CODEWITHSUNDEEP
javaandroidbluetooth
Spotty
Spotty

Reputation: 307

Passing Mac address of bluetooth to other activity

debug image hereBluetoothActivity.Java [debug image 2][2]

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.bluetooth_main);
        //myLabel = (TextView)findViewById(R.id.label);
        toggleButton = (ToggleButton) findViewById(R.id.toggleButton);
        listview = (ListView) findViewById(R.id.listView);
        // ListView Item Click Listener
        listview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                                    int position, long id) {
                // ListView Clicked item value
                String  itemValue = (String) listview.getItemAtPosition(position);
                Toast.makeText(getApplicationContext(), "clicked", Toast.LENGTH_LONG).show();
                String MAC = itemValue.substring(itemValue.length() - 17);
                Intent intent = new Intent(getApplicationContext(),Bluetooth_dataDisplay.class);
                intent.putExtra("MAC",MAC);
                startActivity(intent);
                //BluetoothDevice bluetoothDevice = mBluetoothAdapter.getRemoteDevice(MAC);
                // Initiate a connection request in a separate thread
                //ConnectingThread t = new ConnectingThread(bluetoothDevice);
                //t.start();
            }
        });

        adapter = new ArrayAdapter
                (this,android.R.layout.simple_list_item_1);
        listview.setAdapter(adapter);

        //verify bluetooth is supported on the device
        mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
        // Device does not support Bluetooth
        if (mBluetoothAdapter == null) {
        }

    }//end oncreate

Bluetooth_datadisplay.Javabluetooth_datadisplay image

 @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.bluetooth_datadisplay);

        myLabel = (TextView)findViewById(R.id.label);

        String MAC = getIntent().getStringExtra("MAC");

        BluetoothDevice bluetoothDevice = mAdapter.getRemoteDevice(MAC);

        // Initiate a connection request in a separate thread
        ConnectingThread t = new ConnectingThread(bluetoothDevice);

        t.start();

    }//end oncreate

Error

Attempt to invoke virtual method 'android.bluetooth.BluetoothDevice android.bluetooth.BluetoothAdapter.getRemoteDevice(java.lang.String)' on a null object reference

Hi I trying to pass the Mac address of the bluetooth to bluetooth datadisplay. But I got the above error. Can anyone explain to me what wrong? Thank you!

Upvotes: 0

Views: 457

Answers (1)

Hiren Patel
Hiren Patel

Reputation: 52810

You have not defined object of mAdapter.

BluetoothAdapter mAdapter = BluetoothAdapter.getDefaultAdapter();    
BluetoothDevice bluetoothDevice = mAdapter.getRemoteDevice(MAC);

Hope this will help you.

Upvotes: 1

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