introduce retrolambda also into realm-helpers

app/lint.xml

@@ -2,4 +2,7 @@
   <issue id="InvalidPackage">
     <ignore regexp="okio.*jar"/>
   </issue>
+  <issue id="NewApi">
+    <ignore regexp="Try-with-resources requires API level 19"/>
+  </issue>
 </lint>
\ No newline at end of file

realm-helpers/build.gradle

 apply plugin: 'com.android.library'
 apply plugin: 'realm-android'
+apply plugin: 'me.tatarka.retrolambda'
 
 buildscript {
   repositories {
@@ -8,6 +9,8 @@ buildscript {
   dependencies {
     classpath rootProject.ext.androidPlugin
     classpath rootProject.ext.realmPlugin
+    classpath rootProject.ext.retroLambdaPlugin
+    classpath rootProject.ext.retroLambdaPatch
   }
 }
 
@@ -15,6 +18,10 @@ android {
   compileSdkVersion rootProject.ext.compileSdkVersion
   buildToolsVersion rootProject.ext.buildToolsVersion
 
+  compileOptions {
+    sourceCompatibility JavaVersion.VERSION_1_8
+    targetCompatibility JavaVersion.VERSION_1_8
+  }
   defaultConfig {
     minSdkVersion rootProject.ext.minSdkVersion
     targetSdkVersion rootProject.ext.compileSdkVersion

realm-helpers/lint.xml

+<lint>
+  <issue id="NewApi">
+    <ignore regexp="Try-with-resources requires API level 19"/>
+  </issue>
+</lint>
\ No newline at end of file

realm-helpers/src/main/java/chat/rocket/android/realm_helper/AbstractRealmResultsObserver.java

@@ -9,7 +9,9 @@ abstract class AbstractRealmResultsObserver<T extends RealmObject> {
   protected Realm realm;
 
   private RealmChangeListener<RealmResults<T>> listener;
+
   protected abstract RealmResults<T> queryItems(Realm realm);
+
   protected abstract RealmChangeListener<RealmResults<T>> getListener();
 
   private RealmResults<T> results;

realm-helpers/src/main/java/chat/rocket/android/realm_helper/RealmHelper.java

@@ -104,28 +104,22 @@ public class RealmHelper {
     final TaskCompletionSource<Void> task = new TaskCompletionSource<>();
 
     final Realm realm = instance();
-    realm.executeTransactionAsync(new Realm.Transaction() {
-      @Override public void execute(Realm realm) {
+    realm.executeTransactionAsync(_realm -> {
       try {
-          transaction.execute(realm);
+        transaction.execute(_realm);
       } catch (JSONException exception) {
         throw new RuntimeException(exception);
       }
-      }
-    }, new Realm.Transaction.OnSuccess() {
-      @Override public void onSuccess() {
+    }, () -> {
       realm.close();
       task.setResult(null);
-      }
-    }, new Realm.Transaction.OnError() {
-      @Override public void onError(Throwable error) {
+    }, error -> {
       realm.close();
       if (error instanceof Exception) {
         task.setError((Exception) error);
       } else {
         task.setError(new Exception(error));
       }
-      }
     });
 
     return task.getTask();

realm-helpers/src/main/java/chat/rocket/android/realm_helper/RealmListObserver.java

@@ -32,12 +32,10 @@ public class RealmListObserver<T extends RealmObject> extends AbstractRealmResul
   }
 
   @Override public final RealmChangeListener<RealmResults<T>> getListener() {
-    return new RealmChangeListener<RealmResults<T>>() {
-      @Override public void onChange(RealmResults<T> element) {
+    return element -> {
       if (onUpdateListener != null) {
         onUpdateListener.onUpdateResults(element);
       }
-      }
     };
   }
 }
\ No newline at end of file

realm-helpers/src/main/java/chat/rocket/android/realm_helper/RealmModelListAdapter.java

@@ -32,11 +32,7 @@ public abstract class RealmModelListAdapter<T extends RealmObject, VM,
   /*package*/ RealmModelListAdapter<T, VM, VH> initializeWith(final RealmHelper realmHelper,
       RealmListObserver.Query<T> query) {
     realmListObserver = new RealmListObserver<>(realmHelper, query)
-        .setOnUpdateListener(new RealmListObserver.OnUpdateListener<T>() {
-          @Override public void onUpdateResults(List<T> results) {
-            updateData(realmHelper.copyFromRealm(results));
-          }
-        });
+        .setOnUpdateListener(results -> updateData(realmHelper.copyFromRealm(results)));
     return this;
   }
 
@@ -71,13 +67,11 @@ public abstract class RealmModelListAdapter<T extends RealmObject, VM,
   @Override public void onBindViewHolder(VH holder, int position) {
     VM model = getItem(position);
     holder.itemView.setTag(model);
-    holder.itemView.setOnClickListener(new View.OnClickListener() {
-      @Override public void onClick(View view) {
+    holder.itemView.setOnClickListener(view -> {
       VM model2 = (VM) (view.getTag());
       if (model2 != null && onItemClickListener != null) {
         onItemClickListener.onItemClick(model2);
       }
-      }
     });
     holder.bind(model);
   }

realm-helpers/src/main/java/chat/rocket/android/realm_helper/RealmObjectObserver.java

@@ -48,8 +48,7 @@ public class RealmObjectObserver<T extends RealmObject> extends AbstractRealmRes
   }
 
   @Override protected final RealmChangeListener<RealmResults<T>> getListener() {
-    return new RealmChangeListener<RealmResults<T>>() {
-      @Override public void onChange(RealmResults<T> element) {
+    return element -> {
       T currentResult = impl.extractObjectFromResults(element);
       String currentResultString = currentResult != null ? currentResult.toString() : null;
       if (previousResultString != null && previousResultString.equals(currentResultString)) {
@@ -60,7 +59,6 @@ public class RealmObjectObserver<T extends RealmObject> extends AbstractRealmRes
         onUpdateListener.onUpdateObject(
             currentResult != null ? realm.copyFromRealm(currentResult) : null);
       }
-      }
     };
   }