diff --git a/app/src/main/java/io/legado/app/help/IntentHelp.kt b/app/src/main/java/io/legado/app/help/IntentHelp.kt
index 8d77301c5..55ee61ed0 100644
--- a/app/src/main/java/io/legado/app/help/IntentHelp.kt
+++ b/app/src/main/java/io/legado/app/help/IntentHelp.kt
@@ -3,7 +3,7 @@ package io.legado.app.help
 import android.content.Context
 import android.content.Intent
 import io.legado.app.R
-import io.legado.app.utils.toast
+import org.jetbrains.anko.toast
 
 object IntentHelp {
 
diff --git a/app/src/main/java/io/legado/app/service/ReadAloudService.kt b/app/src/main/java/io/legado/app/service/ReadAloudService.kt
index a28fbabc6..281a3bba0 100644
--- a/app/src/main/java/io/legado/app/service/ReadAloudService.kt
+++ b/app/src/main/java/io/legado/app/service/ReadAloudService.kt
@@ -22,8 +22,8 @@ import io.legado.app.ui.widget.page.TextChapter
 import io.legado.app.utils.getPrefBoolean
 import io.legado.app.utils.getPrefInt
 import io.legado.app.utils.postEvent
-import io.legado.app.utils.toast
 import kotlinx.coroutines.launch
+import org.jetbrains.anko.toast
 import java.util.*
 
 class ReadAloudService : BaseService(), TextToSpeech.OnInitListener, AudioManager.OnAudioFocusChangeListener {
diff --git a/app/src/main/java/io/legado/app/ui/about/AboutFragment.kt b/app/src/main/java/io/legado/app/ui/about/AboutFragment.kt
index 5f2220b07..e98523051 100644
--- a/app/src/main/java/io/legado/app/ui/about/AboutFragment.kt
+++ b/app/src/main/java/io/legado/app/ui/about/AboutFragment.kt
@@ -16,18 +16,19 @@ class AboutFragment : PreferenceFragmentCompat() {
         findPreference<Preference>("version")?.summary = App.INSTANCE.versionName
     }
 
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+        listView.overScrollMode = View.OVER_SCROLL_NEVER
+    }
+
     override fun onPreferenceTreeClick(preference: Preference?): Boolean {
         when (preference?.key) {
-
+            "mail" -> openIntent(Intent.ACTION_SENDTO, "mailto:kunfei.ge@gmail.com")
+            "gitHub" -> openIntent(Intent.ACTION_VIEW, getString(R.string.this_github_url))
         }
         return super.onPreferenceTreeClick(preference)
     }
 
-    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
-        super.onViewCreated(view, savedInstanceState)
-        listView.overScrollMode = View.OVER_SCROLL_NEVER
-    }
-
     private fun openIntent(intentName: String, address: String) {
         try {
             val intent = Intent(intentName)
diff --git a/app/src/main/java/io/legado/app/ui/bookinfo/edit/BookInfoEditActivity.kt b/app/src/main/java/io/legado/app/ui/bookinfo/edit/BookInfoEditActivity.kt
index 779cf962a..5d79d6e1c 100644
--- a/app/src/main/java/io/legado/app/ui/bookinfo/edit/BookInfoEditActivity.kt
+++ b/app/src/main/java/io/legado/app/ui/bookinfo/edit/BookInfoEditActivity.kt
@@ -8,8 +8,8 @@ import io.legado.app.R
 import io.legado.app.base.VMBaseActivity
 import io.legado.app.data.entities.Book
 import io.legado.app.utils.getViewModel
-import io.legado.app.utils.toast
 import kotlinx.android.synthetic.main.activity_book_info_edit.*
+import org.jetbrains.anko.toast
 
 class BookInfoEditActivity : VMBaseActivity<BookInfoEditViewModel>(R.layout.activity_book_info_edit) {
     override val viewModel: BookInfoEditViewModel
diff --git a/app/src/main/java/io/legado/app/ui/config/ConfigFragment.kt b/app/src/main/java/io/legado/app/ui/config/ConfigFragment.kt
index c33d584a5..2885572ae 100644
--- a/app/src/main/java/io/legado/app/ui/config/ConfigFragment.kt
+++ b/app/src/main/java/io/legado/app/ui/config/ConfigFragment.kt
@@ -60,7 +60,6 @@ class ConfigFragment : PreferenceFragmentCompat(), Preference.OnPreferenceChange
                 preference.context.getPrefString(preference.key, "")
             )
         }
-
     }
 
