Android Open Source - cube-sdk Network Status Manager

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright (C) 2006 The Android Open Source Project
 *//from   w ww  .  j a  v a 2 s  .co m
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package in.srain.cube.util;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.util.Log;

/**
 * A wrapper for a broadcast receiver that provides network connectivity state information, independent of network type (mobile, Wi-Fi, etc.). {@hide}
 */
public class NetworkStatusManager {

    private static final String TAG = "NetworkStatusManager";
    private static final boolean DBG = true;

    private Context mContext;
    private State mState;
    private boolean mListening;
    private String mReason;
    private boolean mIsFailover;

    private NetworkInfo mNetworkInfo;

    private boolean mIsWifi = false;

    private static NetworkStatusManager sInstance;

    public static void init(Context context) {
        sInstance = new NetworkStatusManager();
        sInstance.mIsWifi = checkIsWifi(context);
        sInstance.startListening(context);
    }

    public static NetworkStatusManager getInstance() {
        return sInstance;
    }

    /**
     * In case of a Disconnect, the connectivity manager may have already established, or may be attempting to establish, connectivity with another network. If so, {@code mOtherNetworkInfo} will be non-null.
     */
    private NetworkInfo mOtherNetworkInfo;

    private ConnectivityBroadcastReceiver mReceiver;

    private class ConnectivityBroadcastReceiver extends BroadcastReceiver {
        @SuppressWarnings("deprecation")
        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();

            if (!action.equals(ConnectivityManager.CONNECTIVITY_ACTION) || mListening == false) {
                Log.w(TAG, "onReceived() called with " + mState.toString() + " and " + intent);
                return;
            }

            boolean noConnectivity = intent.getBooleanExtra(ConnectivityManager.EXTRA_NO_CONNECTIVITY, false);

            if (noConnectivity) {
                mState = State.NOT_CONNECTED;
            } else {
                mState = State.CONNECTED;
            }

            mNetworkInfo = (NetworkInfo) intent.getParcelableExtra(ConnectivityManager.EXTRA_NETWORK_INFO);
            mOtherNetworkInfo = (NetworkInfo) intent.getParcelableExtra(ConnectivityManager.EXTRA_OTHER_NETWORK_INFO);

            mReason = intent.getStringExtra(ConnectivityManager.EXTRA_REASON);
            mIsFailover = intent.getBooleanExtra(ConnectivityManager.EXTRA_IS_FAILOVER, false);
            if (DBG) {
                Log.d(TAG, "onReceive(): mNetworkInfo=" + mNetworkInfo + " mOtherNetworkInfo = " + (mOtherNetworkInfo == null ? "[none]" : mOtherNetworkInfo + " noConn=" + noConnectivity)
                        + " mState=" + mState.toString());
            }

            mIsWifi = checkIsWifi(mContext);
        }
    }

    ;

    public static boolean checkIsWifi(Context context) {
        ConnectivityManager connectivity = (ConnectivityManager) (context.getSystemService(Context.CONNECTIVITY_SERVICE));
        if (connectivity != null) {
            NetworkInfo networkInfo = connectivity.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
            if (networkInfo != null && networkInfo.isConnectedOrConnecting()) {
                return true;
            }
        }
        return false;
    }

    public enum State {
        UNKNOWN,

        /**
         * This state is returned if there is connectivity to any network *
         */
        CONNECTED,
        /**
         * This state is returned if there is no connectivity to any network. This is set to true under two circumstances:
         * <ul>
         * <li>When connectivity is lost to one network, and there is no other available network to attempt to switch to.</li>
         * <li>When connectivity is lost to one network, and the attempt to switch to another network fails.</li>
         */
        NOT_CONNECTED
    }

    private NetworkStatusManager() {
        mState = State.UNKNOWN;
        mReceiver = new ConnectivityBroadcastReceiver();
    }

    /**
     * This method starts listening for network connectivity state changes.
     *
     * @param context
     */
    public synchronized void startListening(Context context) {
        if (!mListening) {
            mContext = context;

            IntentFilter filter = new IntentFilter();
            filter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);
            context.registerReceiver(mReceiver, filter);
            mListening = true;
        }
    }

    /**
     * This method stops this class from listening for network changes.
     */
    public synchronized void stopListening() {
        if (mListening) {
            mContext.unregisterReceiver(mReceiver);
            mContext = null;
            mNetworkInfo = null;
            mOtherNetworkInfo = null;
            mIsFailover = false;
            mReason = null;
            mListening = false;
        }
    }

    /**
     * Return the NetworkInfo associated with the most recent connectivity event.
     *
     * @return {@code NetworkInfo} for the network that had the most recent connectivity event.
     */
    public NetworkInfo getNetworkInfo() {
        return mNetworkInfo;
    }

    /**
     * If the most recent connectivity event was a DISCONNECT, return any information supplied in the broadcast about an alternate network that might be available. If this returns a non-null value, then another broadcast should follow shortly indicating whether connection to the other network succeeded.
     *
     * @return NetworkInfo
     */
    public NetworkInfo getOtherNetworkInfo() {
        return mOtherNetworkInfo;
    }

    /**
     * Returns true if the most recent event was for an attempt to switch over to a new network following loss of connectivity on another network.
     *
     * @return {@code true} if this was a fail over attempt, {@code false} otherwise.
     */
    public boolean isFailover() {
        return mIsFailover;
    }

    /**
     * An optional reason for the connectivity state change may have been supplied. This returns it.
     *
     * @return the reason for the state change, if available, or {@code null} otherwise.
     */
    public String getReason() {
        return mReason;
    }

    public boolean isWifi() {
        return mIsWifi;
    }
}

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