Proposal/rehash: Use async Messaging

.travis.yml

@@ -7,8 +7,8 @@ android:
   components:
     - tools
     - platform-tools
-    - android-26
-    - build-tools-26.0.2
+    - android-28
+    - build-tools-28.0.0
 
 # as per http://blog.travis-ci.com/2014-12-17-faster-builds-with-container-based-infrastructure/
 sudo: false

build.gradle

@@ -1,12 +1,12 @@
-subprojects {
+allprojects {
     buildscript {
         repositories {
             mavenCentral()
             jcenter()
             google()
         }
         dependencies {
-            classpath 'com.android.tools.build:gradle:3.0.1'
+            classpath 'com.android.tools.build:gradle:3.1.3'
             classpath 'com.github.dcendents:android-maven-gradle-plugin:2.0'
             classpath 'com.jfrog.bintray.gradle:gradle-bintray-plugin:1.8.0'
             classpath 'org.jfrog.buildinfo:build-info-extractor-gradle:4.5.2'
@@ -15,12 +15,13 @@ subprojects {
 
     repositories {
         mavenCentral()
+        google()
     }
 }
 
 ext {
     minSdkVersion = 9
-    compileSdkVersion = 26
-    buildToolsVersion = '26.0.2'
+    compileSdkVersion = 28
+    buildToolsVersion = '28.0.0'
     sourceCompatibility = JavaVersion.VERSION_1_7
 }

gradle/wrapper/gradle-wrapper.properties

@@ -2,4 +2,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.8.1-all.zip

rxandroid/src/main/java/io/reactivex/android/schedulers/AndroidSchedulers.java

@@ -13,20 +13,21 @@
  */
 package io.reactivex.android.schedulers;
 
+import android.annotation.TargetApi;
+import android.os.Build;
 import android.os.Handler;
 import android.os.Looper;
-
-import java.util.concurrent.Callable;
-
 import io.reactivex.Scheduler;
 import io.reactivex.android.plugins.RxAndroidPlugins;
+import java.lang.reflect.InvocationTargetException;
+import java.util.concurrent.Callable;
 
 /** Android-specific Schedulers. */
 public final class AndroidSchedulers {
 
     private static final class MainHolder {
-
-        static final Scheduler DEFAULT = new HandlerScheduler(new Handler(Looper.getMainLooper()));
+        static final Scheduler DEFAULT
+            = new HandlerScheduler(createAsyncHandler(Looper.getMainLooper()));
     }
 
     private static final Scheduler MAIN_THREAD = RxAndroidPlugins.initMainThreadScheduler(
@@ -47,6 +48,28 @@ public static Scheduler from(Looper looper) {
         return new HandlerScheduler(new Handler(looper));
     }
 
+    @TargetApi(Build.VERSION_CODES.P)
+    private static Handler createAsyncHandler(Looper looper) {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
+            return Handler.createAsync(looper);
+        } else {
+            try {
+                //noinspection JavaReflectionMemberAccess
+                return Handler.class
+                    .getConstructor(Looper.class, Handler.Callback.class, boolean.class)
+                    .newInstance(looper, null, true);
+            } catch (IllegalAccessException e) {
+                return new Handler(looper);
+            } catch (InstantiationException e) {
+                return new Handler(looper);
+            } catch (NoSuchMethodException e) {
+                return new Handler(looper);
+            } catch (InvocationTargetException e) {
+                return new Handler(looper);
+            }
+        }
+    }
+
     private AndroidSchedulers() {
         throw new AssertionError("No instances.");
     }

sample-app/build.gradle

@@ -6,7 +6,7 @@ android {
 
     defaultConfig {
         minSdkVersion 15
-        targetSdkVersion 23
+        targetSdkVersion 28
         versionCode 1
         versionName '1.0'
     }