3
我binding到service在3個活動中，在2它運作良好，但在第3我有一個錯誤。Bindservice錯誤
這裏是我的服務：
public class ClientBluetoothService extends Service {
private Handler handler = new Handler();
private final IBinder mBinder = new LocalBinder();
private ClientBluetooth clientBT;
public class LocalBinder extends Binder {
ClientBluetoothService getSerivce() {
return ClientBluetoothService.this;
}
}
public ClientBluetoothService() {
clientBT = new ClientBluetooth();
}
@Override
public IBinder onBind(Intent intent) {
return mBinder;
}
public void generateToast() {
Log.d("HERE", "Service: generateToast()");
Toast.makeText(getApplicationContext(), "WITAJ W SERWISIE", Toast.LENGTH_SHORT).show();
}
public void newClient() {
clientBT = new ClientBluetooth();
}
public void start() {
clientBT.start();
}
public String getStatus() {
return clientBT.getStatus();
}
public void disconnect() throws IOException {
clientBT.disconnect();
}
}
這裏是我的活動中，我有一個錯誤：
public class MeasureActivity extends AppCompatActivity {
protected boolean mBound = false;
private ClientBluetoothService clientBluetoothService;
private TextView textView;
@Override
protected void onStart() {
super.onStart();
Intent intent = new Intent(this, ClientBluetoothService.class);
bindService(intent, mConnection, Context.BIND_AUTO_CREATE);
Log.d("HERE", "Measure: onStart()");
}
@Override
protected void onStop() {
super.onStop();
if (mBound) {
unbindService(mConnection);
mBound = false;
}
}
@Override
public void setTitle(CharSequence title) {
super.setTitle(title);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_measure);
setTitle("Measure");
textView = (TextView)findViewById(R.id.textView);
clientBluetoothService.generateToast();
}
private ServiceConnection mConnection = new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName className, IBinder service) {
ClientBluetoothService.LocalBinder binder = (ClientBluetoothService.LocalBinder) service;
clientBluetoothService = binder.getSerivce();
mBound = true;
}
@Override
public void onServiceDisconnected(ComponentName arg0) {
mBound = false;
}
};
}
而且我得到了一個錯誤：
java.lang.NullPointerException: Attempt to invoke virtual method 'void com.gmail.krakow.michalt.myecg.ClientBluetoothService.generateToast()' on a null object reference