Use AlertDialogs in support lib

src/main/scala/com/github/shadowsocks/ParserActivity.scala

@@ -39,15 +39,15 @@
 
 package com.github.shadowsocks
 
-import android.app.{Activity, AlertDialog}
 import android.content.DialogInterface
 import android.graphics.Color
 import android.graphics.drawable.ColorDrawable
 import android.os.Bundle
+import android.support.v7.app.{AppCompatActivity, AlertDialog}
 import android.view.WindowManager
 import com.github.shadowsocks.utils.Parser
 
-class ParserActivity extends Activity {
+class ParserActivity extends AppCompatActivity {
   override def onCreate(savedInstanceState: Bundle) {
     super.onCreate(savedInstanceState)
     val data = getIntent.getData.toString
@@ -56,30 +56,27 @@ class ParserActivity extends Activity {
       finish()
       return
     }
-    showAsPopup(this)
+    showAsPopup()
     val dialog = new AlertDialog.Builder(this)
       .setTitle(R.string.add_profile_dialog)
       .setCancelable(false)
       .setPositiveButton(android.R.string.yes, ((dialog: DialogInterface, id: Int) => {
         ShadowsocksApplication.profileManager.createProfile(profile.get)
-        dialog.dismiss()
-      }): DialogInterface.OnClickListener)
-      .setNegativeButton(android.R.string.no, ((dialog: DialogInterface, id: Int) => {
-        dialog.dismiss()
       }): DialogInterface.OnClickListener)
+      .setNegativeButton(android.R.string.no, null)
       .setMessage(data)
       .create()
     dialog.setOnDismissListener((dialog: DialogInterface) => finish())  // builder method was added in API 17
     dialog.show()
   }
 
-  def showAsPopup(activity: Activity) {
-    activity.getWindow.setFlags(WindowManager.LayoutParams.FLAG_DIM_BEHIND,
-      WindowManager.LayoutParams.FLAG_DIM_BEHIND)
-    val params = activity.getWindow.getAttributes
+  def showAsPopup() {
+    val window = getWindow
+    window.setFlags(WindowManager.LayoutParams.FLAG_DIM_BEHIND, WindowManager.LayoutParams.FLAG_DIM_BEHIND)
+    val params = window.getAttributes
     params.alpha = 1.0f
     params.dimAmount = 0.5f
-    activity.getWindow.setAttributes(params.asInstanceOf[android.view.WindowManager.LayoutParams])
-    activity.getWindow.setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT))
+    window.setAttributes(params.asInstanceOf[android.view.WindowManager.LayoutParams])
+    window.setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT))
   }
 }

src/main/scala/com/github/shadowsocks/ProfileManagerActivity.scala

@@ -1,22 +1,21 @@
 package com.github.shadowsocks
 
-import android.app.AlertDialog
-import android.content.{DialogInterface, Intent}
+import android.content.Intent
 import android.os.Bundle
 import android.support.design.widget.Snackbar
-import android.support.v7.app.AppCompatActivity
+import android.support.v7.app.{AlertDialog, AppCompatActivity}
 import android.support.v7.widget.RecyclerView.ViewHolder
 import android.support.v7.widget.Toolbar.OnMenuItemClickListener
 import android.support.v7.widget.helper.ItemTouchHelper
 import android.support.v7.widget.helper.ItemTouchHelper.SimpleCallback
 import android.support.v7.widget.{DefaultItemAnimator, LinearLayoutManager, RecyclerView, Toolbar}
 import android.text.style.TextAppearanceSpan
-import android.text.{Spanned, SpannableStringBuilder}
+import android.text.{SpannableStringBuilder, Spanned}
 import android.view.View.{OnAttachStateChangeListener, OnClickListener}
 import android.view.{LayoutInflater, MenuItem, View, ViewGroup}
-import android.widget.{LinearLayout, ImageView, CheckedTextView, Toast}
+import android.widget.{CheckedTextView, ImageView, LinearLayout, Toast}
 import com.github.shadowsocks.database.Profile
-import com.github.shadowsocks.utils.{TrafficMonitor, Parser, Utils}
+import com.github.shadowsocks.utils.{Parser, TrafficMonitor, Utils}
 import com.google.zxing.integration.android.IntentIntegrator
 import net.glxn.qrgen.android.QRCode
 
@@ -38,13 +37,12 @@ class ProfileManagerActivity extends AppCompatActivity with OnMenuItemClickListe
         image.setLayoutParams(new LinearLayout.LayoutParams(-1, -1))
         val qrcode = QRCode.from(Parser.generate(item))
           .withSize(Utils.dpToPx(ProfileManagerActivity.this, 250), Utils.dpToPx(ProfileManagerActivity.this, 250))
-          .asInstanceOf[QRCode]
-        image.setImageBitmap(qrcode.bitmap())
+          .asInstanceOf[QRCode].bitmap()
+        image.setImageBitmap(qrcode)
 
         new AlertDialog.Builder(ProfileManagerActivity.this)
           .setCancelable(true)
-          .setNegativeButton(getString(R.string.close),
-            ((dialog: DialogInterface, id: Int) => dialog.cancel()): DialogInterface.OnClickListener)
+          .setNegativeButton(R.string.close, null)
           .setView(image)
           .create()
           .show()

src/main/scala/com/github/shadowsocks/ShadowsocksSettings.scala

@@ -2,11 +2,11 @@ package com.github.shadowsocks
 
 import java.util.Locale
 
-import android.app.AlertDialog
 import android.content.{DialogInterface, Intent}
 import android.net.Uri
 import android.os.{Build, Bundle}
 import android.preference.{SwitchPreference, Preference, PreferenceFragment}
+import android.support.v7.app.AlertDialog
 import android.webkit.{WebViewClient, WebView}
 import com.github.shadowsocks.utils.Key