How can I sort the getScanResults () list based on signal strength in ascending order?

Question

I save scanresult to a list according to the code below:

List<ScanResult> results = wifi.getScanResults(); sb = new StringBuilder(); try { for(int i = 0; i < results.size(); i++){ sb.append(new Integer(i+1).toString() + "."); sb.append("SSID:-").append((results.get(i).SSID).toString()); sb.append("BSSID:-").append((results.get(i).BSSID).toString()); sb.append("Level:-").append((results.get(i).level)); sb.append("Frequency:-").append((results.get(i).frequency)); sb.append("\n\n"); } textStatus.setText(""); textStatus.append("\n\n\n"); textStatus.append(sb); } 

I want to sort this result based on signal level (level), so I am creating a 2D array with data level and Mac. so I wrote code for this:

 String rssi[][]=new String[2][results.size()]; for(int i = 0; i <results.size(); i++){ rssi[0][i] = String.valueOf(results.get(i).level); rssi[1][i]= results.get(i).BSSID; } StringBuilder tmp=new StringBuilder(); Arrays.sort(rssi,new Comparator<String[]>() { @Override public int compare(String[] str1, String[] str2) { final String lv1= str1[0]; final String lv2= str2[0]; return lv1.compareTo(lv2); } ); 

Based on the previous code, I expect rssi[][] in sorted order, but this does not happen ...

Answer 1

try it

  Comparator<ScanResult> comparator = new Comparator<ScanResult>() { @Override public int compare(ScanResult lhs, ScanResult rhs) { return (lhs.level <rhs.level ? -1 : (lhs.level==rhs.level ? 0 : 1)); } } List<ScanResult> results = wifi.getScanResults(); Collections.sort(results, comparator); //Here your list is sorted by level