Android WiFi 无法从 ScanResult 获取 SSID 和 BSSID

Question

我得到了这个代码，我想扫描网络，然后将其全部写入列表视图。但问题是ssid和bssid没有显示。其他所有内容都显示，但不是 ssid。

另外，每秒更新列表视图的最佳方法是什么，以便您可以看到信号强度的实际信号？

import java.util.List;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.net.wifi.ScanResult;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import com.example.wifi.R;
public class MainActivity extends Activity {
    WifiManager wifiManager;
    WifiScanReceiver wifiReciever;
    ListView list;
    String wifis[];
    WifiInfo wifiInfo;
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        list = (ListView) findViewById(R.id.text);
        wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
        wifiReciever = new WifiScanReceiver();
        wifiInfo = wifiManager.getConnectionInfo();
        wifiManager.startScan();
    }

    protected void onPause() {
        unregisterReceiver(wifiReciever);
        super.onPause();
    }
    protected void onResume() {
        registerReceiver(wifiReciever, new IntentFilter(
                WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
        super.onResume();
    }
    class WifiScanReceiver extends BroadcastReceiver {
        @SuppressLint("UseValueOf")
        public void onReceive(Context c, Intent intent) {
            List<ScanResult> wifiScanList = wifiManager.getScanResults();
            wifis = new String[wifiScanList.size()];
            for (int i = 0; i < wifiScanList.size(); i++) {
                wifis[i] = ((wifiScanList.get(i)).toString());
            }
            list.setAdapter(new ArrayAdapter<String>(getApplicationContext(),
                    android.R.layout.simple_list_item_1, wifis));
        }
    }
}

Answer 1

您可以使用

wifiScanList.get(i).SSID和wifiScanList.get(i).BSSID从ScanResult对象获取SSID和BSSID。 然后只需将其附加到从toString()返回的其他数据即可。

请参阅此处的文档。

首先，将ArrayAdapter声明为实例变量，并在onCreate()中调用setAdapter()：

ArrayAdapter adapter;
ListView list;
ArrayList<String> wifis;
WifiInfo wifiInfo;
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    list = (ListView) findViewById(R.id.text);
    wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
    wifiReciever = new WifiScanReceiver();
    wifiInfo = wifiManager.getConnectionInfo();
    wifis = new ArrayList<String>(); //initialize wifis
    wifis.add("loading...");
    adapter = new ArrayAdapter<String>(getApplicationContext(),
                        android.R.layout.simple_list_item_1, wifis)
    list.setAdapter(adapter);
    wifiManager.startScan(); //make sure this is the last call
}

修改BroadcastReceiver：

class WifiScanReceiver extends BroadcastReceiver {
        @SuppressLint("UseValueOf")
        public void onReceive(Context c, Intent intent) {
            List<ScanResult> wifiScanList = wifiManager.getScanResults();
            //wifis = new String[wifiScanList.size()]; //remove this
            wifis.clear(); //add this
            for (int i = 0; i < wifiScanList.size(); i++) {
                String ssid = wifiScanList.get(i).SSID; //Get the SSID
                String bssid =  wifiScanList.get(i).BSSID //Get the BSSID
                //use add here:
                wifis.add( ssid + " " + bssid + " " +((wifiScanList.get(i)).toString()) ); //append to the other data
            }
            adapter.notifyDataSetChanged(); //add this
            wifiManager.startScan(); //start a new scan to update values faster
            //ArrayAdapter adapter = new ArrayAdapter<String>(getApplicationContext(),
             //       android.R.layout.simple_list_item_1, wifis)
            //list.setAdapter(adapter);
        }
    }

这仍然只会在每个扫描结果上更新。我不建议每秒更新一次ListView，您可能需要重新考虑显示 RSSI 水平的方法。您可以单击每个SSID，并有一个带有TextView的详细信息视图，您可以在其中每秒更新当前SSID的RSSI。