2012-03-29 android.content.ActivityNotFoundException: Unable to find explicit activity class Android Activityの名前が間違えていたので、Manifestファイルを修正した。 android.content.ActivityNotFoundException: Unable to find explicit activity class {jp.co.app/jp.co.app.view.preferences}; have you declared this activity in your AndroidManifest.xml? Android: Activity not found exception - Stack Overflow