start to implement sticky header behavior

Signed-off-by: alex <alex.plutta@googlemail.com>
Signed-off-by: Andy Scherzinger <info@andy-scherzinger.de>

src/main/java/com/owncloud/android/ui/activities/ActivitiesActivity.java

@@ -60,7 +60,7 @@ import butterknife.BindView;
 import butterknife.ButterKnife;
 import butterknife.Unbinder;
 
-public class ActivitiesActivity extends FileActivity implements ActivityListInterface, ActivitiesContract.View {
+public class ActivitiesActivity extends FileActivity implements ActivityListInterface, ActivityListElement, ActivitiesContract.View {
     private static final String TAG = ActivitiesActivity.class.getSimpleName();
 
     @BindView(R.id.empty_list_view)
@@ -104,9 +104,9 @@ public class ActivitiesActivity extends FileActivity implements ActivityListInte
     protected void onCreate(Bundle savedInstanceState) {
         Log_OC.v(TAG, "onCreate() start");
         super.onCreate(savedInstanceState);
-
         mActionListener = new ActivitiesPresenter(activitiesRepository, filesRepository, this);
 
+        setContentView(R.layout.activity_list_layout);
         setContentView(R.layout.activity_list_layout);
         unbinder = ButterKnife.bind(this);
 
@@ -165,7 +165,7 @@ public class ActivitiesActivity extends FileActivity implements ActivityListInte
     private void setupContent() {
         emptyContentIcon.setImageResource(R.drawable.ic_activity_light_grey);
         emptyContentProgressBar.getIndeterminateDrawable().setColorFilter(ThemeUtils.primaryAccentColor(this),
-                PorterDuff.Mode.SRC_IN);
+                                                                          PorterDuff.Mode.SRC_IN);
 
         FileDataStorageManager storageManager = new FileDataStorageManager(getAccount(), getContentResolver());
         adapter = new ActivityListAdapter(this, getUserAccountManager(), this, storageManager, getCapabilities(), false);
@@ -174,6 +174,7 @@ public class ActivitiesActivity extends FileActivity implements ActivityListInte
         LinearLayoutManager layoutManager = new LinearLayoutManager(this);
 
         recyclerView.setLayoutManager(layoutManager);
+        recyclerView.addItemDecoration(new ActivityListItemDecoration());
         recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
 
             @Override
@@ -186,7 +187,7 @@ public class ActivitiesActivity extends FileActivity implements ActivityListInte
 
                 // synchronize loading state when item count changes
                 if (!isLoadingActivities && (totalItemCount - visibleItemCount) <= (firstVisibleItemIndex + 5)
-                        && nextPageUrl != null && !nextPageUrl.isEmpty()) {
+                    && nextPageUrl != null && !nextPageUrl.isEmpty()) {
                     // Almost reached the end, continue to load new activities
                     mActionListener.loadActivities(nextPageUrl);
                 }

src/main/java/com/owncloud/android/ui/activities/ActivityListElement.java

@@ -0,0 +1,4 @@
+package com.owncloud.android.ui.activities;
+
+public interface ActivityListElement {
+}

src/main/java/com/owncloud/android/ui/activities/ActivityListHeader.java

@@ -0,0 +1,14 @@
+package com.owncloud.android.ui.activities;
+
+public class ActivityListHeader implements ActivityListElement {
+    final private String headline;
+
+    public ActivityListHeader(String headline) {
+        this.headline = headline;
+    }
+
+    public String getHeadline() {
+        return headline;
+    }
+
+}

src/main/java/com/owncloud/android/ui/activities/ActivityListItemDecoration.java

@@ -0,0 +1,34 @@
+package com.owncloud.android.ui.activities;
+
+import android.content.Context;
+import android.graphics.Canvas;
+import android.util.Log;
+import android.view.View;
+
+import androidx.annotation.NonNull;
+import androidx.recyclerview.widget.RecyclerView;
+
+public class ActivityListItemDecoration extends RecyclerView.ItemDecoration {
+    private final String TAG = this.getClass().getSimpleName();
+    @Override
+    public void onDrawOver(@NonNull Canvas c, @NonNull RecyclerView parent, @NonNull RecyclerView.State state) {
+        super.onDrawOver(c, parent, state);
+
+        View topChild = parent.getChildAt(0);
+        View currentHeader = topChild;
+
+
+
+        if (currentHeader != null) {
+            drawHeader(c, currentHeader);
+            Log.d(TAG,"Attach new Header" );
+        }
+    }
+
+    private void drawHeader(Canvas c, View header) {
+        c.save();
+        c.translate(0, 0);
+        header.draw(c);
+        c.restore();
+    }
+}

