I want to update onprogressupdate method, but can't figure out how. My
asynctask calls IpScanCallable class and gets results from it using
ExecutorSerivce and Future interface. however, I don't know how to update
progress. The IpScanCallable interface returns an object of type Node, and
so the onprogressupdate method. but when I call publishprogress(future) it
won't work. anyway how can I update results? and populate the arraylist
thanks
/*
* AscynTask to scan the network
* you should try different timeout for your network/devices
* it will try to detect localhost ip addres and subnet. then
* it will use subnet to scan network
*/
private class TaskScanNetwork extends AsyncTask<Void, Node, Void> {
static final int SCAN_THREADS = 8;
static final int numOfHost = 254;
String subnet = ip.substring(0, ip.lastIndexOf("."));;
int startIp = 1;
int endIp = startIp + SCAN_THREADS;
static final int timeout = 1000;
ExecutorService ipScanExecutor = Executors.newFixedThreadPool(SCAN_THREADS
);
List<Future<Node>> ipList = new ArrayList<>();
@Override
protected void onPreExecute() {
Log.v("Ip Address: ", ip);
hostList.clear();
scanProgress.setMax(numOfHost);
statusMsg.setText("Scanning " + subnet + ".0/24");
}
@Override
protected Void doInBackground(Void... params) {
for (int i = 0; i <= SCAN_THREADS; i++) {
//if canceled terminate AsyncTask
if(isCancelled()) {
break;
}
IpScanCallable ipScanCallable = new IpScanCallable(subnet, startIp, endIp);
Future<Node> futureResults = ipScanExecutor.submit(ipScanCallable);
startIp = endIp + 1;
endIp = startIp + SCAN_THREADS;
ipList.add(futureResults);
}
ipScanExecutor.shutdown();
publishProgress();
return null;
}
@Override
protected void onProgressUpdate(Node... values) {
//only add to ArrayList<Node> if host is alive on network
if(values[0].ip != null) {
hostList.add(values[0]);
networkAdapter.notifyDataSetInvalidated();
Toast.makeText(getApplicationContext(), values[0].getIp(), Toast.
LENGTH_SHORT).show();
}
//update progress bar
scanProgress.setProgress(values[0].progressBar);
}
@Override
protected void onPostExecute(Void aVoid) {
statusMsg.setText(subnet + ".0/24 " + " Hosts");
}
}
IpScanCallable class
package com.example.android.droidscanner;
import android.util.Log;
import java.io.IOException;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.concurrent.Callable;
/**
* Created by jlvaz on 3/28/2017.
*/
public class IpScanCallable implements Callable<Node> {
private Node newNode;
private int timeout = 1000;
private int progress;
private String ip;
private String network;
private int startIp;
private int endIp;
public IpScanCallable(String network, int startIp, int endIp) {
this.network = network;
this.startIp = startIp;
this.endIp = endIp;
}
@Override
public Node call() throws Exception {
for(int i = startIp; i <= endIp; i++) {
ip = network + "." + i;
Log.v("Host: ", ip);
newNode = new Node();
newNode.progressBar = i;
try {
InetAddress inetAddress = InetAddress.getByName(ip);
if (inetAddress.isReachable(timeout)) {
newNode.ip = ip;
}
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
return newNode;
}
}
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