Android

If you leave a task for a long time, the system will clear all activities other than the root activity of the task. When the user returns this task again, only the root activity is stored. This method of system behavior is because after a long time,

Adroid provides developers with a development platform to build rich and novel applications.ProgramCapabilities. Developers can freely use hardware devices, access local information, run background services, Set alarms, and add notifications on the

Most started services do not need to process multiple requests at the same time (this is actually a dangerous multi-threaded scenario). Therefore, using intentservice classes to implement your own services may be the best. The intentservice class

Style resources define the format and appearance of the UI. A style can be applied to a single view object, an entire activity, or an entire application. Note: A style is a simple resource type that can reference resources using the value provided

1. inheritance relationship Java. Lang. Object | _____ Android. OS. Message Implement the parcelable interface. 2. class overview This class defines a message that can be sent to the handler object. It contains the Message description and any data

1. inheritance relationship Java. Lang. Object | _____ Android. widget. Toast 2. class overview A toast is a window that contains short messages to remind users. The toast class will help you create and display this window. When this window is

  Localized checklists These checklists summarize the process of localized Android applications, not that each item in the list applies to each application. Planning and Designing Checklist 1 Select a localization policy. What countries

Adapterview is a subclass of viewgroup. Its subview is determined by the adapter class bound to some types of data. Adapterview helps to display stored data (relative to a resource string or can be traced) in the layout as needed ). Gallery,

When the activity receives the focus, it will request to describe its layout. The android framework will deal with this plotting process, but the activity must provide its layout hierarchy and nodes. It starts from the root node of the layout. It

Style attributes After understanding how a style is defined, you need to learn that elements define valid style attribute types. You may already be familiar with layout_width and textcolor attributes, but there are more style attributes that can be

This document describes the usage, format, and syntax of each application resource type in the resource catalog (RES. The following is an overview of each resource type: Animation Resources) Define a predefined Animation The animation is saved in

Public void settargetfragment (fragment, int requestcode) This method sets an optional target for this fragment object. For example, if this fragment object is started by another fragment object and you want to return a given result to the first

This article translated from: http://developer.android.com/guide/topics/graphics/hardware-accel.html View Layer In all versions of Android, view objects can be rendered in the off-screen buffer by using the drawing buffering of the view object or

To create a service, you must create a subclass of a service class (or a existing service subclass. In your implementation, You need to rewrite some callback methods that process key features of the service life cycle, and provide a suitable service

This article translated from: http://developer.android.com/guide/topics/graphics/opengl.html OpenGL package Once glsurfaceview and glsurfaceview. Renderer class are used to create a view container for OpenGL, the following classes can be used to

Nine-patch Ninepatchdrawable is an extensible bitmap image. The Android system automatically adjusts the background image based on the content of the view object. An example of using ninepatch is the background image of the standard Android

A started service must manage its own lifecycle. That is to say, unless the system needs to recycle the system memory, the system will not terminate or destroy this service. After the onstartcommand () method returns, this service will continue to

This article translated from: http://developer.android.com/guide/topics/renderscript/advanced.html Because the application using renderscript still runs inside the android Virtual Machine (VM), you can access all the framework APIs you are familiar

Create renderscript Renderscript expands the range of processor kernels available on the device. This capability is obtained through the method called rsforeach () (or the foreach_root () method at the android framework level. It automatically

This article translated from: http://developer.android.com/training/basics/data-storage/shared-preferences.html If you have a relatively small set of key-value pairs to be saved, you should use sharepreferencesAPIS. The sharepreferences object