안드로이드 WIfiManager 로 주변 wifi 스캔하기! Android WifiManager scan access point wifi list

공감 및 댓글은 포스팅 하는데  아주아주 큰 힘이 됩니다!! 포스팅 내용이 찾아주신 분들께  도움이 되길 바라며 더 깔끔하고 좋은 포스팅을  만들어 나가겠습니다^^

이번 포스팅에서는 WifiManager 클래스를 사용해서 주변 ap(Access Point) wifi목록을

스캔하는 예제입니다.

실행 결과 먼저 보여드립니다.

아래 정보들 말고도 더 확인할 수 있는데, 저는 이렇게만 만들었습니다.

먼저

Manifest.xml에 아래 퍼미션들을 추가해줍니다.

<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>
<uses-permission android:name="android.permission.CHANGE_WIFI_MULTICAST_STATE"/>
<uses-feature android:name="android.hardware.wifi"/>

그리고 저는 데이터 바인딩을 사용하기 때문에

build.gradle(Module:app) 을 열어

android{} 중괄호 블록 내부에

dataBinding {
    enabled true
}

데이터 바인딩을 허용하는 코드를 넣어줍니다.

그리고 레이아웃에서 저는 CardView 와 RecyclerView를 둘 다 사용했는데요.

그래서 

dependencies {

}

블록에 아래 3가지를 implementation해줍니다.

implementation 'com.android.support:design:27.1.1'
implementation 'com.android.support:cardview-v7:27.1.1'
implementation 'com.android.support:recyclerview-v7:27.1.1'

데이터를 담을 AccessPoint 클래스와 RecyclerView에 데이터를 넣어주고 처리하기 위한

RecyclerViewAdapter 클래스를 상속 받는 AccessPointAdapter 도 만드러 줍니다.

AccessPoint.java

public class AccessPoint {
 
    private String ssid;
    private String bssid;
    private String rssi;
 
    public AccessPoint(String ssid, String bssid, String rssi) {
        this.ssid = ssid;
        this.bssid = bssid;
        this.rssi = rssi;
    }
 
    public String getSsid() {
        return ssid;
    }
 
    public String getBssid() {
        return bssid;
    }
 
    public String getRssi() {
        return rssi;
    }
}
 

AccessPointAdapter.java

public class AccessPointAdapter extends RecyclerView.Adapter {
 
    private Vector<AccessPoint> accessPoints;
    private Context context;
 
    AccessPointAdapter(Vector<AccessPoint> accessPoints, Context context) {
        this.accessPoints = accessPoints;
        this.context = context;
    }
 
    @NonNull
    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        RecyclerView.ViewHolder holder;
        ItemAccesspointBinding binding = ItemAccesspointBinding.inflate(LayoutInflater.from(context), parent, false);
        holder = new AccessPointHolder(binding);
        return holder;
    }
 
    @Override
    public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {
        AccessPointHolder accessPointHolder = (AccessPointHolder)holder;
        final ItemAccesspointBinding binding = accessPointHolder.binding;
        binding.cardView.setRadius(20.0f);
        String ssid = "SSID : " + accessPoints.get(position).getSsid();
        String bSsid = "BSSID : " + accessPoints.get(position).getBssid();
        String rssi = "RSSI : " + accessPoints.get(position).getRssi();
        binding.ssidTextView.setText(ssid);
        binding.bssidTextView.setText(bSsid);
        binding.rssiLevelTextView.setText(rssi);
 
    }
 
    @Override
    public int getItemCount() {
        return accessPoints.size();
    }
 
    private class AccessPointHolder extends RecyclerView.ViewHolder {
        ItemAccesspointBinding binding;
 
        AccessPointHolder(ItemAccesspointBinding binding) {
            super(binding.getRoot());
            this.binding = binding;
        }
    }
 
}
 

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---

---

이제 xml 차례입니다.

recyclerView의 아이템으로 들어갈 layout

item_accesspoint.xml

<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">
 
    <android.support.v7.widget.CardView
        android:layout_margin="10dp"
        android:id="@+id/cardView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
 
        <android.support.constraint.ConstraintLayout
            android:padding="10dp"
            android:background="@color/colorAccent"
            android:id="@+id/cardLayout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
            <TextView
                app:layout_constraintTop_toTopOf="@+id/cardLayout"
                app:layout_constraintStart_toStartOf="@+id/cardLayout"
                app:layout_constraintBottom_toTopOf="@+id/bssidTextView"
                android:id="@+id/ssidTextView"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textSize="@dimen/textSize"/>
            <TextView
                app:layout_constraintStart_toStartOf="@+id/ssidTextView"
                app:layout_constraintTop_toBottomOf="@+id/ssidTextView"
                app:layout_constraintBottom_toTopOf="@+id/rssiLevelTextView"
                android:id="@+id/bssidTextView"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textSize="@dimen/textSize" />
            <TextView
                app:layout_constraintStart_toStartOf="@+id/ssidTextView"
                app:layout_constraintTop_toBottomOf="@+id/bssidTextView"
                app:layout_constraintBottom_toBottomOf="@+id/cardLayout"
                android:id="@+id/rssiLevelTextView"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textSize="@dimen/textSize" />
        </android.support.constraint.ConstraintLayout>
    </android.support.v7.widget.CardView>
 
</layout>

여기서 사용된 @dimen/textSize 는 20sp 입니다.

