Android BLE-读取特征数据-如何为按钮添加特征

我有一个班级活动。类的内部是UUID服务和特性的列表。单击UUID特性时，将读取有关特性的数据并显示

但我想用按钮替换列表。当我点击按钮时，它应该读取特征并显示出来。我的代码有问题：请帮助我

这是关于UUID列表的代码：

private final ExpandableListView.OnChildClickListener servicesListClickListner = new  ExpandableListView.OnChildClickListener() {       
   @Override
    public boolean onChildClick(ExpandableListView parent, View v,
            int groupPosition, int childPosition, long id) {
        if (mGattCharacteristics != null) {
            final BluetoothGattCharacteristic characteristic = mGattCharacteristics
                    .get(groupPosition).get(childPosition);
            final int charaProp = characteristic.getProperties();
            if ((charaProp | BluetoothGattCharacteristic.PROPERTY_READ) > 0) {
                // If there is an active notification on a characteristic,
                // clear
                // it first so it doesn't update the data field on the user
                // interface.
                if (mNotifyCharacteristic != null) {
                    mBluetoothLeService.setCharacteristicNotification(
                            mNotifyCharacteristic, false);
                    mNotifyCharacteristic = null;
                }
                mBluetoothLeService.readCharacteristic(characteristic);
            }
            if ((charaProp | BluetoothGattCharacteristic.PROPERTY_NOTIFY) > 0) {
                mNotifyCharacteristic = characteristic;
                mBluetoothLeService.setCharacteristicNotification(
                        characteristic, true);
            }
            return true;
        }
        return false;
    }
};

这是按钮的代码：

mBattery.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            final BluetoothGattCharacteristic characteristic = mGattCharacteristics
                    .get(4).get(1);
            displayData(characteristic.getService().toString());
            mBluetoothLeService.readCharacteristic(characteristic);
        }
    });

问题是当我单击按钮时：BLE已停止。

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多谢各位

您应该检查logcat，以便可以从获得的异常中查看stacktrace。在不知道代码的其他部分是否有检查的情况下，很容易得到NullPointerException或ArrayIndexOutOfBoundsException，特别是因为您在mBattery.setOnClickListener中硬编码数组索引，即4和1

一般来说，您注册通知的方式不起作用，可能会导致问题。下面是一个如何操作的示例：

if( mBluetoothLeService.setCharacteristicNotification(mNotifyCharacteristic, true) )
{
    final UUID CLIENT_CHARACTERISTIC_CONFIGURATION_DESCRIPTOR_UUID = UUID.fromString("00002902-0000-1000-8000-00805f9b34fb");

    BluetoothGattDescriptor descriptor = mNotifyCharacteristic.getDescriptor(CLIENT_CHARACTERISTIC_CONFIGURATION_DESCRIPTOR_UUID);

    if( descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE) )
    {
        if( mBluetoothLeService.writeDescriptor(descriptor) )
        {
            // Now wait for callback to BluetoothGattCallback#onDescriptorWrite().
        }
    }
}