android后台获取当前屏幕截图（screencap.cpp修改）

Android屏幕截图技术解析

最新推荐文章于 2025-10-04 11:29:36 发布

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最新推荐文章于 2025-10-04 11:29:36 发布 · 7.4k 阅读

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#android #adb命令使用 #android截屏 #screencap修改

本文基于android6.0。首先找到screencap在Android源码中的位置，若不清楚，可以通过在android目录下通过命令find . -namescreencap.cpp。本文直接给出路径/android/frameworks/base/cmds/screencap/screencap.cpp。入口函数为main，只要编译就可以直接使用。如果需要将数据传出来，需要利用socket，后面会更新，将当前屏幕信息实时传输到web端显示。（data->data(), data->size()是需求的数据和大小）。

screencap.cpp源码如下：

<pre name="code" class="cpp">/*
 * Copyright (C) 2010 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <errno.h>
#include <unistd.h>
#include <stdio.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>

#include <linux/fb.h>
#include <sys/ioctl.h>
#include <sys/mman.h>

#include <binder/ProcessState.h>

#include <gui/SurfaceComposerClient.h>
#include <gui/ISurfaceComposer.h>

#include <ui/DisplayInfo.h>
#include <ui/PixelFormat.h>

// TODO: Fix Skia.
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wunused-parameter"
#include <SkImageEncoder.h>
#include <SkData.h>
#pragma GCC diagnostic pop

using namespace android;

static uint32_t DEFAULT_DISPLAY_ID = ISurfaceComposer::eDisplayIdMain;//eDisplayIdMain = 0

static void usage(const char* pname)
{
    fprintf(stderr,
            "usage: %s [-hp] [-d display-id] [FILENAME]\n"
            "   -h: this message\n"
            "   -