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Commit 6572eae9 authored by Jason Monk's avatar Jason Monk
Browse files

Fix crash in Wifi QS Panel 

When open QS wifi panel while wifi was off was causing a crash from
wifi enabling while the WifiTracker was not in a scanning state.
Fix plus a test enclosed.

Bug: 19322090
Change-Id: Id863cdcbf4aa8d50822de3a200355dbaee74b488
parent efee230f

packages/SettingsLib/src/com/android/settingslib/wifi/WifiTracker.java

+25 −10
Original line number Diff line number Diff line
@@ -127,6 +127,7 @@ public class WifiTracker { 
    public void pauseScanning() {

        if (mScanner != null) {

            mScanner.pause();

            mScanner = null;

        }

    }
@@ -134,10 +135,10 @@ public class WifiTracker { 
     * Resume scanning for wifi networks after it has been paused.

     */

    public void resumeScanning() {

        if (mWifiManager.isWifiEnabled()) {

        if (mScanner == null) {

            mScanner = new Scanner();

        }

        if (mWifiManager.isWifiEnabled()) {

            mScanner.resume();

        }

        updateAccessPoints();
@@ -335,12 +336,18 @@ public class WifiTracker { 


    private void updateWifiState(int state) {

        if (state == WifiManager.WIFI_STATE_ENABLED) {

            if (mScanner != null) {

                // We only need to resume if mScanner isn't null because

                // that means we want to be scanning.

                mScanner.resume();

            }

        } else {

            mLastInfo = null;

            mLastNetworkInfo = null;

            if (mScanner != null) {

                mScanner.pause();

            }

        }

        if (mListener != null) {

            mListener.onWifiStateChanged(state);

        }
@@ -382,26 +389,34 @@ public class WifiTracker { 


    @VisibleForTesting

    class Scanner extends Handler {

        private static final int MSG_SCAN = 0;



        private int mRetry = 0;



        void resume() {

            if (!hasMessages(0)) {

                sendEmptyMessage(0);

            if (!hasMessages(MSG_SCAN)) {

                sendEmptyMessage(MSG_SCAN);

            }

        }



        void forceScan() {

            removeMessages(0);

            sendEmptyMessage(0);

            removeMessages(MSG_SCAN);

            sendEmptyMessage(MSG_SCAN);

        }



        void pause() {

            mRetry = 0;

            removeMessages(0);

            removeMessages(MSG_SCAN);

        }



        @VisibleForTesting

        boolean isScanning() {

            return hasMessages(MSG_SCAN);

        }



        @Override

        public void handleMessage(Message message) {

            if (message.what != MSG_SCAN) return;

            if (mWifiManager.startScan()) {

                mRetry = 0;

            } else if (++mRetry >= 3) {

packages/SettingsLib/tests/src/com/android/settingslib/wifi/WifiTrackerTest.java

+23 −0
Original line number Diff line number Diff line
@@ -201,6 +201,29 @@ public class WifiTrackerTest extends BaseTest { 
        assertTrue("Connected to wifi", accessPoints.get(0).isActive());

    }



    public void testEnableResumeScanning() {

        mWifiTracker.mScanner = null;



        Intent i = new Intent(WifiManager.WIFI_STATE_CHANGED_ACTION);

        // Make sure disable/enable cycle works with no scanner (no crashing).

        i.putExtra(WifiManager.EXTRA_WIFI_STATE, WifiManager.WIFI_STATE_DISABLED);

        mWifiTracker.mReceiver.onReceive(mContext, i);

        i.putExtra(WifiManager.EXTRA_WIFI_STATE, WifiManager.WIFI_STATE_ENABLED);

        mWifiTracker.mReceiver.onReceive(mContext, i);



        Mockito.when(mWifiManager.isWifiEnabled()).thenReturn(false);

        i.putExtra(WifiManager.EXTRA_WIFI_STATE, WifiManager.WIFI_STATE_DISABLED);

        mWifiTracker.mReceiver.onReceive(mContext, i);

        // Now enable scanning while wifi is off, it shouldn't start.

        mWifiTracker.resumeScanning();

        assertFalse(mWifiTracker.mScanner.isScanning());



        // Turn on wifi and make sure scanning starts.

        i.putExtra(WifiManager.EXTRA_WIFI_STATE, WifiManager.WIFI_STATE_ENABLED);

        mWifiTracker.mReceiver.onReceive(mContext, i);

        assertTrue(mWifiTracker.mScanner.isScanning());

    }



    private String[] generateTestNetworks(List<WifiConfiguration> wifiConfigs,

            List<ScanResult> scanResults, boolean connectedIsEphemeral) {

        String[] expectedSsids = new String[NUM_NETWORKS];