采用Flow

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

@@ -1,8 +1,8 @@
 package io.legado.app.data.dao
 
-import androidx.lifecycle.LiveData
 import androidx.room.*
 import io.legado.app.data.entities.HttpTTS
+import kotlinx.coroutines.flow.Flow
 
 @Dao
 interface HttpTTSDao {
@@ -11,7 +11,7 @@ interface HttpTTSDao {
     val all: List<HttpTTS>
 
     @Query("select * from httpTTS order by name")
-    fun observeAll(): LiveData<List<HttpTTS>>
+    fun observeAll(): Flow<List<HttpTTS>>
 
     @get:Query("select count(*) from httpTTS")
     val count: Int

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

@@ -1,21 +1,24 @@
 package io.legado.app.data.dao
 
-import androidx.lifecycle.LiveData
 import androidx.room.*
 import io.legado.app.data.entities.ReplaceRule
+import kotlinx.coroutines.flow.Flow
 
 
 @Dao
 interface ReplaceRuleDao {
 
     @Query("SELECT * FROM replace_rules ORDER BY sortOrder ASC")
-    fun liveDataAll(): LiveData<List<ReplaceRule>>
+    fun liveDataAll(): Flow<List<ReplaceRule>>
 
     @Query("SELECT * FROM replace_rules where `group` like :key or name like :key ORDER BY sortOrder ASC")
-    fun liveDataSearch(key: String): LiveData<List<ReplaceRule>>
+    fun liveDataSearch(key: String): Flow<List<ReplaceRule>>
 
     @Query("SELECT * FROM replace_rules where `group` like :key ORDER BY sortOrder ASC")
-    fun liveDataGroupSearch(key: String): LiveData<List<ReplaceRule>>
+    fun liveDataGroupSearch(key: String): Flow<List<ReplaceRule>>
+
+    @Query("select `group` from replace_rules where `group` is not null and `group` <> ''")
+    fun liveGroup(): Flow<List<String>>
 
     @get:Query("SELECT MIN(sortOrder) FROM replace_rules")
     val minOrder: Int
@@ -44,9 +47,6 @@ interface ReplaceRuleDao {
     )
     fun findEnabledByScope(name: String, origin: String): List<ReplaceRule>
 
-    @Query("select `group` from replace_rules where `group` is not null and `group` <> ''")
-    fun liveGroup(): LiveData<List<String>>
-
     @Query("select * from replace_rules where `group` like '%' || :group || '%'")
     fun getByGroup(group: String): List<ReplaceRule>
 

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

@@ -1,8 +1,8 @@
 package io.legado.app.data.dao
 
-import androidx.lifecycle.LiveData
 import androidx.room.*
 import io.legado.app.data.entities.RuleSub
+import kotlinx.coroutines.flow.Flow
 
 @Dao
 interface RuleSubDao {
@@ -11,7 +11,7 @@ interface RuleSubDao {
     val all: List<RuleSub>
 
     @Query("select * from ruleSubs order by customOrder")
-    fun observeAll(): LiveData<List<RuleSub>>
+    fun observeAll(): Flow<List<RuleSub>>
 
     @get:Query("select customOrder from ruleSubs order by customOrder limit 0,1")
     val maxOrder: Int

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

@@ -1,8 +1,8 @@
 package io.legado.app.data.dao
 
-import androidx.lifecycle.LiveData
 import androidx.room.*
 import io.legado.app.data.entities.SearchKeyword
+import kotlinx.coroutines.flow.Flow
 
 
 @Dao
@@ -12,13 +12,13 @@ interface SearchKeywordDao {
     val all: List<SearchKeyword>
 
     @Query("SELECT * FROM search_keywords ORDER BY usage DESC")
-    fun liveDataByUsage(): LiveData<List<SearchKeyword>>
+    fun liveDataByUsage(): Flow<List<SearchKeyword>>
 
     @Query("SELECT * FROM search_keywords ORDER BY lastUseTime DESC")
-    fun liveDataByTime(): LiveData<List<SearchKeyword>>
+    fun liveDataByTime(): Flow<List<SearchKeyword>>
 
