fix crash on Android 4

app/build.gradle

@@ -66,10 +66,9 @@ dependencies {
     compile 'com.evernote:android-job:1.2.0'
     implementation 'com.android.support.constraint:constraint-layout:1.0.2'
     //room
-    implementation "android.arch.persistence.room:runtime:1.0.0"
+    implementation 'android.arch.persistence.room:runtime:1.0.0'
     kapt 'android.arch.persistence.room:compiler:1.0.0'
-
-    testCompile "junit:junit:4.12"
+    testCompile 'junit:junit:4.12'
     androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
         exclude group: 'com.android.support', module: 'support-annotations'
     })

app/src/main/java/com/keylesspalace/tusky/TuskyApplication.java

@@ -17,7 +17,7 @@ package com.keylesspalace.tusky;
 
 import android.app.Application;
 import android.arch.persistence.room.Room;
-import android.net.Uri;
+import android.support.v7.app.AppCompatDelegate;
 
 import com.evernote.android.job.JobManager;
 import com.jakewharton.picasso.OkHttp3Downloader;
@@ -39,12 +39,7 @@ public class TuskyApplication extends Application {
         Picasso.Builder builder = new Picasso.Builder(this);
         builder.downloader(new OkHttp3Downloader(OkHttpUtils.getCompatibleClient()));
         if (BuildConfig.DEBUG) {
-            builder.listener(new Picasso.Listener() {
-                @Override
-                public void onImageLoadFailed(Picasso picasso, Uri uri, Exception exception) {
-                    exception.printStackTrace();
-                }
-            });
+            builder.listener((picasso, uri, exception) -> exception.printStackTrace());
         }
 
         try {
@@ -60,5 +55,8 @@ public class TuskyApplication extends Application {
                 .build();
 
         JobManager.create(this).addJobCreator(new NotificationPullJobCreator(this));
+
+        //necessary for Android < APi 21
+        AppCompatDelegate.setCompatVectorFromResourcesEnabled(true);
     }
 }

app/src/main/java/com/keylesspalace/tusky/adapter/NotificationsAdapter.java

@@ -246,6 +246,9 @@ public class NotificationsAdapter extends RecyclerView.Adapter {
             usernameView = itemView.findViewById(R.id.notification_username);
             displayNameView = itemView.findViewById(R.id.notification_display_name);
             avatar = itemView.findViewById(R.id.notification_avatar);
+            //workaround because Android < API 21 does not support setting drawableLeft from xml when it is a vector image
+            Drawable followIcon = ContextCompat.getDrawable(message.getContext(), R.drawable.ic_person_add_24dp);
+            message.setCompoundDrawablesWithIntrinsicBounds(followIcon, null, null, null);
         }
 
         void setMessage(String displayName, String username, String avatarUrl) {
@@ -270,12 +273,7 @@ public class NotificationsAdapter extends RecyclerView.Adapter {
         }
 
         void setupButtons(final NotificationActionListener listener, final String accountId) {
-            avatar.setOnClickListener(new View.OnClickListener() {
-                @Override
-                public void onClick(View v) {
-                    listener.onViewAccount(accountId);
-                }
-            });
+            avatar.setOnClickListener(v -> listener.onViewAccount(accountId));
         }
     }
 

app/src/main/java/com/keylesspalace/tusky/adapter/StatusViewHolder.java

@@ -16,6 +16,7 @@
 package com.keylesspalace.tusky.adapter;
 
 import android.content.Context;
+import android.graphics.drawable.Drawable;
 import android.os.Build;
 import android.support.annotation.Nullable;
 import android.view.View;
@@ -24,6 +25,7 @@ import android.widget.TextView;
 
 import com.keylesspalace.tusky.R;
 import com.keylesspalace.tusky.interfaces.StatusActionListener;
+import com.keylesspalace.tusky.util.ThemeUtils;
 import com.keylesspalace.tusky.view.RoundedTransformation;
 import com.keylesspalace.tusky.viewdata.StatusViewData;
 import com.squareup.picasso.Picasso;
@@ -37,6 +39,10 @@ public class StatusViewHolder extends StatusBaseViewHolder {
         super(itemView);
         avatarReblog = itemView.findViewById(R.id.status_avatar_reblog);
         rebloggedBar = itemView.findViewById(R.id.status_reblogged);
+        //workaround because Android < API 21 does not support setting drawableLeft from xml when it is a vector image
+        Drawable rebloggedIcon = ThemeUtils.getDrawable(rebloggedBar.getContext(),
+                R.attr.status_reblog_small_drawable, R.drawable.ic_reblog_dark_18dp);
+        rebloggedBar.setCompoundDrawablesWithIntrinsicBounds(rebloggedIcon, null, null, null);
     }
 
     @Override
@@ -84,12 +90,7 @@ public class StatusViewHolder extends StatusBaseViewHolder {
         // I think it's not efficient to create new object every time we bind a holder.
         // More efficient approach would be creating View.OnClickListener during holder creation
         // and storing StatusActionListener in a variable after binding.
-        rebloggedBar.setOnClickListener(new View.OnClickListener() {
-            @Override
-            public void onClick(View v) {
-                listener.onOpenReblog(getAdapterPosition());
-            }
-        });
+        rebloggedBar.setOnClickListener(v -> listener.onOpenReblog(getAdapterPosition()));
     }
 
     private void setRebloggedByDisplayName(String name) {

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

@@ -17,9 +17,7 @@
         android:layout_height="wrap_content"
         android:layout_marginBottom="4dp"
         android:layout_marginTop="8dp"
-        android:drawableLeft="@drawable/ic_person_add_24dp"
         android:drawablePadding="10dp"
-        android:drawableStart="@drawable/ic_person_add_24dp"
         android:ellipsize="end"
         android:gravity="center_vertical"
         android:maxLines="1"

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

@@ -13,9 +13,7 @@
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:layout_marginTop="@dimen/status_reblogged_bar_top_padding"
-        android:drawableLeft="?attr/status_reblog_small_drawable"
         android:drawablePadding="6dp"
-        android:drawableStart="?attr/status_reblog_small_drawable"
         android:gravity="center_vertical"
         android:paddingLeft="38dp"
         android:paddingStart="38dp"