Android:每秒更新一次蓝牙rssi [英] Android: Update bluetooth rssi every second

问题描述

我正在尝试从检测到的设备显示每秒的蓝牙信号强度(rssi)(Timer())，但是我无法多次调用onRecive()，因为

I'm trying to display the bluetooth signal strength (rssi) evry second (Timer()) from detected device but i couldn't call onRecive() multiple times because Receiver Lifecycle.

我需要一种刷新RSSI的方法(想法)，或者每秒其他一种测量信号的方法? 连接设备会更容易吗?

I need a way(idea) to refresh the RSSI, or some other way to measure a signal every second? Is it easier if the device is connected?

应用始终提供恒定值:

DeviceName 2b:3c:d5:6c:3x:0X 40 db

DeviceName 2b:3c:d5:6c:3x:0X 40 db

以Timer()方法存储的部分应用程序:

Part of the app stored in Timer() method:

    BroadcastReceiver mReceiver = new BroadcastReceiver() {
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        // When discovery finds a device
        if (BluetoothDevice.ACTION_FOUND.equals(action)) {
            // Get the BluetoothDevice object from the Intent
            BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
            short rssi = intent.getShortExtra(BluetoothDevice.EXTRA_RSSI,Short.MIN_VALUE);
            // Add the name and address to an array adapter to show in a ListView

           msg = device.getName() + " " + device.getAddress() + " " +rssi+ " db";

        }

}};

推荐答案

您只能在设备发现扫描期间获取RSSI值. (蓝牙发现与连接)

You can only get the RSSI value during a device discovery scan. (Bluetooth Discovery vs Connection)

连接设备是否容易?"因此，与android docs: 如果已经与设备建立了连接，那么执行发现操作会大大减少可用于该连接的带宽，因此在连接时不应执行发现操作."

"Is it easier if the device is connected?" Accordingly with android docs: "if you already hold a connection with a device, then performing discovery can significantly reduce the bandwidth available for the connection, so you should not perform discovery while connected."

您真的需要每1秒执行一次查询吗?会消耗大量的电池...

Do you really need to perform an inquiry every 1 second? Will consume a lot of battery...

由于需要定期执行测量，为什么不使用AlarmManager或CountDownTimer?

Since you need to perform the measure periodically, why not use AlarmManager or CountDownTimer?

在您的特定情况下，我相信您应该使用AlarmManager，因为它可以无限期地重复.例如，如果要每秒执行某件事10秒钟，请使用CountDownTimer.

In your specific case, I believe you should be using AlarmManager, since it can repeat indefinitely. If you want something to execute every second for 10 seconds, for example, use CountDownTimer.

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