 }
\ No newline at end of file
diff --git a/app/src/main/java/io/legado/app/ui/readbook/ReadBookActivity.kt b/app/src/main/java/io/legado/app/ui/readbook/ReadBookActivity.kt
index 25295a158..3c0129034 100644
--- a/app/src/main/java/io/legado/app/ui/readbook/ReadBookActivity.kt
+++ b/app/src/main/java/io/legado/app/ui/readbook/ReadBookActivity.kt
@@ -205,6 +205,19 @@ class ReadBookActivity : VMBaseActivity<ReadBookViewModel>(R.layout.activity_rea
         return super.dispatchKeyEvent(event)
     }
 
+    override fun onKeyDown(keyCode: Int, event: KeyEvent?): Boolean {
+        when (keyCode) {
+            KeyEvent.KEYCODE_BACK -> {
+                if (readAloudStatus == Status.PLAY) {
+                    ReadAloudService.pause(this)
+                    toast(R.string.read_aloud_pause)
+                    return true
+                }
+            }
+        }
+        return super.onKeyDown(keyCode, event)
+    }
+
     /**
      * 书籍加载完成,开始加载章节内容
      */
diff --git a/app/src/main/java/io/legado/app/utils/Toasts.kt b/app/src/main/java/io/legado/app/utils/Toasts.kt
index 5fea5ad08..16c032fa0 100644
--- a/app/src/main/java/io/legado/app/utils/Toasts.kt
+++ b/app/src/main/java/io/legado/app/utils/Toasts.kt
@@ -1,6 +1,5 @@
 package io.legado.app.utils
 
-import android.content.Context
 import android.widget.Toast
 import androidx.fragment.app.Fragment
 import org.jetbrains.anko.longToast
@@ -14,17 +13,6 @@ import org.jetbrains.anko.toast
  */
 inline fun Fragment.toast(message: Int) = requireActivity().toast(message)
 
-/**
- * Display the simple Toast message with the [Toast.LENGTH_SHORT] duration.
- *
- * @param message the message text resource.
- */
-inline fun Context.toast(message: Int): Toast = Toast
-    .makeText(this, message, Toast.LENGTH_SHORT)
-    .apply {
-        show()
-    }
-
 /**
  * Display the simple Toast message with the [Toast.LENGTH_SHORT] duration.
  *
@@ -32,17 +20,6 @@ inline fun Context.toast(message: Int): Toast = Toast
  */
 inline fun Fragment.toast(message: CharSequence) = requireActivity().toast(message)
 
-/**
- * Display the simple Toast message with the [Toast.LENGTH_SHORT] duration.
- *
- * @param message the message text.
- */
-inline fun Context.toast(message: CharSequence): Toast = Toast
-    .makeText(this, message, Toast.LENGTH_SHORT)
-    .apply {
-        show()
-    }
-
 /**
  * Display the simple Toast message with the [Toast.LENGTH_LONG] duration.
  *
@@ -50,31 +27,9 @@ inline fun Context.toast(message: CharSequence): Toast = Toast
  */
 inline fun Fragment.longToast(message: Int) = requireActivity().longToast(message)
 
-/**
- * Display the simple Toast message with the [Toast.LENGTH_LONG] duration.
- *
- * @param message the message text resource.
- */
-inline fun Context.longToast(message: Int): Toast = Toast
-    .makeText(this, message, Toast.LENGTH_LONG)
-    .apply {
-        show()
-    }
-
 /**
  * Display the simple Toast message with the [Toast.LENGTH_LONG] duration.
  *
  * @param message the message text.
  */
 inline fun Fragment.longToast(message: CharSequence) = requireActivity().longToast(message)
-
-/**
- * Display the simple Toast message with the [Toast.LENGTH_LONG] duration.
- *
- * @param message the message text.
- */
-inline fun Context.longToast(message: CharSequence): Toast = Toast
-    .makeText(this, message, Toast.LENGTH_LONG)
-    .apply {
-        show()
-    }
\ No newline at end of file