This commit seems to be able to speed up AppManager on second launch noticeably.

P.S. Android 6.0, 200+ apps installed.

build.sbt

@@ -35,7 +35,6 @@ libraryDependencies ++= Seq(
   "com.google.android.gms" % "play-services-analytics" % "8.1.0",
   "com.android.support" % "design" % "23.1.0",
   "com.github.jorgecastilloprz" % "fabprogresscircle" % "1.01",
-  "com.nostra13.universalimageloader" % "universal-image-loader" % "1.9.4",
   "com.j256.ormlite" % "ormlite-core" % "4.48",
   "com.j256.ormlite" % "ormlite-android" % "4.48"
 )

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

@@ -39,11 +39,10 @@
 
 package com.github.shadowsocks
 
-import java.io.{ByteArrayInputStream, ByteArrayOutputStream, InputStream}
-
 import android.content.pm.PackageManager
 import android.content.{ClipData, ClipboardManager, Context, SharedPreferences}
-import android.graphics.{Bitmap, PixelFormat}
+import android.graphics.PixelFormat
+import android.graphics.drawable.Drawable
 import android.os.{Bundle, Handler}
 import android.preference.PreferenceManager
 import android.support.v7.app.AppCompatActivity
@@ -55,16 +54,13 @@ import android.view.{MenuItem, View, ViewGroup, WindowManager}
 import android.widget.AbsListView.OnScrollListener
 import android.widget.CompoundButton.OnCheckedChangeListener
 import android.widget._
-import com.github.shadowsocks.utils.{Key, Scheme, Utils}
-import com.nostra13.universalimageloader.core.display.FadeInBitmapDisplayer
-import com.nostra13.universalimageloader.core.download.BaseImageDownloader
-import com.nostra13.universalimageloader.core.{DisplayImageOptions, ImageLoader, ImageLoaderConfiguration}
+import com.github.shadowsocks.utils.{Key, Utils}
 
 import scala.concurrent.ExecutionContext.Implicits.global
 import scala.concurrent.Future
 import scala.language.implicitConversions
 
-case class ProxiedApp(uid: Int, name: String, packageName: String, var proxied: Boolean)
+case class ProxiedApp(uid: Int, name: String, packageName: String, icon: Drawable, var proxied: Boolean)
 
 class ObjectArrayTools[T <: AnyRef](a: Array[T]) {
   def binarySearch(key: T) = {
@@ -94,7 +90,7 @@ object AppManager {
         val name = packageManager.getApplicationLabel(a).toString
         val packageName = a.packageName
         val proxied = proxiedApps.binarySearch(userName) >= 0
-        new ProxiedApp(uid, name, packageName, proxied)
+        new ProxiedApp(uid, name, packageName, null, proxied)
     }.toArray
   }
 }
@@ -132,7 +128,7 @@ class AppManager extends AppCompatActivity with OnCheckedChangeListener with OnC
         val name = packageManager.getApplicationLabel(a).toString
         val packageName = a.packageName
         val proxied = (proxiedApps binarySearch userName) >= 0
-        new ProxiedApp(uid, name, packageName, proxied)
+        new ProxiedApp(uid, name, packageName, a.loadIcon(packageManager), proxied)
     }.toArray
   }
 
@@ -167,19 +163,9 @@ class AppManager extends AppCompatActivity with OnCheckedChangeListener with OnC
         }
 
         val app: ProxiedApp = apps(position)
-        val options =
-          new DisplayImageOptions.Builder()
-            .showStubImage(STUB)
-            .showImageForEmptyUri(STUB)
-            .showImageOnFail(STUB)
-            .resetViewBeforeLoading()
-            .cacheInMemory()
-            .cacheOnDisc()
-            .displayer(new FadeInBitmapDisplayer(300))
-            .build()
-        ImageLoader.getInstance().displayImage(Scheme.APP + app.packageName, entry.icon, options)
 
         entry.text.setText(app.name)
+        entry.icon.setImageDrawable(app.icon)
         val switch = entry.switch
         switch.setTag(app)
         switch.setChecked(app.proxied)
@@ -281,12 +267,6 @@ class AppManager extends AppCompatActivity with OnCheckedChangeListener with OnC
           WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE |
             WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE, PixelFormat.TRANSLUCENT))
 
