当我从主屏幕切换到另一个活动时，我的BLE设备断开连接。这是我的主要活动：
public class MainActivity extends FragmentActivity implements OnDataReceivedListener, OnStateChangedListener, PopupMenu.OnMenuItemClickListener, WorkoutTimerInterface, WorkOutOverDialogInterface {
FlipApi flipApi;
CalcData calcData;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
new WorkInBack().execute();
}
@Override
public void onHeartRateReceived(int hr) {
}
@Override
public void onStepsReceived(int steps) {
}
@Override
public void onBatteryReceived(int bae) {
}
@Override
public void onStateChanged(int state) {
}
@Override
public boolean onMenuItemClick(MenuItem item) {
switch (item.getItemId()) {
case R.id.item_workout:
Intent intent1 = new Intent(MainActivity.this, WorkOutList.class);
MainActivity.this.startActivity(intent1);
return true;
default:
return false;
}
}
@Override
protected void onDestroy() {
super.onDestroy();
flipApi.disconnect();
Log.d("On destroy","");
}
class WorkInBack extends AsyncTask<Context, Void, Void> {
@Override
protected Void doInBackground(Context... params) {
database_steps = new DatabaseHandler(MainActivity.this, "steps_table");
database_workout = new DatabaseHandler(MainActivity.this, "flip_table");
flipApi = new FlipApi(MainActivity.this);
return null;
}
@Override
protected void onPostExecute(Void aVoid) {
super.onPostExecute(aVoid);
flipApi.initApi();
flipApi.setOnDataReceivedListener(MainActivity.this);
flipApi.setOnStateChangeListener(MainActivity.this);
logo.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
flipApi.startScan();
}
});
}
}
@Override
protected void onStop() {
super.onStop();
SharedPreferences.Editor editor = workout_session.edit();
editor.putInt("last_steps", steps_total);
editor.putFloat("distance", distance);
editor.apply();
database_workout.close();
}
@Override
public void onBackPressed() {
if (exit == 1) {
exit = 0;
finish();
} else {
Snackbar.make(x, "Press Back Again to Exit", Snackbar.LENGTH_SHORT).show();
exit = 1;
}
}
所以，我有一个弹出菜单，可以将我重定向到另一个活动。当我点击这个时，我从Bluetooth Gatt那里得到一个日志，说它关闭了。我也查看了我的API，发现没有问题。这是我的API，以防它有用：
public class FlipApi {
Intent iBluetoothLeService;
static BluetoothDevice mBluetoothDevice;
BluetoothAdapter mBluetoothAdapter;
private ProgressDialog mProgressDialog;
float x_p=0,x_e=60,P_p=1,P_e=1,Q=0.01f,RM=0.5f,K=0;
Context activitycontext ;
private OnDataReceivedListener onDataReceivedListener;
private OnStateChangedListener onStateChangedListener;
public static final int STATE_CONNECTED = 0x45;
public static final int STATE_DISCONNECTED = 0x46;
boolean isBond = false;
public FlipApi(Context context)
{
this.activitycontext = context;
}
ScanCallback mLeScanCallback;
public void initApi()
{
mProgressDialog = new ProgressDialog(activitycontext);
mProgressDialog.setCanceledOnTouchOutside(false);
mProgressDialog.setMessage("finding device");
IntentFilter intentFilter= new IntentFilter();
intentFilter.addAction("com.flip.data");
activitycontext.registerReceiver(bluetoothDataReceiver,intentFilter);
final BluetoothManager bluetoothManager =
(BluetoothManager) activitycontext.getSystemService(Context.BLUETOOTH_SERVICE);
mBluetoothAdapter = bluetoothManager.getAdapter();
if(mBluetoothAdapter==null) {
Toast.makeText(activitycontext, "Bluetooth not found", Toast.LENGTH_LONG).show();
}
else if(!mBluetoothAdapter.isEnabled()){
Intent enableBluetooth= new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
activitycontext.startActivity(enableBluetooth);
}
if(Build.VERSION.SDK_INT >=21) {
mLeScanCallback =
new ScanCallback() {
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
@Override
public void onScanResult(int callbackType, ScanResult result) {
super.onScanResult(callbackType, result);
try {
if (result.getDevice().getName().contains("FLIP9") || result.getDevice().getName().contains("FLIP8")) {
mProgressDialog.dismiss();
mBluetoothDevice = result.getDevice();
iBluetoothLeService = new Intent(activitycontext, BluetoothLeService.class);
isBond = activitycontext.bindService(iBluetoothLeService, mServiceConnection, Context.BIND_AUTO_CREATE);
