Lazy mode is available in AccountPostsActivity. Minor bugs fixed.

app/src/main/java/ml/docilealligator/infinityforreddit/AccountPostsActivity.java

@@ -17,6 +17,7 @@ import androidx.appcompat.widget.Toolbar;
 import androidx.fragment.app.Fragment;
 
 import com.google.android.material.appbar.AppBarLayout;
+import com.google.android.material.appbar.CollapsingToolbarLayout;
 
 import javax.inject.Inject;
 
@@ -27,14 +28,17 @@ public class AccountPostsActivity extends AppCompatActivity implements UserThing
 
     static final String EXTRA_USER_WHERE = "EUW";
 
+    private static final String IS_IN_LAZY_MODE_STATE = "IILMS";
     private static final String NULL_ACCESS_TOKEN_STATE = "NATS";
     private static final String ACCESS_TOKEN_STATE = "ATS";
     private static final String ACCOUNT_NAME_STATE = "ANS";
     private static final String FRAGMENT_OUT_STATE = "FOS";
 
+    @BindView(R.id.collapsing_toolbar_layout_account_posts_activity) CollapsingToolbarLayout collapsingToolbarLayout;
     @BindView(R.id.appbar_layout_account_posts_activity) AppBarLayout appBarLayout;
     @BindView(R.id.toolbar_account_posts_activity) Toolbar toolbar;
 
+    private boolean isInLazyMode = false;
     private boolean mNullAccessToken = false;
     private String mAccessToken;
     private String mAccountName;
@@ -42,6 +46,7 @@ public class AccountPostsActivity extends AppCompatActivity implements UserThing
 
     private Fragment mFragment;
     private Menu mMenu;
+    private AppBarLayout.LayoutParams params;
 
     private UserThingSortTypeBottomSheetFragment userThingSortTypeBottomSheetFragment;
 
@@ -117,25 +122,27 @@ public class AccountPostsActivity extends AppCompatActivity implements UserThing
         setSupportActionBar(toolbar);
         getSupportActionBar().setDisplayHomeAsUpEnabled(true);
 
+        params = (AppBarLayout.LayoutParams) collapsingToolbarLayout.getLayoutParams();
+
         if(savedInstanceState != null) {
             mNullAccessToken = savedInstanceState.getBoolean(NULL_ACCESS_TOKEN_STATE);
             mAccessToken = savedInstanceState.getString(ACCESS_TOKEN_STATE);
             mAccountName = savedInstanceState.getString(ACCOUNT_NAME_STATE);
+            isInLazyMode = savedInstanceState.getBoolean(IS_IN_LAZY_MODE_STATE);
             if(!mNullAccessToken && mAccessToken == null) {
-                getCurrentAccountAndBindView();
+                getCurrentAccountAndInitializeFragment();
             } else {
                 mFragment = getSupportFragmentManager().getFragment(savedInstanceState, FRAGMENT_OUT_STATE);
                 getSupportFragmentManager().beginTransaction().replace(R.id.frame_layout_account_posts_activity, mFragment).commit();
-                initializeFragment();
             }
         } else {
-            getCurrentAccountAndBindView();
+            getCurrentAccountAndInitializeFragment();
         }
 
         userThingSortTypeBottomSheetFragment = new UserThingSortTypeBottomSheetFragment();
     }
 
-    private void getCurrentAccountAndBindView() {
+    private void getCurrentAccountAndInitializeFragment() {
         new GetCurrentAccountAsyncTask(mRedditDataRoomDatabase.accountDao(), account -> {
             if(account == null) {
                 mNullAccessToken = true;
@@ -167,6 +174,16 @@ public class AccountPostsActivity extends AppCompatActivity implements UserThing
         if(mUserWhere != null && mUserWhere.equals(PostDataSource.USER_WHERE_GILDED)) {
             menu.findItem(R.id.action_sort_account_posts_activity).setVisible(true);
         }
+        MenuItem lazyModeItem = mMenu.findItem(R.id.action_lazy_mode_account_posts_activity);
+        if(isInLazyMode) {
+            lazyModeItem.setTitle(R.string.action_stop_lazy_mode);
+            params.setScrollFlags(AppBarLayout.LayoutParams.SCROLL_FLAG_NO_SCROLL);
+            collapsingToolbarLayout.setLayoutParams(params);
+        } else {
+            lazyModeItem.setTitle(R.string.action_start_lazy_mode);
+            params.setScrollFlags(AppBarLayout.LayoutParams.SCROLL_FLAG_SCROLL | AppBarLayout.LayoutParams.SCROLL_FLAG_ENTER_ALWAYS);
+            collapsingToolbarLayout.setLayoutParams(params);
+        }
         return true;
     }
 
