WO2013060245A1 - 用于移动终端的应用屏幕截图方法和装置 - Google Patents

用于移动终端的应用屏幕截图方法和装置 Download PDF

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Publication number
WO2013060245A1
WO2013060245A1 PCT/CN2012/083012 CN2012083012W WO2013060245A1 WO 2013060245 A1 WO2013060245 A1 WO 2013060245A1 CN 2012083012 W CN2012083012 W CN 2012083012W WO 2013060245 A1 WO2013060245 A1 WO 2013060245A1
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Prior art keywords
screenshot
specified
application screen
application
instruction
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PCT/CN2012/083012
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English (en)
French (fr)
Inventor
吴维彬
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华为终端有限公司
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Application filed by 华为终端有限公司 filed Critical 华为终端有限公司
Priority to IN3386CHN2014 priority Critical patent/IN2014CN03386A/en
Priority to KR1020147012685A priority patent/KR101693563B1/ko
Priority to JP2014537475A priority patent/JP5887419B2/ja
Priority to EP12842933.9A priority patent/EP2763034B1/en
Publication of WO2013060245A1 publication Critical patent/WO2013060245A1/zh
Priority to US14/262,171 priority patent/US10078434B2/en
Priority to US16/100,495 priority patent/US11016641B2/en

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    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/048Interaction techniques based on graphical user interfaces [GUI]
    • G06F3/0484Interaction techniques based on graphical user interfaces [GUI] for the control of specific functions or operations, e.g. selecting or manipulating an object, an image or a displayed text element, setting a parameter value or selecting a range
    • G06F3/04845Interaction techniques based on graphical user interfaces [GUI] for the control of specific functions or operations, e.g. selecting or manipulating an object, an image or a displayed text element, setting a parameter value or selecting a range for image manipulation, e.g. dragging, rotation, expansion or change of colour
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F9/00Arrangements for program control, e.g. control units
    • G06F9/06Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
    • G06F9/44Arrangements for executing specific programs
    • G06F9/451Execution arrangements for user interfaces

Definitions

  • the present invention relates to the field of mobile terminals, and in particular, to an application screenshot method and apparatus for a mobile terminal. Background technique
  • Android is equipped with Android system.
  • Android is a software platform for developing mobile programs. It includes operating system, middleware and some key applications.
  • Mobile End User Switching Activity (Activity) is a standard component of the Android platform. In fact, an Activity is a single screen in the application, it inherits from the Activity class, it will display the UI composed of Views and response events.
  • the application scenario such as the task manager and the home desktop application is managed under the Android platform
  • only the background running is obtained.
  • the application screen cannot read all the screens of the historical application. It is not easy for the user to find the application that he wants to switch. Therefore, when the application is switched, the UI (User Interface) has less room for display, the display is not intuitive, and the user experience is poor.
  • Embodiments of the present invention provide an application screenshot method and apparatus for a mobile terminal.
  • the technical solution is as follows:
  • An application screenshot method for a mobile terminal comprising:
  • An application screenshot device for a mobile terminal comprising: a receiving module, configured to receive an instruction for closing a specified application screen;
  • a screenshot module configured to intercept a specified area of the specified application screen, to obtain a screenshot of the specified area
  • a saving module configured to save the specified area screenshot, and close the specified application screen.
  • the beneficial effects of the technical solution provided by the embodiment of the present invention are: by taking a screenshot of the application screen before the Activity screen is closed before closing the application screen activity, obtaining the last real screen of the Activity, avoiding after the application screen is closed.
  • the high memory footprint caused by the screenshots improves the screen capture efficiency and reduces the memory usage and number of calls.
  • FIG. 1 is a flow chart of an application screenshot method for a mobile terminal according to an embodiment of the present invention
  • FIG. 2 is a flow chart of an application screenshot method for a mobile terminal according to an embodiment of the present invention
  • FIG. 3 is a flowchart of an example of an application screenshot method for a mobile terminal in a JAVA environment according to an embodiment of the present invention
  • FIG. 4 is a schematic structural diagram of an application screen capture apparatus for a mobile terminal according to an embodiment of the present invention. detailed description
  • Activity is a standard component of the Android platform.
