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Sample code for main activity import android.os.Bundle; import android.util.Log; import android.view.View; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.EditText; import android.widget.ListView; import android.widget.Toast;

import java.io.IOException; import java.util.Observable; import java.util.Observer;

public class MainActivity extends BluetoothActivity { com.example.thispc.testlibrary.BluetoothManager bm; receiceMessage rm; DeviceList dl; String type = ""; ListView l; int c=0; EditText et1; EditText et2; private ArrayAdapter adapter;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    bm= com.example.thispc.testlibrary.BluetoothManager.getInstance();
    rm = new receiceMessage();
    dl=new DeviceList();
    l = (ListView) findViewById(R.id.listView);
    et1=(EditText)findViewById(R.id.editText);
    et2=(EditText)findViewById(R.id.editText2);
    l.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            String itemValue = (String) l.getItemAtPosition(position);
            bm.connectTo(itemValue);
        }
    });
    adapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1);
    l.setAdapter(adapter);
}

public void client(View v) {
    type = "client";
    bm.Type(type);
}

public void server(View v) {
    type = "server";
    bm.Type(type);
}

public void disconnect(View v) { Toast.makeText(getApplicationContext(), bm.disconnect(),Toast.LENGTH_LONG).show(); } public void clienttoclient (View v) { bm.clientToClient(et1.getText().toString(), Integer.parseInt(et2.getText().toString())); } public void devicelist(View v) { Toast.makeText(getApplicationContext(), bm.getAllConnectedDevices(),Toast.LENGTH_LONG).show(); } public void start(View v) { bm.setMessageObject(rm); bm.setListObject(dl); if (type.equals("client")) { enableBluetooth(); } if (type.equals("server")) { enableBluetooth(); } } public void send(View v) { if (type.equals("client")) { bm.sendText(et1.getText().toString()); } if (type.equals("server")) { bm.sendText(et1.getText().toString(),Integer.parseInt(et2.getText().toString())); } } class receiceMessage implements Observer { @Override public void update(Observable observable, Object data) { Log.e("pulkit", "in received"); final String msg = ((receivemsg)observable).getMessage(); runOnUiThread(new Runnable() { public void run() { Toast.makeText(MainActivity.this,msg,Toast.LENGTH_LONG).show(); } }); } } class DeviceList implements Observer { @Override public void update(Observable observable, Object data) { if(((deviceList)observable).getContent().equals("bluetooth enabled")) { bm.scanClients(); }else adapter.add(((deviceList)observable).getContent()); } } }