Compilation for Android on Java 9+

android/build.gradle

@@ -33,6 +33,8 @@ dependencies{
     natives "com.github.Anuken.Arc:natives-android:${getArcHash()}"
     natives "com.github.Anuken.Arc:natives-freetype-android:${getArcHash()}"
     natives "com.github.Anuken.Arc:natives-box2d-android:${getArcHash()}"
+
+    if(localArc()) compileOnly fileTree(dir: '../../Arc/backends/backend-android/libs', include: ['*.jar'])
 }
 
 task deploy(type: Copy){

build.gradle

@@ -180,6 +180,15 @@ allprojects{
     }
 }
 
+//compile with java 8 compatibility for everything except the annotati project
+configure(subprojects - project(":annotations")){
+    tasks.withType(JavaCompile){
+        if(JavaVersion.current() != JavaVersion.VERSION_1_8){
+            options.compilerArgs.addAll(['--release', '8'])
+        }
+    }
+}
+
 project(":desktop"){
     apply plugin: "java"
 

core/src/mindustry/logic/LExecutor.java

@@ -501,7 +501,11 @@ public class LExecutor{
             //this should avoid any garbage allocation
             Var v = exec.vars[value];
             if(v.isobj && value != 0){
-                String strValue = v.objval instanceof String ? (String)v.objval : v.objval == null ? "null" : "[object]";
+                String strValue = v.objval instanceof String ? (String)v.objval : v.objval == null ? "null" :
+                    v.objval instanceof Content ? "[content]" :
+                    v.objval instanceof Building ? "[building]" :
+                    v.objval instanceof Unit ? "[unit]" :
+                    "[object]";
 
                 exec.textBuffer.append(strValue);
             }else{

core/src/mindustry/world/blocks/defense/Door.java

@@ -73,6 +73,12 @@ public class Door extends Wall{
             }
         }
 
+        @Override
+        public double sense(LAccess sensor){
+            if(sensor == LAccess.enabled) return open ? 1 : 0;
+            return super.sense(sensor);
+        }
+
         @Override
         public void control(LAccess type, double p1, double p2, double p3, double p4){
             if(type == LAccess.enabled){