  • an Activity is a single screen in the application, it inherits from the Activity class, it will display the UI composed of Views And responding to events.
  • History Activity is a historical Activity, which refers to the Activity that the user has opened, including the activity that is running in the background.
  • Surface View is a special View view class for the Android platform. It is the parent class of the two 3D view classes, GLSurface View and RSSurfaceView. Both of these 3D view classes run on their own separate drawing threads. Therefore, it is different from other common View view classes.
  • Live Wappaper refers to the dynamic wallpaper of the Android platform, usually implemented by the RSSurfaceView view class.
  • ActivityManager Service refers to the Activity Management Service, which is a key system service in the Android platform.
  • WindowManagerService refers to the Window Management Service, which is a key system service in the Android platform.
  • TaskManager refers to the task manager, which is an Android application with functions such as task display, switching and killing.
  • FIG. 1 is a flow chart of an application screenshot method for a mobile terminal according to an embodiment of the present invention.
  • the executor of the embodiment is a mobile terminal. Referring to FIG. 1 , the embodiment specifically includes:
  • At least one application is running on the mobile terminal, and the application is currently in a full screen state.
  • the instruction to close the specified application screen is a switching instruction that switches the specified application to run in the background, or switches another application to a switching instruction that runs in the foreground, or turns off the closing instruction of the specified application.
  • the instruction when the instruction is to switch the specified application to the background running switching instruction, the instruction may be manually triggered by the mobile terminal user, for example, minimizing the specified application, etc., the instruction may also be triggered according to a preset condition, for example, specifying a program If it is idle within 20 minutes, a switch instruction for switching the specified application to background operation is triggered.
  • the life cycle of an application Acitvity includes: When an Activity is started, after the execution of the Activity() constructor is completed, the system calls the onCreate() method, where the global state and resources of the Activity are set, and then onStart is called. () method, after this method is executed, the Activity is visible on the screen. Execute the onResume() method, this time Acitvity waits for a window event in a loop loop. When the window is partially visible, that is, Acitvity is not At the very front end, the Activity's onFreeze() method is called, which saves some internal state of the Activity. The window then pauses until the Activity appears at the front end, and the activity's onResume() method is called.
  • the Activity window is not visible, then the Activity's onStop() method is called, until the activity's window is closed, the activity's onRestart() method starts, and then the onStart() method is repeated.
  • the system recycles the resource or the Activity is called the finish() method, the Activity stops and calls onDestroy() to release the resources owned by the Activity.
  • the designated area may be the entire application screen, or may be an area preset by the mobile terminal, which is not specifically limited in the embodiment of the present invention.
  • step 102 of the embodiment is performed after receiving the instruction to close the specified application screen and before closing the designated application screen, as compared with the description of the life cycle of the Acitvity in the prior art in step 101.
  • the screen capture in the prior art occurs after the onStop() method is called, and the screen capture of the present invention is after the onStop() method is called after the onPause() method is called.
  • the specified application screen is closed, and the specified application is closed or the designated application is switched to the background operation according to the received instruction.
  • step 103 the method further includes:
  • the specified area screenshot is obtained, and the specified area screenshot is displayed.
  • the method provided in this embodiment can take a screenshot of the application screen and obtain the last real screen of the Activity by closing the application screen before closing the application screen activity, thereby avoiding the high memory usage caused by the screenshot after the application screen is closed. Improve screen capture efficiency, reduce memory usage and number of calls.
  • FIG. 2 is a flow chart of an application screenshot method for a mobile terminal according to an embodiment of the present invention.
  • the executor of the embodiment is a mobile terminal, and a specified application is currently running on the mobile terminal.
  • the embodiment specifically includes:
  • the mobile terminal receives an instruction to close a specified application screen.
  • This step 201 is the same as the principle of step 101, and details are not described herein again.
  • the mobile terminal displays the specified application screen according to a local display size and a preset zoom ratio.
  • the specified area of the screen is zoomed, and the scaled thumbnail is captured to obtain a screenshot of the designated area.
  • the local display size refers to the display size of the mobile terminal, generally, the size and locality of the application screen.
