但是,在Android平台上做同样的事情我们遇到了很大的困难. (我们希望通过生根设备实现这一目标)

以下是我们的进展：

> Vuforia程序使相机失灵,我无法访问视频流.
>我尝试捕获每帧的screeshot,然后将它们组合成一些视频输出;但帧率很差(小于1 fps).拍摄屏幕截图需要700毫秒.

我是从错误的方向思考的吗？任何帮助将深表感谢！
非常感谢！
艾萨克

以下是我的测试代码：

public void acquireScreenshot() {
    DisplayMetrics metrics = new DisplayMetrics();
    WindowManager WM = (WindowManager) MainActivity.this.getSystemService(Context.WINDOW_SERVICE);
    Display display = WM.getDefaultDisplay();
    display.getMetrics(metrics);
    int height = metrics.heightPixels; // screen height
    int width = metrics.widthPixels; // screen width
    int pixelformat = display.getPixelFormat();
    PixelFormat localPixelFormat1 = new PixelFormat();
    PixelFormat.getPixelFormatInfo(pixelformat,localPixelFormat1);
    int deepth = localPixelFormat1.bytesPerPixel;

    byte[] arrayOfByte = new byte[height* width* deepth];
    long tmp = System.currentTimeMillis();
    try {
        for(int i = 0 ; i < 10 ; i++){
            InputStream localInputStream = readAsRoot();
            DataInputStream localDataInputStream = new DataInputStream(
                    localInputStream);
            android.util.Log.e("mytest","-----read start-------");
            localDataInputStream.readFully(arrayOfByte);
            android.util.Log.e("mytest","-----read end-------time = "  + (System.currentTimeMillis() -tmp ));
            localInputStream.close();

            File mid = new File("/mnt/sdcard/AAA");

            if(!mid.exists()){
                mid.mkdir();
            }

            FileOutputStream out = new FileOutputStream(new File(
                    "/mnt/sdcard/AAA/"+System.currentTimeMillis()+".png"));  
            int[] tmpColor = new int[width * height];
            int r,g,b;
            tmp = System.currentTimeMillis();
            android.util.Log.e("mytest","-----bitmap start-------");
            for (int j = 0; j < width * height * deepth; j+=deepth) {
                b = arrayOfByte[j]&0xff;
                g = arrayOfByte[j+1]&0xff;
                r = arrayOfByte[j+2]&0xff;
                tmpColor[j/deepth] = (r << 16) | (g << 8) | b |(0xff000000);
            }
            Bitmap tmpMap = Bitmap.createBitmap(tmpColor,width,height,Bitmap.Config.ARGB_8888);
            android.util.Log.e("mytest","-----bitmap end-------time = "  + (System.currentTimeMillis() -tmp ));

            tmp = System.currentTimeMillis();
            android.util.Log.e("mytest","-----compress start-------");
            tmpMap.compress(Bitmap.CompressFormat.PNG,100,out);
            android.util.Log.e("mytest","-----compress end-------time = "  + (System.currentTimeMillis() -tmp ));
            out.close();
            Thread.sleep(40);
        }


    } catch (Exception e) {
        android.util.Log.e("mytest","Exception");
        e.printStackTrace();
    }

}