采用Flow

app/src/main/java/io/legado/app/data/dao/RssArticleDao.kt

@@ -1,9 +1,9 @@
 package io.legado.app.data.dao
 
-import androidx.lifecycle.LiveData
 import androidx.room.*
 import io.legado.app.data.entities.RssArticle
 import io.legado.app.data.entities.RssReadRecord
+import kotlinx.coroutines.flow.Flow
 
 @Dao
 interface RssArticleDao {
@@ -12,12 +12,13 @@ interface RssArticleDao {
     fun get(origin: String, link: String): RssArticle?
 
     @Query(
-        """select t1.link, t1.sort, t1.origin, t1.`order`, t1.title, t1.content, t1.description, t1.image, t1.pubDate, t1.variable, ifNull(t2.read, 0) as read
+        """select t1.link, t1.sort, t1.origin, t1.`order`, t1.title, t1.content, 
+            t1.description, t1.image, t1.pubDate, t1.variable, ifNull(t2.read, 0) as read
         from rssArticles as t1 left join rssReadRecords as t2
         on t1.link = t2.record  where origin = :origin and sort = :sort
         order by `order` desc"""
     )
-    fun liveByOriginSort(origin: String, sort: String): LiveData<List<RssArticle>>
+    fun liveByOriginSort(origin: String, sort: String): Flow<List<RssArticle>>
 
     @Insert(onConflict = OnConflictStrategy.REPLACE)
     fun insert(vararg rssArticle: RssArticle)

app/src/main/java/io/legado/app/data/dao/RssStarDao.kt

@@ -1,8 +1,8 @@
 package io.legado.app.data.dao
 
-import androidx.lifecycle.LiveData
 import androidx.room.*
 import io.legado.app.data.entities.RssStar
+import kotlinx.coroutines.flow.Flow
 
 @Dao
 interface RssStarDao {
@@ -14,7 +14,7 @@ interface RssStarDao {
     fun get(origin: String, link: String): RssStar?
 
     @Query("select * from rssStars order by starTime desc")
-    fun liveAll(): LiveData<List<RssStar>>
+    fun liveAll(): Flow<List<RssStar>>
 
     @Insert(onConflict = OnConflictStrategy.REPLACE)
     fun insert(vararg rssStar: RssStar)

app/src/main/java/io/legado/app/ui/rss/article/RssArticlesFragment.kt

@@ -5,7 +5,6 @@ import android.os.Bundle
 import android.view.View
 import androidx.fragment.app.activityViewModels
 import androidx.fragment.app.viewModels
-import androidx.lifecycle.LiveData
 import androidx.recyclerview.widget.GridLayoutManager
 import androidx.recyclerview.widget.LinearLayoutManager
 import androidx.recyclerview.widget.RecyclerView
@@ -22,6 +21,9 @@ import io.legado.app.ui.widget.recycler.LoadMoreView
 import io.legado.app.ui.widget.recycler.VerticalDivider
 import io.legado.app.utils.startActivity
 import io.legado.app.utils.viewbindingdelegate.viewBinding
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.flow.collect
+import kotlinx.coroutines.launch
 
 class RssArticlesFragment : VMBaseFragment<RssArticlesViewModel>(R.layout.fragment_rss_articles),
     BaseRssArticlesAdapter.CallBack {
@@ -42,7 +44,7 @@ class RssArticlesFragment : VMBaseFragment<RssArticlesViewModel>(R.layout.fragme
     override val viewModel by viewModels<RssArticlesViewModel>()
     lateinit var adapter: BaseRssArticlesAdapter<*>
     private lateinit var loadMoreView: LoadMoreView
-    private var rssArticlesData: LiveData<List<RssArticle>>? = null
+    private var articlesFlowJob: Job? = null
     override val isGridLayout: Boolean
         get() = activityViewModel.isGridLayout
 
@@ -92,12 +94,12 @@ class RssArticlesFragment : VMBaseFragment<RssArticlesViewModel>(R.layout.fragme
     }
 
     private fun initData() {
-        activityViewModel.url?.let {
-            rssArticlesData?.removeObservers(this)
-            rssArticlesData = appDb.rssArticleDao.liveByOriginSort(it, viewModel.sortName)
-            rssArticlesData?.observe(viewLifecycleOwner, { list ->
-                adapter.setItems(list)
-            })
+        val rssUrl = activityViewModel.url ?: return
+        articlesFlowJob?.cancel()
+        articlesFlowJob = launch {
+            appDb.rssArticleDao.liveByOriginSort(rssUrl, viewModel.sortName).collect {
+                adapter.setItems(it)
+            }
         }
     }
 

app/src/main/java/io/legado/app/ui/rss/favorites/RssFavoritesActivity.kt

@@ -1,7 +1,6 @@
 package io.legado.app.ui.rss.favorites
 
 import android.os.Bundle
-import androidx.lifecycle.LiveData
 import androidx.recyclerview.widget.LinearLayoutManager
 import io.legado.app.base.BaseActivity
 import io.legado.app.data.appDb
@@ -11,13 +10,14 @@ import io.legado.app.ui.rss.read.ReadRssActivity
 import io.legado.app.ui.widget.recycler.VerticalDivider
 import io.legado.app.utils.startActivity
 import io.legado.app.utils.viewbindingdelegate.viewBinding
+import kotlinx.coroutines.flow.collect
+import kotlinx.coroutines.launch
 
 
 class RssFavoritesActivity : BaseActivity<ActivityRssFavoritesBinding>(),
     RssFavoritesAdapter.CallBack {
 
     override val binding by viewBinding(ActivityRssFavoritesBinding::inflate)
-    private var liveData: LiveData<List<RssStar>>? = null
     private lateinit var adapter: RssFavoritesAdapter
 
     override fun onActivityCreated(savedInstanceState: Bundle?) {
@@ -35,11 +35,11 @@ class RssFavoritesActivity : BaseActivity<ActivityRssFavoritesBinding>(),
     }
 
     private fun initData() {
-        liveData?.removeObservers(this)
-        liveData = appDb.rssStarDao.liveAll()
-        liveData?.observe(this, {
+        launch {
+            appDb.rssStarDao.liveAll().collect {
                 adapter.setItems(it)
-        })
+            }
+        }
     }
 
     override fun readRss(rssStar: RssStar) {