  • the size of the display screen is the same, that is, the original size of the screenshot is the size of the local display screen; the designated area of the designated application screen can be set by the mobile terminal user according to the browsing habit, and the designated area can be the full screen area of the specified application screen, or A certain area of the application screen is specified; the preset zoom ratio is set by the mobile terminal user according to the browsing habits and the like, and is not specifically limited in the embodiment of the present invention.
  • the step 202 specifically includes: the mobile terminal acquires a local display size and a preset zoom ratio, and uses a local display size to specify an initial size of the application screen, and scales a specified area of the specified application screen according to a preset zoom ratio. , get the zoomed thumbnail, and capture the scaled thumbnail to get a screenshot of the specified area.
  • drawFBO is a drawing method
  • the drawing method acquires the current image of the display by calling a preset display device, and reads the preset display device.
  • the buffer pixel uses the buffer pixel to generate a Bitmap image. Since drawFBO draws through a preset display device, its range also includes the status bar of the display, which expands the range of the screenshot.
  • drawFB() can be specifically represented as follows:
  • SkBitmap* bitmap new SkBitmap(); ⁇ construct a bitmap
  • the specified area of the specified application screen is intercepted, and a screenshot of the specified area is obtained.
  • the specified application screen is closed, and the step of closing the specified application screen ensures the integrity and validity of the screenshot after the screenshot, avoiding the screenshot after the shutdown and causing the screenshot to be black, so that the view by the GLSurfaceView class
  • the activity or background of the elements, RSSurfaceView class view elements is the Live Wallpaper class's Activity can accurately capture the screen.
  • the instruction to view the specified application may be an instruction to view a history application or an instruction to view an application running in the background.
  • the command may be triggered by the task manager of the mobile terminal, for example, when the task manager of the mobile terminal is started, displaying a screenshot of the specified area of the application running in the background, so that the mobile terminal user can intuitively view the application running in the background, and It is known that the application running in the background is applied to a certain historical application or the background running application, which is not specifically limited in the embodiment of the present invention.
  • the mobile terminal can perform operations such as browsing, switching, and releasing the specified application according to the received operation instruction.
  • the browsing refers to viewing the last running state of the specified application.
  • the switching refers to switching the specified application from the foreground running to the background running, or switching the specified application from the background running to the foreground running, and releasing refers to deleting the specified area of the specified program. Screenshot.
  • the above embodiments can be used in embedded products of the android platform, such as tablet computers, set top boxes and fixed stations.
  • FIG. 3 is a flow chart of an example of the application screen capture method for the mobile terminal in the JAVA environment according to an embodiment of the present invention.
  • the onCreate(), onStart(), onRestart(), onResume(), drawFB(), onPause(), onStop(), onDestory() are abstract functions in the present invention, and are not specifically implemented.
  • the specific application is overloaded.
  • For the life cycle of an Activity there are the following processes: When the Activity starts, it calls onCreate(), onStart(), and onResumeQ to make the Activity run normally, and when the Activity screen switches, call drawFB().
  • the method provided in this embodiment can take a screenshot of the application screen and obtain the last real screen of the Activity by closing the application screen before closing the application screen activity, thereby avoiding the high memory usage caused by the screenshot after the application screen is closed. Improve screen capture efficiency, reduce memory usage and number of calls.
  • FIG. 4 is a schematic structural diagram of an application screenshot device for a mobile terminal according to an embodiment of the present invention. Referring to FIG. 4, the embodiment specifically includes:
  • a receiving module 401 configured to receive an instruction for closing a specified application screen
  • a screenshot module 402 configured to intercept a specified area of the specified application screen, to obtain a specified area cut-off;
  • the saving module 403 is configured to save the specified area screenshot and close the specified application screen.
  • the screenshot module 402 includes:
  • a zooming unit configured to scale a specified area of the specified application screen according to a local display size and a preset zoom ratio
  • the screenshot unit is configured to intercept the scaled thumbnail and obtain a screenshot of the specified area.
  • the device also includes:
  • a display module configured to: when receiving an instruction to view the specified application, obtain the screenshot of the specified area, and display the specified area screenshot.
