ImageLoadTask is working

app/src/main/java/org/communiquons/android/comunic/client/data/ImageLoadTask.java

@@ -1,13 +1,19 @@
 package org.communiquons.android.comunic.client.data;
 
 import android.content.Context;
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+import android.graphics.drawable.BitmapDrawable;
 import android.os.AsyncTask;
 import android.support.v4.content.ContextCompat;
 import android.util.Log;
 import android.widget.ImageView;
 
 import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
+import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
 import java.net.HttpURLConnection;
@@ -48,6 +54,11 @@ public class ImageLoadTask extends AsyncTask<Void, Void, Void> {
      */
     private File img_file = null;
 
+    /**
+     * Bitmap object
+     */
+    private Bitmap bitmap = null;
+
     /**
      * Class constructor
      *
@@ -66,11 +77,11 @@ public class ImageLoadTask extends AsyncTask<Void, Void, Void> {
      * Background task
      */
     @Override
-    protected Void doInBackground(Void... param){
+    protected Void doInBackground(Void... param) {
 
         //Determine the file name for the view
         String filename = get_file_name(url);
-        if(filename == null){
+        if (filename == null) {
             Log.e("ImageLoadTask", "Couldn't generate file storage name !");
             return null; //An error occured
         }
@@ -79,14 +90,65 @@ public class ImageLoadTask extends AsyncTask<Void, Void, Void> {
         //Try to open the file
         img_file = new File(mContext.getCacheDir(), full_filename);
 
+        //Check if file exists or not
+        if (!img_file.exists())
+            //Download it
+            download_image();
 
-        //Check for errors
-        if(img_file == null){
-            Log.e("ImageLoadTask", "Couldn't open image file !");
+        //Check if there is still no file
+        if(!img_file.exists())
             return null;
+
+        //Try to read file
+        try {
+            FileInputStream is = new FileInputStream(img_file);
+            bitmap = BitmapFactory.decodeStream(is);
+            is.close();
+        } catch (FileNotFoundException e){
+            e.printStackTrace();
+        } catch (IOException e){
+            e.printStackTrace();
         }
 
+        //Check for errors
+        if(bitmap == null){
+
+            //Delete cached file
+            img_file.delete();
+
+            Log.e("ImageLoadTask", "File is corrupted, will have to be downloaded again !");
+        }
+
+        return null;
+    }
+
+    /**
+     * On post execution operations
+     */
+    @Override
+    protected void onPostExecute(Void aVoid) {
+        if(bitmap != null)
+            view.setImageBitmap(bitmap);
+    }
+
+    /**
+     * Download the file and store it in the cache
+     *
+     * @return True in case of success
+     */
+    private boolean download_image(){
+
+        //Create cache parent directory
+        if(!create_parent_directory())
+            return false;
+
         try {
+
+            //Open the file for writing
+            if(!img_file.createNewFile())
+                return false;
+            OutputStream os = new FileOutputStream(img_file, false);
+
             //Open the connection
             URL urlObj = new URL(url);
             HttpURLConnection conn = (HttpURLConnection) urlObj.openConnection();
@@ -100,20 +162,19 @@ public class ImageLoadTask extends AsyncTask<Void, Void, Void> {
             //Get input stream
             InputStream is = conn.getInputStream();
 
-            //Open the file for writing
-            OutputStream os = new FileOutputStream(img_file, false);
-
-            //Transfert bytes
+            //Transfer bytes
             Utilities.InputToOutputStream(is, os);
 
             os.close();
             is.close();
+            conn.disconnect();
 
         } catch (Exception e) {
             e.printStackTrace();
+            return false;
         }
 
-        return null;
+        return true;
     }
 
 
@@ -127,4 +188,26 @@ public class ImageLoadTask extends AsyncTask<Void, Void, Void> {
         return Utilities.sha1(url);
     }
 
+    /**
+     * Create cache images files parent directory if it does not exist
+     *
+     * @return True in case of success
+     */
+    private boolean create_parent_directory(){
+        File parent = new File(mContext.getCacheDir(), IMAGE_CACHE_DIRECTORY);
+
+        //Check if parent directory already exists
+        if(parent.exists())
+            return true;
+
+
+        //Try to create directories
+        boolean success = parent.mkdirs();
+
+        //Return error if required
+        if(!success)
+            Log.e("ImageLoadTask", "Couldn't create cache parent directory !");
+
+        return success;
+    }
 }