diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 5673a3b..463685d 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -38,7 +38,7 @@
     <uses-permission android:name="android.permission.READ_SYNC_SETTINGS" />
     <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
     <uses-permission android:name="com.google.android.googleapps.permission.GOOGLE_AUTH.mail" />
-    <uses-sdk android:minSdkVersion="15" android:targetSdkVersion="18"></uses-sdk>
+    <uses-sdk android:minSdkVersion="15" android:targetSdkVersion="23"></uses-sdk>
 
     <application android:name="CalendarApplication"
             android:label="@string/app_label" android:icon="@mipmap/ic_launcher_calendar"
@@ -140,6 +140,10 @@
 
         <activity android:name="CalendarSettingsActivity" android:label="@string/preferences_title"
             android:theme="@android:style/Theme.Holo.Light"/>
+        <activity android:name="com.android.calendar.RequestPermissionsActivity" >
+        </activity>
+        <activity android:name="com.android.calendar.RequestPermissionsActivityBase" >
+        </activity>
 
         <!-- Declarations for search -->
         <!-- Make all activities a searchable context -->
diff --git a/res/values/strings.xml b/res/values/strings.xml
index caec61b..55a9968 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -16,7 +16,8 @@
 <resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">
     <!-- This is the label underneath the icon for Calendar -->
     <string name="app_label">Calendar</string>
-
+    <!-- on permission of read_calendar -->
+    <string name="on_permission_read_calendar">You have disabled a required permission.</string>
     <!-- Shared Labels. These labels are shared among the activities. -->
     <skip/>
     <!-- This is the label for the title or name of an event -->
diff --git a/src/com/android/calendar/AllInOneActivity.java b/src/com/android/calendar/AllInOneActivity.java
index 0e1feb4..b785d16 100644
--- a/src/com/android/calendar/AllInOneActivity.java
+++ b/src/com/android/calendar/AllInOneActivity.java
@@ -302,6 +302,9 @@
 
