diff --git a/app/build.gradle b/app/build.gradle
index 8cda90a..701e04d 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -55,6 +55,7 @@ dependencies {
     compile "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"
     testCompile 'junit:junit:4.12'
     compile 'com.android.support.constraint:constraint-layout:1.0.2'
+    compile 'org.greenrobot:eventbus:3.0.0'
     compile project(':chrome-tabs')
     implementation 'com.android.support:design:25.3.1'
 }
diff --git a/app/src/main/assets/install-oh-my-zsh.sh b/app/src/main/assets/install-zsh.sh
similarity index 100%
rename from app/src/main/assets/install-oh-my-zsh.sh
rename to app/src/main/assets/install-zsh.sh
diff --git a/app/src/main/java/io/neoterm/customize/NeoTermPath.kt b/app/src/main/java/io/neoterm/customize/NeoTermPath.kt
index a74bf4d..61f7f4d 100644
--- a/app/src/main/java/io/neoterm/customize/NeoTermPath.kt
+++ b/app/src/main/java/io/neoterm/customize/NeoTermPath.kt
@@ -8,12 +8,15 @@ import android.annotation.SuppressLint
 object NeoTermPath {
     @SuppressLint("SdCardPath")
     const val ROOT_PATH = "/data/data/io.neoterm/files"
-    const val USR_PATH =  "$ROOT_PATH/usr"
+    const val USR_PATH = "$ROOT_PATH/usr"
     const val HOME_PATH = "$ROOT_PATH/home"
 
     const val EKS_PATH = "$USR_PATH/share/eks"
     const val EKS_DEFAULT_FILE = "$EKS_PATH/default.eks"
 
-    const val SERVER_BASE_URL = "http://mirror.neoterm.studio"
+    const val SOURCE_FILE = "$USR_PATH/etc/apt/sources.list"
+
+    const val DEFAULT_SOURCE = "http://mirror.neoterm.studio"
+    const val SERVER_BASE_URL = DEFAULT_SOURCE
     const val SERVER_BOOT_URL = "$SERVER_BASE_URL/boot"
 }
\ No newline at end of file
diff --git a/app/src/main/java/io/neoterm/customize/shortcut/ShortcutConfigLoader.kt b/app/src/main/java/io/neoterm/customize/shortcut/ShortcutConfigLoader.kt
index 593ca64..8b3eddb 100644
--- a/app/src/main/java/io/neoterm/customize/shortcut/ShortcutConfigLoader.kt
+++ b/app/src/main/java/io/neoterm/customize/shortcut/ShortcutConfigLoader.kt
@@ -15,7 +15,7 @@ object ShortcutConfigLoader {
                 extraKeysView.loadDefaultUserDefinedExtraKeys()
             }
             for (button in config.shortcutKeys) {
-                extraKeysView.addExternalButton(button)
+                extraKeysView.addUserDefinedButton(button)
             }
         }
     }
diff --git a/app/src/main/java/io/neoterm/installer/BaseFileInstaller.java b/app/src/main/java/io/neoterm/installer/BaseFileInstaller.java
index 8d019f1..4e27548 100644
--- a/app/src/main/java/io/neoterm/installer/BaseFileInstaller.java
+++ b/app/src/main/java/io/neoterm/installer/BaseFileInstaller.java
@@ -2,6 +2,7 @@ package io.neoterm.installer;
 
 import android.app.Activity;
 import android.app.ProgressDialog;
+import android.content.Context;
 import android.os.Build;
 import android.system.Os;
 import android.util.Log;
@@ -10,7 +11,9 @@ import android.util.Pair;
 import java.io.BufferedReader;
 import java.io.File;
 import java.io.FileOutputStream;
+import java.io.InputStream;
 import java.io.InputStreamReader;
+import java.net.HttpURLConnection;
 import java.net.MalformedURLException;
 import java.net.URL;
 import java.util.ArrayList;
@@ -22,6 +25,7 @@ import java.util.zip.ZipInputStream;
 import io.neoterm.R;
 import io.neoterm.backend.EmulatorDebug;
 import io.neoterm.customize.NeoTermPath;
+import io.neoterm.utils.FileUtils;
 
 public final class BaseFileInstaller {
     public interface ResultListener {
@@ -35,7 +39,11 @@ public final class BaseFileInstaller {
             return;
         }
 
-        final ProgressDialog progress = ProgressDialog.show(activity, null, activity.getString(R.string.installer_message), true, false);
+        installHomeFiles(activity);
+
+        final ProgressDialog progress = makeProgressDialog(activity);
+        progress.setMax(100);
+        progress.show();
         new Thread() {
             @Override
             public void run() {
@@ -47,13 +55,37 @@ public final class BaseFileInstaller {
                         deleteFolder(STAGING_PREFIX_FILE);
                     }
 
+                    int totalBytes = 0;
+                    int totalReadBytes = 0;
                     final byte[] buffer = new byte[8096];
                     final List<Pair<String, String>> symlinks = new ArrayList<>(50);
 
                     final URL zipUrl = determineZipUrl();
-                    try (ZipInputStream zipInput = new ZipInputStream(zipUrl.openStream())) {
+                    HttpURLConnection connection = (HttpURLConnection) zipUrl.openConnection();
+                    totalBytes = connection.getContentLength();
+
+                    try (ZipInputStream zipInput = new ZipInputStream(connection.getInputStream())) {
                         ZipEntry zipEntry;
+
                         while ((zipEntry = zipInput.getNextEntry()) != null) {
+                            totalReadBytes += zipEntry.getCompressedSize();
+
+                            final int totalReadBytesFinal = totalReadBytes;
+                            final int totalBytesFinal = totalBytes;
+
+                            activity.runOnUiThread(new Runnable() {
+                                @Override
+                                public void run() {
+                                    try {
+                                        double progressFloat = ((double) totalReadBytesFinal) / ((double) totalBytesFinal) * 100.0;
+                                        Log.e("NeoTerm-Installer", "total: " + totalBytesFinal + ", read: " + totalReadBytesFinal + ", " + progressFloat);
+                                        progress.setProgress((int) progressFloat);
+                                    } catch (RuntimeException ignore) {
+                                        // activity dismissed
+                                    }
+                                }
+                            });
+
                             if (zipEntry.getName().equals("SYMLINKS.txt")) {
                                 BufferedReader symlinksReader = new BufferedReader(new InputStreamReader(zipInput));
                                 String line;
@@ -77,8 +109,9 @@ public final class BaseFileInstaller {
                                 } else {
                                     try (FileOutputStream outStream = new FileOutputStream(targetFile)) {
                                         int readBytes;
-                                        while ((readBytes = zipInput.read(buffer)) != -1)
+                                        while ((readBytes = zipInput.read(buffer)) != -1) {
                                             outStream.write(buffer, 0, readBytes);
+                                        }
                                     }
                                     if (zipEntryName.startsWith("bin/") || zipEntryName.startsWith("libexec") || zipEntryName.startsWith("lib/apt/methods")) {
                                         //noinspection OctalInteger
@@ -89,6 +122,8 @@ public final class BaseFileInstaller {
                         }
                     }
 
