add use of retropiler

Author: gfx

app/build.gradle

@@ -1,4 +1,5 @@
 apply plugin: 'com.android.application'
+apply plugin: 'io.github.retropiler'
 
 android {
     compileSdkVersion 25
@@ -17,10 +18,14 @@ android {
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
         }
     }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
 }
 
 dependencies {
-    compile fileTree(dir: 'libs', include: ['*.jar'])
+    compile fileTree(include: ['*.jar'], dir: 'libs')
     androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
         exclude group: 'com.android.support', module: 'support-annotations'
     })

app/src/main/java/io/github/gfx/java8androidexample/MainActivity.java

@@ -1,13 +1,22 @@
 package io.github.gfx.java8androidexample;
 
-import android.support.v7.app.AppCompatActivity;
+import android.annotation.SuppressLint;
 import android.os.Bundle;
+import android.support.v7.app.AppCompatActivity;
+import android.widget.TextView;
+
+import java.util.Optional;
 
+@SuppressLint("NewApi")
 public class MainActivity extends AppCompatActivity {
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
+
+        TextView textView = (TextView) findViewById(R.id.text);
+
+        Optional.of("foo").map(String::toUpperCase).ifPresent(textView::setText);
     }
 }

build.gradle

@@ -6,9 +6,7 @@ buildscript {
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:2.3.1'
-
-        // NOTE: Do not place your application dependencies here; they belong
-        // in the individual module build.gradle files
+        classpath 'io.github.retropiler:retropiler-gradle-plugin:0.0.2'
     }
 }