     @Override
     protected void onCreate(Bundle icicle) {
+        if (RequestPermissionsActivity.startPermissionActivity(this)) {
+            finish();
+        }
         if (Utils.getSharedPreference(this, OtherPreferences.KEY_OTHER_1, false)) {
             setTheme(R.style.CalendarTheme_WithActionBarWallpaper);
         }
diff --git a/src/com/android/calendar/RequestPermissionsActivity.java b/src/com/android/calendar/RequestPermissionsActivity.java
new file mode 100644
index 0000000..504bb9c
--- /dev/null
+++ b/src/com/android/calendar/RequestPermissionsActivity.java
@@ -0,0 +1,58 @@
+/*
+ * Copyright (c) 2016, The Linux Foundation. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above
+      copyright notice, this list of conditions and the following
+      disclaimer in the documentation and/or other materials provided
+      with the distribution.
+    * Neither the name of The Linux Foundation nor the names of its
+      contributors may be used to endorse or promote products derived
+      from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package com.android.calendar;
+
+import android.Manifest.permission;
+import android.app.Activity;
+
+/**
+ * Activity that requests permissions needed for activities exported from canlendar.
+ */
+public class RequestPermissionsActivity extends RequestPermissionsActivityBase {
+
+    private static final String[] REQUIRED_PERMISSIONS = new String[] {
+    // "Calendar" group. Without this permission.
+    permission.READ_CALENDAR };
+
+    @Override
+    protected String[] getRequiredPermissions() {
+        return REQUIRED_PERMISSIONS;
+    }
+
+    @Override
+    protected String[] getDesiredPermissions() {
+        return new String[] { permission.READ_CALENDAR };
+    }
+
+    public static boolean startPermissionActivity(Activity activity) {
+        return startPermissionActivity(activity, REQUIRED_PERMISSIONS,
+                RequestPermissionsActivity.class);
+    }
+}
diff --git a/src/com/android/calendar/RequestPermissionsActivityBase.java b/src/com/android/calendar/RequestPermissionsActivityBase.java
new file mode 100644
index 0000000..751c12f
--- /dev/null
+++ b/src/com/android/calendar/RequestPermissionsActivityBase.java
@@ -0,0 +1,168 @@
+/*
+ * Copyright (c) 2016, The Linux Foundation. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above
+      copyright notice, this list of conditions and the following
+      disclaimer in the documentation and/or other materials provided
+      with the distribution.
+    * Neither the name of The Linux Foundation nor the names of its
+      contributors may be used to endorse or promote products derived
+      from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package com.android.calendar;
+
+import android.app.Activity;
+import android.content.Context;
+import android.content.Intent;
+import android.content.pm.PackageManager;
+import android.os.Bundle;
+import android.os.Trace;
+import android.widget.Toast;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+
+/**
+ * Activity that asks the user for all {@link #getDesiredPermissions} if any of
+ * {@link #getRequiredPermissions} are missing.
+ *
+ * NOTE: As a result of b/22095159, this can behave oddly in the case where the
+ * final permission you are requesting causes an application restart.
+ */
+public abstract class RequestPermissionsActivityBase extends Activity {
+    public static final String PREVIOUS_ACTIVITY_INTENT = "previous_intent";
+    private static final int PERMISSIONS_REQUEST_ALL_PERMISSIONS = 1;
+
+    /**
+     * @return list of permissions that are needed in order for
+     *         {@link #PREVIOUS_ACTIVITY_INTENT} to operate. You only need to
+     *         return a single permission per permission group you care about.
+     */
+    protected abstract String[] getRequiredPermissions();
+
+    /**
+     * @return list of permissions that would be useful for
+     *         {@link #PREVIOUS_ACTIVITY_INTENT} to operate. You only need to
+     *         return a single permission per permission group you care about.
+     */
+    protected abstract String[] getDesiredPermissions();
+
+    private Intent mPreviousActivityIntent;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        mPreviousActivityIntent = (Intent) getIntent().getExtras().get(
+                PREVIOUS_ACTIVITY_INTENT);
+
+        if (savedInstanceState == null) {
+            requestPermissions();
+        }
+    }
+
+    /**
+     * If any permissions the canlendar app needs are missing, open an Activity
+     * to prompt the user for these permissions. Moreover, finish the current
+     * activity.
+     *
+     * This is designed to be called inside
+     * {@link android.app.Activity#onCreate}
+     */
+    protected static boolean startPermissionActivity(Activity activity,
+            String[] requiredPermissions, Class<?> newActivityClass) {
+        if (!RequestPermissionsActivity.hasPermissions(activity,
+                requiredPermissions)) {
+            final Intent intent = new Intent(activity, newActivityClass);
+            intent.putExtra(PREVIOUS_ACTIVITY_INTENT, activity.getIntent());
+            activity.startActivity(intent);
+            activity.finish();
+            return true;
+        }
+        return false;
+    }
+
+    @Override
+    public void onRequestPermissionsResult(int requestCode,
+            String permissions[], int[] grantResults) {
+        if (permissions != null && permissions.length > 0
+                && isAllGranted(permissions, grantResults)) {
+            mPreviousActivityIntent.setFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);
+            startActivity(mPreviousActivityIntent);
+            finish();
+            overridePendingTransition(0, 0);
+        } else {
+            Toast.makeText(this, R.string.on_permission_read_calendar, Toast.LENGTH_SHORT).show();
+            finish();
+        }
+    }
+
+    private boolean isAllGranted(String permissions[], int[] grantResult) {
+        for (int i = 0; i < permissions.length; i++) {
+            if (grantResult[i] != PackageManager.PERMISSION_GRANTED
+                    && isPermissionRequired(permissions[i])) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    private boolean isPermissionRequired(String p) {
+        return Arrays.asList(getRequiredPermissions()).contains(p);
+    }
+
+    private void requestPermissions() {
+        Trace.beginSection("requestPermissions");
+        try {
+            // Construct a list of missing permissions
+            final ArrayList<String> unsatisfiedPermissions = new ArrayList<>();
+            for (String permission : getDesiredPermissions()) {
+                if (checkSelfPermission(permission)
+                        != PackageManager.PERMISSION_GRANTED) {
+                    unsatisfiedPermissions.add(permission);
+                }
+            }
+            if (unsatisfiedPermissions.size() == 0) {
+                throw new RuntimeException("Request permission activity was called even"
+                        + " though all permissions are satisfied.");
+            }
+            requestPermissions(
+                    unsatisfiedPermissions.toArray(new String[unsatisfiedPermissions.size()]),
+                    PERMISSIONS_REQUEST_ALL_PERMISSIONS);
+        } finally {
+            Trace.endSection();
+        }
+    }
+
+    protected static boolean hasPermissions(Context context,
+            String[] permissions) {
+        Trace.beginSection("hasPermission");
+        try {
+            for (String permission : permissions) {
+                if (context.checkSelfPermission(permission) != PackageManager.PERMISSION_GRANTED) {
+                    return false;
+                }
+            }
+            return true;
+        } finally {
+            Trace.endSection();
+        }
+    }
+}