added wallpaper sample

Author: codeanticode

studio/apps/wallpaper/build.gradle

@@ -0,0 +1,32 @@
+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion 26
+    buildToolsVersion '27.0.3'
+    defaultConfig {
+        applicationId "processing.tests.wallpaper"
+        minSdkVersion 17
+        targetSdkVersion 21
+        versionCode 1
+        versionName "1.0"
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+        }
+    }
+    productFlavors {
+    }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_7
+        targetCompatibility JavaVersion.VERSION_1_7
+    }
+}
+
+dependencies {
+    implementation fileTree(include: ['*.jar'], dir: 'libs')
+    testImplementation 'junit:junit:4.12'
+    implementation project(':libs:processing-core')
+    implementation 'com.android.support:appcompat-v7:26.0.2'
+}

studio/apps/wallpaper/src/main/AndroidManifest.xml

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android" android:versionCode="1" android:versionName="1.0" package="wallpaper">
+    <uses-sdk android:minSdkVersion="17" android:targetSdkVersion="26"/>
+    <uses-feature android:name="android.software.live_wallpaper"/>
+    <application android:icon="@mipmap/ic_launcher" android:label="wallpaper">
+        <service android:label="wallpaper" android:name=".MainService" android:permission="android.permission.BIND_WALLPAPER">
+            <intent-filter>
+                <action android:name="android.service.wallpaper.WallpaperService"/>
+            </intent-filter>
+            <meta-data android:name="android.service.wallpaper" android:resource="@xml/wallpaper"/>
+        </service>
+        <activity android:name="processing.android.PermissionRequestor"/>
+    </application>
+</manifest>

studio/apps/wallpaper/src/main/java/wallpaper/MainService.java

@@ -0,0 +1,12 @@
+package wallpaper;
+        
+import processing.android.PWallpaper;
+import processing.core.PApplet;
+        
+public class MainService extends PWallpaper {  
+  @Override
+  public PApplet createSketch() {
+    PApplet sketch = new Sketch();    
+    return sketch;
+  }
+}

studio/apps/wallpaper/src/main/java/wallpaper/Sketch.java

@@ -0,0 +1,41 @@
+package wallpaper;
+
+import processing.core.PApplet;
+
+public class Sketch extends PApplet {
+
+  float currH, currB;
+  float nextH, nextB;
+  float easing = 0.001f;
+  int lastChange = 0;
+
+  public void settings() {
+    fullScreen();
+  }
+
+  public void setup() {
+    colorMode(HSB, 100);
+    currH = nextH = 100;
+    currB = nextB = 100;
+  }
+
+  public void draw() {
+    background(currH, currB, 100);
+    updateCurrColor();
+    if (5000 < millis() - lastChange) {
+      pickNextColor();
+      lastChange = millis();
+    }
+  }
+
+  public void pickNextColor() {
+    nextH = random(100);
+    nextB = random(100);
+  }
+
+  public void updateCurrColor() {
+    // Easing between current and next colors
+    currH += easing * (nextH - currH);
+    currB += easing * (nextB - currB);
+  }
+}

studio/apps/wallpaper/src/main/res/layout/main.xml

@@ -0,0 +1,7 @@
+<fragment xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/fragment"
+    android:name=".wallpaper"
+    tools:layout="@layout/fragment_main"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent" />