我正在使用的是Android 4.3的API一个BLE项目（Android应用程序），我用的样品BLE的应用程序是只读特性DeviceControlActivity.activity，但我想写的特点，并将其发送到BLE芯片上单击按钮。我怎么能写在芯片CC2540数据..基本上我不知道一步程序步骤写特性。

写，我只能看到设备的名称和id与下面这段code在DeviceControlActivity

 私人最终ExpandableListView.OnChildClickListener servicesListClickListner =
        新ExpandableListView.OnChildClickListener（）{
            @覆盖
            公共布尔onChildClick（ExpandableListView父，视图V，INT groupPosition，
                                        INT childPosition，长ID）{
                如果（mGattCharacteristics！= NULL）{
                    最后BluetoothGattCharacteristic特征=
                            mGattCharacteristics.get（groupPosition）获得（childPosition）;
                    最终诠释charaProp = characteristic.getProperties（）;
                    如果（（charaProp | BluetoothGattCharacteristic.PROPERTY_READ）大于0）{
                        //如果有一个活动的通知上的特性，明确
                        //它首先因此它不更新用户接口上的数据字段。
                        如果（mNotifyCharacteristic！= NULL）{
                            mBluetoothLeService.setCharacteristicNotification（
                                    mNotifyCharacteristic，假）;
                            mNotifyCharacteristic = NULL;
                        }
                        mBluetoothLeService.readCharacteristic（特性）;
                        的ShowDialog（读书）;
                    }

                    如果（（charaProp | BluetoothGattCharacteristic.PROPERTY_WRITE）大于0）{
                        //如果有一个活动的通知上的特性，明确
                        //它首先因此它不更新用户接口上的数据字段。
                        如果（mNotifyCharacteristic！= NULL）{
                            mBluetoothLeService.setCharacteristicNotification（
                                    mNotifyCharacteristic，假）;
                            mNotifyCharacteristic = NULL;
                        }
                        mBluetoothLeService.writeCharacteristic（特性）;
                        的ShowDialog（写）;
                        //characteristic.setValue(bytes）;
                        //characteristic.setValue("testing）;
                        //characteristic.setWriteType(BluetoothGattCharacteristic.PERMISSION_WRITE）;
                    }
                    如果（（charaProp | BluetoothGattCharacteristic.PROPERTY_NOTIFY）大于0）{
                        mNotifyCharacteristic =特性;
                        mBluetoothLeService.setCharacteristicNotification（
                                特性，真）;
                    }

                    byte []的值= {0×00，（字节）（0xB9）值，0X0D，（字节）（0×90），值为0x2F};
                    如果（！characteristic.setValue（值））
                    {
                        Log.w（TAG，无法设置特色的本地值）;
                        //返回;
                    }

                    characteristic.setWriteType（BluetoothGattCharacteristic.WRITE_TYPE_NO_RESPONSE）;
                    /*if(!writeCharacteristic.writeCharacteristic(characteristic））
                    {
                        Log.w（TAG，无法写入特性）;
                    } * /

                    返回true;
                }
                返回false;
            }
};
 

解决方案

以下code是写特性使用字节[] 数据：

 公共布尔writeCharacteristic（）{

    //检查mBluetoothGatt可用
    如果（mBluetoothGatt == NULL）{
        Log.e（TAG，失去联系）;
        返回false;
    }
    BluetoothGattService服务= mBluetoothGatt.getService（您服务）;
    如果（服务== NULL）{
        Log.e（TAG的服务没有找到！）;
        返回false;
    }
    BluetoothGattCharacteristic charac =服务
            .getCharacteristic（你的特性）;
    如果（charac == NULL）{
        Log.e（TAG，CHAR没有找到！）;
        返回false;
    }

    byte []的值=新的字节[1];
    值[0] =（字节）（21安培;为0xFF）;
    charac.setValue（值）;
    布尔值状态= mBluetoothGatt.writeCharacteristic（charac）;
    返回状态;
}
 

I am working on a BLE project (Android application) using Android 4.3 API, i have used sample BLE app it is only reading characteristics in DeviceControlActivity.activity, but i want to write characteristics and send it to BLE chip on clicking a button. How can I write data on chip cc2540 .. Basically i don't know the step by step procedure to write characteristics.

write i can only see the name and id of device with following piece of code in DeviceControlActivity

 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);
                        showDialog("reading");
                    }

                    if ((charaProp | BluetoothGattCharacteristic.PROPERTY_WRITE) > 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.writeCharacteristic(characteristic);
                        showDialog("writing");
                        //characteristic.setValue(bytes);
                        //characteristic.setValue("testing");
                        //characteristic.setWriteType(BluetoothGattCharacteristic.PERMISSION_WRITE);
                    }
                    if ((charaProp | BluetoothGattCharacteristic.PROPERTY_NOTIFY) > 0) {
                        mNotifyCharacteristic = characteristic;
                        mBluetoothLeService.setCharacteristicNotification(
                                characteristic, true);
                    }

                    byte[] value = {0x00, (byte) (0xB9) , 0x0D, (byte) (0x90), 0x2F};
                    if(!characteristic.setValue(value)) 
                    {
                        Log.w(TAG, "Couldn't set characteristic's local value"); 
                        //return;
                    }

                    characteristic.setWriteType(BluetoothGattCharacteristic.WRITE_TYPE_NO_RESPONSE);
                    /*if(!writeCharacteristic.writeCharacteristic(characteristic))
                    { 
                        Log.w(TAG, "Couldn't write characteristic");
                    }*/

                    return true;
                }
                return false;
            }
};

The following code is write characteristic using byte[] data:

    public boolean writeCharacteristic(){

    //check mBluetoothGatt is available
    if (mBluetoothGatt == null) {
        Log.e(TAG, "lost connection");
        return false;
    }
    BluetoothGattService Service = mBluetoothGatt.getService(your Services);
    if (Service == null) {
        Log.e(TAG, "service not found!");
        return false;
    }
    BluetoothGattCharacteristic charac = Service
            .getCharacteristic(your characteristic);
    if (charac == null) {
        Log.e(TAG, "char not found!");
        return false;
    }

    byte[] value = new byte[1];
    value[0] = (byte) (21 & 0xFF);
    charac.setValue(value);
    boolean status = mBluetoothGatt.writeCharacteristic(charac);
    return status;
}