+                    connection.disconnect();
+
                     if (symlinks.isEmpty())
                         throw new RuntimeException("No SYMLINKS.txt encountered");
                     for (Pair<String, String> symlink : symlinks) {
@@ -133,6 +168,26 @@ public final class BaseFileInstaller {
         }.start();
     }
 
+    private static void installHomeFiles(final Activity activity) {
+        File HOME_PATH = new File(NeoTermPath.HOME_PATH);
+        File ZSH_INSTALLER = new File(HOME_PATH, "install-zsh.sh");
+
+        if (!HOME_PATH.exists()) {
+            HOME_PATH.mkdirs();
+        }
+
+        if (!ZSH_INSTALLER.exists()) {
+            try {
+                InputStream inputStream = activity.getAssets().open("install-zsh.sh");
+                FileUtils.INSTANCE.writeFile(ZSH_INSTALLER, inputStream);
+                inputStream.close();
+
+                Os.chmod(ZSH_INSTALLER.getAbsolutePath(), 0700);
+            } catch (Exception ignore) {
+            }
+        }
+    }
+
     private static URL determineZipUrl() throws MalformedURLException {
         String archName = determineArchName();
         return new URL(NeoTermPath.SERVER_BOOT_URL + "/" + archName + ".zip");
@@ -166,4 +221,13 @@ public final class BaseFileInstaller {
             throw new RuntimeException("Unable to delete " + (fileOrDirectory.isDirectory() ? "directory " : "file ") + fileOrDirectory.getAbsolutePath());
         }
     }
+
+    public static ProgressDialog makeProgressDialog(Context context) {
+        ProgressDialog dialog = new ProgressDialog(context);
+        dialog.setMessage(context.getString(R.string.installer_message));
+        dialog.setIndeterminate(false);
+        dialog.setCancelable(false);
+        dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
+        return dialog;
+    }
 }
diff --git a/app/src/main/java/io/neoterm/preference/NeoTermPreference.kt b/app/src/main/java/io/neoterm/preference/NeoPreference.kt
similarity index 87%
rename from app/src/main/java/io/neoterm/preference/NeoTermPreference.kt
rename to app/src/main/java/io/neoterm/preference/NeoPreference.kt
index 3f693b8..a0234e1 100644
--- a/app/src/main/java/io/neoterm/preference/NeoTermPreference.kt
+++ b/app/src/main/java/io/neoterm/preference/NeoPreference.kt
@@ -3,9 +3,11 @@ package io.neoterm.preference
 import android.content.Context
 import android.content.SharedPreferences
 import android.preference.PreferenceManager
+import io.neoterm.R
 import io.neoterm.backend.TerminalSession
 import io.neoterm.customize.NeoTermPath
 import io.neoterm.services.NeoTermService
+import io.neoterm.utils.FileUtils
 import java.io.File
 
 
@@ -13,7 +15,7 @@ import java.io.File
  * @author kiva
  */
 
-object NeoTermPreference {
+object NeoPreference {
     const val KEY_FONT_SIZE = "neoterm_general_font_size"
     const val KEY_CURRENT_SESSION = "neoterm_service_current_session"
 
@@ -23,6 +25,17 @@ object NeoTermPreference {
     fun init(context: Context) {
         this.context = context
         preference = PreferenceManager.getDefaultSharedPreferences(context)
+
+        // load apt source
+        val sourceFile = File(NeoTermPath.SOURCE_FILE)
+        val bytes = FileUtils.readFile(sourceFile)
+        if (bytes != null) {
+            val source = String(FileUtils.readFile(sourceFile)!!).trim().trimEnd()
+            val array = source.split(" ")
+            if (array.size >= 2 && array[0] == "deb") {
+                store(R.string.key_package_source, array[1])
+            }
+        }
     }
 
     fun cleanup() {
@@ -68,7 +81,7 @@ object NeoTermPreference {
 
     fun storeCurrentSession(session: TerminalSession) {
         preference!!.edit()
-                .putString(NeoTermPreference.KEY_CURRENT_SESSION, session.mHandle)
+                .putString(NeoPreference.KEY_CURRENT_SESSION, session.mHandle)
                 .apply()
     }
 
diff --git a/app/src/main/java/io/neoterm/services/NeoTermService.kt b/app/src/main/java/io/neoterm/services/NeoTermService.kt
index b4f3d9d..3e68921 100644
--- a/app/src/main/java/io/neoterm/services/NeoTermService.kt
+++ b/app/src/main/java/io/neoterm/services/NeoTermService.kt
@@ -15,7 +15,7 @@ import io.neoterm.R
 import io.neoterm.backend.EmulatorDebug
 import io.neoterm.backend.TerminalSession
 import io.neoterm.customize.NeoTermPath
-import io.neoterm.preference.NeoTermPreference
+import io.neoterm.preference.NeoPreference
 import io.neoterm.ui.NeoTermActivity
 import java.io.File
 import java.util.*
@@ -83,7 +83,7 @@ class NeoTermService : Service() {
             executablePath = if (systemShell)
                 "/system/bin/sh"
             else
-                NeoTermPath.USR_PATH + "/bin/" + NeoTermPreference.loadString(R.string.key_general_shell, "sh")
+                NeoTermPath.USR_PATH + "/bin/" + NeoPreference.loadString(R.string.key_general_shell, "sh")
 
