Android 6(棉花糖)中不稳定的BLE连接
我正在开发一款android应用程序,可以使用蓝牙技术。它在安卓4.3或5.0.1以及各种设备上运行良好,但在安卓M(6.0.1)中并不稳定。我编写了一个lite示例项目,该项目具有相同的行为和问题,下面是我的全部代码Android 6(棉花糖)中不稳定的BLE连接,android,bluetooth,bluetooth-lowenergy,rssi,Android,Bluetooth,Bluetooth Lowenergy,Rssi,我正在开发一款android应用程序,可以使用蓝牙技术。它在安卓4.3或5.0.1以及各种设备上运行良好,但在安卓M(6.0.1)中并不稳定。我编写了一个lite示例项目,该项目具有相同的行为和问题,下面是我的全部代码 @TargetApi(Build.VERSION_CODES.LOLLIPOP) public class MainActivity extends ActionBarActivity { private BluetoothAdapter mBluetoothAdapte
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
public class MainActivity extends ActionBarActivity {
private BluetoothAdapter mBluetoothAdapter;
private int REQUEST_ENABLE_BT = 1;
private Handler mHandler;
private static final long SCAN_PERIOD = 2000;
private BluetoothLeScanner mLEScanner;
private ScanSettings settings;
private List<ScanFilter> filters;
private BluetoothGatt mGatt;
private boolean connectionState = false, isScanning = false;
private TextView rssiTxt;
private RSSITimer rssiTimer;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mHandler = new Handler();
if (!getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH_LE)) {
Toast.makeText(this, "BLE Not Supported",
Toast.LENGTH_SHORT).show();
finish();
}
final BluetoothManager bluetoothManager =
(BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);
mBluetoothAdapter = bluetoothManager.getAdapter();
// VIEW
rssiTxt = (TextView) findViewById(R.id.rssiTxt);
(rssiTimer = new RSSITimer()).startTimer();
}
@Override
protected void onResume() {
super.onResume();
if (mBluetoothAdapter == null || !mBluetoothAdapter.isEnabled()) {
Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
} else {
if (Build.VERSION.SDK_INT >= 21) {
mLEScanner = mBluetoothAdapter.getBluetoothLeScanner();
settings = new ScanSettings.Builder()
.setScanMode(ScanSettings.SCAN_MODE_LOW_LATENCY)
.build();
filters = new ArrayList<ScanFilter>();
}
scanLeDevice(true);
}
}
@Override
protected void onPause() {
super.onPause();
if (mBluetoothAdapter != null && mBluetoothAdapter.isEnabled()) {
//scanLeDevice(false);
}
}
@Override
protected void onDestroy() {
rssiTimer.stopTimerTask();
if (mGatt == null) {
return;
}
mGatt.close();
mGatt = null;
super.onDestroy();
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == REQUEST_ENABLE_BT) {
if (resultCode == Activity.RESULT_CANCELED) {
//Bluetooth not enabled.
finish();
return;
}
}
super.onActivityResult(requestCode, resultCode, data);
}
private void scanLeDevice(final boolean enable) {
if(isScanning) {
return;
} else {
isScanning = true;
}
if (enable) {
mHandler.postDelayed(new Runnable() {
@Override
public void run() {
if (Build.VERSION.SDK_INT < 21) {
mBluetoothAdapter.stopLeScan(mLeScanCallback);
isScanning = false;
} else {
mLEScanner.stopScan(mScanCallback);
isScanning = false;
}
}
}, SCAN_PERIOD);
if (Build.VERSION.SDK_INT < 21) {
mBluetoothAdapter.startLeScan(mLeScanCallback);
} else {
mLEScanner.startScan(filters, settings, mScanCallback);
}
} else {
if (Build.VERSION.SDK_INT < 21) {
mBluetoothAdapter.stopLeScan(mLeScanCallback);
} else {
mLEScanner.stopScan(mScanCallback);
}
}
}
private ScanCallback mScanCallback = new ScanCallback() {
@Override
public void onScanResult(int callbackType, ScanResult result) {
Log.i("callbackType", String.valueOf(callbackType));
