new tile management

mobile/src/com/cradle/iitc_mobile/async/DownloadTile.java

@@ -0,0 +1,69 @@
+package com.cradle.iitc_mobile.async;
+
+import android.app.AlertDialog;
+import android.os.AsyncTask;
+import android.util.Log;
+
+import com.cradle.iitc_mobile.IITC_Mobile;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.net.URLConnection;
+
+/*
+ * this class parses the http response of a web page.
+ * since network operations shouldn't be done on main UI thread
+ * (NetworkOnMainThread exception is thrown) we use an async task for this.
+ */
+public class DownloadTile extends AsyncTask<String, Void, Boolean> {
+
+    private String mFilePath;
+    private String mFileName;
+
+    public DownloadTile(String path, String fileName) {
+        mFilePath = path;
+        mFileName = fileName;
+
+    }
+
+    @Override
+    protected Boolean doInBackground(String... urls) {
+        URL tileUrl = null;
+        URLConnection conn = null;
+        try {
+            tileUrl = new URL(urls[0]);
+            conn = tileUrl.openConnection();
+            InputStream is = null;
+            is = conn.getInputStream();
+            Log.d("iitcm", "writing to path: " + mFilePath);
+            File file = new File(mFilePath, mFileName);
+            File output = writeTileToFile(is, file, mFilePath);
+        } catch (IOException e) {
+            e.printStackTrace();
+            return false;
+        } catch (Exception e) {
+            e.printStackTrace();
+            return false;
+        }
+        return true;
+    }
+
+    private File writeTileToFile(InputStream inStream, File file, String path) throws Exception {
+        File filePath = new File(path);
+        filePath.mkdirs();
+        FileOutputStream outStream = new FileOutputStream(file);
+        int bufferSize = 1024;
+        byte[] buffer = new byte[bufferSize];
+        int len = 0;
+        while ((len = inStream.read(buffer)) != -1) {
+            outStream.write(buffer, 0, len);
+        }
+        if(outStream!=null) outStream.close();
+        return file;
+    }
+
+}