优化

app/build.gradle

@@ -106,14 +106,14 @@ dependencies {
     implementation 'com.crashlytics.sdk.android:crashlytics:2.10.1'
 
     //androidX
-    implementation 'androidx.core:core-ktx:1.2.0-rc01'
+    implementation 'androidx.core:core-ktx:1.1.0'
     implementation 'androidx.appcompat:appcompat:1.1.0'
     implementation 'androidx.media:media:1.1.0'
     implementation 'androidx.preference:preference:1.1.0'
     implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
     implementation 'androidx.swiperefreshlayout:swiperefreshlayout:1.0.0'
     implementation 'androidx.viewpager2:viewpager2:1.0.0'
-    implementation 'com.google.android.material:material:1.2.0-alpha04'
+    implementation 'com.google.android.material:material:1.1.0'
     implementation 'com.google.android:flexbox:1.1.0'
 
     //lifecycle

app/src/main/java/io/legado/app/ui/filechooser/utils/FileUtils.kt

@@ -147,15 +147,15 @@ object FileUtils {
         if (!f.isDirectory) {
             return arrayOfNulls(0)
         }
-        val files = f.listFiles(FileFilter { f ->
-            if (f == null) {
+        val files = f.listFiles(FileFilter { file ->
+            if (file == null) {
                 return@FileFilter false
             }
-            if (f.isDirectory) {
+            if (file.isDirectory) {
                 return@FileFilter false
             }
 
-            filterPattern?.matcher(f.name)?.find() ?: true
+            filterPattern?.matcher(file.name)?.find() ?: true
         })
             ?: return arrayOfNulls(0)
         for (file in files) {

app/src/main/java/io/legado/app/utils/FragmentExtensions.kt

@@ -13,6 +13,7 @@ import org.jetbrains.anko.connectivityManager
 import org.jetbrains.anko.defaultSharedPreferences
 import org.jetbrains.anko.internals.AnkoInternals
 
+@Suppress("DEPRECATION")
 fun Fragment.isOnline() = requireContext().connectivityManager.activeNetworkInfo?.isConnected == true
 
 fun Fragment.getPrefBoolean(key: String, defValue: Boolean = false) =