Move android and rpi examples to others

examples/others/android/example/README.md

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+### Android example
+
+To compile example to shared library you will need [Android NDK](https://developer.android.com/ndk/downloads/index.html).
+To build Android apk you will need [Android SDK](http://developer.android.com/sdk/index.html#Other).
+
+Export path to Android NDK, point to location where you have unpacked archive:
+
+    export ANDROID_NDK_HOME=/opt/android-ndk
+
+Add toolchain bin directory to PATH:
+
+    export PATH=${ANDROID_NDK_HOME}/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin:${PATH}
+
+Export sysroot path:
+    
+    export ANDROID_SYSROOT=${ANDROID_NDK_HOME}/platforms/android-16/arch-arm
+
+And compile shared library:
+
+    CC=arm-linux-androideabi-gcc \
+    CGO_CFLAGS="-I${ANDROID_SYSROOT}/usr/include --sysroot=${ANDROID_SYSROOT}" \
+    CGO_LDFLAGS="-L${ANDROID_SYSROOT}/usr/lib --sysroot=${ANDROID_SYSROOT}" \
+    CGO_ENABLED=1 GOOS=android GOARCH=arm \
+    go build -buildmode=c-shared -ldflags="-s -w -extldflags=-Wl,-soname,libexample.so" \
+    -o=android/libs/armeabi-v7a/libexample.so
+
+To build apk export path to Android SDK, point to location where you unpacked archive:
+
+    export ANDROID_HOME=/opt/android-sdk
+
+And build apk with ant:
+
+    cd android
+    ant clean debug
+
+If everything is successfully built apk can be found in bin/ directory.

examples/others/android/example/android/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
+        package="com.github.gen2brain.raylib.go" 
+        android:versionCode="1" 
+        android:versionName="1.0">
+
+    <uses-sdk android:minSdkVersion="14" android:targetSdkVersion="25" />
+    <uses-feature android:glEsVersion="0x00020000" android:required="true" />
+
+    <!-- We do not have Java code. Therefore android:hasCode is set to false. -->
+    <application android:allowBackup="false" android:hasCode="false" 
+                android:label="@string/app_name" 
+                android:icon="@drawable/icon"
+                android:theme="@android:style/Theme.Holo.NoActionBar.Fullscreen" >
+
+        <!-- Our activity is the built-in NativeActivity framework class. -->
+        <activity android:name="android.app.NativeActivity"
+                android:configChanges="orientation|keyboardHidden|screenSize"
+                android:screenOrientation="landscape"
+                android:clearTaskOnLaunch="true">
+
+            <!-- Tell NativeActivity the name of our .so -->
+            <meta-data android:name="android.app.lib_name" android:value="example" />
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+
+    </application>
+    
+</manifest>

examples/others/android/example/android/build.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project name="example" default="help">
+
+    <!-- The local.properties file is created and updated by the 'android' tool.
+         It contains the path to the SDK. It should *NOT* be checked into
+         Version Control Systems. -->
+    <property file="local.properties" />
+
+    <!-- The ant.properties file can be created by you. It is only edited by the
+         'android' tool to add properties to it.
+         This is the place to change some Ant specific build properties.
+         Here are some properties you may want to change/update:
+
+         source.dir
+             The name of the source directory. Default is 'src'.
+         out.dir
+             The name of the output directory. Default is 'bin'.
+
+         For other overridable properties, look at the beginning of the rules
+         files in the SDK, at tools/ant/build.xml
+
+         Properties related to the SDK location or the project target should
+         be updated using the 'android' tool with the 'update' action.
+
+         This file is an integral part of the build system for your
+         application and should be checked into Version Control Systems.
+
+         -->
+    <property file="ant.properties" />
+
+    <!-- if sdk.dir was not set from one of the property file, then
+         get it from the ANDROID_HOME env var.
+         This must be done before we load project.properties since
+         the proguard config can use sdk.dir -->
+    <property environment="env" />
+    <condition property="sdk.dir" value="${env.ANDROID_HOME}">
+        <isset property="env.ANDROID_HOME" />
+    </condition>
+
+    <!-- The project.properties file is created and updated by the 'android'
+         tool, as well as ADT.
+
+         This contains project specific properties such as project target, and library
+         dependencies. Lower level build properties are stored in ant.properties
+         (or in .classpath for Eclipse projects).
+
+         This file is an integral part of the build system for your
+         application and should be checked into Version Control Systems. -->
+    <loadproperties srcFile="project.properties" />
+
+    <!-- quick check on sdk.dir -->
+    <fail
+            message="sdk.dir is missing. Make sure to generate local.properties using 'android update project' or to inject it through the ANDROID_HOME environment variable."
+            unless="sdk.dir"
+    />
+
+    <!--
+        Import per project custom build rules if present at the root of the project.
+        This is the place to put custom intermediary targets such as:
+            -pre-build
+            -pre-compile
+            -post-compile (This is typically used for code obfuscation.
+                           Compiled code location: ${out.classes.absolute.dir}
+                           If this is not done in place, override ${out.dex.input.absolute.dir})
+            -post-package
+            -post-build
+            -pre-clean
+    -->
+    <import file="custom_rules.xml" optional="true" />
+
+    <!-- Import the actual build file.
+
+         To customize existing targets, there are two options:
+         - Customize only one target:
+             - copy/paste the target into this file, *before* the
+               <import> task.
+             - customize it to your needs.
+         - Customize the whole content of build.xml
+             - copy/paste the content of the rules files (minus the top node)
+               into this file, replacing the <import> task.
+             - customize to your needs.
+
+         ***********************
+         ****** IMPORTANT ******
+         ***********************
+         In all cases you must update the value of version-tag below to read 'custom' instead of an integer,
+         in order to avoid having your file be overridden by tools such as "android update project"
+    -->
+    <!-- version-tag: 1 -->
+    <import file="${sdk.dir}/tools/ant/build.xml" />
+
+</project>

