Add VideoSearchTask

src/com/annimon/donetskwebcam/VideoSearchTask.java

@@ -0,0 +1,62 @@
+package com.annimon.donetskwebcam;
+
+import java.io.IOException;
+import java.net.HttpURLConnection;
+import java.net.URL;
+import java.util.ArrayList;
+import java.util.List;
+import android.os.AsyncTask;
+import android.widget.ArrayAdapter;
+
+public final class VideoSearchTask extends AsyncTask<Long, Void, List<String>> {
+
+    private final ArrayAdapter<String> urlsAdapter;
+    
+    public VideoSearchTask(ArrayAdapter<String> urlsAdapter) {
+        this.urlsAdapter = urlsAdapter;
+    }
+
+    @Override
+	protected List<String> doInBackground(Long... params) {
+        long startTime = params[0];
+        long period = params[1];
+        String vs = "vs" + params[2];
+        long camera = params[3];
+        
+        List<String> list = new ArrayList<>();
+        
+        for (int i = 0; i < period; i++) {
+            String url = "http://" + vs + ".videoprobki.com.ua/streams/cam" +
+                    camera + "stream_" + (startTime + i) + ".mp4";
+            if (isHttpOk(url)) {
+                list.add(url);
+                i += 50;
+            }
+        }
+		return list;
+	}
+    
+    
+
+    @Override
+    protected void onPostExecute(List<String> result) {
+        super.onPostExecute(result);
+        if (result != null) {
+            for (String url : result) {
+                urlsAdapter.add(url);
+            }
+        }
+    }
+
+    private static boolean isHttpOk(String siteUrl) {
+        try {
+            URL url = new URL(siteUrl);
+            HttpURLConnection conn = (HttpURLConnection)url.openConnection();
+
+            int code = conn.getResponseCode();
+            return (code == HttpURLConnection.HTTP_OK);
+        } catch (IOException ioe) {
+            return false;
+        }
+    }
+}