Android TV开发之旅 二 遥控器按键

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https://zhuanlan.zhihu.com/p/34194412

手机开发中我们知道有如下几个函数，至于各位有没有用过，因项目需求而异。

boolean onKeyDown(int keyCode, KeyEvent event)
boolean onKeyUp(int keyCode, KeyEvent event)
boolean dispatchKeyEvent(KeyEvent event)
boolean onTouchEvent(MotionEvent ev)
boolean dispatchTouchEvent(MotionEvent ev)

当然手机中的不是我们这篇文章要说的。

Activity和View中都有这三个事件：

boolean onKeyDown(int keyCode, KeyEvent event)
boolean onKeyUp(int keyCode, KeyEvent event)
boolean dispatchKeyEvent(KeyEvent event)

---

下面开始说正文：

可以在Activity中通过onKeyDown获取遥控器按键对应的keyCode码,然后做对应的操作；

当然我们也可以在dispatchKeyEvent控制按键的分发，就像我们做手机app的时候一样，

事件拦截是同一个道理；

我们也可以针对view设置对于的onkeyDown,onKeyUp事件；

我写过一个RemoteControlKeyEvent，传入对于的keyCode获得对应的类型 ,

每个项目需求不同，需要稍作修改:

public class RemoteControlKeyEvent {
  /**
   * 直播
   */
  public static final int BTV = 1181;

  /**
   * 点播
   */
  public static final int VOD = 1182;

  /**
   * 回看
   */
  public static final int TVOD = 1184;

  /**
   * VOD快进
   */
  public static final int VOD_FAST_FORWARD = KeyEvent.KEYCODE_MEDIA_FAST_FORWARD;

  /**
   * VOD快退
   */
  public static final int VOD_FAST_REWIND = KeyEvent.KEYCODE_MEDIA_REWIND;

  /**
   * 媒体播放暂停
   */
  public static final int MEDIA_PAUSE_PLAY = KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE;

  /**
   * 频道+
   */
  public static final int CHANNEL_UP = KeyEvent.KEYCODE_CHANNEL_UP;

  /**
   * 频道-
   */
  public static final int CHANNEL_DOWN = KeyEvent.KEYCODE_CHANNEL_DOWN;

  /**
   * 在直播界面切换出Infoview菜单
   */
  public static final int CHANNEL_MENU = KeyEvent.KEYCODE_MENU;

  /**
   * 显示直播频道页
   */
  public static final int SHOW_EPGVIEW = KeyEvent.KEYCODE_DPAD_RIGHT;

  private static RemoteKeyEvent mKeyEvent;

  private ArrayMap<Integer, Integer> mBaseKeyCodeValue = new ArrayMap<>();

  private ArrayMap<Integer, Integer> mVODKeyCodeValue = new ArrayMap<>();

  private ArrayMap<Integer, Integer> mBTVKeyCodeValue = new ArrayMap<>();

  public int getKeyCodeValue(int code) {
    if (mBaseKeyCodeValue.containsKey(code)) {
      return mBaseKeyCodeValue.get(code);
    }
    return code;
  }

  public int getVODKeyCodeValue(int code) {
    if (mVODKeyCodeValue.containsKey(code)) {
      return mVODKeyCodeValue.get(code);
    }
    return code;
  }

  public int getBTVKeyCodeValue(int code) {
    if (mBTVKeyCodeValue.containsKey(code)) {
      return mBTVKeyCodeValue.get(code);
    }
    return code;
  }

  public static synchronized RemoteKeyEvent getInstance() {
    if (null == mKeyEvent) {
      mKeyEvent = new RemoteKeyEvent();
    }
    return mKeyEvent;
  }

  private RemoteKeyEvent() {
    //BTV 直播
    mBaseKeyCodeValue.put(BTV, BTV);
    mBaseKeyCodeValue.put(KeyEvent.KEYCODE_PROG_RED, BTV);

