java - 使用java获取其他程序的 Activity 窗口

Question

我正在尝试制作一个Java应用程序，它可以从其他 Activity 窗口程序获取信息，例如信息栏，甚至其他 Activity 窗口的屏幕截图。

在这种情况下 JNI 是唯一的选择吗？

谢谢。

Answer 1

您可以使用以下代码并能够检索激活窗口的屏幕截图。

此外， 要捕获更好裁剪的窗口图像，请根据需要调整以下变量

private static int adjustLeft = 6;
private static int fineCutterX = 6;
private static int fineCutterY = 6;

public void getActiveWindowImage() {
    char[] buffer = new char[MAX_TITLE_LENGTH * 2];
    HWND hwnd = User32.INSTANCE.GetForegroundWindow();
    User32.INSTANCE.GetWindowText(hwnd, buffer, MAX_TITLE_LENGTH);
    System.out.println("Active window title: " + Native.toString(buffer));
    RECT rect = new RECT();
    User32.INSTANCE.GetWindowRect(hwnd, rect);
    int x = rect.left + adgustLeft;
    int y = rect.top;
    int width = rect.right - x - fineCutterX;
    int hieght = rect.bottom - y - fineCutterY;
    System.out.println(x + "," + y + "," + width + "," + hieght);
    System.out.println("rect = " + rect);

    Robot robot = null;
    try {
        robot = new Robot();
    } catch (AWTException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    // Capture the screen shot of the area of the screen defined by the rectangle
    BufferedImage bi = robot.createScreenCapture(new Rectangle(x, y, width, hieght));
    try {
        ImageIO.write(bi, "jpg", new File("<File Path you need to save>"));
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}