android ui components

The four basic components of Android are activity, service, content provider, and broadcastreceiver. This chapter mainly involves the following knowledge points:I. lifecycle and application scenarios of an activity: 2. Change activity to a window: Activity attribute setting 3. What should I do if your background activity is recycled by the system: onsaveinstancestate? Lifecycle of an activity: The lifecy

Recently in writing an application, want to put the Settings page and application page together, so that users can see their settings in real time to the impact of the UI, so more convenient to set the user's favorite interface. After a while, I found that this effect can be achieved by using the Slidingdrawer control. Which is a drawer. Pull open the drawer, occupy half of the screen, the other half of the screen or display application page. The effe

In Android, your application program has a fixed connection to the view class component, such as a button, text box (TextView), Editable text box (EditText), list box (ListView), check box (checkbox),Radio Box (RadioButton), ScrollBar (Gallery), spinner (Spinner), etc., there are some more advanced view components with special purpose, such as Autocompletetextview, Imageswitcher and Textswitcher. In additio

On the Android platform, there are many ways to capture user trigger events on the interface. The View class provides these methods. When you use various view views to layout the interface, you will find several common callback methods to capture useful UI trigger events. When an event is triggered on a view object, these methods are called by the system framework through this object. For example, when a vi

that content provider is activated through content resolver, the other 3 components of activity, service, and broadcast receiver are activated by intent asynchronous messages.The intent passes messages between different components, passing the request intent of one component to another component. Therefore, intent is the object that contains the specific request information.For different

In the previous study activity has been used many times Intent, when an activity needs to start another activity, the program does not directly tell the system to start which activity, Instead, they express their intentions through intent: which activity needs to be activated.Intent is not only an "intent" to encapsulate an Android application to start a component, but also an important medium for communication between application

recommended colors for Android UI---interface developmentIn the Android development process, always to add some background to the app, the individual think that the use of pure color can achieve elegant visual effect.Add some common color values: Colors.xml1 How to configure colors with Colors.xml filesandroid:background="@color/tan"The lookup is based on the lab

This topic describes services. There are two articles: Basic knowledge of Android 05: Service 01 of four components Android basic knowledge 05: four major components-service 02: Remote Call Android basic knowledge 05: four major componen