    //TVOD 回看
    mBaseKeyCodeValue.put(TVOD, TVOD);
    mBaseKeyCodeValue.put(KeyEvent.KEYCODE_PROG_GREEN, TVOD);

    //点播
    mBaseKeyCodeValue.put(VOD, VOD);
    mBaseKeyCodeValue.put(KeyEvent.KEYCODE_PROG_YELLOW, VOD);

    //0-9按键
    mBaseKeyCodeValue.put(KeyEvent.KEYCODE_0, 0);
    mBaseKeyCodeValue.put(KeyEvent.KEYCODE_1, 1);
    mBaseKeyCodeValue.put(KeyEvent.KEYCODE_2, 2);
    mBaseKeyCodeValue.put(KeyEvent.KEYCODE_3, 3);
    mBaseKeyCodeValue.put(KeyEvent.KEYCODE_4, 4);
    mBaseKeyCodeValue.put(KeyEvent.KEYCODE_5, 5);
    mBaseKeyCodeValue.put(KeyEvent.KEYCODE_6, 6);
    mBaseKeyCodeValue.put(KeyEvent.KEYCODE_7, 7);
    mBaseKeyCodeValue.put(KeyEvent.KEYCODE_8, 8);
    mBaseKeyCodeValue.put(KeyEvent.KEYCODE_9, 9);

    //VOD快进,快退
    mVODKeyCodeValue.put(KeyEvent.KEYCODE_DPAD_RIGHT, VOD_FAST_FORWARD);
    mVODKeyCodeValue.put(KeyEvent.KEYCODE_PAGE_DOWN, VOD_FAST_FORWARD);
    mVODKeyCodeValue.put(KeyEvent.KEYCODE_DPAD_LEFT, VOD_FAST_REWIND);
    mVODKeyCodeValue.put(KeyEvent.KEYCODE_PAGE_UP, VOD_FAST_REWIND);

    //VOD媒体播放暂停code
    mVODKeyCodeValue.put(KeyEvent.KEYCODE_DPAD_CENTER, MEDIA_PAUSE_PLAY);
    mVODKeyCodeValue.put(KeyEvent.KEYCODE_ENTER, MEDIA_PAUSE_PLAY);
    mVODKeyCodeValue.put(KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE, MEDIA_PAUSE_PLAY);

    //频道+
    mBTVKeyCodeValue.put(KeyEvent.KEYCODE_CHANNEL_UP, CHANNEL_UP);
    mBTVKeyCodeValue.put(KeyEvent.KEYCODE_DPAD_UP, CHANNEL_UP);

    //频道-
    mBTVKeyCodeValue.put(KeyEvent.KEYCODE_CHANNEL_DOWN, CHANNEL_DOWN);
    mBTVKeyCodeValue.put(KeyEvent.KEYCODE_DPAD_DOWN, CHANNEL_DOWN);

    //channel menu，项目需求,直播页点击DPAD_LEFT可以呼出菜单键
    mBTVKeyCodeValue.put(KeyEvent.KEYCODE_DPAD_LEFT, CHANNEL_MENU);
    mBTVKeyCodeValue.put(KeyEvent.KEYCODE_MENU, CHANNEL_MENU);

    //直播频道页
    mBTVKeyCodeValue.put(KeyEvent.KEYCODE_DPAD_RIGHT, SHOW_EPGVIEW);
  }
}

当然上面的代码因需求而异，在项目中针对自己项目进行测试过之后，在引入上面的类；

下面介绍遥控器：

遥控器不一样，遥控器可以学习嘛，有的机顶盒遥控器按键功能比较多，有的机顶盒遥控器按键很基础，和海外机顶盒遥控器差不多，现在好多机顶盒的遥控器都差不多了，小米盒子3c遥控器长的如下：

image
image

遥控器大概有上面两种分格的机顶盒遥控器;

在代码编写时，根据自身需求进行定制处理。

请各位等待第三篇....................

image.png