             if (!File(executablePath).exists()) {
                 Toast.makeText(this, getString(R.string.shell_not_found, executablePath), Toast.LENGTH_LONG).show()
@@ -96,7 +96,7 @@ class NeoTermService : Service() {
         }
 
         val session = TerminalSession(executablePath, cwd, arguments,
-                env ?: NeoTermPreference.buildEnvironment(cwd, systemShell, executablePath),
+                env ?: NeoPreference.buildEnvironment(cwd, systemShell, executablePath),
                 sessionCallback)
         mTerminalSessions.add(session)
         updateNotification()
diff --git a/app/src/main/java/io/neoterm/ui/NeoTermActivity.kt b/app/src/main/java/io/neoterm/ui/NeoTermActivity.kt
index 5a01bd8..66c30b1 100644
--- a/app/src/main/java/io/neoterm/ui/NeoTermActivity.kt
+++ b/app/src/main/java/io/neoterm/ui/NeoTermActivity.kt
@@ -16,7 +16,6 @@ import android.view.View
 import android.view.WindowManager
 import android.view.inputmethod.InputMethodManager
 import android.widget.ImageButton
-import android.widget.Toast
 import de.mrapp.android.tabswitcher.*
 import io.neoterm.R
 import io.neoterm.backend.TerminalSession
@@ -25,15 +24,20 @@ import io.neoterm.customize.shortcut.ShortcutConfigLoader
 import io.neoterm.customize.shortcut.builtin.BuiltinShortcutKeys
 import io.neoterm.installer.BaseFileInstaller
 import io.neoterm.preference.NeoPermission
-import io.neoterm.preference.NeoTermPreference
+import io.neoterm.preference.NeoPreference
 import io.neoterm.services.NeoTermService
 import io.neoterm.ui.settings.SettingActivity
-import io.neoterm.utils.NeoTermFullScreen
+import io.neoterm.utils.FullScreenHelper
+import io.neoterm.view.eks.StatedControlButton
 import io.neoterm.view.tab.*
+import org.greenrobot.eventbus.EventBus
+import org.greenrobot.eventbus.Subscribe
+import org.greenrobot.eventbus.ThreadMode
 
 
 class NeoTermActivity : AppCompatActivity(), ServiceConnection, SharedPreferences.OnSharedPreferenceChangeListener {
     lateinit var tabSwitcher: TabSwitcher
+    lateinit var fullScreenToggleButton: StatedControlButton
     var systemShell = true
     var termService: NeoTermService? = null
     var restartRequired = false
@@ -43,16 +47,17 @@ class NeoTermActivity : AppCompatActivity(), ServiceConnection, SharedPreference
 
         NeoPermission.initAppPermission(this, NeoPermission.REQUEST_APP_PERMISSION)
         FontManager.init(this)
-        NeoTermPreference.init(this)
+        NeoPreference.init(this)
 
-        if (NeoTermPreference.loadBoolean(R.string.key_ui_fullscreen, false)) {
+        val fullscreen = NeoPreference.loadBoolean(R.string.key_ui_fullscreen, false)
+
+        if (fullscreen) {
             window.setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                     WindowManager.LayoutParams.FLAG_FULLSCREEN)
         }
 
         setContentView(R.layout.tab_main)
-
-        NeoTermFullScreen.injectActivity(this)
+        FullScreenHelper.injectActivity(this, peekRecreating())
                 .setKeyBoardListener({ isShow, _ ->
                     var tab: TermTab? = null
 
@@ -62,12 +67,24 @@ class NeoTermActivity : AppCompatActivity(), ServiceConnection, SharedPreference
 
                     tab?.viewClient?.extraKeysView?.visibility = if (isShow) View.VISIBLE else View.GONE
 
-                    if (NeoTermPreference.loadBoolean(R.string.key_ui_fullscreen, false)
-                            || NeoTermPreference.loadBoolean(R.string.key_ui_hide_toolbar, false)) {
+                    if (NeoPreference.loadBoolean(R.string.key_ui_fullscreen, false)
+                            || NeoPreference.loadBoolean(R.string.key_ui_hide_toolbar, false)) {
                         tab?.toolbar?.visibility = if (isShow) View.GONE else View.VISIBLE
                     }
                 })
 
+        fullScreenToggleButton = object : StatedControlButton("FS", fullscreen) {
+            override fun onClick(view: View?) {
+                super.onClick(view)
+                if (tabSwitcher.selectedTab is TermTab) {
+                    val tab = tabSwitcher.selectedTab as TermTab
+                    tab.hideIme()
+                }
+                NeoPreference.store(R.string.key_ui_fullscreen, super.toggleButton.isChecked)
+                this@NeoTermActivity.recreate()
+            }
+        }
+
         tabSwitcher = findViewById(R.id.tab_switcher) as TabSwitcher
         tabSwitcher.decorator = TermTabDecorator(this)
         ViewCompat.setOnApplyWindowInsetsListener(tabSwitcher, createWindowInsetsListener())
@@ -92,9 +109,8 @@ class NeoTermActivity : AppCompatActivity(), ServiceConnection, SharedPreference
         super.onResume()
         if (restartRequired) {
             restartRequired = false
-            this.recreate()
+            recreate()
         }
-
         PreferenceManager.getDefaultSharedPreferences(this)
                 .registerOnSharedPreferenceChangeListener(this)
         tabSwitcher.addListener(object : TabSwitcherListener {
@@ -123,7 +139,7 @@ class NeoTermActivity : AppCompatActivity(), ServiceConnection, SharedPreference
 
             override fun onSelectionChanged(tabSwitcher: TabSwitcher, selectedTabIndex: Int, selectedTab: Tab?) {
                 if (selectedTab is TermTab && selectedTab.termSession != null) {
-                    NeoTermPreference.storeCurrentSession(selectedTab.termSession!!)
+                    NeoPreference.storeCurrentSession(selectedTab.termSession!!)
                 }
             }
 
@@ -143,6 +159,16 @@ class NeoTermActivity : AppCompatActivity(), ServiceConnection, SharedPreference
         })
     }
 
