[shared_preferences] Removed deprecated AsyncTask API (flutter#3481)

Author: SirusCodes

packages/shared_preferences/shared_preferences/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 2.0.1
+
+* Removed deprecated [AsyncTask](https://developer.android.com/reference/android/os/AsyncTask) was deprecated in API level 30 ([#3481](https://github.com/flutter/plugins/pull/3481))
+
 ## 2.0.0
 
 * Migrate to null-safety.

packages/shared_preferences/shared_preferences/android/gradle/wrapper/gradle-wrapper.properties

@@ -2,4 +2,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-5.1.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.7-all.zip

packages/shared_preferences/shared_preferences/android/src/main/java/io/flutter/plugins/sharedpreferences/MethodCallHandlerImpl.java

@@ -6,7 +6,8 @@
 
 import android.content.Context;
 import android.content.SharedPreferences;
-import android.os.AsyncTask;
+import android.os.Handler;
+import android.os.Looper;
 import android.util.Base64;
 import io.flutter.plugin.common.MethodCall;
 import io.flutter.plugin.common.MethodChannel;
@@ -21,6 +22,10 @@
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.SynchronousQueue;
+import java.util.concurrent.ThreadPoolExecutor;
+import java.util.concurrent.TimeUnit;
 
 /**
  * Implementation of the {@link MethodChannel.MethodCallHandler} for the plugin. It is also
@@ -118,17 +123,24 @@ public void onMethodCall(MethodCall call, MethodChannel.Result result) {
 
   private void commitAsync(
       final SharedPreferences.Editor editor, final MethodChannel.Result result) {
-    new AsyncTask<Void, Void, Boolean>() {
-      @Override
-      protected Boolean doInBackground(Void... voids) {
-        return editor.commit();
-      }
+    final ExecutorService executor =
+        new ThreadPoolExecutor(0, 1, 30L, TimeUnit.SECONDS, new SynchronousQueue<Runnable>());
+    final Handler handler = new Handler(Looper.getMainLooper());
 
-      @Override
-      protected void onPostExecute(Boolean value) {
-        result.success(value);
-      }
-    }.execute();
+    executor.execute(
+        new Runnable() {
+          @Override
+          public void run() {
+            final boolean response = editor.commit();
+            handler.post(
+                new Runnable() {
+                  @Override
+                  public void run() {
+                    result.success(response);
+                  }
+                });
+          }
+        });
   }
 
   private List<String> decodeList(String encodedList) throws IOException {

packages/shared_preferences/shared_preferences/pubspec.yaml

@@ -2,7 +2,7 @@ name: shared_preferences
 description: Flutter plugin for reading and writing simple key-value pairs.
   Wraps NSUserDefaults on iOS and SharedPreferences on Android.
 homepage: https://github.com/flutter/plugins/tree/master/packages/shared_preferences/shared_preferences
-version: 2.0.0
+version: 2.0.1
 
 flutter:
   plugin: