如何将字符串传递给 Beacon alte

Question

我复制并编辑了这段代码，以便通过 ALTEBeacon 传递字符串，但我只能看到两个字符，例如 String name = "Paulo" 而我只能看到 "Pa"。我不懂为什么。我用了这个方法代码。

 if (Build.VERSION.SDK_INT >= 21) {
        // Call some material design APIs here
        device.setText("supported");
        // new code
        String stringToTransmit = "Paulo";
        byte[] stringToTransmitAsAsciiBytes = stringToTransmit.getBytes(StandardCharsets.US_ASCII);
        Beacon beacon = new Beacon.Builder()
                .setId1(MY_MATCHING_IDENTIFIER.toString())
                .setId2(Identifier.fromBytes(stringToTransmitAsAsciiBytes, 0, 5, false).toString())
                .setId3("2")
                .setManufacturer(0x0118)
                .setTxPower(-59)
                .setDataFields(Arrays.asList(new Long[] {255l}))
                .setBluetoothName(Identifier.fromBytes(stringToTransmitAsAsciiBytes, 0, 5, false).toString())
                .build();

               BeaconParser beaconParser = new BeaconParser()
                .setBeaconLayout("m:2-3=beac,i:4-19,i:20-21,i:22-23,p:24-24,d:25-25");
        BeaconTransmitter beaconTransmitter = new BeaconTransmitter(getActivity(), beaconParser);

        beaconTransmitter.startAdvertising(beacon);
    }

我用这段代码恢复了

for (Beacon b:beacons) {
                    //new

                        String receivedString = null;

                       // byte[] bytes = b.getId2().toByteArray();
                       byte[] bytes = b.getId2().toByteArray();
                        receivedString = null;

                        try {
                            receivedString = new String(bytes, 0, bytes.length, "ASCII");


                        } catch (UnsupportedEncodingException e) {
                            e.printStackTrace();
                        }

}

Answer 1

代码尝试将字符串 "Paulo" 存储到 AltBeacon Id2 字段中。问题在于 ASCII 编码对每个字符使用一个字节，而 Id2 字段只有两个字节长。因此，该字段只能容纳两个字符。这就是您只看到 "Pa" 的原因。

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