     @Query("SELECT * FROM search_keywords where word like '%'||:key||'%' ORDER BY usage DESC")
-    fun liveDataSearch(key: String): LiveData<List<SearchKeyword>>
+    fun liveDataSearch(key: String): Flow<List<SearchKeyword>>
 
     @Query("select * from search_keywords where word = :key")
     fun get(key: String): SearchKeyword?

app/src/main/java/io/legado/app/ui/book/read/config/SpeakEngineDialog.kt

@@ -9,7 +9,7 @@ import android.view.View
 import android.view.ViewGroup
 import androidx.appcompat.widget.Toolbar
 import androidx.fragment.app.viewModels
-import androidx.lifecycle.LiveData
+import androidx.lifecycle.lifecycleScope
 import androidx.recyclerview.widget.LinearLayoutManager
 import io.legado.app.R
 import io.legado.app.base.BaseDialogFragment
@@ -31,6 +31,8 @@ import io.legado.app.ui.document.FilePickerParam
 import io.legado.app.ui.widget.dialog.TextDialog
 import io.legado.app.utils.*
 import io.legado.app.utils.viewbindingdelegate.viewBinding
+import kotlinx.coroutines.flow.collect
+import kotlinx.coroutines.launch
 import splitties.init.appCtx
 
 
@@ -39,7 +41,6 @@ class SpeakEngineDialog : BaseDialogFragment(), Toolbar.OnMenuItemClickListener
     private val ttsUrlKey = "ttsUrlKey"
     lateinit var adapter: Adapter
     private val viewModel: SpeakEngineViewModel by viewModels()
-    private var httpTTSData: LiveData<List<HttpTTS>>? = null
     private var engineId = appCtx.getPrefLong(PreferKey.speakEngine)
     private val importDocResult = registerForActivityResult(FilePicker()) {
         it?.let {
@@ -103,11 +104,11 @@ class SpeakEngineDialog : BaseDialogFragment(), Toolbar.OnMenuItemClickListener
     }
 
     private fun initData() {
-        httpTTSData?.removeObservers(this)
-        httpTTSData = appDb.httpTTSDao.observeAll()
-        httpTTSData?.observe(this, {
+        lifecycleScope.launch {
+            appDb.httpTTSDao.observeAll().collect {
                 adapter.setItems(it)
-        })
+            }
+        }
     }
 
     override fun onMenuItemClick(item: MenuItem?): Boolean {

app/src/main/java/io/legado/app/ui/book/search/SearchActivity.kt

@@ -10,7 +10,6 @@ import android.view.View.VISIBLE
 import android.widget.TextView
 import androidx.activity.viewModels
 import androidx.appcompat.widget.SearchView
-import androidx.lifecycle.LiveData
 import androidx.lifecycle.lifecycleScope
 import androidx.recyclerview.widget.LinearLayoutManager
 import androidx.recyclerview.widget.RecyclerView
@@ -49,7 +48,7 @@ class SearchActivity : VMBaseActivity<ActivityBookSearchBinding, SearchViewModel
     private lateinit var historyKeyAdapter: HistoryKeyAdapter
     private lateinit var loadMoreView: LoadMoreView
     private lateinit var searchView: SearchView
-    private var historyData: LiveData<List<SearchKeyword>>? = null
+    private var historyFlowJob: Job? = null
     private var booksFlowJob: Job? = null
     private var menu: Menu? = null
     private var precisionSearchMenuItem: MenuItem? = null
@@ -292,22 +291,20 @@ class SearchActivity : VMBaseActivity<ActivityBookSearchBinding, SearchViewModel
                 }
             }
         }
-
-        historyData?.removeObservers(this)
-        historyData =
-            if (key.isNullOrBlank()) {
-                appDb.searchKeywordDao.liveDataByUsage()
-            } else {
-                appDb.searchKeywordDao.liveDataSearch(key)
-            }
-        historyData?.observe(this, {
+        historyFlowJob?.cancel()
+        historyFlowJob = lifecycleScope.launch {
+            when {
+                key.isNullOrBlank() -> appDb.searchKeywordDao.liveDataByUsage()
+                else -> appDb.searchKeywordDao.liveDataSearch(key)
+            }.collect {
                 historyKeyAdapter.setItems(it)
                 if (it.isEmpty()) {
                     binding.tvClearHistory.invisible()
                 } else {
                     binding.tvClearHistory.visible()
                 }
-        })
+            }
+        }
     }
 
