WiFiManagerTest

WiFiManagerTest

안드로이드 버젼 7.0 지원하기 위한 버젼임.

 

- MainActivity.java

> OnCreate()에서 BroadcastReceiver 등록

> 퍼미션 요청 , ACCESS_FINE_LOCATION 

> onResume  에서 BroadcastReceiver   등록

> onPause 에서 BroadcastReceiver   해제

public class MainActivity extends AppCompatActivity {     private WifiManager wifiManager;     private List<ScanResult> scanDatas; // ScanResult List     final private BroadcastReceiver receiver = new BroadcastReceiver() {         @Override         public void onReceive(Context context, Intent intent) {             final String action = intent.getAction();             if (action.equals(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION)) {                 if (ActivityCompat.checkSelfPermission( context.getApplicationContext() , android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {                     // TODO: Consider calling                     //    ActivityCompat#requestPermissions                     // here to request the missing permissions, and then overriding                     //   public void onRequestPermissionsResult(int requestCode, String[] permissions,                     //                                          int[] grantResults)                     // to handle the case where the user grants the permission. See the documentation                     // for ActivityCompat#requestPermissions for more details.                     return;                 }                 scanDatas = wifiManager.getScanResults();                 Toast.makeText(context.getApplicationContext(), scanDatas.get(0).SSID, Toast.LENGTH_SHORT).show();             }else if(action.equals(WifiManager.NETWORK_STATE_CHANGED_ACTION)) {                 //sendBroadcast(new Intent("wifi.ON_NETWORK_STATE_CHANGED"));  //error                 context.sendBroadcast(new Intent("wifi.ON_NETWORK_STATE_CHANGED"));             }         }     };     //API Level 30 //    WifiManager.ScanResultsCallback callback = new WifiManager.ScanResultsCallback() { //        @Override //        public void onScanResultsAvailable() { //            // Handle scan results here // //        } //    }; //    Executor executor ; //    @RequiresApi(api = Build.VERSION_CODES.R)     @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);         String[] PERMS_INITIAL={                 // Manifest.permission.ACCESS_FINE_LOCATION,                 android.Manifest.permission.ACCESS_FINE_LOCATION ,         };         ActivityCompat.requestPermissions(this, PERMS_INITIAL, 127);         Button buttonScan = (Button) findViewById( R.id.btnStartScan) ;         buttonScan.setOnClickListener(new View.OnClickListener() {             @Override             public void onClick(View v) {                 wifiManager.startScan()  ;                 Log.d("WiFiManager" , "startScan() called--")  ;             }         });         //The WIFI_SERVICE must be looked up on the Application context or memory will leak on devices < Android N. Try changing `getSystemService` to `getApplicationContext().getSystemService`         wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);         //wifiManager = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);         if(!wifiManager.isWifiEnabled()){             wifiManager.setWifiEnabled(true);         }     }     @Override     protected void onResume() {         super.onResume();         if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.N){ // N=24, Android7.0 ,             // Do something for lollipop and above versions             //{{             IntentFilter intentFilter = new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION) ;             intentFilter.addAction( WifiManager.NETWORK_STATE_CHANGED_ACTION);             registerReceiver( receiver , intentFilter) ;             //}}         } else{             // do something for phones running an SDK before lollipop             Log.d("AndroidVersion" , "Version is below : " + android.os.Build.VERSION.SDK_INT)  ;         }     }     @Override     protected void onPause() {         super.onPause();         unregisterReceiver( receiver );     } }

 

- AndroidManifest.xml

> WiFi연결시 아래의 permission을 추가해줘야 함.

<uses-permission android:name="android.permission.ACCESS_FINE_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.INTERNET"/>     <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>

 

- build.gradle(:app)

> WiFiManagerTest\app\ 폴더에 있음.

>minSdk,  targetSdk 를 24로 설정후 에러가 없을려면

> dependencies  에서 material의 버젼을 1.5.0으로 설정해야함. 
>>   implementation 'com.google.android.material:material:1.5.0'

plugins {     id 'com.android.application' } android {     compileSdk 33     defaultConfig {         applicationId "com.example.wifimanagertest"         minSdk 24         targetSdk 24         versionCode 1         versionName "1.0"         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"     }     buildTypes {         release {             minifyEnabled false             proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'         }     }     compileOptions {         sourceCompatibility JavaVersion.VERSION_1_8         targetCompatibility JavaVersion.VERSION_1_8     } } dependencies {     implementation 'androidx.appcompat:appcompat:1.6.1'     implementation 'com.google.android.material:material:1.5.0'     implementation 'androidx.constraintlayout:constraintlayout:2.1.4'     testImplementation 'junit:junit:4.13.2'     androidTestImplementation 'androidx.test.ext:junit:1.1.5'     androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.1' }