.apkextension. For example:
myExampleAppname.apk. For convenience, an application package file is often referred to as an ".apk".
Activityclass. Most commonly, an activity is visibly represented by a full screen window that can receive and handle UI events and perform complex tasks, because of the Window it uses to render its window. Though an Activity is typically full screen, it can also be floating or transparent.
ContentProviderclass, which handles content query strings of a specific format to return data in a specific format. See Content Providers topic for more information.
android.graphics.drawable. For more information about drawables and other resources, see Resources.
Intent. It includes several criteria fields that you can supply, to determine what application/activity receives the Intent and what the receiver does when handling the Intent. Available criteria include include the desired action, a category, a data string, the MIME type of the data, a handling class, and others. An application sends an Intent to the Android system, rather than sending it directly to another application/activity. The application can send the Intent to a single target application or it can send it as a broadcast, which can in turn be handled by multiple applications sequentially. The Android system is responsible for resolving the best-available receiver for each Intent, based on the criteria supplied in the Intent and the Intent Filters defined by other applications. For more information, see Intents and Intent Filters.
javax.microedition.khronos.openglespackages expose OpenGL ES functionality.
res/*subfolders of the project.
Servicethat runs in the background (without any UI presence) to perform various persistent actions, such as playing music or monitoring network activity.
Surfacerepresenting a block of memory that gets composited to the screen. A Surface holds a Canvas object for drawing, and provides various helper methods to draw layers and resize the surface. You should not use this class directly; use
R.style(starting with "Theme_").
content://. In an Intent, a URI using an
http://scheme will be handled by the browser.
widgetpackage, but extend
Windowthat specifies the elements of a generic window, such as the look and feel (title bar text, location and content of menus, and so on). Dialog and Activity use an implementation of this class to render a window. You do not need to implement this class or use windows in your application.