Android下自动连接指定SSID的WIFI的简单实现 |
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一、关于WiFi模块的概述：
1.在Android developer的文档中WiFi模块的信息： 首先，登记广播的监听；其次，请求扫描wifi信号；最后获取扫描到的wifi信息。 2.在广播监听到结果后，创建出WifiManager的对象之后通过getScanResults()方法获取到扫描wifi的对象信息。 二、指定SSID和密码进行wifi的自动连接： 需求分析：在很多的智能设备上并没有可用于交互的界面。这种情形在智能设备就可以提供指定SSID和密码的wifi自动连接。1.创建一个管理类用于管理wifi的状态、连接动作的各类信息： public class WIFIConnectionManager { private static final String TAG = WIFIConnectionManager.class.getName(); private static WIFIConnectionManager sInstance = null; private android.net.wifi.WifiManager mWifiManager; private int networkId; public WIFIConnectionManager(Context context) { mWifiManager = (android.net.wifi.WifiManager) context.getApplicationContext().getSystemService(Context.WIFI_SERVICE); } public static WIFIConnectionManager getInstance(Context context) { if (sInstance == null) { synchronized (WIFIConnectionManager.class) { if (sInstance == null) { sInstance = new WIFIConnectionManager(context); } } } return sInstance; } /** * 尝试连接指定wifi * * @param ssid wifi名 * @param password 密码 * @return 是否连接成功 */ public boolean connect(@NonNull String ssid, @NonNull String password) { Log.d(TAG, "connect() called with: ssid = [" + ssid + "], password = [" + password + "]"); Log.d(TAG, "connect: wifi opened = " + openWifi()); boolean isConnected = isConnected(ssid);//当前已连接至指定wifi Log.d(TAG, "connect: is already connected = " + isConnected); if (isConnected) { return true; } networkId = mWifiManager.addNetwork(newWifiConfig(ssid, password, true)); boolean result = mWifiManager.enableNetwork(networkId, true); Log.d(TAG, "connect: network enabled = " + result); return result; } /** * 根据wifi名与密码配置 WiFiConfiguration, 每次尝试都会先断开已有连接 * * @param isClient 当前设备是作为客户端,还是作为服务端, 影响SSID和PWD */ @NonNull private WifiConfiguration newWifiConfig(String ssid, String password, boolean isClient) { WifiConfiguration config = new WifiConfiguration(); config.allowedAuthAlgorithms.clear(); config.allowedGroupCiphers.clear(); config.allowedKeyManagement.clear(); config.allowedPairwiseCiphers.clear(); config.allowedProtocols.clear(); if (isClient) {//作为客户端, 连接服务端wifi热点时要加双引号 config.SSID = "\"" + ssid + "\""; config.preSharedKey = "\"" + password + "\""; } else {//作为服务端, 开放wifi热点时不需要加双引号 config.SSID = ssid; config.preSharedKey = password; } config.hiddenSSID = true; config.allowedAuthAlgorithms.set(WifiConfiguration.AuthAlgorithm.OPEN); config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.TKIP); config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_PSK); config.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.TKIP); config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP); config.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.CCMP); config.status = WifiConfiguration.Status.ENABLED; return config; } /** * @return 热点是否已开启 */ public boolean isWifiEnabled() { try { Method methodIsWifiApEnabled = WifiManager.class.getDeclaredMethod("isWifiApEnabled"); return (boolean) methodIsWifiApEnabled.invoke(mWifiManager); } catch (Exception e) { Log.e(TAG, "isWifiEnabled: ", e); return false; } } /** * 是否已连接指定wifi */ public boolean isConnected(String ssid) { WifiInfo wifiInfo = mWifiManager.getConnectionInfo(); if (wifiInfo == null) { return false; } switch (wifiInfo.getSupplicantState()) { case AUTHENTICATING: case ASSOCIATING: case ASSOCIATED: case FOUR_WAY_HANDSHAKE: case GROUP_HANDSHAKE: case COMPLETED: return wifiInfo.getSSID().replace("\"", "").equals(ssid); default: return false; } } /** * 打开WiFi * @return */ public boolean openWifi() { boolean opened = true; if (!mWifiManager.isWifiEnabled()) { opened = mWifiManager.setWifiEnabled(true); } return opened; } /** * 关闭wifi * @return */ public boolean closeWifi() { boolean closed = true; if (mWifiManager.isWifiEnabled()) { closed = mWifiManager.setWifiEnabled(false); } return closed; } /** * 断开连接 * @return */ public WIFIConnectionManager disconnect() { if (networkId != 0) { mWifiManager.disableNetwork(networkId); } mWifiManager.disconnect(); return this; } /** * 是否连接过指定Wifi */ @Nullable public WifiConfiguration everConnected(String ssid) { List existingConfigs = mWifiManager.getConfiguredNetworks(); if (existingConfigs == null || existingConfigs.isEmpty()) { return null; } ssid = "\"" + ssid + "\""; for (WifiConfiguration existingConfig : existingConfigs) { if (existingConfig.SSID.equals(ssid)) { return existingConfig; } } return null; } /** * 获取本机的ip地址 */ @Nullable public String getLocalIp() { return convertIp(mWifiManager.getConnectionInfo().getIpAddress()); } private String convertIp(int ipAddress) { if (ipAddress == 0) return null; return ((ipAddress & 0xff) + "." + (ipAddress >> 8 & 0xff) + "." + (ipAddress >> 16 & 0xff) + "." + (ipAddress >> 24 & 0xff)); } public WifiManager getWifiManager() { return mWifiManager; } }2.