Log.i("result", result.toString());
BluetoothDevice btDevice = result.getDevice();
if ("PRODi".equals(device.getName()) || "PRODi(TEST)".equals(device.getName())) {
connectToDevice(btDevice);
}
}
@Override
public void onBatchScanResults(List<ScanResult> results) {
for (ScanResult sr : results) {
Log.i("ScanResult - Results", sr.toString());
}
}
@Override
public void onScanFailed(int errorCode) {
Log.e("Scan Failed", "Error Code: " + errorCode);
}
};
private BluetoothAdapter.LeScanCallback mLeScanCallback =
new BluetoothAdapter.LeScanCallback() {
@Override
public void onLeScan(final BluetoothDevice device, int rssi,
byte[] scanRecord) {
runOnUiThread(new Runnable() {
@Override
public void run() {
Log.i("onLeScan", device.toString());
if ("PRODi".equals(device.getName()) || "PRODi(TEST)".equals(device.getName())) {
connectToDevice(device);
}
}
});
}
};
public void connectToDevice(BluetoothDevice device) {
if (mGatt == null) {
mGatt = device.connectGatt(getApplicationContext(), false, gattCallback);
scanLeDevice(false);// will stop after first device detection
return;
} else {
mGatt.connect();
scanLeDevice(false);// will stop after first device detection
}
}
private final BluetoothGattCallback gattCallback = new BluetoothGattCallback() {
@Override
public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
switch (newState) {
case BluetoothProfile.STATE_CONNECTED:
Log.i("gattCallback", "STATE_CONNECTED");
gatt.discoverServices();
connectionState = true;
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(MainActivity.this, "STATE_CONNECTED", Toast.LENGTH_SHORT).show();
}
});
break;
case BluetoothProfile.STATE_DISCONNECTED:
Log.e("gattCallback", "STATE_DISCONNECTED");
connectionState = false;
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(MainActivity.this, "STATE_DISCONNECTED", Toast.LENGTH_SHORT).show();
}
});
break;
default:
Log.e("gattCallback", "STATE_OTHER");
}
}
@Override
public void onServicesDiscovered(BluetoothGatt gatt, int status) {
List<BluetoothGattService> services = gatt.getServices();
Log.i("onServicesDiscovered", services.toString());
gatt.readCharacteristic(services.get(1).getCharacteristics().get(0));
}
@Override
public void onCharacteristicRead(BluetoothGatt gatt,
BluetoothGattCharacteristic
characteristic, int status) {
Log.i("onCharacteristicRead", characteristic.toString());
gatt.disconnect();
}
@Override
public void onReadRemoteRssi(BluetoothGatt gatt, int rssi, int status) {
super.onReadRemoteRssi(gatt, rssi, status);
final int rssi2 = rssi;
runOnUiThread(new Runnable() {
@Override
public void run() {
rssiTxt.setText("RSSI: " + rssi2);
}
});
}
};
/*TIMER for Read RSSI*/////////////////////////////////////////////////////////////////////////////////////////
class RSSITimer {
//we are going to use a handler to be able to run in our TimerTask
final Handler handler = new Handler();
private Timer timer;
private TimerTask timerTask;
private int interval = 1000;
public void startTimer() {
//set a new Timer
timer = new Timer();
//initialize the TimerTask's job
initializeTimerTask();
//schedule the timer, after the first 1000ms the TimerTask will run every [INTERVAL]ms
timer.schedule(timerTask, 1000, interval); //
}
public void stopTimerTask() {
//stop the timer, if it's not already null
if (timer != null)
{
timer.cancel();
timer = null;
