问题描述
我正在尝试使用BLE
查找两个Android设备之间的距离,在Scancallback中查找距离,我需要两个值,即RSSI
和TxPower
。我得到RSSI
,但无法得到TxPower
我正在使用double distance = Math.pow(10d,(txpower - (rssi)) / (10 * 4));
这个公式
private ScanCallback mScanCallback = new ScanCallback() {
@Override
public void onScanResult(int callbackType,ScanResult result) {
System.out.println("BLE// onScanResult");
Log.i("callbackType",String.valueOf(callbackType));
Log.i("result",result.toString());
BluetoothDevice btDevice = result.getDevice();
Integer rssi = result.getRssi();
Integer txpower = result.getTxPower();
// I am getting txpower = 127 which means txpower not avaliable in packet
double distance = Math.pow(10d,(txpower - (rssi)) / (10 * 4));
}
@Override
public void onBatchScanResults(List <ScanResult> results) {
System.out.println("BLE// onBatchScanResults");
for (ScanResult sr: results) {
Log.i("ScanResult - Results",sr.toString());
}
}
@Override
public void onScanFailed(int errorCode) {
System.out.println("BLE// onScanFailed");
Log.e("Scan Failed","Error Code: " + errorCode);
}
};
解决方法
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