surfaceholder

drawn the figure through the onDraw method. Next we will analyze how to refresh the interface. What is the difference between View and SurfaceView?Simple Description:In View, android provides us with two methods to update the UI: invalidate postInvalidate. However, we also need to update the UI through Handler, which is not required by postInvalidate and can be directly updated in the thread, surfaceView can be used to update a view in a custom thread.Next let's take a look at BallView. javaPac

public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { 22 } 23 24 @Override 25 public void surfaceCreated(SurfaceHolder holder) { 26 } 27 28 @Override 29 public void surfaceDestroyed(SurfaceHolder holder) { 30 } 31 32 @Override 33 public boolean onTouchEvent(MotionEvent event)

1. Concept Surfaceview is a subclass of the View class. It is a very important drawing view to obtain image data directly from memory or DMA and other hardware interfaces. Its feature is that it can be drawn to the screen outside the main thread. In this way, the main thread blocking can be avoided when the drawing task is heavy, thus improving the response speed of the program. Surfaceview is often used in game development. The background, characters, and animations in the game should be drawn

The obvious difference between surfaceview and view is that the surface does not need to update the view through a thread, but you must use the lockcanvas method to lock the canvas before painting, and then draw the canvas, after that, use the unlockcanvasandpost method to unlock the canvas. The surfaceview class handles the same event as the View class. First, let's look at a simple framework. Drawing interface class: Package COM. example. bonusball; import android. content. context; import an

SurfaceView plays an important role in game development. Let's have a good look at the information today. With Examples written by yourself.It is enough to use View when writing a picture that is not changing fast. If you use View to write a picture that is changing too fast, the screen may flash. When writing games such as plants vs. Zombies and Fruit Ninja, you cannot use View to meet your requirements. Android provides SurfaceView, which is used for animation and a subclass of View.SurfaceVie

1. I heard that the game development are used Surfaceview, the internet search, said is Surfaceview in the update view, the use of double caching mechanism, can improve the efficiency of the update, enhance the user experience. The following two paragraphs pasted from other people's blog, said is quite clear. Note:on each pass you retrieve the canvas from the Surfaceholder, the previous state of the canvas would be retained. In order to properly anima

Package cn. c; import java. io. file; import java. io. IOException; import android. app. activity; import android. media. mediaPlayer; import android. media. mediaPlayer. onCompletionListener; import android. media. mediaPlayer. onErrorListener; import android. media. mediaPlayer. onInfoListener; import android. media. mediaPlayer. onPreparedListener; import android. media. mediaPlayer. onSeekCompleteListener; import android. media. MediaPlayer. onVideoSizeChangedListener; import android. OS. bu

First, let's take a look at the official API's introduction to Surfaceview.Surfaceview's API IntroductionProvides a dedicated drawing surface embedded inside of a view hierarchy. You can control the format of this surface and, if you like, its size; The Surfaceview takes care of placing the surface at the correctThe surface is Z, ordered so, it is behind, the window holding its surfaceview; The Surfaceview punches a hole in it window to allow it surface to be displayed. The view hierarchy'll tak

Today, let's talk about how to develop a camera on the Android platform! Here we will talk about calling the System camera. 1. Obtain the surfaceview object [html] surfaceView = (SurfaceView) findViewById (R. id. g3_server_preview); surfaceView = (SurfaceView) findViewById (R. id. g3_server_preview); 2. Declare some callback Methods later to enable the camera and set the camera parameter [html] // SurfaceHodler callback to process the camera opening, closing the camera and changing the camera si

Android Surfaceview Learning (i)First, let's take a look at the official API's introduction to Surfaceview.Surfaceview's API IntroductionProvides a dedicated drawing surface embedded inside of a view hierarchy. You can control the format of this surface and, if you like, its size; The Surfaceview takes care of placing the surface at the correctThe surface is Z, ordered so, it is behind, the window holding its surfaceview; The Surfaceview punches a hole in it window to allow it surface to be disp

. test); // No need to call setDataSource In addition, create has the following form:Create (Context context, Uri uri, SurfaceHolder holder)Create a multimedia player using Uri and the specified SurfaceHolder [abstract class] 2) set the playback file: // ① Raw Resource: MediaPlayer. create (this, R. raw. test); // ② local file path: mp. setDataSource (/sdcard/testcard); // ③ network URL File: mp. setDataSou

The previous drawing is in the custom view, but the view's drawing mechanism has the following drawbacks:1, view lacks double buffering mechanism.2. When the program needs to update the image on the view, the program must redraw the entire picture displayed on the view.3. The new thread cannot update the view component directly.Because the view has the above flaw, in the game development generally uses the Surfaceview to draw, Surfaceview generally will use with the

it and the top-level control, which will affect the performance.You can access this surface through the surfaceHolder interface. The getHolder () method can obtain this interface.When surfaceview becomes visible, the surface is created. Before surfaceview is hidden, the surface is destroyed. This saves resources. If you want to check the time when the surface is created and destroyed, you can reload surfaceCreated (

visible outside the visible area. The layout display of surface is affected by the view hierarchy, and its sibling view nodes are displayed at the top. This means that the content of surface is obscured by its sibling view, which can be used to place a cloak (overlays) (for example, text and buttons). Note that if you have transparent controls on your surface, each change will cause the framework to recalculate the transparency of its and top-level controls, which can affect performance.You can

Surfaceview window thread (typically the main thread of the program). Note the synchronization between the resource state and the drawing thread.In the drawing thread, the surface must be legally acquired before the content can begin to be drawn, in SurfaceHolder.Callback.surfaceCreated () and SurfaceHolder.Callback.surfaceDestroyed The status between () is valid and is not valid in addition to the surface type for surface_type_push_buffers.Additional drawing threads consume the resources of th

SurfaceHolder object. 2)SurfaceView is generally implemented by inheriting SurfaceView. You can use the implements interfaces Runnable and SurfaceHolder. Callback. The second interface needs to overload three functions. These three functions are the life cycle processing of SurfaceView. You can pass the implemented Callback object through the addCallback () method of the

Viewfinderview customizes the view and implements a simple scanning interface. This article record my understanding of Android camera in the code process. Since I started to write a technical blog, there are many shortcomings in the first two articles. I wrote them as needed. It is estimated that it is difficult for everyone to have a clear understanding of what I wrote. This article tries to change the style and try to express my understanding, so that everyone can understand it. Before reading

Create a preview classTo allow users to effectively obtain images and videos, they must be able to see images in the camera. A camera preview class is a SurfaceView class that can display Real-Time Images in the camera, so users can frame and capture images or videos. The Code in the following example demonstrates how to create a basic camera preview class that can be included by a viewlayout. This class implements SurfaceHolder. Callback to obtain th

Here is a test DEMO of your own, which is described in detail. Simple video recording function. Package com. video; Import java. io. IOException; Import android. app. Activity; Import android. content. pm. ActivityInfo; Import android. graphics. PixelFormat; Import android. media. MediaRecorder; Import android. OS. Bundle; Import android. view. SurfaceHolder; Import android. view. SurfaceView; Import android. view. View; Import android. view. View

Package cn. c; import java. io. file; import android. app. activity; import android. media. mediaPlayer; import android. media. mediaPlayer. onCompletionListener; import android. media. mediaPlayer. onErrorListener; import android. media. mediaPlayer. onInfoListener; import android. media. mediaPlayer. onPreparedListener; import android. media. mediaPlayer. onSeekCompleteListener; import android. media. mediaPlayer. onVideoSizeChan GedListener; import android. OS. bundle; import android. OS. env