examples/others/android/example/android/project.properties

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+# Project target.
+target=android-27

examples/others/android/example/android/res/values/strings.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="app_name">raylib-go</string>
+</resources>

examples/others/android/example/main.go

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+package main
+
+import (
+	"os"
+	"runtime"
+
+	"github.com/gen2brain/raylib-go/raylib"
+)
+
+// Game states
+const (
+	Logo = iota
+	Title
+	GamePlay
+	Ending
+)
+
+func init() {
+	raylib.SetCallbackFunc(main)
+}
+
+func main() {
+	screenWidth := int32(800)
+	screenHeight := int32(450)
+
+	raylib.SetConfigFlags(raylib.FlagVsyncHint)
+
+	raylib.InitWindow(screenWidth, screenHeight, "Android example")
+
+	raylib.InitAudioDevice()
+
+	currentScreen := Logo
+	windowShouldClose := false
+
+	texture := raylib.LoadTexture("raylib_logo.png") // Load texture (placed on assets folder)
+	fx := raylib.LoadSound("coin.wav")               // Load WAV audio file (placed on assets folder)
+	ambient := raylib.LoadMusicStream("ambient.ogg") // Load music
+
+	raylib.PlayMusicStream(ambient)
+
+	framesCounter := 0 // Used to count frames
+
+	//raylib.SetTargetFPS(60)
+
+	for !windowShouldClose {
+		raylib.UpdateMusicStream(ambient)
+
+		if runtime.GOOS == "android" && raylib.IsKeyDown(raylib.KeyBack) || raylib.WindowShouldClose() {
+			windowShouldClose = true
+		}
+
+		switch currentScreen {
+		case Logo:
+			framesCounter++ // Count frames
+
+			// Wait for 4 seconds (240 frames) before jumping to Title screen
+			if framesCounter > 240 {
+				currentScreen = Title
+			}
+			break
+		case Title:
+			// Press enter to change to GamePlay screen
+			if raylib.IsGestureDetected(raylib.GestureTap) {
+				raylib.PlaySound(fx)
+				currentScreen = GamePlay
+			}
+			break
+		case GamePlay:
+			// Press enter to change to Ending screen
+			if raylib.IsGestureDetected(raylib.GestureTap) {
+				raylib.PlaySound(fx)
+				currentScreen = Ending
+			}
+			break
+		case Ending:
+			// Press enter to return to Title screen
+			if raylib.IsGestureDetected(raylib.GestureTap) {
+				raylib.PlaySound(fx)
+				currentScreen = Title
+			}
+			break
+		}
+
+		raylib.BeginDrawing()
+
+		raylib.ClearBackground(raylib.RayWhite)
+
+		switch currentScreen {
+		case Logo:
+			raylib.DrawText("LOGO SCREEN", 20, 20, 40, raylib.LightGray)
+			raylib.DrawTexture(texture, screenWidth/2-texture.Width/2, screenHeight/2-texture.Height/2, raylib.White)
+			raylib.DrawText("WAIT for 4 SECONDS...", 290, 400, 20, raylib.Gray)
+			break
+		case Title:
+			raylib.DrawRectangle(0, 0, screenWidth, screenHeight, raylib.Green)
+			raylib.DrawText("TITLE SCREEN", 20, 20, 40, raylib.DarkGreen)
+			raylib.DrawText("TAP SCREEN to JUMP to GAMEPLAY SCREEN", 160, 220, 20, raylib.DarkGreen)
+			break
+		case GamePlay:
+			raylib.DrawRectangle(0, 0, screenWidth, screenHeight, raylib.Purple)
+			raylib.DrawText("GAMEPLAY SCREEN", 20, 20, 40, raylib.Maroon)
+			raylib.DrawText("TAP SCREEN to JUMP to ENDING SCREEN", 170, 220, 20, raylib.Maroon)
+			break
+		case Ending:
+			raylib.DrawRectangle(0, 0, screenWidth, screenHeight, raylib.Blue)
+			raylib.DrawText("ENDING SCREEN", 20, 20, 40, raylib.DarkBlue)
+			raylib.DrawText("TAP SCREEN to RETURN to TITLE SCREEN", 160, 220, 20, raylib.DarkBlue)
+			break
+		default:
+			break
+		}
+
+		raylib.EndDrawing()
+	}
+
+	raylib.UnloadSound(fx)            // Unload sound data
+	raylib.UnloadMusicStream(ambient) // Unload music stream data
+	raylib.CloseAudioDevice()         // Close audio device (music streaming is automatically stopped)
+	raylib.UnloadTexture(texture)     // Unload texture data
+	raylib.CloseWindow()              // Close window
+
+	os.Exit(0)
+}