I am using custom listview with baseadapter. Each row contain SimpleDraweeView. I am mapping simpleDraweeView with my local images. If image is not available in local path then i will create a bitmap based on my constraint and store it into that path.
I am doing bitmap creation part in AsyncTask. If i scrolling fast then Asynctask will call multiple times so i want to avoid this by using below function
private boolean cancelPotentialWork(Object data, Object view) {
SimpleDraweeView imageView = (SimpleDraweeView) view;
final BitmapWorkerTask bitmapWorkerTask =getBitmapWorkerTask(imageView);
if (bitmapWorkerTask != null) {
final Object bitmapData = bitmapWorkerTask.mPath;
if (bitmapData == null || !bitmapData.equals(data)) {
bitmapWorkerTask.cancel(true);
} else {
return false;
}
}
return true;
}
Set BitmapworkerTask to SimpleDraweeView Code :
Drawable drawable = new AsyncColorDrawable(task, mPath);
BitmapWorkerTask task = new BitmapWorkerTask(mPath, mImageView, object, optionView, mViewMode, type);
mImageView.setVisibility(View.VISIBLE);
mImageView.setImageDrawable(drawable);
task.execute();
AsyncColorDrawable Class :
private class AsyncColorDrawableForNote extends ColorDrawable {
private final WeakReference<BitmapWorkerTask> bitmapWorkerTaskReference;
private String mPath;
public AsyncColorDrawableForNote(BitmapWorkerTask bitmapWorkerTask, String path) {
super(mContext.getResources().getColor(R.color.application_container_background_color));
bitmapWorkerTaskReference = new WeakReference<>(bitmapWorkerTask);
mPath = path;
}
public BitmapWorkerTask getBitmapWorkerTask() {
return bitmapWorkerTaskReference.get();
}
public String getPath() {
return mPath;
}
}
BitmapWorkerTask :
private class BitmapWorkerTask extends AsyncTask<Void, Void, Bitmap> {
private final WeakReference<SimpleDraweeView> imageViewReference;
private String mPath;
private Object mObject;
private View mOPtionView;
private int mViewMode;
private int mType;
private SimpleDraweeView mDraweeView;
public BitmapWorkerTask(String path, Object view, Object obj,
View optionView, int viewMode, int type) {
mObject = obj;
mPath = path;
mType = type;
mOPtionView = optionView;
mViewMode = viewMode;
mDraweeView = (SimpleDraweeView) view;
imageViewReference = new WeakReference<>((SimpleDraweeView) view);
}
@Override
protected Bitmap doInBackground(Void... params) {
return createBitmapFromNote(mObject, mViewMode, mPath)
}
@Override
protected void onPostExecute(Bitmap value) {
SimpleDraweeView mImageView = getAttachedImageView();
if (value != null && mImageView != null) {
mImageView.setVisibility(View.VISIBLE);
GenericDraweeHierarchy hierarchy = setHierarchyForDraweeView(mImageView, 0);
hierarchy.setFailureImage(new BitmapDrawable(mContext.getResources(), value));
hierarchy.setPlaceholderImage(new BitmapDrawable(mContext.getResources(), value));
mImageView.setImageURI(Uri.fromFile(new File(mPath)));
}
}
private SimpleDraweeView getAttachedImageView() {
final SimpleDraweeView imageView = imageViewReference.get();
final BitmapWorkerTask bitmapWorkerTask = getBitmapWorkerTask(imageView);
if (this == bitmapWorkerTask) {
return imageView;
}
return null;
}
private GenericDraweeHierarchy setHierarchyForDraweeView(SimpleDraweeView draweeView, int duration) {
if (draweeView != null) {
if (draweeView.getHierarchy() == null) {
GenericDraweeHierarchyBuilder builder = new GenericDraweeHierarchyBuilder(mContext.getResources());
GenericDraweeHierarchy hierarchy = builder
.setFadeDuration(duration)
.setPlaceholderImage(new AsyncColorDrawable(mContext.getResources()))
.setFailureImage(mContext.getResources().getDrawable(R.drawable.broken_image_black))
.build();
draweeView.setHierarchy(hierarchy);
} else {
GenericDraweeHierarchy hierarchy = draweeView.getHierarchy();
hierarchy.setFadeDuration(duration);
return hierarchy;
}
}
return null;
}
}
