Downloading images from threads works. They aren't laid out correctly...

InClass3/AndroidManifest.xml

@@ -7,6 +7,7 @@
     <uses-sdk
         android:minSdkVersion="11"
         android:targetSdkVersion="18" />
+    <uses-permission android:name="android.permission.INTERNET"/>
 
     <application
         android:allowBackup="true"

InClass3/src/edu/uncc/itcs4180/hw4/PhotoThread.java

@@ -1,15 +1,54 @@
 package edu.uncc.itcs4180.hw4;
 
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.net.HttpURLConnection;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ThreadPoolExecutor;
+
+import org.apache.http.HttpConnection;
+
 import android.os.Bundle;
+import android.os.Handler;
+import android.os.Message;
 import android.app.Activity;
+import android.app.ProgressDialog;
+import android.content.Context;
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+import android.util.Log;
 import android.view.Menu;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.ImageView;
 
 public class PhotoThread extends Activity {
 	
+	ProgressDialog dialog;
+	public int[] imageUrlIds = {R.string.uncc_main_image, R.string.football_main_image,
+			R.string.ifest_main_image, R.string.commencement_main_image
+	};
+	private final int MSG_WHAT_ERROR = -1;
+
 	@Override
 	protected void onCreate(Bundle savedInstanceState) {
 		super.onCreate(savedInstanceState);
 		setContentView(R.layout.activity_photo_thread);
+		
+		// Set the initial progress dialog
+		dialog = new ProgressDialog(this);
+		dialog.setMessage("Downloading images...");
+		dialog.setCancelable(false);
+		dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
+		dialog.show();
+		
+		// Asynchronous, we're done after starting the downloads
+		Handler handler = new Handler(new PhotoThreadHandler(this));
+		downloadImages(handler);
 	}
 
 	@Override
@@ -19,4 +58,92 @@ public class PhotoThread extends Activity {
 		return true;
 	}
 	
+	public void downloadImages(Handler handler) {
+		int progressIncrement = dialog.getMax() / imageUrlIds.length;
+		
+		// Start up the thread pool, and get downloading!
+		ExecutorService pool = Executors.newFixedThreadPool(2);
+		pool.execute(new DownloadThread(getString(R.string.uncc_main_image), handler));
+		pool.execute(new DownloadThread(getString(R.string.football_main_image), handler));
+		pool.execute(new DownloadThread(getString(R.string.ifest_main_image), handler));
+		pool.execute(new DownloadThread(getString(R.string.commencement_main_image), handler));
+	}
+	
+	private class DownloadThread implements Runnable{
+		String url;
+		Handler handler;
+		
+		public DownloadThread(String url, Handler handler) {
+			this.url = url;
+			this.handler = handler;
+		}
+
+		@Override
+		public void run() {
+			// Download the image at the given URL
+			// If we ever encounter an issue, send an empty message
+			try {
+				// Connect to get our image
+				URL url = new URL(this.url);
+				HttpURLConnection con = (HttpURLConnection) url.openConnection();
+				con.connect();
+				int statusCode = con.getResponseCode();
+				if (statusCode == HttpURLConnection.HTTP_OK) {
+					// Download the image, and send it in a message to the handler
+					Bitmap image = BitmapFactory.decodeStream(con.getInputStream());
+					Message msg = Message.obtain(handler);
+					msg.obj = image;
+					handler.sendMessage(msg);
+				} else {
+					handler.sendEmptyMessage(MSG_WHAT_ERROR);
+				}
+			} catch (MalformedURLException e) {
+				handler.sendEmptyMessage(MSG_WHAT_ERROR);
+				e.printStackTrace();
+			} catch (IOException e) {
+				// Issue in the HTTP connection, not too much we can do here...
+				handler.sendEmptyMessage(MSG_WHAT_ERROR);
+				e.printStackTrace();
+			}
+		}
+		
+	}
+	
+	private class PhotoThreadHandler implements Handler.Callback {
+		Context ctx;
+		
+		public PhotoThreadHandler(Context ctx) {
+			this.ctx = ctx;
+		}
+
+		@Override
+		public boolean handleMessage(Message msg) {
+			// We are sent a message every time a download completes,
+			// so update the progress, and close the dialog if we're done.
+			int progressIncrement = dialog.getMax() / imageUrlIds.length;
+			
+			// The message actually contains a Bitmap that we need to put in the UI, so do that
+			if (msg.what == MSG_WHAT_ERROR) {
+				dialog.dismiss();
+				Log.e("HANDLER", "Got a MSG_WHAT_ERROR, not sure what's up...");
+				finish();
+			} else {
+				// The thread worked just fine, so let's get the Bitmap out and create a view for it
+				Bitmap image = (Bitmap) msg.obj;
+				ImageView newImage = new ImageView(this.ctx);
+				newImage.setImageBitmap(image);
+				((ViewGroup)findViewById(android.R.id.content)).addView(newImage);
+			}
+			
+			// If (max - increment == current progress) we're done
+			if (dialog.getMax() - progressIncrement == dialog.getProgress())
+				dialog.dismiss();
+			else
+				dialog.setProgress(dialog.getProgress() + progressIncrement);
+			
+			return true;
+		}
+		
+	}
+
 }