+    override fun onStart() {
+        super.onStart()
+        EventBus.getDefault().register(this)
+    }
+
+    override fun onStop() {
+        super.onStop()
+        EventBus.getDefault().unregister(this)
+    }
+
     override fun onDestroy() {
         super.onDestroy()
         PreferenceManager.getDefaultSharedPreferences(this)
@@ -154,7 +180,7 @@ class NeoTermActivity : AppCompatActivity(), ServiceConnection, SharedPreference
             termService = null
         }
         unbindService(this)
-        NeoTermPreference.cleanup()
+        NeoPreference.cleanup()
     }
 
     override fun onKeyDown(keyCode: Int, event: KeyEvent?): Boolean {
@@ -185,6 +211,12 @@ class NeoTermActivity : AppCompatActivity(), ServiceConnection, SharedPreference
         }
     }
 
+    override fun onSharedPreferenceChanged(sharedPreferences: SharedPreferences?, key: String?) {
+        if (key == getString(R.string.key_ui_fullscreen)) {
+            restartRequired = true
+        }
+    }
+
     override fun onServiceDisconnected(name: ComponentName?) {
         if (termService != null) {
             finish()
@@ -227,14 +259,35 @@ class NeoTermActivity : AppCompatActivity(), ServiceConnection, SharedPreference
             }
         }
 
-        BaseFileInstaller.installBaseFiles(this, resultListener)
+        if (!isRecreating()) {
+            BaseFileInstaller.installBaseFiles(this, resultListener)
+        }
     }
 
-    override fun onSharedPreferenceChanged(sharedPreferences: SharedPreferences?, key: String?) {
-        if (key == getString(R.string.key_ui_fullscreen)) {
-            Toast.makeText(this, R.string.fullscreen_mode_changed, Toast.LENGTH_SHORT).show()
-            restartRequired = true
-        }
+    override fun onSaveInstanceState(outState: Bundle?) {
+        super.onSaveInstanceState(outState)
+        outState?.putBoolean("system_shell", systemShell)
+    }
+
+    override fun onRestoreInstanceState(savedInstanceState: Bundle?) {
+        super.onRestoreInstanceState(savedInstanceState)
+        systemShell = savedInstanceState?.getBoolean("system_shell", true) ?: true
+    }
+
+    override fun recreate() {
+        NeoPreference.store("recreate", true)
+        super.recreate()
+    }
+
+    private fun isRecreating(): Boolean {
+        val result = peekRecreating()
+        NeoPreference.store("recreate", !result)
+        return result
+    }
+
+    private fun peekRecreating(): Boolean {
+        val result = NeoPreference.loadBoolean("recreate", false)
+        return result
     }
 
     private fun addNewSession(session: TerminalSession?) {
@@ -299,7 +352,7 @@ class NeoTermActivity : AppCompatActivity(), ServiceConnection, SharedPreference
     }
 
     private fun getStoredCurrentSessionOrLast(): TerminalSession? {
-        val stored = NeoTermPreference.getCurrentSession(termService)
+        val stored = NeoPreference.getCurrentSession(termService)
         if (stored != null) return stored
         val numberOfSessions = termService!!.sessions.size
         if (numberOfSessions == 0) return null
@@ -340,24 +393,6 @@ class NeoTermActivity : AppCompatActivity(), ServiceConnection, SharedPreference
 
     private fun createTab(tabTitle: String?): Tab {
         val tab = TermTab(tabTitle ?: "NeoTerm")
-        tab.closeTabProvider = object : CloseTabProvider {
-            override fun closeTab(tab: Tab) {
-                tabSwitcher.showSwitcher()
-                tabSwitcher.removeTab(tab)
-
-                if (tabSwitcher.count > 1) {
-                    var index = tabSwitcher.indexOf(tab)
-                    if (NeoTermPreference.loadBoolean(R.string.key_ui_next_tab_anim, false)) {
-                        // 关闭当前窗口后，向下一个窗口切换
-                        if (--index < 0) index = tabSwitcher.count - 1
-                    } else {
-                        // 关闭当前窗口后，向上一个窗口切换
-                        if (++index >= tabSwitcher.count) index = 0
-                    }
-                    switchToSession(tabSwitcher.getTab(index))
-                }
-            }
-        }
         tab.isCloseable = true
         tab.parameters = Bundle()
         tab.setBackgroundColor(ContextCompat.getColor(this, R.color.tab_background_color))
@@ -408,4 +443,24 @@ class NeoTermActivity : AppCompatActivity(), ServiceConnection, SharedPreference
             insets
         }
     }
+
+    @Suppress("unused")
+    @Subscribe(threadMode = ThreadMode.MAIN)
+    fun onTabCloseEvent(tabCloseEvent: TabCloseEvent) {
+        val tab = tabCloseEvent.termTab
+        tabSwitcher.showSwitcher()
+        tabSwitcher.removeTab(tab)
+
+        if (tabSwitcher.count > 1) {
+            var index = tabSwitcher.indexOf(tab)
+            if (NeoPreference.loadBoolean(R.string.key_ui_next_tab_anim, false)) {
+                // 关闭当前窗口后，向下一个窗口切换
+                if (--index < 0) index = tabSwitcher.count - 1
+            } else {
+                // 关闭当前窗口后，向上一个窗口切换
+                if (++index >= tabSwitcher.count) index = 0
+            }
+            switchToSession(tabSwitcher.getTab(index))
+        }
+    }
 }
diff --git a/app/src/main/java/io/neoterm/ui/settings/PackageSettingsActivity.kt b/app/src/main/java/io/neoterm/ui/settings/PackageSettingsActivity.kt
index 87dccee..bf0b989 100644
--- a/app/src/main/java/io/neoterm/ui/settings/PackageSettingsActivity.kt
+++ b/app/src/main/java/io/neoterm/ui/settings/PackageSettingsActivity.kt
@@ -1,9 +1,14 @@
 package io.neoterm.ui.settings
 
 import android.os.Bundle
+import android.support.v7.app.AlertDialog
 import android.support.v7.app.AppCompatPreferenceActivity
 import android.view.MenuItem
 import io.neoterm.R
+import io.neoterm.customize.NeoTermPath
+import io.neoterm.preference.NeoPreference
+import io.neoterm.utils.FileUtils
+import java.io.File
 