  • the instruction for closing the specified application screen is a switching instruction to switch the specified application to the background operation, or to switch another application to a switching instruction running in the foreground, or to close the closing instruction of the specified application.
  • the device provided in this embodiment may be a mobile terminal, and the method is the same as the method embodiment.
  • the method is the same as the method embodiment.
  • details refer to the method embodiment, and details are not described herein.
  • All or part of the above technical solutions provided by the embodiments of the present invention may be completed by hardware related to program instructions, and the program may be stored in a readable storage medium, and the storage medium includes: ROM, RAM, disk or CD. And other media that can store program code.

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Abstract

公开了一种用于移动终端的应用屏幕截图方法和装置,涉及移动终端领域。该方法包括:接收用于关闭指定应用屏幕的指令(101);截取所述指定应用屏幕的指定区域,得到指定区域截图(102);保存所述指定区域截图,关闭所述指定应用屏幕(103)。该装置包括:接收模块、截图模块和保存模块。本方案通过在关闭应用屏幕活动(Activity)之前,Activity窗口还可见时,对应用屏幕进行截图,获取Activity的最后一次的真实截图,避免在关闭应用屏幕之后进行截图造成的高内存占用,提高截屏效率,降低内存占用和调用次数。

Description

用于移动终端的应用屏幕截图方法和装置 本申请要求于 2011 年 10 月月 26 日提交中国专利局、 申请号为 201110329295.3、 发明名称为"用于移动终端的应用屏幕截图方法和装置 "的中 国专利申请的优先权, 其全部内容通过引用结合在本申请中。 技术领域
本发明涉及移动终端领域,特别涉及一种用于移动终端的应用屏幕截图方 法和装置。 背景技术
随着移动终端的发展,智能手机上多装有 Android系统, Android是 google 开源的一个用于开发移动程序的软件平台, 它包括了操作系统、 中间件及一些 关键应用。移动终端用户切换活动( Activity )是 Android平台的一种标准组件。 实际上一个 Activity就是应用中的一个单一的屏幕, 它继承自 Activity类, 它 将显示由 Views组成的 UI以及响应事件。
在对现有技术进行分析后, 发明人发现现有技术至少具有如下缺点: 现有技术在 Android平台下对任务管理器和 Home桌面应用程序等应用场 景等进行管理时, 只能获取后台运行的应用屏幕, 无法读取所有历史应用的屏 幕,用户不容易找到自己想切换的应用,使得在应用切换时, UI( User Interface, 用户界面)发挥的余地少, 显示不直观, 用户体验差。 发明内容
本发明实施例提供了一种用于移动终端的应用屏幕截图方法和装置。所述 技术方案如下:
一种用于移动终端的应用屏幕截图方法, 包括:
接收用于关闭指定应用屏幕的指令;
截取所述指定应用屏幕的指定区域, 得到指定区域截图;
保存所述指定区域截图, 关闭所述指定应用屏幕。
一种用于移动终端的应用屏幕截图装置, 包括: 接收模块, 用于接收用于关闭指定应用屏幕的指令;