}
}
public void initializeTimerTask() {
timerTask = new TimerTask() {
public void run() {
handler.post(new Runnable() {
public void run() {
if (mBluetoothAdapter.isEnabled()) {
if (connectionState == false) {
scanLeDevice(true);
} else {
mGatt.readRemoteRssi();
}
}
}
});
}
};
}
}
}
@TargetApi(Build.VERSION\u CODES.LOLLIPOP)
公共类MainActivity扩展了ActionBarActivity{
私人蓝牙适配器mBluetoothAdapter;
私有整数请求\启用\ BT=1;
私人经理人;
专用静态最终长扫描周期=2000;
私人蓝牙扫描仪;
私人扫描设置;
私有列表过滤器;
私人蓝牙GATT mGatt;
私有布尔连接状态=false,isScanning=false;
私有文本视图rssiTxt;
私人RSSITimer RSSITimer;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mHandler=新处理程序();
如果(!getPackageManager().hasSystemFeature(PackageManager.FEATURE\u BLUETOOTH\u LE)){
Toast.makeText(不支持此选项),
吐司。长度(短)。show();
完成();
}
最终BluetoothManager BluetoothManager=
(BluetoothManager)getSystemService(Context.BLUETOOTH\u服务);
mBluetoothAdapter=bluetoothManager.getAdapter();
//看法
rssiTxt=(TextView)findViewById(R.id.rssiTxt);
(rssiTimer=new rssiTimer()).startTimer();
}
@凌驾
受保护的void onResume(){
super.onResume();
if(mBluetoothAdapter==null | |!mBluetoothAdapter.isEnabled()){
Intent enablebintent=新意图(BluetoothAdapter.ACTION\u REQUEST\u ENABLE);
startActivityForResult(启用BTIntent、请求\启用\ BT);
}否则{
如果(Build.VERSION.SDK_INT>=21){
mLEScanner=mBluetoothAdapter.getBluetoothLeScanner();
设置=新的ScanSettings.Builder()
.setScanMode(扫描设置.SCAN\u模式\u低延迟)
.build();
过滤器=新的ArrayList();
}
扫描设备(真实);
}
}
@凌驾
受保护的void onPause(){
super.onPause();
if(mBluetoothAdapter!=null&&mBluetoothAdapter.isEnabled()){
//扫描设备(假);
}
}
@凌驾
受保护的空onDestroy(){
rssiTimer.stopTimerTask();
如果(mGatt==null){
返回;
}
mGatt.close();
mGatt=null;
super.ondestory();
}
@凌驾
受保护的void onActivityResult(int请求代码、int结果代码、意图数据){
if(requestCode==请求启用){
if(resultCode==Activity.RESULT\u已取消){
//蓝牙未启用。
完成();
返回;
}
}
super.onActivityResult(请求代码、结果代码、数据);
}
专用void扫描设备(最终布尔启用){
如果(正在扫描){
返回;
}否则{
IsScaning=真;
}
如果(启用){
mHandler.postDelayed(新的Runnable(){
@凌驾
公开募捐{
if(Build.VERSION.SDK_INT<21){
mBluetoothAdapter.stopLeScan(mLeScanCallback);
isScanning=false;
}否则{
mLEScanner.stopScan(mScanCallback);
isScanning=false;
}
}
},扫描周期);
if(Build.VERSION.SDK_INT<21){
mBluetoothAdapter.startedscan(mLeScanCallback);
}否则{
mLEScanner.startScan(过滤器、设置、mScanCallback);
}
}否则{
if(Build.VERSION.SDK_INT<21){
mBluetoothAdapter.stopLeScan(mLeScanCallback);
}否则{
mLEScanner.stopScan(mScanCallback);
}
}
}
private ScanCallback mScanCallback=新建ScanCallback(){
@凌驾
公共void onScanResult(int callbackType、ScanResult){
Log.i(“callbackType”,String.valueOf(callbackType));
Log.i(“result”,result.toString());
BluetoothDevice btDevice=result.getDevice();
如果(“PRODi”.equals(device.getName())| |“PRODi(TEST)”.equals(device.getName())){
连接到设备(BTD设备);
}
}
@凌驾
public void onBatchScanResults(列出结果){
用于(扫描结果sr:结果){
Log.i(“ScanResult-Results”,sr.toString());
}
}
@凌驾
公共无效OnScan失败(内部错误代码){
Log.e(“扫描失败”,“错误代码:”+错误代码);
}
};
私有BluetoothAdapter.LeScanCallback mLeScanCallback=
新的BluetoothAdapter.LeScanCallback(){
@凌驾
public void onLeScan(最终蓝牙设备,int rssi,
字节[]扫描记录){
runOnUiThread(新的Runnable(){
@凌驾
公开募捐{
Log.i(“onLeScan”,device.toString());
如果(“PRODi”.equals(device.getName())| |“PRODi(TEST)”.equals(device.getName())){
连接到设备(设备);
}
}
});
}
};
public void connectToDevice(蓝牙设备){
如果(mGatt==null){
mGatt=device.connectGatt(getApplicationContext(),false,gattCallback);
扫描设备(错误);//wi