@@ -182,6 +199,20 @@ public class AccountPostsActivity extends AppCompatActivity implements UserThing
                 }
                 return true;
             case R.id.action_lazy_mode_account_posts_activity:
+                MenuItem lazyModeItem = mMenu.findItem(R.id.action_lazy_mode_account_posts_activity);
+                if(isInLazyMode) {
+                    ((FragmentCommunicator) mFragment).stopLazyMode();
+                    isInLazyMode = false;
+                    lazyModeItem.setTitle(R.string.action_start_lazy_mode);
+                    params.setScrollFlags(AppBarLayout.LayoutParams.SCROLL_FLAG_SCROLL | AppBarLayout.LayoutParams.SCROLL_FLAG_ENTER_ALWAYS);
+                    collapsingToolbarLayout.setLayoutParams(params);
+                } else {
+                    ((FragmentCommunicator) mFragment).startLazyMode();
+                    isInLazyMode = true;
+                    lazyModeItem.setTitle(R.string.action_stop_lazy_mode);
+                    params.setScrollFlags(AppBarLayout.LayoutParams.SCROLL_FLAG_NO_SCROLL);
+                    collapsingToolbarLayout.setLayoutParams(params);
+                }
                 return true;
             case android.R.id.home:
                 finish();
@@ -196,6 +227,7 @@ public class AccountPostsActivity extends AppCompatActivity implements UserThing
         if (mFragment != null) {
             getSupportFragmentManager().putFragment(outState, FRAGMENT_OUT_STATE, mFragment);
         }
+        outState.putBoolean(IS_IN_LAZY_MODE_STATE, isInLazyMode);
         outState.putString(ACCESS_TOKEN_STATE, mAccessToken);
         outState.putString(ACCOUNT_NAME_STATE, mAccountName);
         outState.putBoolean(NULL_ACCESS_TOKEN_STATE, mNullAccessToken);

app/src/main/java/ml/docilealligator/infinityforreddit/FollowedUsersListingFragment.java

@@ -13,7 +13,7 @@ import android.widget.ImageView;
 import android.widget.LinearLayout;
 
 import androidx.fragment.app.Fragment;
-import androidx.lifecycle.ViewModelProviders;
+import androidx.lifecycle.ViewModelProvider;
 import androidx.recyclerview.widget.LinearLayoutManager;
 import androidx.recyclerview.widget.RecyclerView;
 
@@ -79,7 +79,7 @@ public class FollowedUsersListingFragment extends Fragment {
         FollowedUsersRecyclerViewAdapter adapter = new FollowedUsersRecyclerViewAdapter(mActivity);
         mRecyclerView.setAdapter(adapter);
 
-        mSubscribedUserViewModel = ViewModelProviders.of(this,
+        mSubscribedUserViewModel = new ViewModelProvider(this,
                 new SubscribedUserViewModel.Factory(mActivity.getApplication(), mRedditDataRoomDatabase, getArguments().getString(EXTRA_ACCOUNT_NAME)))
                 .get(SubscribedUserViewModel.class);
         mSubscribedUserViewModel.getAllSubscribedUsers().observe(this, subscribedUserData -> {

app/src/main/java/ml/docilealligator/infinityforreddit/MainActivity.java

@@ -26,7 +26,7 @@ import androidx.drawerlayout.widget.DrawerLayout;
 import androidx.fragment.app.Fragment;
 import androidx.fragment.app.FragmentManager;
 import androidx.fragment.app.FragmentPagerAdapter;
-import androidx.lifecycle.ViewModelProviders;
+import androidx.lifecycle.ViewModelProvider;
 import androidx.recyclerview.widget.LinearLayoutManager;
 import androidx.recyclerview.widget.RecyclerView;
 import androidx.viewpager.widget.ViewPager;
@@ -313,7 +313,7 @@ public class MainActivity extends AppCompatActivity implements SortTypeBottomShe
         accountRecyclerView.setNestedScrollingEnabled(false);
         accountRecyclerView.setAdapter(adapter);
 
