android下截屏

最新推荐文章于 2024-05-30 22:41:26 发布

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最新推荐文章于 2024-05-30 22:41:26 发布

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本文将指导您如何在运行Gingerbread或更高版本的Android设备上通过adb命令拉取libsurfaceflinger_client.so文件以获取屏幕截图，并解释了在ICS或JB中使用ScreenshotClient类的原理。此外，文章还提供了关于如何在代码中调用此功能的详细步骤，并讨论了获取屏幕截图时可能遇到的权限限制。

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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。