use thread pool executors for async image loading and cropping operations to prevent app hang if default executor is busy (thx @ruifcardoso)

Author: ArthurHub

README.md

@@ -123,6 +123,7 @@ For more information, see the [GitHub Wiki](https://github.com/ArthurHub/Android
 ## Change log
 *2.5.1* (in-dev)
 - Try solve manifest merger issue by adding `transitive` flag #405 (thx @j-garin)
+- Use thread pool executors for async image loading and cropping operations to prevent app hang if default executor is busy (thx @ruifcardoso)
 
 *2.5.0*
 - Update to sdk v26

cropper/src/main/java/com/theartofdev/edmodo/cropper/CropImageView.java

@@ -22,6 +22,7 @@
 import android.graphics.Rect;
 import android.graphics.RectF;
 import android.net.Uri;
+import android.os.AsyncTask;
 import android.os.Bundle;
 import android.os.Parcelable;
 import android.support.media.ExifInterface;
@@ -1020,7 +1021,7 @@ public void setImageUriAsync(Uri uri) {
       mRestoreDegreesRotated = 0;
       mCropOverlayView.setInitialCropWindowRect(null);
       mBitmapLoadingWorkerTask = new WeakReference<>(new BitmapLoadingWorkerTask(this, uri));
-      mBitmapLoadingWorkerTask.get().execute();
+      mBitmapLoadingWorkerTask.get().executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
       setProgressBarVisibility();
     }
   }
@@ -1318,7 +1319,7 @@ public void startCropWorkerTask(
                     saveCompressFormat,
                     saveCompressQuality));
       }
-      mBitmapCroppingWorkerTask.get().execute();
+      mBitmapCroppingWorkerTask.get().executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
       setProgressBarVisibility();
     }
   }