截图模块, 用于截取所述指定应用屏幕的指定区域, 得到指定区域截图; 保存模块, 用于保存所述指定区域截图, 关闭所述指定应用屏幕。
本发明实施例提供的技术方案的有益效果是: 通过在关闭应用屏幕 Activity之前, Activity窗口还可见时, 对应用屏幕进行截图, 获取 Activity的最 后一次的真实屏幕, 避免了在关闭应用屏幕之后进行截图造成的高内存占用, 提高了截屏效率, 降低了内存占用和调用次数。 附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案,下面将对实施 例或现有技术描述中所需要使用的附图作简单地介绍,显而易见地, 下面描述 中的附图仅仅是本发明的一些实施例,对于本领域普通技术人员来讲, 在不付 出创造性劳动性的前提下, 还可以根据这些附图获得其他的附图。
图 1是本发明实施例提供的一种用于移动终端的应用屏幕截图方法的流程 图;
图 2是本发明实施例提供的一种用于移动终端的应用屏幕截图方法的流程 图;
图 3是本发明实施例提供的一种用于移动终端的应用屏幕截图方法的在 JAVA环境中示例的流程图;
图 4是本发明实施例提供的一种用于移动终端的应用屏幕截图装置的结构 示意图。 具体实施方式
为使本发明的目的、技术方案和优点更加清楚, 下面将结合附图对本发明 实施方式作进一步地详细描述。
在介绍本发明提供的应用屏幕截图方法之前,首先对本发明的基础知识进 行简要的介绍:
Activity是 Android平台的一种标准组件。 实际上一个 Activity就是应用 中的一个单一的屏幕, 它继承自 Activity类, 它将显示由 Views组成的 UI以 及响应事件。
History Activity为历史 Activity, 是指用户曾经打开过的 Activity, 包含正 在后台运行任务中的 Activity。
Surface View是 Android平台的一种特殊 View视图类。它是 GLSurface View 和 RSSurfaceView这两种 3D视图类的父类。 这两种 3D视图类都运行在自己 独立的绘制线程。 故不同于其他普通 View视图类。
Live Wappaper是指 Android平台的动态墙纸,通常是由 RSSurfaceView视 图类实现的。
ActivityManager Service是指 Activity管理服务, 是 Android平台中的一个 关键系统服务。
WindowManagerService是指 Window管理服务,是 Android平台中的一个 关键系统服务。
TaskManager: 是指任务管理器, 是一个具有任务显示, 切换和杀死等功 能的 Android应用程序。 图 1 是本发明实施例提供的一种用于移动终端的应用屏幕截图方法的流 程图。 该实施例的执行主体是移动终端, 参见图 1 , 该实施例具体包括:
101、 接收用于关闭指定应用屏幕的指令;
在本实施例中,移动终端上运行至少一个应用, 该应用当前可处于全屏状 态。 该用于关闭指定应用屏幕的指令为将指定应用切换至后台运行的切换指 令, 或将另一应用切换至前台运行的切换指令, 或关闭指定应用的关闭指令。 其中, 当指令为将指定应用切换至后台运行的切换指令时, 该指令可以由移动 终端用户手动触发, 如, 将指定应用最小化等, 该指令还可以根据预设条件触 发, 如, 指定程序在 20分钟内处于空闲状态, 则触发用于将指定应用切换至 后台运行的切换指令。
本领域技术人员可以获知, 一个应用 Acitvity的生命周期包括: 启动一个 Activity时, Activity ()的构造函数执行完毕后, 系统调用 onCreate()方法, 在这 里设置 Activity的全局状态和资源, 然后调用 onStart()方法, 在这个方法执行 完毕, Activity在屏幕中可见。 执行 onResume()方法, 这个时候 Acitvity在一 个 loop循环中的等待窗口事件。 当窗口部分可见时,也就是说 Acitvity不是在 最前端时, Activity的 onFreeze()方法被调用 , 这个方法保存 Activity一些内部 状态。 然后窗口暂停, 直到 Activity又出现在最前端, activity的 onResume() 方法被调用。 如果 Activity窗口不可见, 则说明 Activity的 onStop()方法被调 用, 直到覆盖 Activity的窗口关闭时, activity的 onRestart()方法开始调用, 然 后重复 onStart()方法。 当系统回收资源或者 Activity被调用 finish()方法时, Activity停止 , 调用 onDestroy()释放 Activity拥有的资源。
