How to Get Android Wifi Scan Results into a List

How can I get Android Wifi Scan Results into a list?

Try this code

public class WiFiDemo extends Activity implements OnClickListener
 {      
    WifiManager wifi;       
    ListView lv;
    TextView textStatus;
    Button buttonScan;
    int size = 0;
    List<ScanResult> results;

    String ITEM_KEY = "key";
    ArrayList<HashMap<String, String>> arraylist = new ArrayList<HashMap<String, String>>();
    SimpleAdapter adapter;

    /* Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        textStatus = (TextView) findViewById(R.id.textStatus);
        buttonScan = (Button) findViewById(R.id.buttonScan);
        buttonScan.setOnClickListener(this);
        lv = (ListView)findViewById(R.id.list);

        wifi = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);
        if (wifi.isWifiEnabled() == false)
        {
            Toast.makeText(getApplicationContext(), "wifi is disabled..making it enabled", Toast.LENGTH_LONG).show();
            wifi.setWifiEnabled(true);
        }   
        this.adapter = new SimpleAdapter(WiFiDemo.this, arraylist, R.layout.row, new String[] { ITEM_KEY }, new int[] { R.id.list_value });
        lv.setAdapter(this.adapter);

        registerReceiver(new BroadcastReceiver()
        {
            @Override
            public void onReceive(Context c, Intent intent) 
            {
               results = wifi.getScanResults();
               size = results.size();
            }
        }, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));                    
    }

    public void onClick(View view) 
    {
        arraylist.clear();          
        wifi.startScan();

        Toast.makeText(this, "Scanning...." + size, Toast.LENGTH_SHORT).show();
        try 
        {
            size = size - 1;
            while (size >= 0) 
            {   
                HashMap<String, String> item = new HashMap<String, String>();                       
                item.put(ITEM_KEY, results.get(size).SSID + "  " + results.get(size).capabilities);

                arraylist.add(item);
                size--;
                adapter.notifyDataSetChanged();                 
            } 
        }
        catch (Exception e)
        { }         
    }    
}

WiFiDemo.xml :

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_margin="16dp"
    android:orientation="vertical">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center_vertical"
        android:orientation="horizontal">

        <TextView
            android:id="@+id/textStatus"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="Status" />

        <Button
            android:id="@+id/buttonScan"
            android:layout_width="wrap_content"
            android:layout_height="40dp"
            android:text="Scan" />
    </LinearLayout>

    <ListView
        android:id="@+id/list"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginTop="20dp"></ListView>
</LinearLayout>

For ListView- row.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:padding="8dp">

    <TextView
        android:id="@+id/list_value"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="14dp" />
</LinearLayout>

Add these permission in AndroidManifest.xml

<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

Android Wifi Scanner NOT SHOWING RESULTS IN LISTVIEW

@AfterPermissionGranted(123)
    public void scanWifi() {

        String[] perm = {Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.ACCESS_COARSE_LOCATION,Manifest.permission.ACCESS_WIFI_STATE,Manifest.permission.CHANGE_WIFI_STATE};

        if(EasyPermissions.hasPermissions(this,perm)){

            registerReceiver(wifiReceiver, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
            boolean scanStarted = wifiManager.startScan();

            if (scanStarted) {
                Toast.makeText(this, "Scanning true", Toast.LENGTH_SHORT).show();
            }else{
                Toast.makeText(this, "Scanning false", Toast.LENGTH_SHORT).show();
            }
        Toast.makeText(this,"PERMISSIONS HAVE BEEN GRANTED",Toast.LENGTH_SHORT).show();

        }else{
            EasyPermissions.requestPermissions(this,"WE REQUIRE THESE PERMISSIONS FOR THE APP TO FUNCTION",123,perm);
        }

---

Gradle dependencies add

"implementation 'pub.devrel:easypermissions:2.0.1'" and compile

Using the easy permissions library I was able to solve the problem and introduce a more maintainable code.

Get WiFi Scan Results List With Kotlin

You forgot to start scanning. Add wifiManager.startScan() call in your startScanning method.

How to get the true wifi scan results updated with the time

The problem comes from android 9.0
The latest version of android (android 9 (Pie)) had a new restrictions and limitations for WIFI scanning, as it is documented by android. They add throttling for the scan intervals for both of foreground and background scenarios to save the power consumption.
Android 9 and later: Each foreground app can scan four times in a 2-minute period. This allows for a burst of scans in a short time. All background apps combined can scan one time in a 30-minute period.
android wifi scan
The following links represent the response of this throttling:
links represent the response of this throttling, link 2, link 3, link 4

Get available wi-fi scan result in customized listview

Add the following after your loop

String filtered[] = new String[wifiScanList.size()];
            int counter = 0;
            for (String eachWifi : wifis) {
                String[] temp = eachWifi.split(",");
                filtered[counter] = temp[0] +temp[2] +temp[3];//0->SSID, 2->Key Management 3-> Strength
                counter++;
            }
            list.setAdapter(new ArrayAdapter<String>(getApplicationContext(),
                    android.R.layout.simple_list_item_1, filtered));

To remove extra words you can do the following:

temp[0].substring(5).trim() 

This removes the first 5 characters and trims any whitespace. Do similar to others as well. And use \n to get on next line.

Or best idea would be use custom adapter.
See my answer here

Good luck.

How to filter a specific SSID from scan result in android?

Just change to this:

for (scanResult in results) {
    if (!scanResult.SSID.contains("_") {
        arrayList.add(scanResult.SSID)
        adapter!!.notifyDataSetChanged()
    }
}

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