public void getDeviceName(ContentResolver resolver) {
    String deviceName = Settings.Global.getString(resolver, Settings.Global.DEVICE_NAME);
    if (deviceName == null) {
        deviceName = Build.MODEL;
    }
    return deviceName;
}

public void setDeviceName(String deviceName) {
    // 更新设备名称
    setSettingsGlobalDeviceName(deviceName);

    // 更新蓝牙设备名称
    setBluetoothDeviceName(deviceName);

    // 更新热点名称，设备作为WIFI热点时SSID名称
    setTetherSsidName(deviceName);
}

private void setSettingsGlobalDeviceName(String deviceName) {
    Settings.Global.putString(mContext.getContentResolver(), Settings.Global.DEVICE_NAME,
            deviceName);
}

private void setBluetoothDeviceName(String deviceName) {
    if (mBluetoothAdapter != null) {
        mBluetoothAdapter.setName(getFilteredBluetoothString(deviceName));
    }
}

/**
 * Using a UTF8ByteLengthFilter, we can filter a string to be compliant with the Bluetooth spec.
 * For more information, see {@link com.android.settings.bluetooth.BluetoothNameDialogFragment}.
 */
private static final String getFilteredBluetoothString(final String deviceName) {
    CharSequence filteredSequence = new BluetoothLengthDeviceNameFilter().filter(deviceName, 0,
            deviceName.length(),
            new SpannedString(""),
            0, 0);
    // null -> use the original
    if (filteredSequence == null) {
        return deviceName;
    }
    return filteredSequence.toString();
}

private void setTetherSsidName(String deviceName) {
    final SoftApConfiguration config = mWifiManager.getSoftApConfiguration();
    // TODO: If tether is running, turn off the AP and restart it after setting config.
    mWifiManager.setSoftApConfiguration(
            new SoftApConfiguration.Builder(config).setSsid(deviceName).build());
}