 /**
  * @author kiva
@@ -15,6 +20,33 @@ class PackageSettingsActivity : AppCompatPreferenceActivity() {
         supportActionBar.title = getString(R.string.package_settings)
         supportActionBar.setDisplayHomeAsUpEnabled(true)
         addPreferencesFromResource(R.xml.settings_package)
+
+        val preference = findPreference(getString(R.string.key_package_source))
+        preference.summary = NeoPreference.loadString(R.string.key_package_source, NeoTermPath.DEFAULT_SOURCE)
+
+        preference.setOnPreferenceChangeListener { preference, newValue ->
+            val newSource = newValue as String
+            preference.summary = newSource
+            if (newSource.isNotEmpty()) {
+                val sourceFile = File(NeoTermPath.SOURCE_FILE)
+                FileUtils.writeFile(sourceFile, generateSourceFile(newSource).toByteArray())
+
+                AlertDialog.Builder(this@PackageSettingsActivity)
+                        .setMessage(R.string.source_changed)
+                        .setPositiveButton(android.R.string.yes, null)
+                        .show()
+            }
+            return@setOnPreferenceChangeListener true
+        }
+    }
+
+    private fun generateSourceFile(source: String): String {
+        return StringBuilder().append("# Generated by NeoTerm-Preference\n")
+                .append("deb ")
+                .append(source)
+                .append(" stable main")
+                .append("\n")
+                .toString()
     }
 
     override fun onBuildHeaders(target: MutableList<Header>?) {
diff --git a/app/src/main/java/io/neoterm/ui/settings/UISettingsActivity.kt b/app/src/main/java/io/neoterm/ui/settings/UISettingsActivity.kt
index 2d9e02f..da6ab69 100644
--- a/app/src/main/java/io/neoterm/ui/settings/UISettingsActivity.kt
+++ b/app/src/main/java/io/neoterm/ui/settings/UISettingsActivity.kt
@@ -1,5 +1,6 @@
 package io.neoterm.ui.settings
 
+import android.app.AlertDialog
 import android.os.Bundle
 import android.support.v7.app.AppCompatPreferenceActivity
 import android.view.MenuItem
@@ -16,7 +17,13 @@ class UISettingsActivity : AppCompatPreferenceActivity() {
         supportActionBar.setDisplayHomeAsUpEnabled(true)
         addPreferencesFromResource(R.xml.settings_ui)
         findPreference(getString(R.string.key_ui_suggestions))
-                .setOnPreferenceChangeListener({preference, newValue ->
+                .setOnPreferenceChangeListener({_, newValue ->
+                    if (newValue as Boolean) {
+                        AlertDialog.Builder(this@UISettingsActivity)
+                                .setMessage(R.string.installer_install_zsh_manually)
+                                .setPositiveButton(android.R.string.yes, null)
+                                .show()
+                    }
                     return@setOnPreferenceChangeListener true
                 })
     }
diff --git a/app/src/main/java/io/neoterm/utils/FileUtils.kt b/app/src/main/java/io/neoterm/utils/FileUtils.kt
index c00e573..1a94d72 100644
--- a/app/src/main/java/io/neoterm/utils/FileUtils.kt
+++ b/app/src/main/java/io/neoterm/utils/FileUtils.kt
@@ -1,31 +1,37 @@
 package io.neoterm.utils
 
 import java.io.File
+import java.io.FileInputStream
 import java.io.FileOutputStream
-import java.io.OutputStream
+import java.io.InputStream
 
 /**
  * @author kiva
  */
 object FileUtils {
     fun writeFile(path: File, bytes: ByteArray): Boolean {
-        var output: OutputStream? = null
-        var success = true
-        try {
-            output = FileOutputStream(path)
-            output.write(bytes)
-            output.flush()
-        } catch (e: Exception) {
-            e.printStackTrace()
-            success = false
-        } finally {
-            if (output != null) {
-                try {
-                    output.close()
-                } catch (ignore: Exception) {
-                }
-            }
+        return FileOutputStream(path).use {
+            it.write(bytes)
+            it.flush()
+            true
+        }
+    }
+
+    fun writeFile(path: File, inputStream: InputStream): Boolean {
+        val bytes = ByteArray(inputStream.available())
+        inputStream.read(bytes)
+        return writeFile(path, bytes)
+    }
+
+    fun readFile(path: File): ByteArray? {
+        if (!path.canRead()) {
+            return null
+        }
+
+        return FileInputStream(path).use {
+            val bytes = ByteArray(it.available())
+            it.read(bytes)
+            bytes
         }
-        return success
     }
 }
\ No newline at end of file
diff --git a/app/src/main/java/io/neoterm/utils/NeoTermFullScreen.java b/app/src/main/java/io/neoterm/utils/FullScreenHelper.java
similarity index 88%
rename from app/src/main/java/io/neoterm/utils/NeoTermFullScreen.java
rename to app/src/main/java/io/neoterm/utils/FullScreenHelper.java
index 647e891..db5c756 100644
--- a/app/src/main/java/io/neoterm/utils/NeoTermFullScreen.java
+++ b/app/src/main/java/io/neoterm/utils/FullScreenHelper.java
@@ -9,11 +9,10 @@ import android.widget.FrameLayout;
 /**
  * Helper class to "adjustResize" Activity when we are in full screen mode and check IME status.
  * Android Bug 5497: https://code.google.com/p/android/issues/detail?id=5497
- * author @kiva
  */
-public class NeoTermFullScreen {
-    public static NeoTermFullScreen injectActivity(Activity activity) {
-        return new NeoTermFullScreen(activity);
+public class FullScreenHelper {
+    public static FullScreenHelper injectActivity(Activity activity, boolean isRecreating) {
+        return new FullScreenHelper(activity, isRecreating);
     }
 
     public interface KeyBoardListener {
@@ -33,12 +32,14 @@ public class NeoTermFullScreen {
     private int mOriginHeight;
     private int mPreHeight;
     private KeyBoardListener mKeyBoardListener;
+    private boolean shouldSkipFirstTime;
 
     public void setKeyBoardListener(KeyBoardListener mKeyBoardListener) {
         this.mKeyBoardListener = mKeyBoardListener;
     }
 
