[Settings] Try to reduce the time pending on BroadcastReceiver

This is not a design which could resolve the issue, but try to improve
it through reducing the time blocking on BroadcastReceiver and reducing
the happening of ANR.

Bug: 262209170
Test: local and auto
Change-Id: Idec4da3d1deaffb121a5c7a73aeb84b4b0331374

AndroidManifest.xml

@@ -4647,6 +4647,9 @@
             </intent-filter>
         </receiver>
 
+        <service android:name=".sim.receivers.SimSlotChangeService"
+                 android:permission="android.permission.BIND_JOB_SERVICE" />
+
         <receiver
             android:name=".sim.receivers.SimCompleteBootReceiver"
             android:exported="true">

res/values/integers.xml

@@ -21,6 +21,7 @@
     <integer name="job_anomaly_detection">102</integer>
     <integer name="device_index_update">103</integer>
     <integer name="sim_notification_send">104</integer>
+    <integer name="sim_slot_changed">105</integer>
 
     <!-- Controls the maximum number of faces enrollable during SUW -->
     <integer name="suw_max_faces_enrollable">1</integer>

src/com/android/settings/sim/receivers/SimSlotChangeReceiver.java

@@ -37,9 +37,6 @@ import java.util.List;
 public class SimSlotChangeReceiver extends BroadcastReceiver {
     private static final String TAG = "SlotChangeReceiver";
 
-    private final SimSlotChangeHandler mSlotChangeHandler = SimSlotChangeHandler.get();
-    private final Object mLock = new Object();
-
     @Override
     public void onReceive(Context context, Intent intent) {
 
@@ -49,20 +46,17 @@ public class SimSlotChangeReceiver extends BroadcastReceiver {
             return;
         }
 
-        final PendingResult pendingResult = goAsync();
-        ThreadUtils.postOnBackgroundThread(
-                () -> {
-                    synchronized (mLock) {
-                        if (shouldHandleSlotChange(context)) {
-                            mSlotChangeHandler.onSlotsStatusChange(context.getApplicationContext());
-                        }
-                    }
-                    ThreadUtils.postOnMainThread(pendingResult::finish);
-                });
+        SimSlotChangeService.scheduleSimSlotChange(context);
+    }
+
+    public static void runOnBackgroundThread(Context context) {
+        if (shouldHandleSlotChange(context)) {
+            SimSlotChangeHandler.get().onSlotsStatusChange(context.getApplicationContext());
+        }
     }
 
     // Checks whether the slot event should be handled.
-    private boolean shouldHandleSlotChange(Context context) {
+    private static boolean shouldHandleSlotChange(Context context) {
         if (!context.getResources().getBoolean(R.bool.config_handle_sim_slot_change)) {
             Log.i(TAG, "The flag is off. Ignore slot changes.");
             return false;
@@ -88,7 +82,7 @@ public class SimSlotChangeReceiver extends BroadcastReceiver {
     }
 
     // Checks whether the SIM slot state is valid for slot change event.
-    private boolean isSimSlotStateValid(Context context) {
+    private static boolean isSimSlotStateValid(Context context) {
         final TelephonyManager telMgr = context.getSystemService(TelephonyManager.class);
         UiccSlotInfo[] slotInfos = telMgr.getUiccSlotsInfo();
         if (slotInfos == null) {
@@ -136,7 +130,8 @@ public class SimSlotChangeReceiver extends BroadcastReceiver {
     }
 
     @Nullable
-    private UiccCardInfo findUiccCardInfoBySlot(TelephonyManager telMgr, int physicalSlotIndex) {
+    private static UiccCardInfo findUiccCardInfoBySlot(TelephonyManager telMgr,
+            int physicalSlotIndex) {
         List<UiccCardInfo> cardInfos = telMgr.getUiccCardsInfo();
         if (cardInfos == null) {
             return null;

src/com/android/settings/sim/receivers/SimSlotChangeService.java

@@ -0,0 +1,77 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.sim.receivers;
+
+import android.app.job.JobInfo;
+import android.app.job.JobParameters;
+import android.app.job.JobScheduler;
+import android.app.job.JobService;
+import android.content.ComponentName;
+import android.content.Context;
+import android.os.Handler;
+import android.os.HandlerThread;
+import android.util.Log;
+
+import com.android.settings.R;
+import com.android.settingslib.utils.ThreadUtils;
+
+import java.util.concurrent.Phaser;
+
+/** A JobService work on SIM slot change. */
+public class SimSlotChangeService extends JobService {
+
+    private static final String TAG = "SimSlotChangeService";
+
+    /**
+     * Schedules a service to work on SIM slot change.
+     *
+     * @param context is the caller context.
+     */
+    public static void scheduleSimSlotChange(Context context) {
+        Context appContext = context.getApplicationContext();
+        JobScheduler jobScheduler = appContext.getSystemService(JobScheduler.class);
+        ComponentName component = new ComponentName(appContext, SimSlotChangeService.class);
+
+        jobScheduler.schedule(
+                new JobInfo.Builder(R.integer.sim_slot_changed, component).build());
+    }
+
+    @Override
+    public boolean onStartJob(JobParameters params) {
+
+        HandlerThread thread = new HandlerThread(TAG);
+        thread.start();
+        final Phaser blocker = new Phaser(1);
+        Handler handler = new Handler(thread.getLooper());
+        handler.post(() -> {
+            try {
+                SimSlotChangeReceiver.runOnBackgroundThread(this);
+            } catch (Throwable exception) {
+                Log.e(TAG, "Exception running job", exception);
+            }
+            blocker.arrive();
+        });
+        blocker.awaitAdvance(0);
+        thread.quit();
+        return false;
+    }
+
+    @Override
+    public boolean onStopJob(JobParameters params) {
+        return false;
+    }
+}

tests/unit/src/com/android/settings/sim/receivers/SimSlotChangeServiceTest.java

@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.sim.receivers;
+
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.verify;
+
+import android.app.job.JobScheduler;
+import android.content.Context;
+import androidx.test.core.app.ApplicationProvider;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+
+@RunWith(AndroidJUnit4.class)
+public class SimSlotChangeServiceTest {
+
+    @Mock
+    private JobScheduler mJobScheduler;
+
+    private Context mContext;
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+
+        mContext = spy(ApplicationProvider.getApplicationContext());
+        doReturn(mContext).when(mContext).getApplicationContext();
+        mockService(Context.JOB_SCHEDULER_SERVICE, JobScheduler.class, mJobScheduler);
+    }
+
+    @Test
+    public void scheduleSimSlotChange_addSchedule_whenInvoked() {
+        SimSlotChangeService.scheduleSimSlotChange(mContext);
+        verify(mJobScheduler).schedule(any());
+    }
+
+    private <T> void mockService(String serviceName, Class<T> serviceClass, T service) {
+        doReturn(serviceName).when(mContext).getSystemServiceName(serviceClass);
+        doReturn(service).when(mContext).getSystemService(serviceName);
+    }
+}