Android(安卓)TV热键(快捷键、组合键)实现

TV上一些特殊的功能入口、串口打印开关、adb调试开关、部分菜单的显示隐藏等都可以通过热键来控制。

一般组合键选用某个功能键+一串数字即可，我们可以将其封装成工具类，这里快捷键，我使用F1和几个数字键组合。

public class SpecialKey implements Constants {    private static SpecialKey instance = null;    private Context mContext;    private SpecialKeyCallBack mSpecialKeyCallBack;    private StringBuffer strBuffer;    private boolean hasSpecialKeyCode = true;    private SpecialKey(Context context) {        mContext = context;        initData();    }    public synchronized static SpecialKey getInstance(Context context) {        if (instance == null) {            instance = new SpecialKey(context);        }        return instance;    }    private void initData() {        strBuffer = new StringBuffer();        strBuffer.setLength(0);    }    public void setInputKeyNumber(int keyCode, KeyEvent event) {        int iDigital;        switch (keyCode) {            case KEY_0:                iDigital = 0;                break;            case KEY_1:                iDigital = 1;                break;            case KEY_2:                iDigital = 2;                break;            case KEY_3:                iDigital = 3;                break;            case KEY_4:                iDigital = 4;                break;            case KEY_5:                iDigital = 5;                break;            case KEY_6:                iDigital = 6;                break;            case KEY_7:                iDigital = 7;                break;            case KEY_8:                iDigital = 8;                break;            case KEY_9:                iDigital = 9;                break;            default:                iDigital = -1;                break;        }        if (iDigital != -1) {            strBuffer.append(String.valueOf(iDigital));            setSpecialMenu(strBuffer);        }    }    private void setSpecialMenu(StringBuffer strBuffer) {        int iNumber = Integer.parseInt(strBuffer.toString());        switch (iNumber) {            case 000:                // patch_enable                break;            case 111:                // show uart    break;            case 222:                // show SDSMenu                break;            case 333:                // ChangeLauncher();                break;            case 987:                // updateNetUpdateEnableStatus();                break;            case 135:                break;            case 789:                // PowerReboot                break;            case 8280:                break;            case 12500:                // adb switcher                break;            case 12459:                // print switcher                break;            case 8281:                // PatchMenu                break;            case 234:                // sendPVRRecTP();                break;            default:                hasSpecialKeyCode = false;                break;        }        setDataClear();    }    public void setDataClear() {        strBuffer.setLength(0);        if (mSpecialKeyCallBack != null) {            mSpecialKeyCallBack.onChangeSpecialKeyStatus(false);            mSpecialKeyCallBack.dismissNoChannelDLG(hasSpecialKeyCode);            hasSpecialKeyCode = true;        }    }    public void setSpecialKeyListener(SpecialKeyCallBack finish) {        this.mSpecialKeyCallBack = finish;    }    public interface SpecialKeyCallBack {        void onChangeSpecialKeyStatus(boolean status);        void dismissNoChannelDLG(boolean isDismiss);    }}

如何使用呢？一般，我们在电视应用主界面调用上面的工具类

步骤1：重写主界面Activity的onKeyDown()方法，将数字按键事件封装成一个方法，如果是F1按键，则实例化上述的热键工具类，并使用Handler发送一个热键消息。

    @Override    public boolean onKeyDown(int keyCode, KeyEvent event) {        if (onChangePIPKey(keyCode, event)) {            return true;        }        if (onChangePVRKey(keyCode, event)) {            return true;        }        if (isNumberKeyDown(keyCode, event)) {            return true;        }        switch (keyCode) {            case KEY_F1:                Log.d(CLASS_NAME, "bSpecialKey = " + bSpecialKey);                if (!bSpecialKey) {                    bSpecialKey = true;                    mSpecialKey = SpecialKey.getInstance(HomeActivity.this);                    mSpecialKey.setSpecialKeyListener(this);                    if (handler.hasMessages(RESPONSE_SPECIAL_KEY_DOWN)) {                        handler.removeMessages(RESPONSE_SPECIAL_KEY_DOWN);                    }                    handler.sendEmptyMessageDelayed(RESPONSE_SPECIAL_KEY_DOWN, 5000);                } else {                }                break;            default:                break;        }        Log.d(CLASS_NAME, " " + event.getAction());        return super.onKeyDown(keyCode, event);    }

步骤二：在数字按键处理函数中，如果需要处理热键，则将数字按键事件交给热键工具类的setInputKeyNumber()方法处理，否则将该事件还给主界面。

    private boolean isNumberKeyDown(int keyCode, KeyEvent event) {        switch (keyCode) {            case KEY_0:            case KEY_1:            case KEY_2:            case KEY_3:            case KEY_4:            case KEY_5:            case KEY_6:            case KEY_7:            case KEY_8:            case KEY_9:                if (bSpecialKey) {                    mSpecialKey.setInputKeyNumber(keyCode, event);                } else {                    numberKeyDown(keyCode, event);                }                return true;            default:                break;        }        return false;    }

步骤3：处理热键消息，实现Handler.Callback的handleMessage()方法。

    @Override    public boolean handleMessage(Message msg) {        switch (msg.what) {            case RESPONSE_POWER_ACTION:                // handle power key                break;            case RESPONSE_SPECIAL_KEY_DOWN:                if (bSpecialKey) {                    bSpecialKey = false;                    mSpecialKey.setDataClear();                }                break;            default:                break;        }        return false;    }

步骤4：主界面实现SpecialKeyCallBack两个回调方法。

    @Override    public void onChangeSpecialKeyStatus(boolean status) {        bSpecialKey = status;    }    @Override    public void dismissNoChannelDLG(boolean isDismiss) {        if (isDismiss) {            dismissDialogInner(NO_CHANNEL_DLG);            isNoChannelDLGDismiss = isDismiss;        }    }

bSpecialKey这个变量用于判断是否需要处理热键，初始化置为false.

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