public interface ScanWiFIScanListener {    void scanList(List<INfo> list);}public class INfo {    String ssid;//    String capabilities;//    String bssid;//    int level;//信号强度-20到0是最强的    public String getSsid() {        return ssid;    }    public void setSsid(String ssid) {        this.ssid = ssid;    }    public String getCapabilities() {        return capabilities;    }    public void setCapabilities(String capabilities) {        this.capabilities = capabilities;    }    public String getBssid() {        return bssid;    }    public void setBssid(String bssid) {        this.bssid = bssid;    }    public int getLevel() {        return level;    }    public void setLevel(int level) {        this.level = level;    }    @Override    public String toString() {        return "INfo [ssid=" + ssid + ", capabilities=" + capabilities                + ", bssid=" + bssid + ", level=" + level + "]";    }}public class MyB extends BroadcastReceiver{    WifiManager wifiManager;    ScanWiFIScanListener listener;//传到activity那边        public ScanWiFIScanListener getListener() {        return listener;    }    public void setListener(ScanWiFIScanListener listener) {        this.listener = listener;    }    //拿到收到的wifi    public MyB(WifiManager wifiManager) {        super();        this.wifiManager = wifiManager;    }    @Override    public void onReceive(Context context, Intent intent) {        Log.i("INFO", "wifi is founded");        //动态注册，代码注册        //通过意图拿        List<ScanResult> list= wifiManager.getScanResults();        List<INfo> infos=new ArrayList<INfo>();        for (ScanResult scanResult : list) {            Log.i("INFO", scanResult.SSID);            //没每个实体赋值添加到集合            INfo info=new INfo();            info.setBssid(scanResult.BSSID);            info.setCapabilities(scanResult.capabilities);            info.setLevel(scanResult.level);                        infos.add(info);        }        //蓝牙是异步扫描，wifi是同步扫描，一下子扫到        listener.scanList(infos);        }}@Override    public View getView(int position, View convertView, ViewGroup parent) {        LayoutInflater inflater=(LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);        View vv=inflater.inflate(R.layout.list_item, null);        TextView tv_ssid=(TextView) vv.findViewById(R.id.tv_ssid);        TextView tv_bbid=(TextView) vv.findViewById(R.id.tv_bbid);        TextView tv_p=(TextView) vv.findViewById(R.id.tv_p);        ImageView iv_level=(ImageView) vv.findViewById(R.id.iv_level);        iNfo=list.get(position);                tv_ssid.setText(iNfo.getSsid());        tv_bbid.setText(iNfo.getBssid());        tv_p.setText(iNfo.getCapabilities());                //判断level在那个区间        //drawable        int level = iNfo.getLevel();        iv_level.setImageResource(R.drawable.image_level);        if(-100<level&&level<-80){            iv_level.setImageLevel(0);        }else if(level<-60){            iv_level.setImageLevel(1);        }else if(level<-40){            iv_level.setImageLevel(2);        }else if(level<-20){            iv_level.setImageLevel(3);        }else{            iv_level.setImageLevel(4);        }                //img.setImageLevel(0);        return vv;    }public class MainActivity extends Activity implements ScanWiFIScanListener {    ListView lv;    MyB b;    WifiManager wifiManager;    MyAdapter adapter;    List<INfo> list;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        lv = (ListView) findViewById(R.id.lv);        wifiManager = (WifiManager) this.getSystemService(Context.WIFI_SERVICE);        b = new MyB(wifiManager);        b.setListener(this);//        List<INfo> list = new ArrayList<INfo>();        adapter = new MyAdapter(this, list);        lv.setAdapter(adapter);    }    public void scanwifi(View v) {        if (!wifiManager.isWifiEnabled()) {// 是否可用            wifiManager.setWifiEnabled(true);// 打开        }        wifiManager.startScan();// 开始扫描        // 注册广播        IntentFilter intentFilter = new IntentFilter();        intentFilter.addAction(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION);// 扫描结果可用，可拿到        this.registerReceiver(b, intentFilter);        // 扫描到就放进去        adapter.getList().clear();        adapter.notifyDataSetChanged();    }    @Override    public void scanList(List<INfo> list) {        // TODO Auto-generated method stub        // 设置给adapter,刷新listView        adapter.setList(list);        adapter.notifyDataSetChanged();    }}