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android下截屏

2014年01月14日 ⁄ 综合 ⁄ 共 1404字 ⁄ 字号 评论关闭

he library you need is called libsurfaceflinger_client.so. You can pull it from any device running Gingerbread or
higher
 version of Android, with command

adb pull /system/lib/libsurfaceflinger_client.so

On ICS or JB, class ScreenshotClient is part of libgui.so.
The makefile for screencap which is the example of using ScreenshotClient, suggests that linker may need other libraries:

libcutils libutils libbinder libskia libui libgui

Also, the code of screencap.cpp goes
as follows:

ScreenshotClient screenshot;
if (screenshot.update() == NO_ERROR) {
    base = screenshot.getPixels();
    w = screenshot.getWidth();
    h = screenshot.getHeight();
    f = screenshot.getFormat();
    size = screenshot.getSize();
} else {
    const char* fbpath = "/dev/graphics/fb0";
    int fb = open(fbpath, O_RDONLY);
    if (fb >= 0) {
        struct fb_var_screeninfo vinfo;
        if (ioctl(fb, FBIOGET_VSCREENINFO, &vinfo) == 0) {
...

This means that at least you must check that update() succeed. Unfortunately, unless teh device is rooted, the apps cannot be granted permission to read from /dev/graphics/fb0 and
use the fallback of /system/bin/screencap or /system/bin/screenshot.

================================sno测试:

130|root@android:/ # screencap --help                                          
unknown option -- -usage: screencap [-hp] [-d display-id] [FILENAME]
   -h: this message
   -p: save the file as a png.
   -d: specify the display id to capture, default 0.
If FILENAME ends with .png it will be saved as a png.
If FILENAME is not given, the results will be printed to stdout.
1|root@android:/ # screencap -p testcap.png  ///《----------------------------------这里可以截图。

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