-    private NeoTermFullScreen(Activity activity) {
+    private FullScreenHelper(Activity activity, boolean isRecreating) {
+        this.shouldSkipFirstTime = isRecreating;
         FrameLayout content = (FrameLayout) activity.findViewById(android.R.id.content);
         mChildOfContent = content.getChildAt(0);
         mChildOfContent.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
@@ -52,10 +53,12 @@ public class NeoTermFullScreen {
 
     private void monitorImeStatus() {
         int currHeight = mChildOfContent.getHeight();
-        if (currHeight == 0) {
+        if (currHeight == 0 && shouldSkipFirstTime) {
             // First time
             return;
         }
+
+        shouldSkipFirstTime = false;
         boolean hasChange = false;
         if (mPreHeight == 0) {
             mPreHeight = currHeight;
diff --git a/app/src/main/java/io/neoterm/view/ExtraKeysView.java b/app/src/main/java/io/neoterm/view/ExtraKeysView.java
index 3ce6f98..d0cb8cc 100755
--- a/app/src/main/java/io/neoterm/view/ExtraKeysView.java
+++ b/app/src/main/java/io/neoterm/view/ExtraKeysView.java
@@ -50,7 +50,7 @@ public final class ExtraKeysView extends LinearLayout {
             "define | false\n";
 
     public static final int NORMAL_TEXT_COLOR = 0xFFFFFFFF;
-
+    public static final int SELECTED_TEXT_COLOR = 0xFF80DEEA;
 
     private List<ExtraButton> builtinExtraKeys;
     private List<ExtraButton> userDefinedExtraKeys;
@@ -85,7 +85,6 @@ public final class ExtraKeysView extends LinearLayout {
         return line;
     }
 
-
     public boolean readControlButton() {
         return CTRL.readState();
     }
@@ -94,11 +93,21 @@ public final class ExtraKeysView extends LinearLayout {
         return false;
     }
 
-    public void addExternalButton(ExtraButton button) {
-        userDefinedExtraKeys.add(button);
+    public void addUserDefinedButton(ExtraButton button) {
+        addButton(userDefinedExtraKeys, button);
     }
 
-    public void clearExternalButton() {
+    public void addBuiltinButton(ExtraButton button) {
+        addButton(builtinExtraKeys, button);
+    }
+
+    private void addButton(List<ExtraButton> buttons, ExtraButton button) {
+        if (!buttons.contains(button)) {
+            buttons.add(button);
+        }
+    }
+
+    public void clearUserDefinedButton() {
         userDefinedExtraKeys.clear();
     }
 
@@ -109,7 +118,7 @@ public final class ExtraKeysView extends LinearLayout {
             generateDefaultFile(defaultFile);
         }
 
-        clearExternalButton();
+        clearUserDefinedButton();
         try {
             ShortcutConfigParser parser = new ShortcutConfigParser();
             parser.setInput(defaultFile);
@@ -153,6 +162,10 @@ public final class ExtraKeysView extends LinearLayout {
             StatedControlButton btn = ((StatedControlButton) extraButton);
             button = btn.toggleButton = new ToggleButton(getContext(), null, android.R.attr.buttonBarButtonStyle);
             button.setClickable(true);
+            if (btn.initState) {
+                btn.toggleButton.setChecked(true);
+                btn.toggleButton.setTextColor(SELECTED_TEXT_COLOR);
+            }
         } else {
             button = new Button(getContext(), null, android.R.attr.buttonBarButtonStyle);
         }
diff --git a/app/src/main/java/io/neoterm/view/eks/StatedControlButton.java b/app/src/main/java/io/neoterm/view/eks/StatedControlButton.java
index cdbc411..ab29e0a 100644
--- a/app/src/main/java/io/neoterm/view/eks/StatedControlButton.java
+++ b/app/src/main/java/io/neoterm/view/eks/StatedControlButton.java
@@ -11,15 +11,25 @@ import io.neoterm.view.ExtraKeysView;
 
 public class StatedControlButton extends ControlButton {
     public ToggleButton toggleButton;
+    public boolean initState;
+
+    public StatedControlButton(String text, boolean initState) {
+        super(text);
+        this.initState = initState;
+    }
 
     public StatedControlButton(String text) {
-        super(text);
+        this(text, false);
     }
 
     @Override
     public void onClick(View view) {
-        toggleButton.setChecked(toggleButton.isChecked());
-        toggleButton.setTextColor(toggleButton.isChecked() ? 0xFF80DEEA : ExtraKeysView.NORMAL_TEXT_COLOR);
+        setStatus(toggleButton.isChecked());
+    }
+
+    public void setStatus(boolean status) {
+        toggleButton.setChecked(status);
+        toggleButton.setTextColor(status ? ExtraKeysView.SELECTED_TEXT_COLOR : ExtraKeysView.NORMAL_TEXT_COLOR);
     }
 
     public boolean readState() {
diff --git a/app/src/main/java/io/neoterm/view/tab/CloseTabProvider.kt b/app/src/main/java/io/neoterm/view/tab/CloseTabProvider.kt
deleted file mode 100644
index 3ec733c..0000000
--- a/app/src/main/java/io/neoterm/view/tab/CloseTabProvider.kt
+++ /dev/null
@@ -1,10 +0,0 @@
-package io.neoterm.view.tab
-
-import de.mrapp.android.tabswitcher.Tab
-
-/**
- * @author kiva
- */
-interface CloseTabProvider {
-    fun closeTab(tab: Tab)
-}
\ No newline at end of file
diff --git a/app/src/main/java/io/neoterm/view/tab/TabCloseEvent.kt b/app/src/main/java/io/neoterm/view/tab/TabCloseEvent.kt
new file mode 100644
index 0000000..2203f0e
--- /dev/null
+++ b/app/src/main/java/io/neoterm/view/tab/TabCloseEvent.kt
@@ -0,0 +1,7 @@
+package io.neoterm.view.tab
+
+/**
+ * @author kiva
+ */
+
+class TabCloseEvent(var termTab: TermTab)
diff --git a/app/src/main/java/io/neoterm/view/tab/TermSessionChangedCallback.kt b/app/src/main/java/io/neoterm/view/tab/TermSessionChangedCallback.kt
index 6287b60..1f946b5 100644
--- a/app/src/main/java/io/neoterm/view/tab/TermSessionChangedCallback.kt
+++ b/app/src/main/java/io/neoterm/view/tab/TermSessionChangedCallback.kt
@@ -7,8 +7,7 @@ import android.media.SoundPool
 import android.os.Vibrator
 import io.neoterm.R
 import io.neoterm.backend.TerminalSession
-import io.neoterm.preference.NeoTermPreference
-import io.neoterm.view.ExtraKeysView
+import io.neoterm.preference.NeoPreference
 import io.neoterm.view.TerminalView
 