Log.d("flip", "device found");
Toast.makeText(activitycontext, result.getDevice().getName() + " found", Toast.LENGTH_SHORT).show();
mBluetoothAdapter.getBluetoothLeScanner().stopScan(mLeScanCallback);
}
} catch (Exception ex) {
ex.printStackTrace();
}
}
@Override
public void onScanFailed(int errorCode) {
super.onScanFailed(errorCode);
}
};
}
}
public void startScan()
{
if(mBluetoothAdapter.isEnabled()) {
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
if(mLeScanCallback!=null) {
mBluetoothAdapter.getBluetoothLeScanner().startScan(mLeScanCallback);
mProgressDialog.show();
}
}
else
{
// mBluetoothAdapter.startLeScan(mLeScanCallbackFucksSamsung);
if(mBluetoothDevice == null) {
mBluetoothAdapter.startLeScan(mLeScanCallbackFucksSamsung);
mProgressDialog.show();
}
else
{
iBluetoothLeService = new Intent(activitycontext,BluetoothLeService.class);
isBond = activitycontext.bindService(iBluetoothLeService, mServiceConnection, Context.BIND_AUTO_CREATE);
}
}
}
else
{
Toast.makeText(activitycontext, "Please switch on bluetooth", Toast.LENGTH_LONG).show();
}
}
public void setOnDataReceivedListener(OnDataReceivedListener onDataREceivedListener)
{
this.onDataReceivedListener = onDataREceivedListener;
}
public void setOnStateChangeListener(OnStateChangedListener onStateChangeListener)
{
this.onStateChangedListener = onStateChangeListener;
}
private final BroadcastReceiver bluetoothDataReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
int id = intent.getIntExtra("id",-1);
final int value = intent.getIntExtra("value",-1);
Log.d("flip","id = "+id +" value = "+value);
switch(id)
{
case 0:
x_p = x_e;
P_p = P_e + Q;
K = P_p/(P_p+RM);
x_e = x_p + K*(value - x_p);
P_e = (1-K)*P_p;
int k_value = (int) x_e;
if(onDataReceivedListener!=null)
onDataReceivedListener.onHeartRateReceived(k_value);
break;
case 1:
if(onDataReceivedListener!=null)
onDataReceivedListener.onStepsReceived(value);
break;
case 2:
if(onStateChangedListener!=null)
onStateChangedListener.onStateChanged(STATE_CONNECTED);
Toast.makeText(activitycontext,"Device Connected",Toast.LENGTH_SHORT).show();
break;
case 3:
if(onStateChangedListener!=null)
onStateChangedListener.onStateChanged(STATE_DISCONNECTED);
Toast.makeText(activitycontext,"Device Disconnected",Toast.LENGTH_SHORT).show();
iBluetoothLeService = null;
activitycontext.unbindService(mServiceConnection);
break;
case 4:
if(onDataReceivedListener!=null)
onDataReceivedListener.onBatteryReceived(value);
break;
}
}
};
private BluetoothAdapter.LeScanCallback mLeScanCallbackFucksSamsung= new BluetoothAdapter.LeScanCallback(){
@Override
public void onLeScan(BluetoothDevice device, int rssi, byte[] scanRecord)
{
try {
if (device.getName().contains("FLIP9") || device.getName().contains("FLIP8")){
mProgressDialog.dismiss();
mBluetoothDevice = device;
iBluetoothLeService = new Intent(activitycontext,BluetoothLeService.class);
isBond = activitycontext.bindService(iBluetoothLeService, mServiceConnection, Context.BIND_AUTO_CREATE);
Log.d("flip", "device found");
mBluetoothAdapter.stopLeScan(mLeScanCallbackFucksSamsung);
}
}
catch (Exception ex) {
ex.printStackTrace();
}
}
};
private final ServiceConnection mServiceConnection = new ServiceConnection() {
BluetoothLeService mBluetoothLeService;
@Override
public void onServiceConnected(ComponentName componentName, IBinder service) {
mBluetoothLeService = ((BluetoothLeService.LocalBinder) service).getService();
mBluetoothLeService.initialize();
mBluetoothLeService.connect(mBluetoothDevice.getAddress());
}
@Override
public void onServiceDisconnected(ComponentName componentName) {
mBluetoothLeService = null;
}
};
public void disconnect()
{
if(mServiceConnection!=null && isBond)
{
activitycontext.unbindService(mServiceConnection);
}
activitycontext.unregisterReceiver(bluetoothDataReceiver);
}
答案 0 :(得分：0)
这是因为当活动被破坏时你与api断开连接。
@Override
protected void onDestroy() {
super.onDestroy();
flipApi.disconnect();
Log.d("On destroy","");
}
如果您希望您的api适用于所有活动，您可以将其移至应用程序类