up

app/src/main/java/io/legado/app/help/BookHelp.kt

@@ -16,12 +16,16 @@ import kotlin.math.min
 
 object BookHelp {
 
-    private var downloadPath =
+    private var downloadPath: String =
-        App.INSTANCE.getPrefString("downloadPath") ?: App.INSTANCE.getExternalFilesDir(null)
+        App.INSTANCE.getPrefString("downloadPath")
+            ?: App.INSTANCE.getExternalFilesDir(null)?.absolutePath
+            ?: App.INSTANCE.cacheDir.absolutePath
 
     fun upDownloadPath() {
         downloadPath =
-            App.INSTANCE.getPrefString("downloadPath") ?: App.INSTANCE.getExternalFilesDir(null)
+            App.INSTANCE.getPrefString("downloadPath")
+                ?: App.INSTANCE.getExternalFilesDir(null)?.absolutePath
+                        ?: App.INSTANCE.cacheDir.absolutePath
     }
 
     fun saveContent(book: Book, bookChapter: BookChapter, content: String) {

app/src/main/java/io/legado/app/ui/config/ConfigFragment.kt

@@ -6,7 +6,9 @@ import android.view.View
 import androidx.preference.ListPreference
 import androidx.preference.Preference
 import androidx.preference.PreferenceFragmentCompat
+import io.legado.app.App
 import io.legado.app.R
+import io.legado.app.help.BookHelp
 import io.legado.app.lib.theme.ATH
 import io.legado.app.utils.getPrefString
 
@@ -16,6 +18,7 @@ class ConfigFragment : PreferenceFragmentCompat(), Preference.OnPreferenceChange
 
     override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
         addPreferencesFromResource(R.xml.pref_config)
+        bindPreferenceSummaryToValue(findPreference("downloadPath"))
     }
 
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
@@ -34,8 +37,9 @@ class ConfigFragment : PreferenceFragmentCompat(), Preference.OnPreferenceChange
     }
 
     override fun onSharedPreferenceChanged(sharedPreferences: SharedPreferences?, key: String?) {
-
+        when (key) {
-
+            "downloadPath" -> BookHelp.upDownloadPath()
+        }
     }
 
     override fun onPreferenceChange(preference: Preference?, newValue: Any?): Boolean {
@@ -57,9 +61,18 @@ class ConfigFragment : PreferenceFragmentCompat(), Preference.OnPreferenceChange
             preference.onPreferenceChangeListener = this
             onPreferenceChange(
                 preference,
-                preference.context.getPrefString(preference.key, "")
+                getPreferenceString(preference.key)
             )
         }
     }
 
+    private fun getPreferenceString(key: String): String {
+        return when (key) {
+            "downloadPath" -> getPrefString("downloadPath")
+                ?: App.INSTANCE.getExternalFilesDir(null)?.absolutePath
+                ?: App.INSTANCE.cacheDir.absolutePath
+            else -> getPrefString(key, "")
+        }
+    }
+
 }

app/src/main/res/xml/pref_config.xml

@@ -24,4 +24,9 @@
         android:title="文字操作显示搜索"
         app:iconSpaceReserved="false" />
 
+    <Preference
+        android:key="downloadPath"
+        android:title="@string/download_path"
+        app:iconSpaceReserved="false" />
+
 </androidx.preference.PreferenceScreen>