-        accountViewModel = ViewModelProviders.of(this,
+        accountViewModel = new ViewModelProvider(this,
                 new AccountViewModel.Factory(getApplication(), mRedditDataRoomDatabase, mAccountName)).get(AccountViewModel.class);
         accountViewModel.getAccountsExceptCurrentAccountLiveData().observe(this, adapter::changeAccountsDataset);
 

app/src/main/java/ml/docilealligator/infinityforreddit/SubredditListingFragment.java

@@ -17,7 +17,7 @@ import android.widget.TextView;
 import androidx.annotation.NonNull;
 import androidx.coordinatorlayout.widget.CoordinatorLayout;
 import androidx.fragment.app.Fragment;
-import androidx.lifecycle.ViewModelProviders;
+import androidx.lifecycle.ViewModelProvider;
 import androidx.recyclerview.widget.LinearLayoutManager;
 import androidx.recyclerview.widget.RecyclerView;
 
@@ -124,7 +124,7 @@ public class SubredditListingFragment extends Fragment implements FragmentCommun
 
         SubredditListingViewModel.Factory factory = new SubredditListingViewModel.Factory(mRetrofit, query,
                 PostDataSource.SORT_TYPE_RELEVANCE);
-        mSubredditListingViewModel = ViewModelProviders.of(this, factory).get(SubredditListingViewModel.class);
+        mSubredditListingViewModel = new ViewModelProvider(this, factory).get(SubredditListingViewModel.class);
         mSubredditListingViewModel.getSubreddits().observe(this, subredditData -> mAdapter.submitList(subredditData));
 
         mSubredditListingViewModel.getInitialLoadingState().observe(this, networkState -> {

app/src/main/java/ml/docilealligator/infinityforreddit/SubscribedSubredditsListingFragment.java

@@ -14,7 +14,7 @@ import android.widget.LinearLayout;
 
 import androidx.annotation.NonNull;
 import androidx.fragment.app.Fragment;
-import androidx.lifecycle.ViewModelProviders;
+import androidx.lifecycle.ViewModelProvider;
 import androidx.recyclerview.widget.LinearLayoutManager;
 import androidx.recyclerview.widget.RecyclerView;
 
@@ -93,7 +93,7 @@ public class SubscribedSubredditsListingFragment extends Fragment {
 
         mRecyclerView.setAdapter(adapter);
 
-        mSubscribedSubredditViewModel = ViewModelProviders.of(this,
+        mSubscribedSubredditViewModel = new ViewModelProvider(this,
                 new SubscribedSubredditViewModel.Factory(mActivity.getApplication(), mRedditDataRoomDatabase, accountName))
                 .get(SubscribedSubredditViewModel.class);
         mSubscribedSubredditViewModel.getAllSubscribedSubreddits().observe(this, subscribedSubredditData -> {

app/src/main/java/ml/docilealligator/infinityforreddit/UserListingFragment.java

@@ -14,7 +14,7 @@ import android.widget.TextView;
 
 import androidx.coordinatorlayout.widget.CoordinatorLayout;
 import androidx.fragment.app.Fragment;
-import androidx.lifecycle.ViewModelProviders;
+import androidx.lifecycle.ViewModelProvider;
 import androidx.recyclerview.widget.LinearLayoutManager;
 import androidx.recyclerview.widget.RecyclerView;
 
@@ -103,7 +103,7 @@ public class UserListingFragment extends Fragment implements FragmentCommunicato
 
         UserListingViewModel.Factory factory = new UserListingViewModel.Factory(mRetrofit, mQuery,
                 PostDataSource.SORT_TYPE_RELEVANCE);
-        mUserListingViewModel = ViewModelProviders.of(this, factory).get(UserListingViewModel.class);
+        mUserListingViewModel = new ViewModelProvider(this, factory).get(UserListingViewModel.class);
         mUserListingViewModel.getUsers().observe(this, UserData -> mAdapter.submitList(UserData));
 
         mUserListingViewModel.getInitialLoadingState().observe(this, networkState -> {

app/src/main/java/ml/docilealligator/infinityforreddit/ViewSubredditDetailActivity.java