-    val config =
-      new ImageLoaderConfiguration.Builder(this)
-        .imageDownloader(new AppIconDownloader(this))
-        .build()
-    ImageLoader.getInstance().init(config)
-
     val bypassSwitch = findViewById(R.id.bypassSwitch).asInstanceOf[Switch]
     bypassSwitch.setOnCheckedChangeListener((button: CompoundButton, checked: Boolean) =>
       ShadowsocksApplication.settings.edit().putBoolean(Key.isBypassApps, checked).apply())
@@ -342,22 +322,4 @@ class AppManager extends AppCompatActivity with OnCheckedChangeListener with OnC
 
   var handler: Handler = null
 
-  class AppIconDownloader(context: Context, connectTimeout: Int, readTimeout: Int)
-    extends BaseImageDownloader(context, connectTimeout, readTimeout) {
-
-    def this(context: Context) {
-      this(context, 0, 0)
-    }
-
-    override def getStreamFromOtherSource(imageUri: String, extra: AnyRef): InputStream = {
-      val packageName = imageUri.substring(Scheme.APP.length)
-      val drawable = Utils.getAppIcon(getBaseContext, packageName)
-      val bitmap = Utils.drawableToBitmap(drawable)
-
-      val os = new ByteArrayOutputStream()
-      bitmap.compress(Bitmap.CompressFormat.PNG, 100, os)
-      new ByteArrayInputStream(os.toByteArray)
-    }
-  }
-
 }

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

@@ -38,7 +38,7 @@
  */
 package com.github.shadowsocks
 
-import java.io.{ByteArrayInputStream, ByteArrayOutputStream, FileOutputStream, IOException, InputStream, OutputStream}
+import java.io.{FileOutputStream, IOException, InputStream, OutputStream}
 import java.util
 import java.util.Locale
 
@@ -46,7 +46,7 @@ import android.app.backup.BackupManager
 import android.app.{Activity, AlertDialog, ProgressDialog}
 import android.content._
 import android.content.res.AssetManager
-import android.graphics.{Bitmap, Color, Typeface}
+import android.graphics.Typeface
 import android.net.{Uri, VpnService}
 import android.os._
 import android.preference.{Preference, SwitchPreference}
@@ -64,33 +64,11 @@ import com.github.shadowsocks.database._
 import com.github.shadowsocks.preferences.{DropDownPreference, PasswordEditTextPreference, SummaryEditTextPreference}
 import com.github.shadowsocks.utils._
 import com.google.android.gms.ads.{AdRequest, AdSize, AdView}
-import com.nostra13.universalimageloader.core.download.BaseImageDownloader
 
 import scala.collection.mutable.ArrayBuffer
 import scala.concurrent.ExecutionContext.Implicits.global
 import scala.concurrent.Future
 
-class ProfileIconDownloader(context: Context, connectTimeout: Int, readTimeout: Int)
-  extends BaseImageDownloader(context, connectTimeout, readTimeout) {
-
-  def this(context: Context) {
-    this(context, 0, 0)
-  }
-
-  override def getStreamFromOtherSource(imageUri: String, extra: AnyRef): InputStream = {
-    val text = imageUri.substring(Scheme.PROFILE.length)
-    val size = Utils.dpToPx(context, 16)
-    val idx = text.getBytes.last % 6
-    val color = Seq(Color.MAGENTA, Color.GREEN, Color.YELLOW, Color.BLUE, Color.DKGRAY, Color.CYAN)(
-      idx)
-    val bitmap = Utils.getBitmap(text, size, size, color)
-
-    val os = new ByteArrayOutputStream()
-    bitmap.compress(Bitmap.CompressFormat.PNG, 100, os)
-    new ByteArrayInputStream(os.toByteArray)
-  }
-}
-
 object Typefaces {
   def get(c: Context, assetPath: String): Typeface = {
     cache synchronized {