From f8757b7112e4546cd7608376b96c156c7d0ab989 Mon Sep 17 00:00:00 2001
From: Weilun Du <wdu@google.com>
Date: Mon, 30 Mar 2020 13:27:13 -0700
Subject: [PATCH] [Settings] Fix crashes caused by null bluetooth adapter and
 ethernet manager

Emulator system image doesn't support bluetooth and ethernet manager
yet.
BUG: 150408099

Signed-off-by: Weilun Du <wdu@google.com>
Change-Id: Iab4f7b962f01755fe7d84956f9b54374f1e17408
(cherry picked from commit 08e95d0db0ee336a6a6681a5d820b28c6d7db67a)
---
 src/com/android/settings/TetherSettings.java        | 10 ++++++----
 src/com/android/settings/network/TetherEnabler.java |  5 +++--
 2 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/src/com/android/settings/TetherSettings.java b/src/com/android/settings/TetherSettings.java
index c61e5739948..ac758dccc35 100644
--- a/src/com/android/settings/TetherSettings.java
+++ b/src/com/android/settings/TetherSettings.java
@@ -172,7 +172,7 @@ public class TetherSettings extends RestrictedSettingsFragment
                 com.android.internal.R.string.config_ethernet_iface_regex);
 
         final boolean usbAvailable = mUsbRegexs.length != 0;
-        final boolean bluetoothAvailable = mBluetoothRegexs.length != 0;
+        final boolean bluetoothAvailable = adapter != null && mBluetoothRegexs.length != 0;
         final boolean ethernetAvailable = !TextUtils.isEmpty(mEthernetRegex);
 
         if (!usbAvailable || Utils.isMonkeyRunning()) {
@@ -326,7 +326,8 @@ public class TetherSettings extends RestrictedSettingsFragment
         if (intent != null) mTetherChangeReceiver.onReceive(activity, intent);
 
         mEthernetListener = new EthernetListener();
-        mEm.addListener(mEthernetListener);
+        if (mEm != null)
+            mEm.addListener(mEthernetListener);
 
         updateState();
     }
@@ -340,7 +341,8 @@ public class TetherSettings extends RestrictedSettingsFragment
         }
         getActivity().unregisterReceiver(mTetherChangeReceiver);
         mTm.unregisterTetheringEventCallback(mTetheringEventCallback);
-        mEm.removeListener(mEthernetListener);
+        if (mEm != null)
+            mEm.removeListener(mEthernetListener);
         mTetherChangeReceiver = null;
         mStartTetheringCallback = null;
         mTetheringEventCallback = null;
@@ -438,7 +440,7 @@ public class TetherSettings extends RestrictedSettingsFragment
         if (isTethered) {
             mEthernetTether.setEnabled(!mDataSaverEnabled);
             mEthernetTether.setChecked(true);
-        } else if (isAvailable || mEm.isAvailable()) {
+        } else if (isAvailable || (mEm != null && mEm.isAvailable())) {
             mEthernetTether.setEnabled(!mDataSaverEnabled);
             mEthernetTether.setChecked(false);
         } else {
diff --git a/src/com/android/settings/network/TetherEnabler.java b/src/com/android/settings/network/TetherEnabler.java
index c4b36d32c9d..87832d99817 100644
--- a/src/com/android/settings/network/TetherEnabler.java
+++ b/src/com/android/settings/network/TetherEnabler.java
@@ -212,7 +212,8 @@ public class TetherEnabler implements SwitchWidgetController.OnSwitchChangeListe
         // Only check bluetooth tethering state if not stopped by user already.
         if (!mBluetoothTetheringStoppedByUser) {
             final BluetoothPan pan = mBluetoothPan.get();
-            if (mBluetoothAdapter.getState() == BluetoothAdapter.STATE_ON
+            if (mBluetoothAdapter != null &&
+                mBluetoothAdapter.getState() == BluetoothAdapter.STATE_ON
                     && pan != null && pan.isTetheringOn()) {
                 tetherState |= TETHERING_BLUETOOTH_ON;
             }
@@ -279,7 +280,7 @@ public class TetherEnabler implements SwitchWidgetController.OnSwitchChangeListe
 
         if (choice == TETHERING_BLUETOOTH) {
             mBluetoothTetheringStoppedByUser = false;
-            if (isBluetoothTethering(state)) {
+            if (mBluetoothAdapter == null || isBluetoothTethering(state)) {
                 return;
             } else if (mBluetoothAdapter.getState() == BluetoothAdapter.STATE_OFF) {
                 if (DEBUG) {