add AboutActivity content

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

@@ -1,9 +1,100 @@
 package com.simplemobiletools.thankyou.activities
 
+import android.content.ActivityNotFoundException
+import android.content.Intent
+import android.net.Uri
 import android.os.Bundle
+import android.text.Html
+import android.text.method.LinkMovementMethod
+import android.view.View
+import com.simplemobiletools.thankyou.BuildConfig
+import com.simplemobiletools.thankyou.R
+import kotlinx.android.synthetic.main.activity_about.*
+import java.util.*
 
 class AboutActivity : SimpleActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_about)
+
+        setupEmail()
+        setupCopyright()
+        setupRateUs()
+        setupInvite()
+        setupLicense()
+        setupFacebook()
+        setupGPlus()
     }
+
+    private fun setupEmail() {
+        val email = getString(R.string.email)
+        val appName = getString(R.string.app_name)
+        val href = "<a href=\"mailto:$email?subject=$appName\">$email</a>"
+        about_email.text = Html.fromHtml(href)
+        about_email.movementMethod = LinkMovementMethod.getInstance()
+    }
+
+    private fun setupCopyright() {
+        val versionName = BuildConfig.VERSION_NAME
+        val year = Calendar.getInstance().get(Calendar.YEAR)
+        val copyrightText = String.format(getString(R.string.copyright), versionName, year)
+        about_copyright.text = copyrightText
+    }
+
+    private fun setupRateUs() {
+        if (mConfig.isFirstRun) {
+            about_rate_us.visibility = View.GONE
+        } else {
+            about_rate_us.setOnClickListener {
+                val uri = Uri.parse("market://details?id=$packageName")
+                try {
+                    startActivity(Intent(Intent.ACTION_VIEW, uri))
+                } catch (ignored: ActivityNotFoundException) {
+                    startActivity(Intent(Intent.ACTION_VIEW, Uri.parse(getStoreUrl())))
+                }
+            }
+        }
+    }
+
+    fun setupInvite() {
+        about_invite.setOnClickListener {
+            val text = String.format(getString(R.string.share_text), getString(R.string.app_name), getStoreUrl())
+            Intent().apply {
+                action = Intent.ACTION_SEND
+                putExtra(Intent.EXTRA_SUBJECT, getString(R.string.app_name))
+                putExtra(Intent.EXTRA_TEXT, text)
+                type = "text/plain"
+                startActivity(Intent.createChooser(this, getString(R.string.invite_via)))
+            }
+        }
+    }
+
+    fun setupLicense() {
+        about_license.setOnClickListener {
+            val intent = Intent(applicationContext, LicenseActivity::class.java)
+            startActivity(intent)
+        }
+    }
+
+    fun setupFacebook() {
+        about_facebook.setOnClickListener {
+            var link = "https://www.facebook.com/simplemobiletools"
+            try {
+                packageManager.getPackageInfo("com.facebook.katana", 0)
+                link = "fb://page/150270895341774"
+            } catch (ignored: Exception) {
+            }
+
+            startActivity(Intent(Intent.ACTION_VIEW, Uri.parse(link)))
+        }
+    }
+
+    fun setupGPlus() {
+        about_gplus.setOnClickListener {
+            val link = "https://plus.google.com/communities/104880861558693868382"
+            startActivity(Intent(Intent.ACTION_VIEW, Uri.parse(link)))
+        }
+    }
+
+    private fun getStoreUrl() = "https://play.google.com/store/apps/details?id=$packageName"
 }