安卓。将android电视机箱从遥控器中遥控

Question

你已经很清楚地看到了市场上那些非常便宜的安卓电视机箱。它们的后面通常有一个遥控器，它具有一些功能，如点击、滑动或向左、向右上下滑动。

最近，我制作了一个应用程序，并试图使用遥控器导航它。我在这个项目中有一些手势方法。我试着向左和右滑动，但是当我在有屏幕的手机上尝试时，这个应用没有做任何事情，得到了这个手势，并做了它应该做的事情。比如打开导航抽屉等。

现在我的问题是:是否需要使用特殊的方法？有什么规则值得注意吗？

编辑，，这就是我到目前为止所做的。我创建了一个定义操作的类:它来自google.developer

    public class Dpad {
        public final static int UP = 0;
        public final static int LEFT = 1;
        public final static int RIGHT = 2;
        public final static int DOWN = 3;
        public final static int CENTER = 4;

        int directionPressed = -1; // initialized to -1

        public int getDirectionPressed(InputEvent event) {
            if (!isDpadDevice(event)) {
                return -1;
            }

            // If the input event is a MotionEvent, check its hat axis values.
            if (event instanceof MotionEvent) {

                // Use the hat axis value to find the D-pad direction
                MotionEvent motionEvent = (MotionEvent) event;
                float xaxis = motionEvent.getAxisValue(MotionEvent.AXIS_HAT_X);
                float yaxis = motionEvent.getAxisValue(MotionEvent.AXIS_HAT_Y);

                // Check if the AXIS_HAT_X value is -1 or 1, and set the D-pad
                // LEFT and RIGHT direction accordingly.
                if (Float.compare(xaxis, -1.0f) == 0) {
                    directionPressed = Dpad.LEFT;
                } else if (Float.compare(xaxis, 1.0f) == 0) {
                    directionPressed = Dpad.RIGHT;
                }
                // Check if the AXIS_HAT_Y value is -1 or 1, and set the D-pad
                // UP and DOWN direction accordingly.
                else if (Float.compare(yaxis, -1.0f) == 0) {
                    directionPressed = Dpad.UP;
                } else if (Float.compare(yaxis, 1.0f) == 0) {
                    directionPressed = Dpad.DOWN;
                }
            }

            // If the input event is a KeyEvent, check its key code.
            else if (event instanceof KeyEvent) {

                // Use the key code to find the D-pad direction.
                KeyEvent keyEvent = (KeyEvent) event;
                if (keyEvent.getKeyCode() == KeyEvent.KEYCODE_DPAD_LEFT) {
                    directionPressed = Dpad.LEFT;
                } else if (keyEvent.getKeyCode() == KeyEvent.KEYCODE_DPAD_RIGHT) {
                    directionPressed = Dpad.RIGHT;
                } else if (keyEvent.getKeyCode() == KeyEvent.KEYCODE_DPAD_UP) {
                    directionPressed = Dpad.UP;
                } else if (keyEvent.getKeyCode() == KeyEvent.KEYCODE_DPAD_DOWN) {
                    directionPressed = Dpad.DOWN;
                } else if (keyEvent.getKeyCode() == KeyEvent.KEYCODE_DPAD_CENTER) {
                    directionPressed = Dpad.CENTER;
                }
            }
            return directionPressed;
        }

        public static boolean isDpadDevice(InputEvent event) {
            // Check that input comes from a device with directional pads.
            if ((event.getSource() & InputDevice.SOURCE_DPAD)
                    != InputDevice.SOURCE_DPAD) {
                return true;
            } else {
                return false;
            }
        }
    }

在我的MainActivity里我有一个导航抽屉。当远程控制D-pad想要的时候，我想打开和关闭

 mDrawerLayout.setOnGenericMotionListener(new View.OnGenericMotionListener() {
        @Override
        public boolean onGenericMotion(View view, MotionEvent motionEvent) {
            if (Dpad.isDpadDevice(motionEvent)) {
                int press = mDpad.getDirectionPressed(motionEvent);
                switch (press) {
                    case Dpad.RIGHT:
                        // Do something for UP direction press Open the drawer
                        mDrawerLayout.openDrawer(Gravity.START);
                        return true;
                    case Dpad.LEFT:

                        mDrawerLayout.closeDrawer(Gravity.START);
                        return true;

                }
            }
            return false;
        }
    });

在其中一个片段中，我有一个媒体播放器，使用D向上和D向下，我改变了视频。

    v.setOnGenericMotionListener(new View.OnGenericMotionListener() {
        @Override
        public boolean onGenericMotion(View view, MotionEvent motionEvent) {
            if (Dpad.isDpadDevice(motionEvent)) {
                int press = mDpad.getDirectionPressed(motionEvent);
                switch (press) {
                    case Dpad.UP:
                        // Do something for UP direction press
                        UP(); // Change the video to next
                        return true;
                    case Dpad.DOWN:
                        DOWN(); // Change the video the earlier on
                        return true;

                }
            }

            return false;
        }
    });

编辑它现在成为一个问题，因为它不响应任何运动。我在一个带有物理键盘的仿真器上试了试，没有一个动作发生。如果有人给我暗示，我会同意的。我指的是下面图片中的这种遥控器

​

提前感谢

Answer 1

我认为Android开发人员的代码是错误的：

public static boolean isDpadDevice(InputEvent event) {
    // Check that input comes from a device with directional pads.
    if ((event.getSource() & InputDevice.SOURCE_DPAD)
         != InputDevice.SOURCE_DPAD) {
         return true;
     } else {
         return false;
     }
}

条件应该是"==“而不是"!="，因此这是正确的：

    public static boolean isDpadDevice(InputEvent event) {
    // Check that input comes from a device with directional pads.
    if ((event.getSource() & InputDevice.SOURCE_DPAD)
         == InputDevice.SOURCE_DPAD) {
         return true;
     } else {
         return false;
     }
 }