feat : update dependency , targetSdk 27 , buildToolsVersion 27.0.3

Render/app/build.gradle

@@ -1,13 +1,13 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 21
-    buildToolsVersion "21.1.2"
+    compileSdkVersion 27
+    buildToolsVersion "27.0.3"
 
     defaultConfig {
         applicationId "com.example.android.mobileperf.render"
-        minSdkVersion 9
-        targetSdkVersion 21
+        minSdkVersion 21
+        targetSdkVersion 27
         versionCode 1
         versionName "1.0"
     }
@@ -20,7 +20,7 @@ android {
 }
 
 dependencies {
-    compile fileTree(dir: 'libs', include: ['*.jar'])
-    compile 'com.android.support:appcompat-v7:21.0.0'
-    compile 'com.squareup.picasso:picasso:2.2.0'
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+    implementation 'com.android.support:appcompat-v7:27.1.1'
+    implementation 'com.squareup.picasso:picasso:2.5.2'
 }

Render/app/src/main/java/com/example/android/mobileperf/render/ChatumLatinumActivity.java

@@ -17,13 +17,13 @@
 package com.example.android.mobileperf.render;
 
 import android.os.Bundle;
-import android.support.v7.app.ActionBarActivity;
+import android.support.v7.app.AppCompatActivity;
 
 /**
  * Displays a fragment that contains a ListView holding several Chat objects. Used in this lesson
  * to show a) how to reduce overdraws, and b) how to flatten needlessly nested hierarchies.
  */
-public class ChatumLatinumActivity extends ActionBarActivity {
+public class ChatumLatinumActivity extends AppCompatActivity {
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);

Render/app/src/main/java/com/example/android/mobileperf/render/MainActivity.java

@@ -18,7 +18,7 @@
 
 import android.content.Intent;
 import android.os.Bundle;
-import android.support.v7.app.ActionBarActivity;
+import android.support.v7.app.AppCompatActivity;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.Button;
@@ -28,7 +28,7 @@
  * simply as a table of contents: surfaces buttons that launch the ChatumLatinum and DroidCards
  * activities.
  */
-public class MainActivity extends ActionBarActivity {
+public class MainActivity extends AppCompatActivity {
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);

Render/build.gradle

@@ -3,9 +3,10 @@
 buildscript {
     repositories {
         jcenter()
+        google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:1.0.0'
+        classpath 'com.android.tools.build:gradle:3.1.4'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
@@ -15,5 +16,6 @@ buildscript {
 allprojects {
     repositories {
         jcenter()
+        google()
     }
 }

Render/gradle/wrapper/gradle-wrapper.properties

@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-2.2.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.4-all.zip