 /**
@@ -47,7 +46,7 @@ class TermSessionChangedCallback : TerminalSession.SessionChangedCallback {
             return
         }
 
-        if (NeoTermPreference.loadBoolean(R.string.key_general_bell, false)) {
+        if (NeoPreference.loadBoolean(R.string.key_general_bell, false)) {
             if (soundPool == null) {
                 soundPool = SoundPool.Builder().setMaxStreams(1).build()
                 bellId = soundPool!!.load(termView!!.context, R.raw.bell, 1)
@@ -55,7 +54,7 @@ class TermSessionChangedCallback : TerminalSession.SessionChangedCallback {
             soundPool?.play(bellId, 1f, 1f, 0, 0, 1f)
         }
 
-        if (NeoTermPreference.loadBoolean(R.string.key_general_vibrate, false)) {
+        if (NeoPreference.loadBoolean(R.string.key_general_vibrate, false)) {
             val vibrator = termView!!.context.getSystemService(Context.VIBRATOR_SERVICE) as Vibrator
             vibrator.vibrate(100)
         }
diff --git a/app/src/main/java/io/neoterm/view/tab/TermTab.kt b/app/src/main/java/io/neoterm/view/tab/TermTab.kt
index 0937020..e60dd30 100644
--- a/app/src/main/java/io/neoterm/view/tab/TermTab.kt
+++ b/app/src/main/java/io/neoterm/view/tab/TermTab.kt
@@ -1,12 +1,15 @@
 package io.neoterm.view.tab
 
+import android.content.Context
 import android.graphics.Color
 import android.support.v7.widget.Toolbar
+import android.view.inputmethod.InputMethodManager
 import de.mrapp.android.tabswitcher.Tab
 import io.neoterm.R
 import io.neoterm.backend.TerminalSession
 import io.neoterm.customize.color.NeoTermColorScheme
-import io.neoterm.preference.NeoTermPreference
+import io.neoterm.preference.NeoPreference
+import org.greenrobot.eventbus.EventBus
 
 /**
  * @author kiva
@@ -18,8 +21,6 @@ class TermTab(title: CharSequence) : Tab(title) {
     var viewClient: TermViewClient? = null
     var toolbar: Toolbar? = null
 
-    var closeTabProvider: CloseTabProvider? = null
-
     fun changeColorScheme(colorScheme: NeoTermColorScheme?) {
         colorScheme?.apply()
         viewClient?.extraKeysView?.setBackgroundColor(Color.parseColor(colorScheme?.background))
@@ -31,7 +32,6 @@ class TermTab(title: CharSequence) : Tab(title) {
         viewClient?.extraKeysView = null
         sessionCallback?.termView = null
         sessionCallback?.termTab = null
-        closeTabProvider = null
         toolbar = null
         termSession = null
     }
@@ -39,7 +39,7 @@ class TermTab(title: CharSequence) : Tab(title) {
     fun updateTitle(title: String) {
         this.title = title
         toolbar?.title = title
-        if (NeoTermPreference.loadBoolean(R.string.key_ui_suggestions, true)) {
+        if (NeoPreference.loadBoolean(R.string.key_ui_suggestions, true)) {
             viewClient?.updateSuggestions(title)
         } else {
             viewClient?.removeSuggestions()
@@ -51,6 +51,17 @@ class TermTab(title: CharSequence) : Tab(title) {
     }
 
     fun requiredCloseTab() {
-        closeTabProvider?.closeTab(this)
+        hideIme()
+        EventBus.getDefault().post(TabCloseEvent(this))
+    }
+
+    fun hideIme() {
+        val terminalView = viewClient?.termView
+        if (terminalView != null) {
+            val imm = terminalView.context.getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
+            if (imm.isActive) {
+                imm.hideSoftInputFromWindow(terminalView.windowToken, InputMethodManager.HIDE_NOT_ALWAYS)
+            }
+        }
     }
 }
diff --git a/app/src/main/java/io/neoterm/view/tab/TermTabDecorator.kt b/app/src/main/java/io/neoterm/view/tab/TermTabDecorator.kt
index 624cd9a..ed63f16 100644
--- a/app/src/main/java/io/neoterm/view/tab/TermTabDecorator.kt
+++ b/app/src/main/java/io/neoterm/view/tab/TermTabDecorator.kt
@@ -12,7 +12,7 @@ import de.mrapp.android.tabswitcher.Tab
 import de.mrapp.android.tabswitcher.TabSwitcher
 import de.mrapp.android.tabswitcher.TabSwitcherDecorator
 import io.neoterm.R
-import io.neoterm.preference.NeoTermPreference
+import io.neoterm.preference.NeoPreference
 import io.neoterm.ui.NeoTermActivity
 import io.neoterm.view.ExtraKeysView
 import io.neoterm.view.TerminalView
@@ -24,8 +24,12 @@ class TermTabDecorator(val context: NeoTermActivity) : TabSwitcherDecorator() {
     override fun onInflateView(inflater: LayoutInflater, parent: ViewGroup?, viewType: Int): View {
         val view = inflater.inflate(R.layout.term, parent, false)
         val toolbar = view.findViewById(R.id.terminal_toolbar) as Toolbar
-        toolbar.inflateMenu(R.menu.tab_switcher)
+        val extraKeysView = view.findViewById(R.id.extra_keys) as ExtraKeysView
 
