values-v14\styles.xml:8: error: Error retrieving parent for item: No resource found that matches the given name 'Theme.AppCompat.Light.DarkActionBar'.
...\res\values\styles.xml:7: error: Error retrieving parent for item: No resource found that matches the given name 'Theme.AppCompat.Light'.
...\res\values-v11\styles.xml:7: error: Error retrieving parent for item: No resource found that matches the given name 'Theme.AppCompat.Light'.
...\res\values-v14\styles.xml:8: error: Error retrieving parent for item: No resource found that matches the given name 'Theme.AppCompat.Light.DarkActionBar'.
...\res\values\styles.xml:7: error: Error retrieving parent for item: No resource found that matches the given name 'Theme.AppCompat.Light'.
...\res\values-v11\styles.xml:7: error: Error retrieving parent for item: No resource found that matches the given name 'Theme.AppCompat.Light'.
...\res\values-v11\styles.xml:7: error: Error retrieving parent for item: No resource found that matches the given name 'Theme.AppCompat.Light.DarkActionBar'.
...\res\values\styles.xml:7: error: Error retrieving parent for item: No resource found that matches the given name 'Theme.AppCompat.Light'.
...\res\values-v11\styles.xml:7: error: Error retrieving parent for item: No resource found that matches the given name 'Theme.AppCompat.Light'.
...\res\values-v14\styles.xml:8: error: Error retrieving parent for item: No resource found that matches the given name 'Theme.AppCompat.Light.DarkActionBar'.
...\res\values\styles.xml:7: error: Error retrieving parent for item: No resource found that matches the given name 'Theme.AppCompat.Light'.
...\res\values-v11\styles.xml:7: error: Error retrieving parent for item: No resource found that matches the given name 'Theme.AppCompat.Light'.
...\res\values-v14\styles.xml:8: error: Error retrieving parent for item: No resource found that matches the given name 'Theme.AppCompat.Light.DarkActionBar'.
Ciò significa che le risorse menzionate non sono più disponibili per i miei progetti.
Quindi ho provveduto ad aggiungere v7 appcompat
e non ho potuto eliminare i miei errori. Così ho cancellato, ed erroneamente cancellato il progetto dal disco e, in modo installato i resti (credo) di esso, e questo non è finita bene sia:
[2014-12-07 06:25:16 - android-support-v7-gridlayout] Unable to resolve target 'android-7'
[2014-12-07 06:25:16 - android-support-v7-mediarouter] Unable to resolve target 'android-17'
[2014-12-07 06:25:16 - android-support-v7-palette] Unable to resolve target 'android-7'
[2014-12-07 06:25:17 - android-support-v7-gridlayout] Unable to resolve target 'android-7'
[2014-12-07 06:25:17 - android-support-v7-palette] Unable to resolve target 'android-7'
[2014-12-07 06:25:22 - android-support-v7-mediarouter] Unable to resolve target 'android-17'
...\sdk\extras\android\support\v7\mediarouter\res\values\styles.xml:18: error: Error retrieving parent for item: No resource found that matches the given name 'Widget.AppCompat.ActionButton'.
...\sdk\extras\android\support\v7\mediarouter\res\values\styles.xml:28: error: Error retrieving parent for item: No resource found that matches the given name 'Widget.AppCompat.Light.ActionButton'.
...\sdk\extras\android\support\v7\mediarouter\res\values\styles.xml:18: error: Error retrieving parent for item: No resource found that matches the given name 'Widget.AppCompat.ActionButton'.
...\sdk\extras\android\support\v7\mediarouter\res\values\styles.xml:28: error: Error retrieving parent for item: No resource found that matches the given name 'Widget.AppCompat.Light.ActionButton'.
[2014-12-07 06:25:26 - android-support-v7-mediarouter]
Quindi sì, non farlo IT!