org.wahtod.wififixer.ui.LocalNetworksLoader.java Source code

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Here is the source code for org.wahtod.wififixer.ui.LocalNetworksLoader.java

Source

/*
 * Wifi Fixer for Android
 *        Copyright (C) 2010-2016  David Van de Ven
 *
 *        This program is free software: you can redistribute it and/or modify
 *        it under the terms of the GNU General Public License as published by
 *        the Free Software Foundation, either version 3 of the License, or
 *        (at your option) any later version.
 *
 *        This program is distributed in the hope that it will be useful,
 *        but WITHOUT ANY WARRANTY; without even the implied warranty of
 *        MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *        GNU General Public License for more details.
 *
 *        You should have received a copy of the GNU General Public License
 *        along with this program.  If not, see http://www.gnu.org/licenses
 */

package org.wahtod.wififixer.ui;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.net.wifi.WifiManager;
import android.support.v4.content.AsyncTaskLoader;
import org.wahtod.wififixer.utility.AsyncWifiManager;
import org.wahtod.wififixer.utility.BroadcastHelper;
import org.wahtod.wififixer.utility.WFScanResult;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

public class LocalNetworksLoader extends AsyncTaskLoader<List<WFScanResult>> {

    private List<WFScanResult> mScanResults;
    private BroadcastReceiver receiver = new BroadcastReceiver() {
        public void onReceive(Context context, Intent intent) {
            /*
             * Receive Scan Results
            */

            if (intent.getAction().equals(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION)) {
                mScanResults = getNetworks(getContext());
            } else if (intent.getExtras().getInt(WifiManager.EXTRA_WIFI_STATE) == WifiManager.WIFI_STATE_DISABLED) {
                mScanResults = new ArrayList<WFScanResult>();

            }
            onContentChanged();
        }
    };

    public LocalNetworksLoader(Context context) {
        super(context);
    }

    @Override
    protected void onStartLoading() {
        registerReceiver();
        if (mScanResults != null) {
            deliverResult(mScanResults);
        }

        if (takeContentChanged() || mScanResults == null) {
            forceLoad();
        }
    }

    @Override
    public void deliverResult(List<WFScanResult> data) {
        if (isReset()) {
            mScanResults = null;
            unregisterReceiver();
            return;
        }

        List<WFScanResult> oldData = mScanResults;
        mScanResults = data;

        if (isStarted()) {
            super.deliverResult(data);
        }

        if (oldData != null && oldData != data) {
            oldData = null;
        }
    }

    /*
     * Returns empty ArrayList<WFScanResult> if wifi off or scan results null
    */
    private List<WFScanResult> getNetworks(Context context) {
        WifiManager wm = AsyncWifiManager.getWifiManager(context);

        if (wm.isWifiEnabled()) {
            List<WFScanResult> scanned = WFScanResult.fromScanResultArray(wm.getScanResults());
            if (scanned != null) {
                Collections.sort(scanned, new SortBySignal());
                return scanned;
            }
        }
        return new ArrayList<WFScanResult>();
    }

    @Override
    public List<WFScanResult> loadInBackground() {
        mScanResults = getNetworks(getContext());
        return mScanResults;
    }

    private void registerReceiver() {
        IntentFilter filter = new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION);
        filter.addAction(WifiManager.WIFI_STATE_CHANGED_ACTION);
        BroadcastHelper.registerReceiver(getContext(), receiver, filter, false);
    }

    @Override
    protected void onReset() {
        onStopLoading();
        mScanResults = null;
        unregisterReceiver();
    }

    @Override
    public void onCanceled(List<WFScanResult> data) {
        super.onCanceled(data);
        mScanResults = null;
    }

    @Override
    protected void onStopLoading() {
        unregisterReceiver();
        cancelLoad();
    }

    private void unregisterReceiver() {
        BroadcastHelper.unregisterReceiver(getContext(), receiver);
    }

    /*
     * Comparator for sorting results by signal level
       */
    class SortBySignal implements Comparator<WFScanResult> {
        public int compare(WFScanResult o2, WFScanResult o1) {
            /*
             * Sort by signal
            */
            return (o1.level < o2.level ? -1 : (o1.level == o2.level ? 0 : 1));
        }
    }
}