该设备必须在不断的进行扫描wifi的信息，与自己内置的WiFi是否SSID和密码一致。 public class WIFIAutoConnectionService extends Service { public static final String SSID = "HUAWEI"; public static final String PWD = "nihao321"; private static final String TAG = WIFIAutoConnectionService.class.getSimpleName(); private static final String KEY_SSID = "KEY_SSID"; private static final String KEY_PWD = "KEY_PWD"; /** * wifi名 */ private String mSsid = ""; /** * 密码 */ private String mPwd = ""; /** * 负责不断尝试连接指定wifi */ private Handler mHandler = new Handler(Looper.getMainLooper(), new Handler.Callback() { @Override public boolean handleMessage(Message msg) { WIFIConnectionManager.getInstance(WIFIAutoConnectionService.this).connect(mSsid, mPwd); boolean connected = WIFIConnectionManager.getInstance(WIFIAutoConnectionService.this).isConnected(mSsid); Log.d(TAG, "handleMessage: wifi connected = " + connected); if (!connected) { Log.d(TAG, "handleMessage: re-try in 5 seconds"); mHandler.sendEmptyMessageDelayed(0, 5000);//5s循环 } return true; } }); /** * 连接指定wifi热点, 失败后5s循环 * * @param context 用于启动服务的上下文 * @param ssid 默认HUD-WIFI * @param pwd (WPA加密)默认12345678 */ public static void start(Context context, String ssid, String pwd) { Intent starter = new Intent(context,WIFIAutoConnectionService.class); starter.putExtra(KEY_SSID, ssid).putExtra(KEY_PWD, pwd); context.startService(starter); Log.d(TAG, "start: "); } @Override public void onCreate() { super.onCreate(); } /** * @return always null */ @Nullable @Override public IBinder onBind(Intent intent) { return null; } @Override public int onStartCommand(Intent intent, int flags, int startId) { mSsid = intent.getStringExtra(KEY_SSID); mPwd = intent.getStringExtra(KEY_PWD); mHandler.sendEmptyMessage(0); return START_NOT_STICKY; } @Override public void onDestroy() { super.onDestroy(); Log.d(TAG, "onDestroy: "); }3.创建一个BroadcastReceiver来判断wifi的连接及扫描获取的结果： public class WIFIStateReceiver extends BroadcastReceiver { private static final String TAG = WIFIStateReceiver.class.getName(); private Context mContext; List scanResults; public WIFIStateReceiver(Context context) { this.mContext = context; } @Override public void onReceive(Context context, Intent intent) { if (!intent.getAction().equals(WifiManager.NETWORK_STATE_CHANGED_ACTION)) { return; } scanResults = WIFIConnectionManager.getInstance(mContext).getWifiManager().getScanResults(); for (int i = 0 ; i < scanResults.size();i++) { Log.e(TAG,"scanResults:----"+(scanResults.get(i)).SSID); } if (!WIFIConnectionManager.getInstance(mContext).isConnected("HUAWEI")) { WIFIConnectionManager.getInstance(mContext).connect("HUAWEI", "nihao321"); } } }4.主界面的简单逻辑： public class MainActivity extends AppCompatActivity implements View.OnClickListener{ private static final String TAG = MainActivity.class.getName(); private EditText mEtAccount; private EditText mEtPwd; private WIFIStateReceiver mWIFIStateReceiver; private Button mBtnAuto; private Button mBtnDisconnect; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initView(); initData(); initEvent(); } private void initEvent() { mBtnAuto.setOnClickListener(this); mBtnDisconnect.setOnClickListener(this); } private void initData() { } private void initView() { mEtAccount = findViewById(R.id.et_account); mEtPwd = findViewById(R.id.et_pwd); mBtnAuto = findViewById(R.id.btn_auto); mBtnDisconnect = findViewById(R.id.btn_disconnect); } @Override protected void onDestroy() { super.onDestroy(); unregisterReceiver(mWIFIStateReceiver); } @Override public void onClick(View v) { switch (v.getId()) { case R.id.btn_auto: { if (mWIFIStateReceiver == null) { mWIFIStateReceiver = new WIFIStateReceiver(MainActivity.this); registerReceiver(mWIFIStateReceiver, new IntentFilter(WifiManager.NETWORK_STATE_CHANGED_ACTION)); WIFIAutoConnectionService.start(this,mEtAccount.getText().toString().trim(),mEtPwd.getText().toString().trim()); } } break; case R.id.btn_disconnect: { WIFIConnectionManager.getInstance(this).disconnect(); WIFIConnectionManager.getInstance(this).closeWifi(); } break; } } } 三、简单小demo的地址 |
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