fix some lint warnings

app/src/main/java/com/keylesspalace/tusky/db/TootDao.java

@@ -19,8 +19,6 @@ import android.arch.persistence.room.Dao;
 import android.arch.persistence.room.Insert;
 import android.arch.persistence.room.OnConflictStrategy;
 import android.arch.persistence.room.Query;
-import android.arch.persistence.room.Transaction;
-import android.arch.persistence.room.Update;
 
 import java.util.List;
 

app/src/main/java/com/keylesspalace/tusky/fragment/NotificationsFragment.java

@@ -16,7 +16,6 @@
 package com.keylesspalace.tusky.fragment;
 
 import android.app.Activity;
-import android.app.NotificationManager;
 import android.arch.core.util.Function;
 import android.content.Context;
 import android.content.SharedPreferences;
@@ -38,7 +37,6 @@ import android.view.View;
 import android.view.ViewGroup;
 
 import com.keylesspalace.tusky.MainActivity;
-import com.keylesspalace.tusky.NotificationPullJobCreator;
 import com.keylesspalace.tusky.adapter.FooterViewHolder;
 import com.keylesspalace.tusky.adapter.NotificationsAdapter;
 import com.keylesspalace.tusky.R;
@@ -493,12 +491,7 @@ public class NotificationsFragment extends SFragment implements
             /* When this is called by the EndlessScrollListener it cannot refresh the footer state
              * using adapter.notifyItemChanged. So its necessary to postpone doing so until a
              * convenient time for the UI thread using a Runnable. */
-            recyclerView.post(new Runnable() {
-                @Override
-                public void run() {
-                    adapter.setFooterState(FooterViewHolder.State.LOADING);
-                }
-            });
+            recyclerView.post(() -> adapter.setFooterState(FooterViewHolder.State.LOADING));
         }
 
         Call<List<Notification>> call = mastodonApi.notifications(fromId, uptoId, LOAD_AT_ONCE);
@@ -613,7 +606,7 @@ public class NotificationsFragment extends SFragment implements
             int newIndex = liftedNew.indexOf(notifications.get(0));
             if (newIndex == -1) {
                 if (index == -1 && liftedNew.size() >= LOAD_AT_ONCE) {
-                    liftedNew.add(Either.<Placeholder, Notification>left(Placeholder.getInstance()));
+                    liftedNew.add(Either.left(Placeholder.getInstance()));
                 }
                 notifications.addAll(0, liftedNew);
             } else {
@@ -678,7 +671,7 @@ public class NotificationsFragment extends SFragment implements
         // If we fetched at least as much it means that there are more posts to load and we should
         // insert new placeholder
         if (newNotifications.size() >= LOAD_AT_ONCE) {
-            liftedNew.add(Either.<Placeholder, Notification>left(Placeholder.getInstance()));
+            liftedNew.add(Either.left(Placeholder.getInstance()));
         }
 
         notifications.addAll(pos, liftedNew);
@@ -686,12 +679,7 @@ public class NotificationsFragment extends SFragment implements
     }
 
     private final Function<Notification, Either<Placeholder, Notification>> notificationLifter =
-            new Function<Notification, Either<Placeholder, Notification>>() {
-                @Override
-                public Either<Placeholder, Notification> apply(Notification input) {
-                    return Either.right(input);
-                }
-            };
+            Either::right;
 
     private List<Either<Placeholder, Notification>> liftNotificationList(List<Notification> list) {
         return CollectionUtil.map(list, notificationLifter);

app/src/main/java/com/keylesspalace/tusky/fragment/TimelineFragment.java

@@ -552,12 +552,7 @@ public class TimelineFragment extends SFragment implements
             /* When this is called by the EndlessScrollListener it cannot refresh the footer state
              * using adapter.notifyItemChanged. So its necessary to postpone doing so until a
              * convenient time for the UI thread using a Runnable. */
-            recyclerView.post(new Runnable() {
-                @Override
-                public void run() {
-                    adapter.setFooterState(FooterViewHolder.State.LOADING);
-                }
-            });
+            recyclerView.post(() -> adapter.setFooterState(FooterViewHolder.State.LOADING));
         }
 
         Callback<List<Status>> callback = new Callback<List<Status>>() {
@@ -705,7 +700,7 @@ public class TimelineFragment extends SFragment implements
             int newIndex = liftedNew.indexOf(statuses.get(0));
             if (newIndex == -1) {
                 if (index == -1 && fullFetch) {
-                    liftedNew.add(Either.<Placeholder, Status>left(Placeholder.getInstance()));
+                    liftedNew.add(Either.left(Placeholder.getInstance()));
                 }
                 statuses.addAll(0, liftedNew);
             } else {
@@ -755,7 +750,7 @@ public class TimelineFragment extends SFragment implements
         List<Either<Placeholder, Status>> liftedNew = listStatusList(newStatuses);
 
         if (fullFetch) {
-            liftedNew.add(Either.<Placeholder, Status>left(Placeholder.getInstance()));
+            liftedNew.add(Either.left(Placeholder.getInstance()));
         }
 
         statuses.addAll(pos, liftedNew);
@@ -773,12 +768,7 @@ public class TimelineFragment extends SFragment implements
     }
 
     private final Function<Status, Either<Placeholder, Status>> statusLifter =
-            new Function<Status, Either<Placeholder, Status>>() {
-                @Override
-                public Either<Placeholder, Status> apply(Status input) {
-                    return Either.right(input);
-                }
-            };
+            Either::right;
 
     private @Nullable
     Pair<StatusViewData.Concrete, Integer>

app/src/main/java/com/keylesspalace/tusky/util/MediaUtils.java

@@ -20,23 +20,15 @@ import android.content.Context;
 import android.database.Cursor;
 import android.graphics.Bitmap;
 import android.graphics.BitmapFactory;
-import android.graphics.drawable.Drawable;
 import android.media.MediaMetadataRetriever;
 import android.media.ThumbnailUtils;
 import android.net.Uri;
-import android.os.Environment;
 import android.provider.OpenableColumns;
 import android.support.annotation.Nullable;
 import android.support.annotation.Px;
-import android.support.v4.content.FileProvider;
-
-import com.squareup.picasso.Picasso;
-import com.squareup.picasso.Target;
 
 import java.io.ByteArrayOutputStream;
-import java.io.File;
 import java.io.FileNotFoundException;
-import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;