Fixes ui freeze while image is downloaded

mobile/com.sap.sailing.android.tracking.app/src/com/sap/sailing/android/tracking/app/ui/activities/RegattaActivity.java

@@ -11,10 +11,7 @@ import android.os.Bundle;
 import android.os.Environment;
 import android.support.v7.widget.Toolbar;
 import android.util.Log;
-import android.view.Menu;
-import android.view.MenuInflater;
-import android.view.MenuItem;
-import android.view.View;
+import android.view.*;
 import android.widget.ImageView;
 import android.widget.LinearLayout;
 import android.widget.TextView;
@@ -36,6 +33,7 @@ import com.sap.sailing.android.tracking.app.BuildConfig;
 import com.sap.sailing.android.tracking.app.R;
 import com.sap.sailing.android.tracking.app.ui.fragments.RegattaFragment;
 import com.sap.sailing.android.tracking.app.utils.AppPreferences;
+import com.sap.sailing.android.tracking.app.utils.BitmapHelper;
 import com.sap.sailing.android.tracking.app.utils.CheckinManager;
 import com.sap.sailing.android.tracking.app.utils.DatabaseHelper;
 import com.sap.sailing.android.tracking.app.valueobjects.CheckinData;
@@ -327,7 +325,6 @@ public class RegattaActivity extends AbstractRegattaActivity implements RegattaF
         if (pictureFile == null || !pictureFile.exists()) {
             return null;
         }
-
         BitmapFactory.Options options = new BitmapFactory.Options();
         options.inPreferredConfig = Bitmap.Config.ARGB_8888;
         Bitmap image = BitmapFactory.decodeFile(pictureFile.getAbsolutePath(), options);
@@ -478,7 +475,7 @@ public class RegattaActivity extends AbstractRegattaActivity implements RegattaF
         }
     }
 
-    private class DownloadLeaderboardImageTask extends AsyncTask<String, Void, Bitmap> {
+    private class DownloadLeaderboardImageTask extends AsyncTask<String, Void, File> {
         ImageView bmImage;
         String downloadUrl;
         ProgressDialog dialog;
@@ -491,27 +488,39 @@ public class RegattaActivity extends AbstractRegattaActivity implements RegattaF
         protected void onPreExecute() {
             super.onPreExecute();
             dialog = new ProgressDialog(bmImage.getContext(), R.style.Base_Theme_AppCompat_Dialog);
+            dialog.setCancelable(false);
             dialog.setMessage(getString(R.string.download_team_image_message));
             dialog.show();
         }
 
-        protected Bitmap doInBackground(String... urls) {
+        protected File doInBackground(String... urls) {
             downloadUrl = urls[0];
-            Bitmap mIcon11 = null;
+            File imageFile = null;
 
             try {
                 InputStream in = new java.net.URL(downloadUrl).openStream();
-                mIcon11 = BitmapFactory.decodeStream(in);
+                imageFile = getImageFile(getLeaderboardImageFileName(leaderboard.name));
+                if (!imageFile.exists()){
+                    imageFile.createNewFile();
+                }
+                FileOutputStream outputStream = new FileOutputStream(imageFile);
+                int read = 0;
+                byte[] bytes = new byte[1024];
+
+                while ((read = in.read(bytes)) != -1) {
+                    outputStream.write(bytes, 0, read);
+                }
+                outputStream.close();
+                in.close();
             } catch (Exception e) {
                 e.printStackTrace();
             }
-            return mIcon11;
+            return imageFile;
         }
 
-        protected void onPostExecute(Bitmap result) {
-            if (result != null) {
-                bmImage.setImageBitmap(result);
-                storeImageAndSendToServer(result, getLeaderboardImageFileName(leaderboard.name), false);
+        protected void onPostExecute(File result) {
+            if (result != null && result.exists()) {
+                bmImage.setImageBitmap(BitmapHelper.getBitmapFromFile(result, bmImage.getMeasuredWidth(), bmImage.getMeasuredHeight()));
                 userImageUpdated();
             } else {
                 ExLog.e(RegattaActivity.this, TAG, "Failed to download leaderboard image at url " + downloadUrl);

mobile/com.sap.sailing.android.tracking.app/src/com/sap/sailing/android/tracking/app/utils/BitmapHelper.java

@@ -0,0 +1,46 @@
+package com.sap.sailing.android.tracking.app.utils;
+
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+
+import java.io.File;
+
+public class BitmapHelper {
+    public static Bitmap getBitmapFromFile(File file, int requiredWidth, int requiredHeight){
+        // First decode with inJustDecodeBounds=true to check dimensions
+        final BitmapFactory.Options options = new BitmapFactory.Options();
+        options.inJustDecodeBounds = true;
+        BitmapFactory.decodeFile(file.getPath(), options);
+
+        // Calculate inSampleSize
+        options.inSampleSize = calculateInSampleSize(options, requiredWidth, requiredHeight);
+
+        // Decode bitmap with inSampleSize set
+        options.inJustDecodeBounds = false;
+        return BitmapFactory.decodeFile(file.getPath(), options);
+    }
+
+    // Source: http://developer.android.com/training/displaying-bitmaps/load-bitmap.html
+    private static int calculateInSampleSize(
+        BitmapFactory.Options options, int reqWidth, int reqHeight) {
+        // Raw height and width of image
+        final int height = options.outHeight;
+        final int width = options.outWidth;
+        int inSampleSize = 1;
+
+        if (height > reqHeight || width > reqWidth) {
+
+            final int halfHeight = height / 2;
+            final int halfWidth = width / 2;
+
+            // Calculate the largest inSampleSize value that is a power of 2 and keeps both
+            // height and width larger than the requested height and width.
+            while ((halfHeight / inSampleSize) > reqHeight
+                && (halfWidth / inSampleSize) > reqWidth) {
+                inSampleSize *= 2;
+            }
+        }
+        return inSampleSize;
+    }
+
+}