diff --git a/app/src/main/java/io/github/muntashirakon/AppManager/activities/MainActivity.java b/app/src/main/java/io/github/muntashirakon/AppManager/activities/MainActivity.java
index 0241d5be631..c5a6b563d61 100644
--- a/app/src/main/java/io/github/muntashirakon/AppManager/activities/MainActivity.java
+++ b/app/src/main/java/io/github/muntashirakon/AppManager/activities/MainActivity.java
@@ -230,6 +230,9 @@ protected void onCreate(Bundle savedInstanceState) {
         });
         mBottomAppBar.setOnMenuItemClickListener(item -> {
             switch (item.getItemId()) {
+                case R.id.action_select_all:
+                    mAdapter.selectAll();
+                    return true;
                 case R.id.action_block_trackers:
                     handleBatchOp(BatchOpsManager.OP_BLOCK_TRACKERS, R.string.alert_failed_to_disable_trackers);
                     return true;
@@ -641,7 +644,7 @@ static class MainRecyclerAdapter extends RecyclerView.Adapter<MainRecyclerAdapte
         private MainActivity mActivity;
         private PackageManager mPackageManager;
         private String mSearchQuery;
-        private List<ApplicationItem> mAdapterList;
+        private final List<ApplicationItem> mAdapterList = new ArrayList<>();
 
         private static int mColorTransparent;
         private static int mColorSemiTransparent;
@@ -669,21 +672,36 @@ static class MainRecyclerAdapter extends RecyclerView.Adapter<MainRecyclerAdapte
         }
 
         void setDefaultList(List<ApplicationItem> list) {
-            mAdapterList = list;
-            mSearchQuery = mActivity.mModel.getSearchQuery();
-            notifyDataSetChanged();
+            synchronized (mAdapterList) {
+                mAdapterList.clear();
+                mAdapterList.addAll(list);
+                mSearchQuery = mActivity.mModel.getSearchQuery();
+                notifyDataSetChanged();
+            }
         }
 
         void clearSelection() {
-            final AtomicInteger itemId = new AtomicInteger();
-            for (ApplicationItem applicationItem: mActivity.mModel.getSelectedApplicationItems()) {
-                itemId.set(mAdapterList.indexOf(applicationItem));
-                if (itemId.get() == -1) continue;
-                applicationItem.isSelected = false;
-                mAdapterList.set(itemId.get(), applicationItem);
-                mActivity.runOnUiThread(() -> notifyItemChanged(itemId.get()));
+            synchronized (mAdapterList) {
+                final AtomicInteger itemId = new AtomicInteger();
+                for (ApplicationItem applicationItem : mActivity.mModel.getSelectedApplicationItems()) {
+                    itemId.set(mAdapterList.indexOf(applicationItem));
+                    if (itemId.get() == -1) continue;
+                    applicationItem.isSelected = false;
+                    mAdapterList.set(itemId.get(), applicationItem);
+                    mActivity.runOnUiThread(() -> notifyItemChanged(itemId.get()));
+                }
+                mActivity.mModel.clearSelection();
+            }
+        }
+
+        void selectAll() {
+            synchronized (mAdapterList) {
+                for (int i = 0; i < mAdapterList.size(); ++i) {
+                    mAdapterList.set(i, mActivity.mModel.select(mAdapterList.get(i)));
+                    notifyItemChanged(i);
+                }
+                mActivity.handleSelection();
             }
-            mActivity.mModel.clearSelection();
         }
 
         @NonNull
@@ -836,7 +854,7 @@ public long getItemId(int i) {
 
         @Override
         public int getItemCount() {
-            return mAdapterList == null ? 0 : mAdapterList.size();
+            return mAdapterList.size();
         }
 
         @Override
diff --git a/app/src/main/java/io/github/muntashirakon/AppManager/viewmodels/MainViewModel.java b/app/src/main/java/io/github/muntashirakon/AppManager/viewmodels/MainViewModel.java
index 35a39f02433..537f6de291e 100644
--- a/app/src/main/java/io/github/muntashirakon/AppManager/viewmodels/MainViewModel.java
+++ b/app/src/main/java/io/github/muntashirakon/AppManager/viewmodels/MainViewModel.java
@@ -22,10 +22,12 @@
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
+import java.util.HashSet;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Locale;
 import java.util.Objects;
+import java.util.Set;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
@@ -48,7 +50,7 @@ public class MainViewModel extends AndroidViewModel {
     private @MainActivity.SortOrder int mSortBy;
     private @MainActivity.Filter int mFilterFlags;
     private String searchQuery;
-    private List<String> selectedPackages = new LinkedList<>();
+    private Set<String> selectedPackages = new HashSet<>();
     private List<ApplicationItem> selectedApplicationItems = new LinkedList<>();
     private int flagSigningInfo;
     public MainViewModel(@NonNull Application application) {
@@ -107,7 +109,7 @@ public void clearSelection() {
         selectedApplicationItems.clear();
     }
 
-    public List<String> getSelectedPackages() {
+    public Set<String> getSelectedPackages() {
         return selectedPackages;
     }
 
diff --git a/app/src/main/res/drawable/ic_baseline_select_all_24.xml b/app/src/main/res/drawable/ic_baseline_select_all_24.xml
new file mode 100644
index 00000000000..faf39160b85
--- /dev/null
+++ b/app/src/main/res/drawable/ic_baseline_select_all_24.xml
@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+  <path
+      android:fillColor="?colorAccent"
+      android:pathData="M3,5h2L5,3c-1.1,0 -2,0.9 -2,2zM3,13h2v-2L3,11v2zM7,21h2v-2L7,19v2zM3,9h2L5,7L3,7v2zM13,3h-2v2h2L13,3zM19,3v2h2c0,-1.1 -0.9,-2 -2,-2zM5,21v-2L3,19c0,1.1 0.9,2 2,2zM3,17h2v-2L3,15v2zM9,3L7,3v2h2L9,3zM11,21h2v-2h-2v2zM19,13h2v-2h-2v2zM19,21c1.1,0 2,-0.9 2,-2h-2v2zM19,9h2L21,7h-2v2zM19,17h2v-2h-2v2zM15,21h2v-2h-2v2zM15,5h2L17,3h-2v2zM7,17h10L17,7L7,7v10zM9,9h6v6L9,15L9,9z"/>
+</vector>
diff --git a/app/src/main/res/menu/activity_main_selection_actions.xml b/app/src/main/res/menu/activity_main_selection_actions.xml
index cd93df66add..6c1f5381451 100644
--- a/app/src/main/res/menu/activity_main_selection_actions.xml
+++ b/app/src/main/res/menu/activity_main_selection_actions.xml
@@ -1,7 +1,15 @@
 <?xml version="1.0" encoding="utf-8"?>
-<menu xmlns:app="http://schemas.android.com/apk/res-auto"
+<menu xmlns:tools="http://schemas.android.com/tools"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:android="http://schemas.android.com/apk/res/android">
 
+    <item
+        android:id="@+id/action_select_all"
+        android:icon="@drawable/ic_baseline_select_all_24"
+        android:title="@string/select_all"
+        app:showAsAction="always"
+        tools:ignore="AlwaysShowAction" />
+
     <item
         android:id="@+id/action_uninstall"
         android:icon="@drawable/ic_delete_black_24dp"
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 5ebf230b9da..b11dd9b54d2 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -571,4 +571,5 @@
     <string name="filter_user_apps">User apps</string>
     <string name="filter_system_apps">System apps</string>
     <string name="filter_apps_with_rules">Apps with rules</string>
+    <string name="select_all">Select All</string>
 </resources>