@@ -20,7 +20,7 @@ import androidx.appcompat.app.AppCompatActivity;
 import androidx.appcompat.widget.Toolbar;
 import androidx.coordinatorlayout.widget.CoordinatorLayout;
 import androidx.fragment.app.Fragment;
-import androidx.lifecycle.ViewModelProviders;
+import androidx.lifecycle.ViewModelProvider;
 
 import com.bumptech.glide.Glide;
 import com.bumptech.glide.RequestManager;
@@ -135,13 +135,6 @@ public class ViewSubredditDetailActivity extends AppCompatActivity implements So
                     }
                 });
 
-                int statusBarResourceId = getResources().getIdentifier("status_bar_height", "dimen", "android");
-                if (statusBarResourceId > 0) {
-                    ViewGroup.MarginLayoutParams params = (ViewGroup.MarginLayoutParams) toolbar.getLayoutParams();
-                    params.topMargin = getResources().getDimensionPixelSize(statusBarResourceId);
-                    toolbar.setLayoutParams(params);
-                }
-
                 int navBarResourceId = resources.getIdentifier("navigation_bar_height", "dimen", "android");
                 if (navBarResourceId > 0) {
                     CoordinatorLayout.LayoutParams params = (CoordinatorLayout.LayoutParams) fab.getLayoutParams();
@@ -195,14 +188,14 @@ public class ViewSubredditDetailActivity extends AppCompatActivity implements So
         subredditNameTextView.setText(title);
 
         toolbar.setTitle(title);
+        ViewGroup.MarginLayoutParams toolbarParams = (ViewGroup.MarginLayoutParams) toolbar.getLayoutParams();
+        toolbarParams.topMargin = statusBarHeight;
+        toolbar.setLayoutParams(toolbarParams);
         setSupportActionBar(toolbar);
 
-        ViewGroup.MarginLayoutParams params = (ViewGroup.MarginLayoutParams) toolbar.getLayoutParams();
-        params.topMargin = statusBarHeight;
-
         glide = Glide.with(this);
 
-        mSubredditViewModel = ViewModelProviders.of(this,
+        mSubredditViewModel = new ViewModelProvider(this,
                 new SubredditViewModel.Factory(getApplication(), mRedditDataRoomDatabase, subredditName))
                 .get(SubredditViewModel.class);
         mSubredditViewModel.getSubredditLiveData().observe(this, subredditData -> {

app/src/main/java/ml/docilealligator/infinityforreddit/ViewUserDetailActivity.java

@@ -22,7 +22,7 @@ import androidx.coordinatorlayout.widget.CoordinatorLayout;
 import androidx.fragment.app.Fragment;
 import androidx.fragment.app.FragmentManager;
 import androidx.fragment.app.FragmentPagerAdapter;
-import androidx.lifecycle.ViewModelProviders;
+import androidx.lifecycle.ViewModelProvider;
 import androidx.viewpager.widget.ViewPager;
 
 import com.bumptech.glide.Glide;
@@ -145,15 +145,16 @@ public class ViewUserDetailActivity extends AppCompatActivity implements UserThi
             statusBarHeight = resources.getDimensionPixelSize(resourceId);
         }
 
-        String title = "u/" + username;
-        userNameTextView.setText(title);
-
         Toolbar toolbar = findViewById(R.id.toolbar);
-        toolbar.setTitle(title);
-        setSupportActionBar(toolbar);
-
         ViewGroup.MarginLayoutParams toolbarLayoutParams = (ViewGroup.MarginLayoutParams) toolbar.getLayoutParams();
         toolbarLayoutParams.topMargin = statusBarHeight;
+        toolbar.setLayoutParams(toolbarLayoutParams);
+
+        String title = "u/" + username;
+        userNameTextView.setText(title);
+        toolbar.setTitle(title);
+
+        setSupportActionBar(toolbar);
 
         expandedTabTextColor = resources.getColor(R.color.tabLayoutWithExpandedCollapsingToolbarTextColor);
         expandedTabBackgroundColor = resources.getColor(R.color.tabLayoutWithExpandedCollapsingToolbarTabBackground);
@@ -197,15 +198,7 @@ public class ViewUserDetailActivity extends AppCompatActivity implements UserThi
                 }
             });
 
