我有一个基本的Android应用程序。这几乎与我已编写和测试的内容重复。
servicesDiscovered未触发，并且在我手动搜索时找不到任何服务。
我无法弄清楚出了什么问题，请注意它不是BLE设备本身，因为使用预制的BLE应用程序（用于调试它显示所有特征，服务等）
有人可以帮忙吗？我认为这很简单，但我似乎无法找到它！
package airconditioner.com.airconditioncontrol;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothGatt;
import android.bluetooth.BluetoothGattCallback;
import android.bluetooth.BluetoothGattCharacteristic;
import android.bluetooth.BluetoothGattService;
import android.bluetooth.BluetoothManager;
import android.bluetooth.BluetoothProfile;
import android.bluetooth.le.BluetoothLeScanner;
import android.bluetooth.le.ScanCallback;
import android.bluetooth.le.ScanResult;
import android.content.Context;
import android.content.Intent;
import android.graphics.Color;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.List;
import java.util.UUID;
public class MainActivity extends Activity {
/**************CUSTOM CLASS TO HANDLE DEVICE LIST*******************/
private class LeDeviceListAdapter{
private ArrayList<BluetoothDevice> mLeDevices;
private ArrayList<String> adapter;
private Context context;
public LeDeviceListAdapter(){
mLeDevices = new ArrayList<BluetoothDevice>();
adapter = new ArrayList<String>();
}
public void addDevice(BluetoothDevice device){ //add device name and address
if(!mLeDevices.contains(device)){
mLeDevices.add(device);
String name;
if(device.getName() != null)
name = device.getName();
else
name = "unknown - null";
String address;
if(device.getAddress() != null)
address = device.getAddress();
else
address = "unknown - null";
adapter.add(name + "\n" + address); //push BLE info to list of strings
}
}
public void clear(){mLeDevices.clear();}
public BluetoothDevice getDevice(int i){return mLeDevices.get(i);}
public void update(){
handle.post(new Runnable() {
@Override
public void run() {
ListView list = (ListView)findViewById(R.id.ble_list);
list.setAdapter(new ArrayAdapter<String>(getApplicationContext(), R.layout.textlayout, adapter));
}
});
}
}
/*************DECLARE GLOBAL VARIABLES FOR BLE****************/
private BluetoothAdapter mBluetoothAdapter;
private BluetoothLeScanner mBluetoothScan;
private BluetoothGatt gatt;
private LeDeviceListAdapter mLeDeviceListAdapter; //implemented in code - custom
private boolean mScanning;
private UUID AIR_SETTING_SERVICE = UUID.fromString("762fd44e-1610-4730-a364-c9af0c07628c");
private UUID AIR_SETTING_ATTRIBUTE = UUID.fromString("e5eb1257-1892-4353-89d6-eba2f89562bd");
private final Handler handle = new Handler(Looper.getMainLooper());
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//Get List View and create method for OnClick
ListView ble_list = (ListView)findViewById(R.id.ble_list);
ble_list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
BluetoothDevice device = mLeDeviceListAdapter.getDevice(position);
if (device != null){
if(mScanning){
scanForDevice(false);
connectTo(device);
}else{
Toast toast = Toast.makeText(getApplicationContext(), "Error: onItemClick()", Toast.LENGTH_LONG);
toast.show();
}
}
}
});
//START BLUETOOTH
final BluetoothManager bluetoothManager = (BluetoothManager)getSystemService(Context.BLUETOOTH_SERVICE);
mBluetoothAdapter = bluetoothManager.getAdapter();
mBluetoothScan = mBluetoothAdapter.getBluetoothLeScanner();
if(mBluetoothAdapter == null || !mBluetoothAdapter.isEnabled()){
Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent, 1); //Usually 1 is a global variable
}
//Initialize list view adapter
mLeDeviceListAdapter = new LeDeviceListAdapter();
//start scan
scanForDevice(true);
}
@Override
protected void onDestroy(){
if(gatt != null)
gatt.close();
gatt = null; //FIX THIS IMPLEMENTATION
super.onDestroy();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/*************HANDLE START OF SCANNING FOR DEVICES**************/
private void scanForDevice(final boolean enable){
if(enable){
ListView list = (ListView)findViewById(R.id.ble_list);
list.setAdapter(null);
mScanning = true;
mBluetoothScan.startScan(mLeScanCallback);
Log.d("SCAN", "SCAN START");
}else{
mScanning = false;
mBluetoothScan.stopScan(mLeScanCallback);
Log.d("SCAN", "SCAN STOP");
}
}
//Callback for received BLE Devices
private ScanCallback mLeScanCallback =
new ScanCallback(){
@Override
public void onScanResult(int CallBackType, final ScanResult result){
runOnUiThread(new Runnable(){
@Override
public void run(){
Log.d("BLE DEVICE:", result.getDevice().getAddress().toString()); //Log Address
mLeDeviceListAdapter.addDevice(result.getDevice()); //Add info to custom class
mLeDeviceListAdapter.update(); //Update UI
}
});
}
};
