显示周围的蓝牙设备

布局文件有一个listview就行

public class ConnectActivity extends Activity{    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        initView();        initBT();        listView.setAdapter(adapter);    }    void initView(){        setContentView(R.layout.activity_connect);        listView= (ListView) findViewById(R.id.lv_connect);        int layout=android.R.layout.simple_list_item_1;        //注意这个构造函数，别忘了<>        adapter=new ArrayAdapter<>(context,layout,name);    }    //打开蓝牙和启动扫描    void initBT(){        btA=BluetoothAdapter.getDefaultAdapter();        if (!btA.isEnabled()){//需要权限            String string=BluetoothAdapter.ACTION_REQUEST_ENABLE;            Intent intent=new Intent(string);            startActivityForResult(intent,0);        }        String found_bt=BluetoothDevice.ACTION_FOUND;        registerReceiver(br, new IntentFilter(found_bt));        name.clear();        mac.clear();        btA.startDiscovery();//要蓝牙权限    }    //启动这个活动的方法    public static void startCA(Context context){        Intent intent=new Intent(context,ConnectActivity.class);        //注意这一句        context.startActivity(intent);    }    Context context=this;    ListView listView;    ArrayAdapter<String> adapter;    BluetoothAdapter btA;    List<String> name=new ArrayList<>();    List<BluetoothDevice> mac=new ArrayList<>();    //在这里为集合添加数据    BroadcastReceiver br=new BroadcastReceiver() {        @Override        public void onReceive(Context context, Intent intent) {            String bt_name=BluetoothDevice.EXTRA_NAME;            String bt_mac=BluetoothDevice.EXTRA_DEVICE;            name.add(intent.getStringExtra(bt_name));            BluetoothDevice bd=intent.getParcelableExtra(bt_mac);            mac.add(bd);            adapter.notifyDataSetChanged();        }    };}

我写代码习惯照AS的structure格式写，就是类，然后方法，最后常量或变量