為什麼我的手機不支援 BLE

来源：互联网发布：arm linux gnu gcc 编辑：程序博客网时间：2024/05/22 13:45

1. This line returns failed:

mContext.getPackageManager().hasSystemFeature(

PackageManager.FEATURE_BLUETOOTH_LE)

Your device must have the file in file system to support BLUETOOTH,

/etc/handheld_core_hardware.xml
<feature name="android.hardware.bluetooth" />
and have this file to support BLE

/etc/android.hardware.bluetooth_le.xml

<feature name="android.hardware.bluetooth_le" />
Unfortunately, my ASUS Zenfone 5 doesn't have the file android.hardware.bluetooth_le.xml, so the feature is missing.

2. Even I ignore FEATURE_BLUETOOTH_LE, I still don't get BLE functions.

We get BluetoothManager from SystemService.

BluetoothManager bluetoothManager =
(BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);

In BluetoothAdapter.java

IBluetoothGatt iGatt = mManagerService.getBluetoothGatt();

we got iGatt == null, which means the BluetoothManager doesn't contain IBluetoothGatt.

In BluetoothManagerService.java

private void bluetoothStateChangeHandler(int prevState, int newState) {

......

if (mContext.getPackageManager().hasSystemFeature(
                                                     PackageManager.FEATURE_BLUETOOTH_LE)) {
                        Intent i = new Intent(IBluetoothGatt.class.getName());
                        doBind(i, mConnection, Context.BIND_AUTO_CREATE, UserHandle.CURRENT);
                    }

It doesn't bind to the GattService, so it cannot use Ble functions.

3. Can we use normal BT API to connect BLE device?

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