Android

Kinship refers to the task that the activity is willing to belong. By default, from the same applicationProgramAll the activities have a kinship with each other. Therefore, by default, all activities in the same application should belong to the same

Binding services allow applicationsProgramA component creates a long-term association with the service by calling the bindservice () method (the component is usually not allowed to start it by calling the startservice () method ). When you want

Once the service is running, you can use toast notifications or status bar notifications to notify users. A broadcast notification is a message temporarily displayed on the current window, and a status bar message provides a message icon in the

Although fragment is an object implemented independently of the activity and can be used within multiple activities, a given fragment instance is directly bundled into its activity. In particular, fragment can use the getactivity () method to

An activity is an interface component provided for users to interact with a program, such as making a call, taking a photo, sending an email, or viewing a map. Each activity is an interface used to describe the user interface. Normally, this window

This article translated from: http://developer.android.com/guide/topics/graphics/2d-graphics.html Drawing Android provides a custom 2D graphics class library for drawing graphics and images. The android. Graphics. drawable package can find a common

This article translated from: http://developer.android.com/guide/topics/graphics/hardware-accel.html Since android3.0 (API level 11), Android 2D rendering pipelines can better support hardware acceleration. All the drawing operations performed by

A service is an application component that can perform long-term operations in the background without providing a user interface. An application component can start a service. Even if the user switches to another application, the Service will

Android provides several options for storing persistent application data. Select a suitable solution based on specific requirements, such as whether the data is private or shared by the application, and the storage space required by the data. The

The Android platform provides a wide range of visual UI components-Widgets. By combining these small visual components, You can provide users with complex and useful interfaces. However, applications often need some advanced visual components. To

The android backup service is integrated into the android data backup framework. It is used to back up and restore data on most devices running Android or later. In some cases, the specific Android device may contain different backup transmitters

This article translated from: http://developer.android.com/training/basics/intents/sending.html One of the important features of Android is to bring users into another application based on the specific "action" to be executed. For example, if your

This article translated from: http://developer.android.com/guide/topics/renderscript/compute.html#creating-renderscript The rendering script (renderscript) provides a native high-performance computing API written in C Language (c99 standard.

Use the animatorset class to orchestrate multiple animations In many scenarios, playing an animation depends on the start or end of another animation. The Android system allows you to bind these interdependent animations to an animatorset object so

In some cases, fragment and activity sharing events may be required. Defining a callback interface within fragment is a good method and requires that the callback method be implemented by the activity holding it. When an activity receives a callback

Fragment provides a menu item for the optional menu (including the action bar) of the activity by implementing the oncreateoptionsmenu () method. However, to make this method acceptable, you must call sethasoptionsmenu () in the oncreate () method ()

Use viewpropertyanimator to create an animation The viewpropertyanimator class uses a single animator object to provide a simple method for parallel processing of several animation attributes of a view object. Its behavior is very similar to the

Rollback Stack The edited transaction in fragment can be placed in its own activity and rolled back to the stack. When you press the return button in the activity, a stack will pop up before any transaction in the rollback stack ends. For example,

As the Connected ServerWhen you want to connect two devices, one must hold an opened javasthserversocket object as the server. The service socket is used to listen to input connection requests and provide a thsocket connection object when a

Class description 1. Nested classes Class fragment. instantiationexception If an instantiation error occurs, the exception class is thrown through the instantiate (context, String, bundle) method. Class fragment. savedstate You can use the