     /**

app/src/main/java/io/legado/app/ui/replace/GroupManageDialog.kt

@@ -10,6 +10,7 @@ import android.view.ViewGroup
 import androidx.appcompat.widget.Toolbar
 import androidx.fragment.app.DialogFragment
 import androidx.fragment.app.activityViewModels
+import androidx.lifecycle.lifecycleScope
 import androidx.recyclerview.widget.LinearLayoutManager
 import io.legado.app.R
 import io.legado.app.base.adapter.ItemViewHolder
@@ -25,6 +26,8 @@ import io.legado.app.lib.theme.primaryColor
 import io.legado.app.ui.widget.recycler.VerticalDivider
 import io.legado.app.utils.*
 import io.legado.app.utils.viewbindingdelegate.viewBinding
+import kotlinx.coroutines.flow.collect
+import kotlinx.coroutines.launch
 
 
 class GroupManageDialog : DialogFragment(), Toolbar.OnMenuItemClickListener {
@@ -50,10 +53,11 @@ class GroupManageDialog : DialogFragment(), Toolbar.OnMenuItemClickListener {
         super.onViewCreated(view, savedInstanceState)
         view.setBackgroundColor(backgroundColor)
         binding.toolBar.setBackgroundColor(primaryColor)
+        initView()
         initData()
     }
 
-    private fun initData() = binding.run {
+    private fun initView() = binding.run {
         toolBar.title = getString(R.string.group_manage)
         toolBar.inflateMenu(R.menu.group_manage)
         toolBar.menu.applyTint(requireContext())
@@ -62,13 +66,18 @@ class GroupManageDialog : DialogFragment(), Toolbar.OnMenuItemClickListener {
         recyclerView.layoutManager = LinearLayoutManager(requireContext())
         recyclerView.addItemDecoration(VerticalDivider(requireContext()))
         recyclerView.adapter = adapter
-        appDb.replaceRuleDao.liveGroup().observe(viewLifecycleOwner, {
+    }
+
+    private fun initData() {
+        lifecycleScope.launch {
+            appDb.replaceRuleDao.liveGroup().collect {
                 val groups = linkedSetOf<String>()
                 it.map { group ->
                     groups.addAll(group.splitNotBlank(AppPattern.splitGroupRegex))
                 }
                 adapter.setItems(groups.toList())
-        })
+            }
+        }
     }
 
     override fun onMenuItemClick(item: MenuItem?): Boolean {

app/src/main/java/io/legado/app/ui/replace/ReplaceRuleActivity.kt

@@ -11,7 +11,7 @@ import androidx.activity.viewModels
 import androidx.appcompat.widget.PopupMenu
 import androidx.appcompat.widget.SearchView
 import androidx.documentfile.provider.DocumentFile
-import androidx.lifecycle.LiveData
+import androidx.lifecycle.lifecycleScope
 import androidx.recyclerview.widget.ItemTouchHelper
 import androidx.recyclerview.widget.LinearLayoutManager
 import io.legado.app.R
@@ -39,6 +39,9 @@ import io.legado.app.ui.widget.recycler.ItemTouchCallback
 import io.legado.app.ui.widget.recycler.VerticalDivider
 import io.legado.app.utils.*
 import io.legado.app.utils.viewbindingdelegate.viewBinding
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.flow.collect
+import kotlinx.coroutines.launch
 import java.io.File
 
