diff --git a/app/src/main/java/com/huanchengfly/tieba/post/activities/BaseActivity.kt b/app/src/main/java/com/huanchengfly/tieba/post/activities/BaseActivity.kt
index 1d07cb12..92a60eb0 100644
--- a/app/src/main/java/com/huanchengfly/tieba/post/activities/BaseActivity.kt
+++ b/app/src/main/java/com/huanchengfly/tieba/post/activities/BaseActivity.kt
@@ -37,8 +37,16 @@ import com.huanchengfly.tieba.post.ui.common.theme.interfaces.ExtraRefreshable
 import com.huanchengfly.tieba.post.ui.common.theme.utils.ThemeUtils
 import com.huanchengfly.tieba.post.ui.widgets.VoicePlayerView
 import com.huanchengfly.tieba.post.ui.widgets.theme.TintToolbar
-import com.huanchengfly.tieba.post.utils.*
-import kotlinx.coroutines.*
+import com.huanchengfly.tieba.post.utils.AppPreferencesUtils
+import com.huanchengfly.tieba.post.utils.DialogUtil
+import com.huanchengfly.tieba.post.utils.HandleBackUtil
+import com.huanchengfly.tieba.post.utils.ThemeUtil
+import com.huanchengfly.tieba.post.utils.calcStatusBarColorInt
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.CoroutineStart
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.launch
 import kotlin.coroutines.CoroutineContext
 
 abstract class BaseActivity : AppCompatActivity(), ExtraRefreshable, CoroutineScope {
@@ -54,7 +62,7 @@ abstract class BaseActivity : AppCompatActivity(), ExtraRefreshable, CoroutineSc
     private var customStatusColor = -1
     private var statusBarTinted = false
 
-    val appPreferences: AppPreferencesUtils by lazy { AppPreferencesUtils(this) }
+    val appPreferences: AppPreferencesUtils by lazy { AppPreferencesUtils.getInstance(this) }
 
     override fun onPause() {
         super.onPause()
diff --git a/app/src/main/java/com/huanchengfly/tieba/post/fragments/BaseFragment.kt b/app/src/main/java/com/huanchengfly/tieba/post/fragments/BaseFragment.kt
index bd32aedb..7f1fbd82 100644
--- a/app/src/main/java/com/huanchengfly/tieba/post/fragments/BaseFragment.kt
+++ b/app/src/main/java/com/huanchengfly/tieba/post/fragments/BaseFragment.kt
@@ -67,7 +67,7 @@ abstract class BaseFragment : Fragment(), BackHandledInterface, CoroutineScope {
             return mContext!!
         }
     protected val appPreferences: AppPreferencesUtils
-        get() = AppPreferencesUtils(attachContext)
+        get() = AppPreferencesUtils.getInstance(attachContext)
 
     @TargetApi(23)
     override fun onAttach(context: Context) {
diff --git a/app/src/main/java/com/huanchengfly/tieba/post/utils/AppPreferencesUtils.kt b/app/src/main/java/com/huanchengfly/tieba/post/utils/AppPreferencesUtils.kt
index 408bd468..84894f6a 100644
--- a/app/src/main/java/com/huanchengfly/tieba/post/utils/AppPreferencesUtils.kt
+++ b/app/src/main/java/com/huanchengfly/tieba/post/utils/AppPreferencesUtils.kt
@@ -22,13 +22,30 @@ import kotlinx.coroutines.SupervisorJob
 import kotlinx.coroutines.flow.distinctUntilChanged
 import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.launch
+import java.lang.ref.WeakReference
 import kotlin.properties.ReadWriteProperty
 import kotlin.reflect.KProperty
 
 
-open class AppPreferencesUtils(private val context: Context) {
+open class AppPreferencesUtils private constructor(ctx: Context) {
+    companion object {
+        private var instance: AppPreferencesUtils? = null
+
+        fun getInstance(context: Context): AppPreferencesUtils {
+            return instance ?: AppPreferencesUtils(context).also {
+                instance = it
+            }
+        }
+    }
+
+    private val contextWeakReference: WeakReference<Context> = WeakReference(ctx)
+
+    private val context: Context
+        get() = contextWeakReference.get()!!
+
     private val preferencesDataStore: DataStore<Preferences>
         get() = context.dataStore
+
     private val coroutineScope: CoroutineScope = CoroutineScope(Dispatchers.IO + SupervisorJob())
 
     var userLikeLastRequestUnix by DataStoreDelegates.long(defaultValue = 0L)
@@ -377,4 +394,4 @@ open class AppPreferencesUtils(private val context: Context) {
 }
 
 val Context.appPreferences: AppPreferencesUtils
-    get() = AppPreferencesUtils(this)
\ No newline at end of file
+    get() = AppPreferencesUtils.getInstance(this)
\ No newline at end of file