Android

This article translated from: http://developer.android.com/guide/topics/graphics/prop-animation.html Differences between property animation and view animation View animation provides the ability to only make the view object animated. Therefore,

This article translated from: http://developer.android.com/guide/topics/graphics/opengl.html Projection and photography views in OpenGL ES 2.0 In the ES 2.0 API, you must first add a matrix member to the vertex shaders at the top of the graphic

Animations for layout changes of viewgroups objects The property animation system provides an easy way to process the animation changes of viewgroup objects as well as view objects. Layouttransition class is used to process layout changes in

This article translated from: http://developer.android.com/guide/topics/graphics/prop-animation.html API Overview You can find the APIs of most property animation systems in the Android. animation package. Because the view animation system has

The loader function is introduced in android3.0, which makes it easy to load data asynchronously in activity or fragment. The loader has the following features: 1. The loader is valid for every activity and fagment; 2. The loader provides the

Public void oncreatecontextmenu (contextmenu menu, view V, contextmenu. contextmenuinfo menuinfo) This method is called when the context menu of the view object is displayed. Unlike oncreateoptionmenu (menu, menuinflater), this method is called

Bluetooth permission To use the Bluetooth function in your application, you must declare at least one of two bluetooth permissions (Bluetooth and th_admin. To perform any Bluetooth communication (such as requesting a connection, receiving a

Health Device Configuration Android (apilevel 14) introduces BluetoothHealth device profile (HDP) support allows you to create applications that communicate with Bluetooth-enabled health devices, such as heart rate monitor, blood pressure gauge,

Although the latest Android version often provides better APIs for applications, you should support older Android versions until more devices are updated to the new Android platform. This section describes how to continue to support older versions

Public final Boolean isadded () If the fragment object is added to its activity, true is returned; otherwise, false is returned. Public final Boolean isdetached () If the fragment has been explicitly separated from the UI, it returns true. That is,

This article translated from: http://developer.android.com/training/basics/activity-lifecycle/recreating.html Due to some common application behaviors, sometimes the activity will be destroyed, for example, when the user presses the back button or

This article translated from: http://developer.android.com/training/basics/fragments/communicating.html To reuse the fragment UI components, each fragment you create should be a self-contained modular component with its own layout and behavior. Once

Sensor Introduction The android sensor framework allows you to access multiple types of sensors. Some sensors are hardware-based and some are software-based. Hardware-based sensors are physical components built in with handheld or flat devices. They

Sensor availability Sensor availability not only varies between different hardware, but also between different Android versions. This is because the introduction of Android sensors requires the release process on several platforms. For example, some

I. Overview Java programming is often overlooked, but a very important issue is memory usage. Android applications are mainly written in Java, so this problem also occurs in Android development. This article does not discuss Java programming, but

Create a styles. xml file in the values directory and write the following code:       When calling, use the alerdialog interface class. The dialog interface writes the following code:  Dialog dialog = new dialog (setactivity. This, R. style.

1. inheritance relationship Java. Lang. Object |____ Android. App. fragmentmanager 2. class overview This class provides interfaces for interacting with fragment objects in the activity. Although fragmentmanager APIs are introduced in the honeycomb

I am studying Android development by myself recently. When I did some examples, I found that there is not much information about unit testing. I hope I can discuss it with you here. There was a question that was put on the Q & A channel for several

There are two commonly used timers on Android: Java. util. timer and alarmservice. Experiment 1: use Java. util. Timer.Create a timer in onstart (), update the counter every 5 seconds, and start. Java code Mtimer = new timer (); Mtimer. Schedule

By he minggui (http://blog.csdn.net/hmg25) reprint please indicate the source Previously, I saw the special effects of simulating book pages like iBook on iPad. on Android, there were also apps such as Laputa and ireader to implement this special