 /**
@@ -56,7 +59,7 @@ class ReplaceRuleActivity : VMBaseActivity<ActivityReplaceRuleBinding, ReplaceRu
     private lateinit var searchView: SearchView
     private var groups = hashSetOf<String>()
     private var groupMenu: SubMenu? = null
-    private var replaceRuleLiveData: LiveData<List<ReplaceRule>>? = null
+    private var replaceRuleFlowJob: Job? = null
     private var dataInit = false
     private val qrCodeResult = registerForActivityResult(QrCodeResult()) {
         it ?: return@registerForActivityResult
@@ -173,8 +176,9 @@ class ReplaceRuleActivity : VMBaseActivity<ActivityReplaceRuleBinding, ReplaceRu
 
     private fun observeReplaceRuleData(searchKey: String? = null) {
         dataInit = false
-        replaceRuleLiveData?.removeObservers(this)
-        replaceRuleLiveData = when {
+        replaceRuleFlowJob?.cancel()
+        replaceRuleFlowJob = lifecycleScope.launch {
+            when {
                 searchKey.isNullOrEmpty() -> {
                     appDb.replaceRuleDao.liveDataAll()
                 }
@@ -185,25 +189,26 @@ class ReplaceRuleActivity : VMBaseActivity<ActivityReplaceRuleBinding, ReplaceRu
                 else -> {
                     appDb.replaceRuleDao.liveDataSearch("%$searchKey%")
                 }
-        }.apply {
-            observe(this@ReplaceRuleActivity, {
+            }.collect {
                 if (dataInit) {
                     setResult(Activity.RESULT_OK)
                 }
                 adapter.setItems(it, adapter.diffItemCallBack)
                 dataInit = true
-            })
+            }
         }
     }
 
     private fun observeGroupData() {
-        appDb.replaceRuleDao.liveGroup().observe(this, {
+        lifecycleScope.launch {
+            appDb.replaceRuleDao.liveGroup().collect {
                 groups.clear()
                 it.map { group ->
                     groups.addAll(group.splitNotBlank(AppPattern.splitGroupRegex))
                 }
                 upGroupMenu()
-        })
+            }
+        }
     }
 
     override fun onCompatOptionsItemSelected(item: MenuItem): Boolean {

app/src/main/java/io/legado/app/ui/rss/subscription/RuleSubActivity.kt

@@ -4,7 +4,6 @@ import android.os.Bundle
 import android.view.Menu
 import android.view.MenuItem
 import androidx.core.view.isGone
-import androidx.lifecycle.LiveData
 import androidx.lifecycle.lifecycleScope
 import androidx.recyclerview.widget.ItemTouchHelper
 import io.legado.app.R
@@ -22,6 +21,7 @@ import io.legado.app.utils.startActivity
 import io.legado.app.utils.toastOnUi
 import io.legado.app.utils.viewbindingdelegate.viewBinding
 import kotlinx.coroutines.Dispatchers.IO
+import kotlinx.coroutines.flow.collect
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
 
@@ -33,7 +33,6 @@ class RuleSubActivity : BaseActivity<ActivityRuleSubBinding>(),
 
     override val binding by viewBinding(ActivityRuleSubBinding::inflate)
     private lateinit var adapter: RuleSubAdapter
-    private var liveData: LiveData<List<RuleSub>>? = null
 
     override fun onActivityCreated(savedInstanceState: Bundle?) {
         initView()
@@ -64,13 +63,13 @@ class RuleSubActivity : BaseActivity<ActivityRuleSubBinding>(),
     }
 
     private fun initData() {
-        liveData?.removeObservers(this)
-        liveData = appDb.ruleSubDao.observeAll()
-        liveData?.observe(this) {
+        lifecycleScope.launch {
+            appDb.ruleSubDao.observeAll().collect {
                 binding.tvEmptyMsg.isGone = it.isNotEmpty()
                 adapter.setItems(it)
             }
         }
+    }
 
     override fun openSubscription(ruleSub: RuleSub) {
         when (ruleSub.type) {