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools">
 
    <android.support.constraint.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context="wifi.rowan.com.wifilistscanner.MainActivity">
        <android.support.v7.widget.Toolbar
            android:background="@color/colorPrimary"
            android:id="@+id/toolbar"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintBottom_toTopOf="@+id/accessPointRecyclerView"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
            <TextView
                android:textColor="#FFFFFFFF"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="center"
                android:text="Wifi List"/>
        </android.support.v7.widget.Toolbar>
        <android.support.v7.widget.RecyclerView
            app:layout_constraintTop_toBottomOf="@+id/toolbar"
            app:layout_constraintBottom_toBottomOf="parent"
            android:id="@+id/accessPointRecyclerView"
            android:layout_width="match_parent"
            android:layout_height="0dp"/>
    </android.support.constraint.ConstraintLayout>
</layout>

마지막으로

MainActivity.java

public class MainActivity extends AppCompatActivity {
 
    Vector<AccessPoint> accessPoints;
    LinearLayoutManager linearLayoutManager;
    AccessPointAdapter accessPointAdapter;
    WifiManager wifiManager;
    List<ScanResult> scanResult;
    ActivityMainBinding binding;
    /* Location permission 을 위한 필드 */
    public static final int MULTIPLE_PERMISSIONS = 10; // code you want.
    // 원하는 권한을 배열로 넣어줍니다.
    String[] permissions = new String[]{
            Manifest.permission.ACCESS_COARSE_LOCATION
    };
    /* Location permission 을 위한 필드 */
 
    @Override
    protected void onStart() {
        super.onStart();
        if (Build.VERSION.SDK_INT >= 23) {
            if (!checkPermissions()) {
                finish();
            }
        }
    }
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        binding = DataBindingUtil.setContentView(this, R.layout.activity_main);
        wifiManager = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);
        linearLayoutManager = new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false);
        binding.accessPointRecyclerView.setLayoutManager(linearLayoutManager);
        accessPoints = new Vector<>();
        if (wifiManager != null) {
            if (!wifiManager.isWifiEnabled()) {
                wifiManager.setWifiEnabled(true);
            }
            final IntentFilter filter = new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION);
            filter.addAction(WifiManager.NETWORK_STATE_CHANGED_ACTION);
            registerReceiver(mWifiScanReceiver, filter);
            wifiManager.startScan();
        }
    }
 
 
    private BroadcastReceiver mWifiScanReceiver = new BroadcastReceiver() {
 
        @Override
        public void onReceive(Context context, Intent intent) {
            final String action = intent.getAction();
            if (action != null) {
                if (action.equals(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION)) {
                    getWIFIScanResult();
                    wifiManager.startScan();
                } else if (action.equals(WifiManager.NETWORK_STATE_CHANGED_ACTION)) {
                    context.sendBroadcast(new Intent("wifi.ON_NETWORK_STATE_CHANGED"));
                }
 
            }
 
        }
    };
 
    public void getWIFIScanResult() {
        scanResult = wifiManager.getScanResults();
        if (accessPoints.size() != 0) {
            accessPoints.clear();
        }
        for (int i = 0; i < scanResult.size(); i++) {
            ScanResult result = scanResult.get(i);
            if (result.frequency < 3000) {
                Log.d(". SSID : " + result.SSID,
                        result.level + ", " + result.BSSID);
                accessPoints.add(new AccessPoint(result.SSID, result.BSSID, String.valueOf(result.level)));
            }
        }
        accessPointAdapter = new AccessPointAdapter(accessPoints, MainActivity.this);
        binding.accessPointRecyclerView.setAdapter(accessPointAdapter);
        accessPointAdapter.notifyDataSetChanged();
    }
 
    @Override
    protected void onDestroy() {
        super.onDestroy();
        unregisterReceiver(mWifiScanReceiver);
    }
 
    /* Location permission 을 위한 메서드들 */
    private boolean checkPermissions() {
        int result;
        List<String> listPermissionsNeeded = new ArrayList<>();
        for (String p : permissions) {
            result = ContextCompat.checkSelfPermission(MainActivity.this, p);
            if (result != PackageManager.PERMISSION_GRANTED) {
                listPermissionsNeeded.add(p);
            }
        }
        if (!listPermissionsNeeded.isEmpty()) {
            ActivityCompat.requestPermissions(MainActivity.this, listPermissionsNeeded.toArray(new String[listPermissionsNeeded.size()]), MULTIPLE_PERMISSIONS);
            return false;
        }
        return true;
    }
 
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String permissions[], @NonNull int[] grantResults) {
        switch (requestCode) {
            case MULTIPLE_PERMISSIONS: {
                if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    Log.d("permission", "granted");
                }
            }
        }
    }
/* Location permission 을 위한 메서드들 */
}
 

코드를 보고 순서대로 따라하시면 큰 어려움 없이 하실 수 있을 거에요^^

이상입니다.

감사합니다.