convert 3 simple activity to kotlin

app/src/main/kotlin/com/simplemobiletools/filemanager/activities/LicenseActivity.kt

@@ -0,0 +1,22 @@
+package com.simplemobiletools.filemanager.activities
+
+import android.content.Intent
+import android.net.Uri
+import android.os.Bundle
+import com.simplemobiletools.filemanager.R
+import kotlinx.android.synthetic.main.activity_license.*
+
+class LicenseActivity : SimpleActivity() {
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_license)
+        license_butterknife_title.setOnClickListener { openUrl(R.string.butterknife_url) }
+    }
+
+    private fun openUrl(id: Int) {
+        val url = resources.getString(id)
+        val browserIntent = Intent(Intent.ACTION_VIEW, Uri.parse(url))
+        startActivity(browserIntent)
+    }
+}

app/src/main/kotlin/com/simplemobiletools/filemanager/activities/SettingsActivity.kt

@@ -0,0 +1,37 @@
+package com.simplemobiletools.filemanager.activities
+
+import android.os.Bundle
+import android.support.v4.app.TaskStackBuilder
+import com.simplemobiletools.filemanager.R
+import kotlinx.android.synthetic.main.activity_settings.*
+
+class SettingsActivity : SimpleActivity() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_settings)
+
+        setupDarkTheme()
+        setupShowHidden()
+    }
+
+    private fun setupDarkTheme() {
+        settings_dark_theme.isChecked = mConfig.isDarkTheme
+        settings_dark_theme_holder.setOnClickListener {
+            settings_dark_theme.toggle()
+            mConfig.isDarkTheme = settings_dark_theme.isChecked
+            restartActivity()
+        }
+    }
+
+    private fun setupShowHidden() {
+        settings_show_hidden.isChecked = mConfig.showHidden
+        settings_show_hidden_holder.setOnClickListener {
+            settings_show_hidden.toggle()
+            mConfig.showHidden = settings_show_hidden.isChecked
+        }
+    }
+
+    private fun restartActivity() {
+        TaskStackBuilder.create(applicationContext).addNextIntentWithParentStack(intent).startActivities()
+    }
+}

app/src/main/kotlin/com/simplemobiletools/filemanager/activities/SimpleActivity.kt

@@ -0,0 +1,28 @@
+package com.simplemobiletools.filemanager.activities
+
+import android.os.Bundle
+import android.support.v7.app.AppCompatActivity
+import android.view.MenuItem
+
+import com.simplemobiletools.filemanager.Config
+import com.simplemobiletools.filemanager.R
+
+open class SimpleActivity : AppCompatActivity() {
+    lateinit var mConfig: Config
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        mConfig = Config.newInstance(applicationContext)
+        setTheme(if (mConfig.isDarkTheme) R.style.AppTheme_Dark else R.style.AppTheme)
+        super.onCreate(savedInstanceState)
+    }
+
+    override fun onOptionsItemSelected(item: MenuItem): Boolean {
+        return when (item.itemId) {
+            android.R.id.home -> {
+                finish()
+                true
+            }
+            else -> super.onOptionsItemSelected(item)
+        }
+    }
+}