102、 截取所述指定应用屏幕的指定区域, 得到指定区域截图;
在本实施例中, 该指定区域可以是整个应用屏幕, 也可以是由移动终端预 设的区域, 本发明实施例不做具体限定。 通过对指定区域的截屏, 可以获取状 态栏的视图, 还可以根据需要是否含状态栏部分。
需要说明的是,本实施例的步骤 102是在接收到关闭指定应用屏幕的指令 之后,并在关闭指定应用屏幕之前进行的,与步骤 101中对现有技术中 Acitvity 的生命周期的描述相对比, 现有技术中的截屏发生在调用 onStop()方法之后, 而本发明的截屏是在调用 onPause()方法之后, 调用 onStop()方法之前。
103、 保存所述指定区域截图, 关闭所述指定应用屏幕。
在本实施例中,移动终端保存对指定应用屏幕的截图后, 关闭该指定应用 屏幕, 根据接收到的指令, 关闭该指定应用或将指定应用切换到后台运行。
步骤 103之后, 还包括:
当接收到查看所述指定应用的指令时, 获取所述指定区域截图, 并显示所 述指定区域截图。
本实施例提供的方法,通过在关闭应用屏幕 Activity之前,窗口还可见时, 对应用屏幕进行截图, 获取 Activity的最后一次的真实屏幕, 避免了在关闭应 用屏幕之后进行截图造成的高内存占用,提高了截屏效率, 降低了内存占用和 调用次数。
图 2 是本发明实施例提供的一种用于移动终端的应用屏幕截图方法的流 程图。 该实施例的执行主体是移动终端, 移动终端上当前运行一指定应用, 参 见图 2, 该实施例具体包括:
201、 移动终端接收到关闭指定应用屏幕的指令;
该步骤 201与步骤 101原理相同, 在此不再赘述。
202、 移动终端根据本地显示屏尺寸和预设缩放比例, 将所述指定应用屏 幕的指定区域进行缩放, 并截取所述缩放后的缩略图, 得到指定区域截图; 在本实施例中, 本地显示屏尺寸是指移动终端的显示屏尺寸, 一般地, 应 用屏幕的尺寸与本地显示屏的尺寸相同,也即是截图的原始尺寸为本地显示屏 的尺寸; 指定应用屏幕的指定区域可由移动终端用户根据浏览习惯设置, 该指 定区域可以为指定应用屏幕的全屏区域, 也可以为指定应用屏幕的某个区域; 预设缩放比例由移动终端用户根据浏览习惯等设置,本发明实施例不做具体限 定。 则该步骤 202具体包括: 移动终端获取本地显示屏尺寸和预设缩放比例, 并以本地显示屏尺寸为指定应用屏幕的初始尺寸,按照预设缩放比例,将该指 定应用屏幕的指定区域进行缩放, 获取缩放后的缩略图, 并截取缩放后的缩略 图, 得到指定区域截图。
该截图的具体方法可以通过调用 drawFBO完成, 本领域技术人员可以获 知, drawFBO是一种画图方法, 该画图方法通过调用一预设显示设备获取显示 屏当前的图像, 并读取该预设显示设备的緩冲区像素,使用该緩冲区像素生成 Bitmap图像, 由于 drawFBO是通过预设显示设备进行画图, 其范围也包括该 显示屏的状态栏, 扩大了截屏的范围。
例如, 该 drawFB()函数具体可以有如下表示:
static void drawFB(J IEnv* env, jobject j canvas, SkCanvas* canvas) {
struct fb var screeninfo vinfo;
int fd;
int offset;
int bpp;
int size;
int w;
int h;
unsigned i;
unsigned bytespp;
unsigned char* buf; fd = open( dev/graphics/fb0", O— RDONLY);〃打 fb设备
if (fd < 0) { return;
if (ioctl(fd, FBIOGET— VSCREENINFO, &vinfo) < 0) {//取 fb设备 参数
close(fd);
return;
fcntl(fd, F SETFD, FD CLOEXEC);
bytespp = vinfo.bits_per_pixel I 8;
bpp = vinfo.bits_per_pixel;
size = vinfo.xres * vinfo.yres * bytespp;
w = vinfo.xres;
h = vinfo.yres;
/* HACK: for several of our 3d cores a specific alignment
* is required so the start of the fb may not be an integer number of lines
* from the base. As a result we are storing the additional offset m
