11

我试过了 :

process = Runtime.getRuntime().exec("su -c cat /dev/graphics/fb0 > /sdcard/frame.raw");
process.waitFor();

但它不起作用。我的设备已植根。

我看到很多答案,它需要根访问,但没有实际代码来获取帧缓冲区。

我也试过 glReadPixels() 但没有运气。

public void TakeScreen() {

        DisplayMetrics dm = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(dm);
        int width = dm.widthPixels;
        int height = dm.heightPixels;

        int screenshotSize = width * height;
        ByteBuffer bb = ByteBuffer.allocateDirect(screenshotSize * 4);
        bb.order(ByteOrder.nativeOrder());
        gl.glReadPixels(0, 0, width, height, GL10.GL_RGBA,
                GL10.GL_UNSIGNED_BYTE, bb);
        int pixelsBuffer[] = new int[screenshotSize];
        bb.asIntBuffer().get(pixelsBuffer);
        bb = null;
        Bitmap bitmap = Bitmap.createBitmap(width, height,
                Bitmap.Config.RGB_565);
        bitmap.setPixels(pixelsBuffer, screenshotSize - width, -width, 0, 0,
                width, height);
        pixelsBuffer = null;

        short sBuffer[] = new short[screenshotSize];
        ShortBuffer sb = ShortBuffer.wrap(sBuffer);
        bitmap.copyPixelsToBuffer(sb);

        for (int i = 0; i < screenshotSize; ++i) {
            short v = sBuffer[i];
            sBuffer[i] = (short) (((v & 0x1f) << 11) | (v & 0x7e0) | ((v & 0xf800) >> 11));
        }
        sb.rewind();
        bitmap.copyPixelsFromBuffer(sb);
        saveBitmap(bitmap, "/screenshots", "capturedImage");
    }
4

2 回答 2

0

答案在于复制设备本身处理它的方式:

fb = open("/dev/graphics/fb0", O_RDONLY);

检查这个

于 2011-08-07T02:08:56.777 回答
0

在我看来,你的问题是这个标志:>。您不能使用 重定向输出exec。您需要做的是获取进程的输出流(这是您的输入流)并将其存储到文件中;

process = Runtime.getRuntime().exec("su -c cat /dev/graphics/fb0");
InputStream is = process.getInputStream();
...
于 2011-08-07T02:30:03.670 回答