WIFI状态监听

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ConnectionDetector.java

public class ConnectionDetector {    private Context mContext;    public ConnectionDetector(Context context) {        mContext = context;    }    public boolean isConnectingToInternet() {        ConnectivityManager connectivity = (ConnectivityManager) mContext.getSystemService(Context.CONNECTIVITY_SERVICE);        if (connectivity != null) {            NetworkInfo[] info = connectivity.getAllNetworkInfo();            if (info != null)                for (int i = 0; i < info.length; i++)                    if (info[i].getState() == NetworkInfo.State.CONNECTED) {                        return true;                    }        }        return false;    }}

ConnectionChangeReceiver.java

public class ConnectionChangeReceiver extends BroadcastReceiver {    private final String TAG = ConnectionChangeReceiver.class.getSimpleName();    private static int lastType = -1;//1 网络断开，-1 网络连接     private boolean mFirstReg = true;//首次注册时候会触发一次，所以做多了个首次注册的判断    @Override    public void onReceive(Context context, Intent intent) {        String action = intent.getAction();        // 检查连接状态        ConnectionDetector cd = new ConnectionDetector(context);        Boolean isInternetPresent = cd.isConnectingToInternet();        if (!isInternetPresent) {            if (lastType != -1) {                Toast.makeText(context, "网络连接中断", Toast.LENGTH_LONG).show();                Log.i(TAG, "网络连接中断");            }            lastType = -1;        } else {            if (lastType != 1 && !mFirstReg) {                Toast.makeText(context, "网络连接上", Toast.LENGTH_LONG).show();                Log.i(TAG, "网络连接上");            }            lastType = 1;        }        mFirstReg = false;    }}

使用方法：

public class MainActivity extends Activity {    private ConnectionChangeReceiver mNetworkStateReceiver;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mNetworkStateReceiver = new ConnectionChangeReceiver();        IntentFilter filter = new IntentFilter();          filter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);         registerReceiver(mNetworkStateReceiver, filter);     }    @Override    protected void onDestroy() {        // TODO Auto-generated method stub        super.onDestroy();        unregisterReceiver(mNetworkStateReceiver);    }}

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