* xoffset. This is not the correct usage for xoffset, it should be added
* to each line, not just once at the beginning
*/
offset = vinfo. xoffset * bytespp; offset += vinfo.xres * vinfo. yoffset * bytespp;
lseek(fd, offset, SEEK— SET);
buf = (unsigned char*)malloc(size); if (buf == NULL) {
close(fd);
return:
memset(buf, 0, size);
read(fd, buf, size);//取 fb像素数据
SkBitmap* bitmap = new SkBitmap();〃构造一张位图
SkAutoLockPixels alp(*bitmap);
//Config K GB— 565— Config if one pixel is descriped by two Bytes if (TWO— BYTES == bytespp) {
bitmap -〉 setConfig( SkBitmap: :kRGB— 565— Config, w, h);
} else {
bitmap -〉 setConfig( SkBitmap: :kA GB— 8888— Config, w, h); bitmap -〉 setPixels(buf);//将这张位图的像素数据设为从 fb设备获 取到的像素 canvas->drawBitmap(*bitmap, 0, 0, NULL);〃绘制位图到 canvas中 close(fd);〃关闭 fb设备
free(buf);〃释放 buf内存
bitmap -〉 setPixels(NULL, NULL);〃释放像素数据 delete bitmap;〃回收 bitma 实例
203、 保存指定区域截图, 关闭指定应用屏幕;
在本实施例中, 截取所述指定应用屏幕的指定区域, 得到指定区域截图, 保存该指定区域截图后, 关闭指定应用屏幕, 该关闭指定应用屏幕的步骤在截 图之后,保证了截图的完整性和有效性,避免了在关闭之后进行截图而导致截 图黑屏, 使得由 GLSurfaceView类视图元素、 RSSurfaceView类视图元素构成 的 Activity或背景是 Live Wallpaper类墙纸的 Activity 能够准确截屏。
204、 当接收到查看所述指定应用的指令时, 获取所述指定区域截图, 并 显示所述指定区域截图。
在本实施例中,该查看指定应用的指令可以为查看历史应用的指令或查看 后台运行应用的指令。 该指令可以由移动终端的任务管理器启动触发, 例如, 当移动终端的任务管理器启动时, 显示保存后台运行的应用的指定区域截图, 使得移动终端用户能够直观的查看后台运行的应用,并获知后台运行的应用的 对某一个历史应用或后台运行应用, 本发明实施例不做具体限定。在该实施例 中, 移动终端可根据接收到的操作指令, 对指定应用进行浏览、 切换和释放等 操作。 其中, 浏览是指对指定应用的最后运行状态进行查看, 切换是指将指定 应用从前台运行切换到后台运行, 或将指定应用从后台运行切换到前台运行, 释放是指删除指定程序的指定区域截图。
上述实施例可用于釆用 android平台的嵌入式产品中, 如平板电脑, 机顶 盒和固定台等。
举例说明,现有技术中,一个新的 Activity进入前台运行时,老的 Activity 进入了 onPause()生命状态, 此时老的 Activity仍然可见。 当老 Activity窗口不 可见时, 老的 Activity就进入了 onStop()生命状态。 android平台的截屏算法是 在 onStop()生命状态进行截取, 因为窗口不可见, 所以需重新绘制老 Activity 而得到屏幕缩略图。 这样不但效率低下, 还难以获取老 Activity的最后一次的 真实屏幕。 因此, 本发明实施例釆用在 onPause()生命状态中进行截图, 参见 图 3 , 图 3是本发明实施例提供的一种用于移动终端的应用屏幕截图方法的在 JAVA环境中示例的流程图。 其中, 在本发明中所说的 onCreate()、 onStart()、 onRestart()、 onResume() ^ drawFB()、 onPause()、 onStop()、 onDestory()均为抽 象函数, 没有具体实现, 需要具体应用重载实现。 