通知栏上的蓝牙配对请求？

Hey everyone!

在Android之前开始使用蓝牙编程 . 但现在我遇到了一些问题 . 我想知道为什么配对请求有时会出现在通知栏中，有时会跳过此对话框并直接显示对话框 .

例如：我从嵌入式设备发起配对请求，然后会出现如下通知：

And sometimes I don't have to bother with the notification, my dialog just shows up as I intended it to be.

Is there way to catch that notification and display the dialog or is this a bug in my code when I initiate bluetooth pairing?

EDIT:

UPDATE 1:

检查了Reno给我的答案，这实际上取决于各种各样的事情 . 还有其他方法可以直接显示对话框 . 当配对请求到达时，调用以下方法 . 进行检查以查看对话框是应该显示在前台（true）还是显示为通知（false）：

public boolean shouldShowDialogInForeground(String deviceAddress) {
    // If Bluetooth Settings is visible
    if (mForegroundActivity != null) return true;

    long currentTimeMillis = System.currentTimeMillis();
    SharedPreferences sharedPreferences = getSharedPreferences();

    // If the device was in discoverABLE mode recently
    long lastDiscoverableEndTime = sharedPreferences.getLong(
            BluetoothDiscoverableEnabler.SHARED_PREFERENCES_KEY_DISCOVERABLE_END_TIMESTAMP, 0);
    if ((lastDiscoverableEndTime + GRACE_PERIOD_TO_SHOW_DIALOGS_IN_FOREGROUND)
            > currentTimeMillis) {
        return true;
    }

    // If the device was discoverING recently
    if (mAdapter != null && mAdapter.isDiscovering()) {
        return true;
    } else if ((sharedPreferences.getLong(SHARED_PREFERENCES_KEY_DISCOVERING_TIMESTAMP, 0) +
            GRACE_PERIOD_TO_SHOW_DIALOGS_IN_FOREGROUND) > currentTimeMillis) {
        return true;
    }

    // If the device was picked in the device picker recently
    if (deviceAddress != null) {
        String lastSelectedDevice = sharedPreferences.getString(
                SHARED_PREFERENCES_KEY_LAST_SELECTED_DEVICE, null);

        if (deviceAddress.equals(lastSelectedDevice)) {
            long lastDeviceSelectedTime = sharedPreferences.getLong(
                    SHARED_PREFERENCES_KEY_LAST_SELECTED_DEVICE_TIME, 0);
            if ((lastDeviceSelectedTime + GRACE_PERIOD_TO_SHOW_DIALOGS_IN_FOREGROUND)
                    > currentTimeMillis) {
                return true;
            }
        }
    }
    return false;
}

This is a snippet from the source code and as you can see that there are ways of making the dialog show:

• 如果设备最近处于可发现模式

• 如果设备最近发现了

• 如果最近在设备选择器中选择了设备

• 如果可以看到蓝牙设置