ANDROID:-无法使用ScanResult获取可用的wifi列表

问题描述

我正在尝试通过ScanResult列出可用的wifi网络.

I'm trying to list available wifi network by ScanResult.

谁能告诉我我的代码出了什么问题?我没有得到想要的输出.

Can anyone tell me what's wrong in my code? I'm not getting the desired output.

这是我的代码:

public class Activity_scanwifi extends AppCompatActivity {

    Switch aSwitch;
    TextView textView;
    WifiManager wifiManager;
    WifiInfo wifiInfo;
    String info;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.scanwifi);

        aSwitch=(Switch) findViewById(R.id.s);
        textView=(TextView) findViewById(R.id.textView);
        wifiManager=(WifiManager) getSystemService(Context.WIFI_SERVICE);
        wifiManager.startScan();

        aSwitch.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                // switch on
                if(isChecked && ! wifiManager.isWifiEnabled())
                {
                    wifiManager.setWifiEnabled(true);
                    wifiInfo=wifiManager.getConnectionInfo();
                }
                // switch off
                if (!isChecked && wifiManager.isWifiEnabled())
                {
                  wifiManager.setWifiEnabled(false);
                }
            }
        });
        broadcast b=new broadcast();
        registerReceiver(b,new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
    }

    public class broadcast extends BroadcastReceiver{
        @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
        @Override
        public void onReceive(Context context, Intent intent) {
            // onReceive method updates any change in the available wifi
            StringBuffer stringBuffer=new StringBuffer();
           /// List<WifiConfiguration> list=wifiManager.getConfiguredNetworks();
            List<ScanResult> list=wifiManager.getScanResults();
            //for(WifiConfiguration wifiConfiguration : list)
            for(ScanResult scanResult : list)
            {
                stringBuffer.append(scanResult);
            }

            textView.setText(stringBuffer);

        }
    }
}

推荐答案

尝试此代码

WifiList.java

WifiList.java

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.WifiConfiguration;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.LinearLayout;
import android.widget.ListView;
import java.util.ArrayList;
import java.util.List;

import butterknife.BindView;
import butterknife.ButterKnife; 


public class WifiList extends Activity {

            WifiManager mWifiManager;
            ArrayList<String> mWifiList;

            @BindView(R.id.lst_wifilist)
            ListView lst_wifilist;

            @BindView(R.id.ll_scan)
            LinearLayout ll_scan;

            @Override
            protected void onCreate(@Nullable Bundle savedInstanceState) {
                super.onCreate(savedInstanceState);
                setContentView(R.layout.activity_wifilist);
                ButterKnife.bind(this);
                mWifiList = new ArrayList<>();
                mWifiManager = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);
                mWifiList.clear();

                scanNetwork();
    }

    private void scanNetwork() {
            registerReceiver(mWifiScanReceiver,
                    new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
            mWifiManager.startScan();
        }

        private final BroadcastReceiver mWifiScanReceiver = new BroadcastReceiver() {
            @Override
            public void onReceive(Context c, Intent intent) {
                if (intent.getAction().equals(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION)) {
                    List<ScanResult> mScanResults = mWifiManager.getScanResults();
                    // add your logic here
                    mWifiList.clear();
                    for (int i = 0; i < mScanResults.size(); i++) {
                        Log.e("Scanned Wifi Name :- ", mScanResults.get(i).SSID);
                        mWifiList.add(mScanResults.get(i).SSID);

                        WifiListAdapter adapter = new WifiListAdapter(WifiList.this, mWifiList);
                        lst_wifilist.setAdapter(adapter);
                    }
                }
            }
        };
    }

AndroidMenifest.xml

AndroidMenifest.xml

<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>

这篇关于ANDROID:-无法使用ScanResult获取可用的wifi列表的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！