android - 为什么没有调用 mConnection.onServiceConnected 方法

Question

public class DeviceScanActivity extends AppCompatActivity/*ListActivity*/ {
 @Override
    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);


        mHandler = new Handler();

        //mSend=new BluetoothSendRecv(cntxt);
        mActvty= this.getParent();
        visible = this.getIntent();
        requestPermissions(new String[]{Manifest.permission.ACCESS_COARSE_LOCATION}, PERMISSION_REQUEST_COARSE_LOCATION);
        // Use this check to determine whether BLE is supported on the device.  Then you can
        // selectively disable BLE-related features.
        if (!getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH_LE)) {
            Toast.makeText(this, R.string.ble_not_supported, Toast.LENGTH_SHORT).show();
            finish();
        }
        // Initializes a Bluetooth adapter.  For API level 18 and above, get a reference to
        // BluetoothAdapter through BluetoothManager.
        mBluetoothManager =(BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);
        mBluetoothAdapter = mBluetoothManager.getAdapter();
        // Checks if Bluetooth is supported on the device.
        if (mBluetoothAdapter == null ) {
            Toast.makeText(this, R.string.error_bluetooth_not_supported, Toast.LENGTH_SHORT).show();
            finish();
            return;
        }
        if( !mBluetoothAdapter.isEnabled())
        {
            Intent enableBluetooth = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
            startActivityForResult(enableBluetooth, 1);
        }
        if( !mBluetoothAdapter.isDiscovering()) {
            Intent discoverableIntent =
                    new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
            discoverableIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 300);
            startActivity(discoverableIntent);
        }
        // Construct the data source

        ArrayList<ViewHolder> arrayOfUsers = new ArrayList<ViewHolder>();

       // Create the adapter to convert the array to views

         adapter = new UsersAdapter(this, arrayOfUsers);
         cntxt=this.getApplicationContext();
        ListView listView = (ListView) findViewById(R.id.mobile_list);
        listView.setAdapter(adapter);
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position,
                                    long id) {
                ViewHolder entry= (ViewHolder) parent.getAdapter().getItem(position);
                mAddress = entry.deviceAddress;
                Toast.makeText(cntxt, mAddress, Toast.LENGTH_SHORT).show();
                Intent i = new Intent(cntxt, BluetoothLeService.class);
                cntxt.startService(i);
                bindService(visible, mConnection, BIND_AUTO_CREATE);; //if checked, start service
                //final BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(address);
                //mBluetoothService.mBluetoothDeviceAddress=address;
                //mBluetoothService.mBluetoothManager=mBluetoothManager;
                //mBluetoothService.mBluetoothAdapter = mBluetoothAdapter;
                //mBluetoothService.mBluetoothGatt.connect();
                /*mBluetoothService.mBluetoothGatt = */
                //mSend.mBluetoothGatt=device.connectGatt(mActvty/*cntxt*/, false, mSend.mGattCallback);
                //mSend.mBluetoothDeviceAddress=address;
                //mSend.mBluetoothManager=mBluetoothManager;
                //mSend.mBluetoothAdapter = mBluetoothAdapter;
                //mSend.mBluetoothGatt.connect();
                //mBluetoothService.mBluetoothGatt=mBluetoothGatt;
                //Toast.makeText(this, R.string.error_bluetooth_not_supported, Toast.LENGTH_SHORT).show();
            }});
        ViewHolder newUser2 = new ViewHolder("adtv2","vvg2");
         adapter.add(newUser2);

    }
    ServiceConnection mConnection = new ServiceConnection() {
        @Override
        public void onServiceDisconnected(ComponentName name) {
            //Toast.makeText(Client.this, "Service is disconnected", 1000).show();
            mBounded = false;
            mBluetoothService = null;
        }
        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            //Toast.makeText(Client.this, "Service is connected", 1000).show();
            mBounded = true;
            BluetoothLeService.LocalBinder mLocalBinder = (BluetoothLeService.LocalBinder)service;
            Toast.makeText(cntxt, "Mithun", Toast.LENGTH_SHORT).show();
            mBluetoothService = mLocalBinder.getService();
            if (!mBluetoothService.initialize()) {
                //Log.e(TAG, "Unable to initialize Bluetooth");
                finish();
            }
            // Automatically connects to the device upon successful start-up
            // initialization.
            mBluetoothService.connect(mAddress);
        }
    };

创建了第一个蓝牙管理器。由此创建了蓝牙适配器。然后调用RequestPermission。然后调用scanLeDevice。蓝牙扫描持续“周期”秒。结果存储在ArrayList中。为ArrayList和 View 创建Adapter。结果显示在 ListView 中。单击列表中的每个项目时，将调用 onItemClick 方法。我们通过适配器返回发现的设备特征。Intentis 为服务创建。向服务传递 mConnection 方法。但 onServiceConnected 方法没有被调用，因为“Mithun”没有被打印。

Answer 1

你搞砸了 Intent 。应该是。

 Intent i = new Intent(cntxt, BluetoothLeService.class);
 cntxt.startService(i);
 bindService(i, mConnection, BIND_AUTO_CREATE);

此外，如果此 Service 仅服务于 Activity，则您不必使用 startService() 。 Bounded Service 和 Started Service 是不同的。阅读 Bound services 并决定您是否需要启动服务或仅需要绑定(bind)服务。而服务可以同时启动和绑定(bind)。您可以在上面的链接中阅读更多内容。