对于一个 Activity的生命周 期来说, 有以下过程: Activity 开始时, 依次调用 onCreate()、 onStart()和 onResumeQ, 使 Activity正常运行, 而当 Activity屏幕切换时, 调用 drawFB() 进行截屏, 再调用 onStop(), 此时 Activity已不可见, 后续可以有以下三种情 况的任意一种: 调用 onDestoryO, 该 Activity结束; 或, 当另一 Activity需要 内存时, 杀死进程, 另一 Activity调用 onCreate(); 或, 当该 Activity再次进入 前台, 调用 onRestart();
本实施例提供的方法,通过在关闭应用屏幕 Activity之前,窗口还可见时, 对应用屏幕进行截图, 获取 Activity的最后一次的真实屏幕, 避免了在关闭应 用屏幕之后进行截图造成的高内存占用,提高了截屏效率, 降低了内存占用和 调用次数。
图 4 是本发明实施例提供的一种用于移动终端的应用屏幕截图装置的结 构示意图。 参见图 4 , 该实施例具体包括:
接收模块 401 , 用于接收用于关闭指定应用屏幕的指令;
截图模块 402 , 用于截取所述指定应用屏幕的指定区域, 得到指定区域截 图;
保存模块 403 , 用于保存所述指定区域截图, 关闭所述指定应用屏幕。 其中, 所述截图模块 402包括:
缩放单元, 用于根据本地显示屏尺寸和预设缩放比例,将所述指定应用屏 幕的指定区域进行缩放;
截图单元, 用于截取所述缩放后的缩略图, 得到指定区域截图。
所述装置还包括:
显示模块, 用于当接收到查看所述指定应用的指令时, 获取所述指定区域 截图, 并显示所述指定区域截图。
所述用于关闭指定应用屏幕的指令为将所述指定应用切换至后台运行的 切换指令, 或将另一应用切换至前台运行的切换指令, 或关闭所述指定应用的 关闭指令。
本实施例提供的装置, 具体可以移动终端, 与方法实施例属于同一构思, 其具体实现过程详见方法实施例, 这里不再赘述。
本发明实施例提供的上述技术方案的全部或部分可以通过程序指令相关 的硬件来完成, 所述程序可以存储在可读取的存储介质中, 该存储介质包括: ROM, RAM, 磁碟或者光盘等各种可以存储程序代码的介质。
以上所述仅为本发明的较佳实施例, 并不用以限制本发明, 凡在本发明的 精神和原则之内, 所作的任何修改、 等同替换、 改进等, 均应包含在本发明的 保护范围之内。

Claims

权 利 要 求
1、 一种用于移动终端的应用屏幕截图方法, 其特征在于, 包括: 接收用于关闭指定应用屏幕的指令;
截取所述指定应用屏幕的指定区域, 得到指定区域截图;
保存所述指定区域截图, 关闭所述指定应用屏幕。
2、 根据权利要求 1所述的方法, 其特征在于, 截取所述指定应用屏幕的指 定区域, 得到指定区域截图, 具体包括:
根据本地显示屏尺寸和预设缩放比例,将所述指定应用屏幕的指定区域进 行缩放, 并截取所述缩放后的缩略图, 得到指定区域截图。
3、 根据权利要求 1或 2所述的方法, 其特征在于, 保存所述指定区域截图, 关闭所述指定应用屏幕, 之后包括:
当接收到查看所述指定应用的指令时, 获取所述指定区域截图, 并显示所 述指定区域截图。
4、 根据权利要求 1-3任一项所述的方法, 其特征在于, 所述用于关闭指定 应用屏幕的指令为将所述指定应用切换至后台运行的切换指令,或将另一应用 切换至前台运行的切换指令, 或关闭所述指定应用的关闭指令。
5、 一种用于移动终端的应用屏幕截图装置, 其特征在于, 包括: 接收模块, 用于接收用于关闭指定应用屏幕的指令;
截图模块, 用于截取所述指定应用屏幕的指定区域, 得到指定区域截图; 保存模块, 用于保存所述指定区域截图, 关闭所述指定应用屏幕。
6、 根据权利要求 5所述的装置, 其特征在于, 所述截图模块包括: 缩放单元, 用于根据本地显示屏尺寸和预设缩放比例,将所述指定应用屏 幕的指定区域进行缩放;
截图单元, 用于截取所述缩放后的缩略图, 得到指定区域截图。
7、 根据权利要求 5或 6所述的装置, 其特征在于, 所述装置还包括: 显示模块, 用于当接收到查看所述指定应用的指令时, 获取所述指定区域 截图, 并显示所述指定区域截图。
8、 根据权利要求 5-7任一项所述的装置, 其特征在于, 所述用于关闭指定 应用屏幕的指令为将所述指定应用切换至后台运行的切换指令,或将另一应用 切换至前台运行的切换指令, 或关闭所述指定应用的关闭指令。
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