-            int statusBarResourceId = resources.getIdentifier("status_bar_height", "dimen", "android");
-            if (statusBarResourceId > 0) {
-                int navBarHeight = resources.getDimensionPixelSize(statusBarResourceId);
-                ViewGroup.MarginLayoutParams params = (ViewGroup.MarginLayoutParams) toolbar.getLayoutParams();
-                params.topMargin = navBarHeight;
-                toolbar.setLayoutParams(params);
-
             showToast = true;
-            }
         } else {
             appBarLayout.addOnOffsetChangedListener(new AppBarStateChangeListener() {
                 @Override
@@ -226,7 +219,7 @@ public class ViewUserDetailActivity extends AppCompatActivity implements UserThi
         subscribedUserDao = mRedditDataRoomDatabase.subscribedUserDao();
         glide = Glide.with(this);
 
-        userViewModel = ViewModelProviders.of(this, new UserViewModel.Factory(getApplication(), mRedditDataRoomDatabase, username))
+        userViewModel = new ViewModelProvider(this, new UserViewModel.Factory(getApplication(), mRedditDataRoomDatabase, username))
                 .get(UserViewModel.class);
         userViewModel.getUserLiveData().observe(this, userData -> {
             if (userData != null) {
@@ -280,13 +273,13 @@ public class ViewUserDetailActivity extends AppCompatActivity implements UserThi
                                             public void onUserFollowingSuccess() {
                                                 subscribeUserChip.setText(R.string.unfollow);
                                                 subscribeUserChip.setChipBackgroundColor(resources.getColorStateList(R.color.colorAccent));
-                                                makeSnackbar(R.string.followed, false);
+                                                showMessage(R.string.followed, false);
                                                 subscriptionReady = true;
                                             }
 
                                             @Override
                                             public void onUserFollowingFail() {
-                                                makeSnackbar(R.string.follow_failed, false);
+                                                showMessage(R.string.follow_failed, false);
                                                 subscriptionReady = true;
                                             }
                                         });
@@ -297,13 +290,13 @@ public class ViewUserDetailActivity extends AppCompatActivity implements UserThi
                                             public void onUserFollowingSuccess() {
                                                 subscribeUserChip.setText(R.string.follow);
                                                 subscribeUserChip.setChipBackgroundColor(resources.getColorStateList(R.color.backgroundColorPrimaryDark));
-                                                makeSnackbar(R.string.unfollowed, false);
+                                                showMessage(R.string.unfollowed, false);
                                                 subscriptionReady = true;
                                             }
 
                                             @Override
                                             public void onUserFollowingFail() {
-                                                makeSnackbar(R.string.unfollow_failed, false);
+                                                showMessage(R.string.unfollow_failed, false);
                                                 subscriptionReady = true;
                                             }
                                         });
@@ -396,7 +389,7 @@ public class ViewUserDetailActivity extends AppCompatActivity implements UserThi
 
                 @Override
                 public void onFetchUserDataFailed() {
-                    makeSnackbar(R.string.cannot_fetch_user_info, true);
+                    showMessage(R.string.cannot_fetch_user_info, true);
                     mFetchUserInfoSuccess = false;
                 }
             });
@@ -493,7 +486,7 @@ public class ViewUserDetailActivity extends AppCompatActivity implements UserThi
         outState.putString(ACCOUNT_NAME_STATE, mAccountName);
     }
 
-    private void makeSnackbar(int resId, boolean retry) {
+    private void showMessage(int resId, boolean retry) {
         if(showToast) {
             Toast.makeText(this, resId, Toast.LENGTH_SHORT).show();
         } else {

app/src/main/res/layout/activity_account_posts.xml

@@ -13,6 +13,7 @@
         android:theme="@style/AppTheme.AppBarOverlay">
 
         <com.google.android.material.appbar.CollapsingToolbarLayout
+            android:id="@+id/collapsing_toolbar_layout_account_posts_activity"
             android:layout_width="match_parent"
             android:layout_height="match_parent"
             app:layout_scrollFlags="scroll|enterAlways"