src/main/java/com/owncloud/android/ui/adapter/ActivityListAdapter.java

@@ -65,6 +65,7 @@ import com.owncloud.android.lib.resources.activities.models.PreviewObject;
 import com.owncloud.android.lib.resources.files.FileUtils;
 import com.owncloud.android.lib.resources.status.OCCapability;
 import com.owncloud.android.lib.resources.status.OwnCloudVersion;
+import com.owncloud.android.ui.activities.ActivityListHeader;
 import com.owncloud.android.ui.interfaces.ActivityListInterface;
 import com.owncloud.android.utils.DisplayUtils;
 import com.owncloud.android.utils.MimeTypeUtil;
@@ -141,7 +142,7 @@ public class ActivityListAdapter extends RecyclerView.Adapter<RecyclerView.ViewH
                 values.add(activity);
             } else {
                 sTime = time;
-                values.add(sTime);
+                values.add(new ActivityListHeader(sTime));
                 values.add(activity);
             }
         }
@@ -173,11 +174,11 @@ public class ActivityListAdapter extends RecyclerView.Adapter<RecyclerView.ViewH
             }
 
             if (activity.getRichSubjectElement() != null &&
-                    !TextUtils.isEmpty(activity.getRichSubjectElement().getRichSubject())) {
+                !TextUtils.isEmpty(activity.getRichSubjectElement().getRichSubject())) {
                 activityViewHolder.subject.setVisibility(View.VISIBLE);
                 activityViewHolder.subject.setMovementMethod(LinkMovementMethod.getInstance());
                 activityViewHolder.subject.setText(addClickablePart(activity.getRichSubjectElement()),
-                        TextView.BufferType.SPANNABLE);
+                                                   TextView.BufferType.SPANNABLE);
                 activityViewHolder.subject.setVisibility(View.VISIBLE);
             } else if (!TextUtils.isEmpty(activity.getSubject())) {
                 activityViewHolder.subject.setVisibility(View.VISIBLE);
@@ -198,7 +199,7 @@ public class ActivityListAdapter extends RecyclerView.Adapter<RecyclerView.ViewH
             }
 
             if (activity.getRichSubjectElement() != null &&
-                    activity.getRichSubjectElement().getRichObjectList().size() > 0) {
+                activity.getRichSubjectElement().getRichObjectList().size() > 0) {
 
                 activityViewHolder.list.setVisibility(View.VISIBLE);
                 activityViewHolder.list.removeAllViews();
@@ -237,7 +238,8 @@ public class ActivityListAdapter extends RecyclerView.Adapter<RecyclerView.ViewH
             }
         } else {
             ActivityViewHeaderHolder activityViewHeaderHolder = (ActivityViewHeaderHolder) holder;
-            activityViewHeaderHolder.title.setText((String) values.get(position));
+            ActivityListHeader header = (ActivityListHeader) values.get(position);
+            activityViewHeaderHolder.title.setText((String) header.getHeadline());
         }
     }
 
@@ -325,23 +327,23 @@ public class ActivityListAdapter extends RecyclerView.Adapter<RecyclerView.ViewH
 
     private void downloadIcon(String icon, ImageView itemViewType) {
         GenericRequestBuilder<Uri, InputStream, SVG, PictureDrawable> requestBuilder = Glide.with(context)
-                .using(Glide.buildStreamModelLoader(Uri.class, context), InputStream.class)
-                .from(Uri.class)
-                .as(SVG.class)
-                .transcode(new SvgDrawableTranscoder(), PictureDrawable.class)
-                .sourceEncoder(new StreamEncoder())
-                .cacheDecoder(new FileToStreamDecoder<>(new SvgDecoder()))
-                .decoder(new SvgDecoder())
-                .placeholder(R.drawable.ic_activity)
-                .error(R.drawable.ic_activity)
-                .animate(android.R.anim.fade_in)
-                .listener(new SvgSoftwareLayerSetter<>());
+            .using(Glide.buildStreamModelLoader(Uri.class, context), InputStream.class)
+            .from(Uri.class)
+            .as(SVG.class)
+            .transcode(new SvgDrawableTranscoder(), PictureDrawable.class)
+            .sourceEncoder(new StreamEncoder())
+            .cacheDecoder(new FileToStreamDecoder<>(new SvgDecoder()))
+            .decoder(new SvgDecoder())
+            .placeholder(R.drawable.ic_activity)
+            .error(R.drawable.ic_activity)
+            .animate(android.R.anim.fade_in)
+            .listener(new SvgSoftwareLayerSetter<>());
 
         Uri uri = Uri.parse(icon);
         requestBuilder
-                .diskCacheStrategy(DiskCacheStrategy.SOURCE)
-                .load(uri)
-                .into(itemViewType);
+            .diskCacheStrategy(DiskCacheStrategy.SOURCE)
+            .load(uri)
+            .into(itemViewType);
     }
 
     private SpannableStringBuilder addClickablePart(RichElement richElement) {
@@ -418,7 +420,7 @@ public class ActivityListAdapter extends RecyclerView.Adapter<RecyclerView.ViewH
     CharSequence getHeaderDateString(Context context, long modificationTimestamp) {
         if ((System.currentTimeMillis() - modificationTimestamp) < DateUtils.WEEK_IN_MILLIS) {
             return DisplayUtils.getRelativeDateTimeString(context, modificationTimestamp, DateUtils.DAY_IN_MILLIS,
-                    DateUtils.WEEK_IN_MILLIS, 0);
+                                                          DateUtils.WEEK_IN_MILLIS, 0);
         } else {
             String pattern = "EEEE, MMMM d";
             if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.JELLY_BEAN_MR2) {