+        extraKeysView.addBuiltinButton(context.fullScreenToggleButton)
+        extraKeysView.updateButtons()
+
+        toolbar.inflateMenu(R.menu.tab_switcher)
         toolbar.setOnMenuItemClickListener(context.createToolbarMenuListener())
         val menu = toolbar.menu
         TabSwitcher.setupWithMenu(context.tabSwitcher, menu, {
@@ -64,8 +68,9 @@ class TermTabDecorator(val context: NeoTermActivity) : TabSwitcherDecorator() {
         if (view == null) {
             return
         }
-        view.textSize = NeoTermPreference.loadInt(NeoTermPreference.KEY_FONT_SIZE, 30)
+        view.textSize = NeoPreference.loadInt(NeoPreference.KEY_FONT_SIZE, 30)
         view.setTypeface(Typeface.MONOSPACE)
+        context.fullScreenToggleButton.setStatus(NeoPreference.loadBoolean(R.string.key_ui_fullscreen, false))
 
         if (tab is TermTab) {
             val termTab = tab
diff --git a/app/src/main/java/io/neoterm/view/tab/TermViewClient.kt b/app/src/main/java/io/neoterm/view/tab/TermViewClient.kt
index 4f9e0c7..a2c3bfe 100644
--- a/app/src/main/java/io/neoterm/view/tab/TermViewClient.kt
+++ b/app/src/main/java/io/neoterm/view/tab/TermViewClient.kt
@@ -8,7 +8,7 @@ import android.view.inputmethod.InputMethodManager
 import io.neoterm.R
 import io.neoterm.backend.TerminalSession
 import io.neoterm.customize.shortcut.ShortcutKeysManager
-import io.neoterm.preference.NeoTermPreference
+import io.neoterm.preference.NeoPreference
 import io.neoterm.view.ExtraKeysView
 import io.neoterm.view.TerminalView
 import io.neoterm.view.TerminalViewClient
@@ -33,7 +33,7 @@ class TermViewClient(val context: Context) : TerminalViewClient {
             val changedSize = (if (increase) 1 else -1) * 2
             val fontSize = termView!!.textSize + changedSize
             termView!!.textSize = fontSize
-            NeoTermPreference.store(NeoTermPreference.KEY_FONT_SIZE, fontSize)
+            NeoPreference.store(NeoPreference.KEY_FONT_SIZE, fontSize)
             return 1.0f
         }
         return scale
@@ -45,7 +45,7 @@ class TermViewClient(val context: Context) : TerminalViewClient {
     }
 
     override fun shouldBackButtonBeMappedToEscape(): Boolean {
-        return NeoTermPreference.loadBoolean(R.string.key_generaL_backspace_map_to_esc, false)
+        return NeoPreference.loadBoolean(R.string.key_generaL_backspace_map_to_esc, false)
     }
 
     override fun copyModeChanged(copyMode: Boolean) {
@@ -118,7 +118,7 @@ class TermViewClient(val context: Context) : TerminalViewClient {
     }
 
     fun removeSuggestions() {
-        extraKeysView?.clearExternalButton()
+        extraKeysView?.clearUserDefinedButton()
     }
 
 }
\ No newline at end of file
diff --git a/app/src/main/res/layout/term.xml b/app/src/main/res/layout/term.xml
index c4fad6b..5436f99 100644
--- a/app/src/main/res/layout/term.xml
+++ b/app/src/main/res/layout/term.xml
@@ -20,7 +20,8 @@
         android:layout_height="@dimen/eks_height_two_line"
         android:layout_alignParentBottom="true"
         android:background="@color/terminal_background"
-        android:orientation="horizontal" />
+        android:orientation="horizontal"
+        android:visibility="gone" />
 
     <io.neoterm.view.TerminalView
         android:id="@+id/terminal_view"
diff --git a/app/src/main/res/values-zh/strings.xml b/app/src/main/res/values-zh/strings.xml
index 5eddb07..f0627ff 100644
--- a/app/src/main/res/values-zh/strings.xml
+++ b/app/src/main/res/values-zh/strings.xml
@@ -33,9 +33,11 @@
     <string name="ui_settings">界面设置</string>
     <string name="shell_not_found">Shell %s 未找到, 请先安装.</string>
     <string name="installer_message">正在安装</string>
+    <string name="installer_install_zsh_manually">你可以通过执行以下命令来配置 zsh 和快捷提示 ~/install-zsh.sh</string>
     <string name="fullscreen_mode_changed">全屏模式已改变，请重启 NeoTerm</string>
     <string name="permission_denied">NeoTerm 无法取得必需的权限，正在退出</string>
     <string name="error">还有这种操作？</string>
     <string name="use_system_shell">使用系统Shell</string>
     <string name="retry">重试</string>
+    <string name="source_changed">APT 源已更改，你可能需要执行 apt update 来更新</string>
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 4bb501c..cc6c92d 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -14,6 +14,7 @@
     <string name="package_settings">Package Settings</string>
 
     <string name="installer_message">Installing</string>
+    <string name="installer_install_zsh_manually">You may install zsh and setup suggestions by executing: ~/install-zsh.sh</string>
 
     <string name="pref_general_bell">Bell</string>
     <string name="pref_general_bell_desc">Bell when receiving \'\\a\'</string>
@@ -42,6 +43,7 @@
     <string name="error">Error</string>
     <string name="use_system_shell">System Shell</string>
     <string name="retry">Retry</string>
+    <string name="source_changed">APT source changed, you may get it updated by executing: apt update</string>
 
     <string-array name="pref_ui_color_scheme_entries" translatable="false">
         <item>Default</item>
diff --git a/app/src/main/res/xml/settings_package.xml b/app/src/main/res/xml/settings_package.xml
index cbaa987..3c2ab7d 100644
--- a/app/src/main/res/xml/settings_package.xml
+++ b/app/src/main/res/xml/settings_package.xml
@@ -2,7 +2,7 @@
 <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
 
     <EditTextPreference
-        android:enabled="false"
+        android:defaultValue="http://mirror.neoterm.studio"
         android:key="@string/key_package_source"
         android:title="@string/pref_package_source" />
 </PreferenceScreen>
\ No newline at end of file