//Connect to a passed device
private void connectTo(BluetoothDevice device){
if(gatt == null){
gatt = device.connectGatt(getApplicationContext(), false, gattCallBack);
}else{
Log.d("ERROR", "gatt != null");
Toast t = Toast.makeText(getApplicationContext(), "ERROR: gatt != null", Toast.LENGTH_LONG);
}
}
//Gatt callback for connection changes
private final BluetoothGattCallback gattCallBack = new BluetoothGattCallback() {
@Override
public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) { //handle connecting BLE
Log.d("CONNECTION STATUS", "Status: " + status + " newState: " + newState);
switch(newState){
case BluetoothProfile.STATE_CONNECTED:
Log.d("STATE", "CONNECTED");
handle.post(new Runnable(){
@Override
public void run(){
TextView text = (TextView)findViewById(R.id.connection_status);
text.setText("Status: Connected");
text.setTextColor(Color.BLUE);
}
});
break;
case BluetoothProfile.STATE_DISCONNECTED:
Log.d("STATE", "CONNECTED");
handle.post(new Runnable(){
@Override
public void run(){
TextView text = (TextView)findViewById(R.id.connection_status);
text.setText("Status: Disconnected");
text.setTextColor(Color.BLACK);
}
});
break;
}
}
@Override
public void onServicesDiscovered(BluetoothGatt gatt, int status){
//Log services
List<BluetoothGattService> services = gatt.getServices();
for(BluetoothGattService a : services)
Log.d("SERVICES", a.getUuid().toString());
//get service
BluetoothGattService service = gatt.getService(AIR_SETTING_SERVICE);
if(service != null){
BluetoothGattCharacteristic characteristic = service.getCharacteristic(AIR_SETTING_ATTRIBUTE);
//Log characteristics in service
List<BluetoothGattCharacteristic> charac = service.getCharacteristics();
for(BluetoothGattCharacteristic c : charac)
Log.d("CHARACTERISTIC", c.getUuid().toString());
if(characteristic !=null){
gatt.readCharacteristic(characteristic); //go to callback for reading
Log.d("CHARACTERISTIC", "WORKING");
}else{
Log.d("ERROR", "CHARACTERISTIC NULL");
}
}else{
Log.d("ERROR", "SERVICE NULL");
}
}
@Override
public void onCharacteristicWrite(BluetoothGatt g, BluetoothGattCharacteristic c, int status){ //handle characteristic write
if(status != 0){
Log.d("ERROR", "WRITE FAILED: " + status);
}else{
Log.d("GATT", "WRITTEN"); //Check status codes
}
}
@Override
public void onCharacteristicRead(BluetoothGatt g, BluetoothGattCharacteristic c, int status){
if(status != 0){
Log.d("ERROR", "READ FAIL: " + status);
}else{
//Handle getting storing current value read
Log.d("GATT", "READ");
//Don't need to store value locally - c.getIntValue(BluetoothGattCharacteristic.FORMAT_UINT8,0);
}
}
};
/***********HANDLE BUTTON PRESSES******************/
public void sendStatus(View view){
EditText textBox = (EditText)findViewById(R.id.edit_message);
int status = -1;
try{
status = Integer.parseInt(textBox.getText().toString());
}catch(Exception e){
Log.d("EXCEPTION", "Parsing String -> Int");
Toast.makeText(getApplicationContext(), "Please enter a valid number", Toast.LENGTH_LONG).show();
return;
}
if(gatt != null){
List<BluetoothGattService> services = gatt.getServices();
for(BluetoothGattService a : services)
Log.d("SERVICES", a.getUuid().toString());
BluetoothGattService service = gatt.getService(AIR_SETTING_SERVICE);
BluetoothGattCharacteristic characteristic;
if(service != null)
characteristic = service.getCharacteristic(AIR_SETTING_ATTRIBUTE);
else
Log.d("ERROR", "SERVICE NULL");
/*
if(service == null || characteristic == null){ //catch errors
Log.d("ERROR", "SERVICE OR CHARACTERISTIC NULL");
Toast.makeText(getApplicationContext(), "Service or characteristic is null!", Toast.LENGTH_LONG).show();
}else{
characteristic.setValue(status, BluetoothGattCharacteristic.FORMAT_UINT8, 0); //change local characteristic
gatt.writeCharacteristic(characteristic); //write characteristic
//Update UI
TextView text = (TextView)findViewById(R.id.fan_status);
switch(status){
case 0:
text.setText("Status: OFF");
break;
case 1:
text.setText("Status: LOW");
break;
case 2:
text.setText("Status: MED");
break;
case 3:
text.setText("Status: HIGH");
break;
default:
Log.d("ERROR", "Status: " + status);
}
}
}else{
Toast.makeText(getApplicationContext(), "You need to connect to a device first", Toast.LENGTH_SHORT).show();*/
}
}
public void disconnectBLE(View view){
Toast.makeText(getApplicationContext(), "Disconnecting Bluetooth...", Toast.LENGTH_SHORT).show();
//close BLE
if(gatt != null)
gatt.close();
gatt = null;
//reset and restart scan
scanForDevice(true);
}
}
答案 0 :(得分：0)
注意：
如果您忘记了discoverService（），它就不会发现，发现服务！