Question

我的android studio在清单中有蓝牙权限，这是我的代码：

private BluetoothManager bluetoothManager;
private BluetoothAdapter mBluetoothAdapter;
private static final int REQUEST_ENABLE_BT = 1;
private static final long SCAN_PERIOD = 1000000; //10 seconds 搜尋頻率 1S:1000
private Handler mHandler;

private NotificationManager notificationManager;
Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    //推播接收媒介
    mHandler = new Handler();
    bluetoothManager = (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);
    mBluetoothAdapter = bluetoothManager.getAdapter();

    //檢查是否支援藍芽
    if (!getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH_LE)) {
        Toast.makeText(this, "硬體不支援", Toast.LENGTH_SHORT).show();
    }
    // 檢查手機是否開啟藍芽裝置
    if (mBluetoothAdapter == null || !mBluetoothAdapter.isEnabled()) {
        Toast.makeText(this, "請開啟藍芽裝置", Toast.LENGTH_SHORT).show();
        Intent enableBluetooth = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
        startActivityForResult(enableBluetooth, REQUEST_ENABLE_BT);
    } else {
        scanLeDevice(true);
    }
};
@Override
protected void onPause() {
    super.onPause();
    scanLeDevice(false);
}
private void scanLeDevice(final boolean enable) {
    if (enable) {
        mHandler.postDelayed(new Runnable() {
            @Override
            public void run() {
                mBluetoothAdapter.stopLeScan(mLeScanCallback);
            }
        }, SCAN_PERIOD);

        mBluetoothAdapter.startLeScan(mLeScanCallback);
    } else {
        mBluetoothAdapter.stopLeScan(mLeScanCallback);
    }
}
private BluetoothAdapter.LeScanCallback mLeScanCallback = new BluetoothAdapter.LeScanCallback() {
            @Override
            public void onLeScan(final BluetoothDevice device, final int rssi, final byte[] scanRecord) {
                    //判斷是否有重新申請推播的必要
                    //BEACON 取其名稱

                notificationManager.cancelAll();//清理舊的通知資料
                prb=device.getName().toString();
                noti.addJavascriptInterface(new JsOperation(),"test1");
            }
            };
};

我测试了mBluetoothAdapter.startLeScan（mLeScanCallback）;, 结果是真的，但不能进入onLeScan，我很确定BLE设备有标志。请帮帮我。

Answer 1

除了android.permission.BLUETOOTH之外，你还需要清单中的android.permission.ACCESS_COARSE_LOCATION。确保使用权限API提示用户获取BLUETOOTH权限。

在发现设备之前，您的代码不会进入aria-hidden="true"。使用nRF Connect验证您周围是否有可发现的蓝牙LE设备。

蓝牙LeScan没有达到目标

1 个答案: