使用 BLE Android 4.3 如何编写特性？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/20043388/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Working with BLE Android 4.3 how to write characteristics?
提问by Nomiluks
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.
我正在使用 Android 4.3 API 开发 BLE 项目（Android 应用程序），我使用了示例 BLE 应用程序，它仅读取 DeviceControlActivity.activity 中的特性，但我想写入特性并在单击按钮时将其发送到 BLE 芯片。我如何在芯片cc2540上写数据..基本上我不知道写特性的分步程序。
write i can only see the name and id of device with following piece of code in DeviceControlActivity
写我只能在 DeviceControlActivity 中看到带有以下代码的设备的名称和 ID
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;
}
};
回答by Nam Pham
The following code is write characteristic using byte[]data:
以下代码是使用byte[]数据写入特性：
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;
}
回答by Miguel
Please note that the logic OR in:
if ((charaProp | BluetoothGattCharacteristic.PROPERTY_READ) > 0)" in the original post should be a logic AND for the permission check to work. Same for the second charaProp comparison. Otherwise bot statements are true regardless of the actual permission flag.
请注意，if ((charaProp | BluetoothGattCharacteristic.PROPERTY_READ) > 0)原始帖子中的逻辑 OR in:
" 应该是一个逻辑 AND 才能使权限检查工作。第二个 charaProp 比较也是如此。否则无论实际权限标志如何，bot 语句都是正确的。
回答by Huy Tower
The following code is write characteristic using stringdata in utf-8format:
以下代码是使用格式中的string数据写入特性utf-8：
public void writeCharacteristic(BluetoothGattCharacteristic characteristic,
String data) {
if (mBluetoothAdapter == null || mBluetoothGatt == null) {
Log.w(TAG, "BluetoothAdapter not initialized");
return;
}
Log.i(TAG, "characteristic " + characteristic.toString());
try {
Log.i(TAG, "data " + URLEncoder.encode(data, "utf-8"));
characteristic.setValue(URLEncoder.encode(data, "utf-8"));
// TODO
mBluetoothGatt.writeCharacteristic(characteristic);
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
}
Hope it helps!
希望能帮助到你！
回答by image
public boolean writeCharacteristic(byte value[],int type){
//check mBluetoothGatt is available
if (mBluetoothGatt == null) {
Log.e(TAG, "lost connection");
return false;
}
BluetoothGattService Service = mBluetoothGatt.getService(UUID_SIMPLESERVICE);
if (Service == null) {
Log.e(TAG, "service not found!");
//////////NO service found...........
return false;
}
BluetoothGattCharacteristic charac1 = null;
boolean status1 = false;
if(type==1) {
charac1 = Service.getCharacteristic(UUID_PORT1);
charac1.setValue(value);
status1 = mBluetoothGatt.writeCharacteristic(charac1);
Log.v("________BLESERVICE____", "___WRITE CHARATERISTICS STATUS:_________"+status1);
onReliableWriteCompleted(status1);
}
if (charac1 == null) {
Log.e(TAG, "char not found!");
return false;
}
Log.v("___TYPE___","______________________"+type);
return status1;
}
