add a couple more click listeners to About section

app/src/main/kotlin/com/simplemobiletools/applauncher/activities/AboutActivity.kt

@@ -1,11 +1,17 @@
 package com.simplemobiletools.applauncher.activities
 
+import android.content.ActivityNotFoundException
+import android.content.Intent
+import android.net.Uri
 import android.os.Bundle
 import android.support.v7.app.AppCompatActivity
 import android.text.Html
 import android.text.method.LinkMovementMethod
+import android.view.View
 import com.simplemobiletools.applauncher.BuildConfig
 import com.simplemobiletools.applauncher.R
+import com.simplemobiletools.applauncher.extensions.isFirstRun
+import com.simplemobiletools.applauncher.extensions.preferences
 import kotlinx.android.synthetic.main.activity_about.*
 import java.util.*
 
@@ -17,6 +23,8 @@ class AboutActivity : AppCompatActivity() {
 
         setupEmail()
         setupCopyright()
+        setupRateUs()
+        setupSocial()
     }
 
     private fun setupEmail() {
@@ -32,4 +40,42 @@ class AboutActivity : AppCompatActivity() {
         val year = Calendar.getInstance().get(Calendar.YEAR)
         about_copyright.text = String.format(getString(R.string.copyright), versionName, year)
     }
+
+    private fun setupRateUs() {
+        if (preferences().isFirstRun) {
+            about_rate_us.visibility = View.GONE
+        }
+
+        about_rate_us.setOnClickListener {
+            startActivity(Intent(Intent.ACTION_VIEW, Uri.parse(getRateUsUrl())))
+        }
+    }
+
+    private fun setupSocial() {
+        about_facebook.setOnClickListener {
+            startActivity(Intent(Intent.ACTION_VIEW, Uri.parse(getFacebookUrl())))
+        }
+
+        about_gplus.setOnClickListener {
+            val link = "https://plus.google.com/communities/104880861558693868382"
+            startActivity(Intent(Intent.ACTION_VIEW, Uri.parse(link)))
+        }
+    }
+
+    private fun getFacebookUrl(): String {
+        try {
+            packageManager.getPackageInfo("com.facebook.katana", 0)
+            return "fb://page/150270895341774"
+        } catch (ignored: Exception) {
+            return "https://www.facebook.com/simplemobiletools"
+        }
+    }
+
+    private fun getRateUsUrl(): String {
+        try {
+            return "market://details?id=" + packageName
+        } catch (ignored: ActivityNotFoundException) {
+            return "http://play.google.com/store/apps/details?id=" + packageName
+        }
+    }
 }

app/src/main/kotlin/com/simplemobiletools/applauncher/activities/MainActivity.kt

@@ -6,6 +6,8 @@ import android.support.v7.app.AppCompatActivity
 import android.view.Menu
 import android.view.MenuItem
 import com.simplemobiletools.applauncher.R
+import com.simplemobiletools.applauncher.extensions.isFirstRun
+import com.simplemobiletools.applauncher.extensions.preferences
 
 class MainActivity : AppCompatActivity() {
 
@@ -28,4 +30,9 @@ class MainActivity : AppCompatActivity() {
         }
         return super.onOptionsItemSelected(item)
     }
+
+    override fun onDestroy() {
+        super.onDestroy()
+        preferences().isFirstRun(false)
+    }
 }

app/src/main/kotlin/com/simplemobiletools/applauncher/extensions/preferences.kt

@@ -0,0 +1,21 @@
+package com.simplemobiletools.applauncher.extensions
+
+import android.content.Context
+import android.content.SharedPreferences
+
+val PREFS_KEY = "App Launcher"
+val IS_FIRST_RUN = "is_first_run"
+
+private val defaultInit: Any.() -> Unit = {}
+
+fun Context.preferences(init: SharedPreferences.() -> Unit = defaultInit): SharedPreferences {
+    val defaultPreferences = getSharedPreferences(PREFS_KEY, Context.MODE_PRIVATE)
+    defaultPreferences.init()
+    return defaultPreferences
+}
+
+val SharedPreferences.isFirstRun: Boolean get() = getBoolean(IS_FIRST_RUN, true)
+
+fun SharedPreferences.isFirstRun(isFirstRun: Boolean) {
+    edit().putBoolean(IS_FIRST_RUN, isFirstRun).apply()
+}