private void updateShowSeconds() { if (mShowSeconds) { // Wait until we have a display to start trying to show seconds. if (mSecondsHandler == null && getDisplay() != null) { mSecondsHandler = new Handler(); if (getDisplay().getState() == Display.STATE_ON) { mSecondsHandler.postAtTime(mSecondTick, SystemClock.uptimeMillis() / 1000 * 1000 + 1000); } IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_OFF); filter.addAction(Intent.ACTION_SCREEN_ON); mContext.registerReceiver(mScreenReceiver, filter); } } else { if (mSecondsHandler != null) { mContext.unregisterReceiver(mScreenReceiver); mSecondsHandler.removeCallbacks(mSecondTick); mSecondsHandler = null; updateClock(); } } } private final BroadcastReceiver mScreenReceiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { String action = intent.getAction(); if (Intent.ACTION_SCREEN_OFF.equals(action)) { if (mSecondsHandler != null) { mSecondsHandler.removeCallbacks(mSecondTick); } } else if (Intent.ACTION_SCREEN_ON.equals(action)) { if (mSecondsHandler != null) { mSecondsHandler.postAtTime(mSecondTick, SystemClock.uptimeMillis() / 1000 * 1000 + 1000); } } } }; private final Runnable mSecondTick = new Runnable() { @Override public void run() { if (mCalendar != null) { updateClock(); } mSecondsHandler.postAtTime(this, SystemClock.uptimeMillis() / 1000 * 1000 + 1000); } }; } Android4.4编译报错getDisplay().getState(

根据您提供的代码，可能是因为在Android4.4中没有`getDisplay().getState()`这个方法而导致编译报错。可以尝试使用`getSystemService(Context.WINDOW_SERVICE).getDefaultDisplay().getState()`来获取屏幕状态。请修改代码如下：

private void updateShowSeconds() {
    if (mShowSeconds) {
        // Wait until we have a display to start trying to show seconds.
        if (mSecondsHandler == null && getSystemService(Context.WINDOW_SERVICE).getDefaultDisplay() != null) {
            mSecondsHandler = new Handler();
            if (getSystemService(Context.WINDOW_SERVICE).getDefaultDisplay().getState() == Display.STATE_ON) {
                mSecondsHandler.postAtTime(mSecondTick, SystemClock.uptimeMillis() / 1000 * 1000 + 1000);
            }
            IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_OFF);
            filter.addAction(Intent.ACTION_SCREEN_ON);
            mContext.registerReceiver(mScreenReceiver, filter);
        }
    } else {
        if (mSecondsHandler != null) {
            mContext.unregisterReceiver(mScreenReceiver);
            mSecondsHandler.removeCallbacks(mSecondTick);
            mSecondsHandler = null;
            updateClock();
        }
    }
}

private final BroadcastReceiver mScreenReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        if (Intent.ACTION_SCREEN_OFF.equals(action)) {
            if (mSecondsHandler != null) {
                mSecondsHandler.removeCallbacks(mSecondTick);
            }
        } else if (Intent.ACTION_SCREEN_ON.equals(action)) {
            if (mSecondsHandler != null) {
                mSecondsHandler.postAtTime(mSecondTick, SystemClock.uptimeMillis() / 1000 * 1000 + 1000);
            }
        }
    }
};

private final Runnable mSecondTick = new Runnable() {
    @Override
    public void run() {
        if (mCalendar != null) {
            updateClock();
        }
        mSecondsHandler.postAtTime(this, SystemClock.uptimeMillis() / 1000 * 1000 + 1000);
    }
};