Fix NPE on getTitle()

Bug: 199922685
Test: make RunSettingsLibRoboTests -j40
Change-Id: I35bf6f5911dc0ee56e43af7faddaceb479362863
(cherry picked from commit f00f220)
Merged-In: I35bf6f5911dc0ee56e43af7faddaceb479362863
(cherry picked from commit c006ad9)

Author: cnchen

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

@@ -1117,14 +1117,16 @@ public String getSavedNetworkSummary() {
      * Returns the display title for the AccessPoint, such as for an AccessPointPreference's title.
      */
     public String getTitle() {
-        if (isPasspoint()) {
+        if (isPasspoint() && !TextUtils.isEmpty(mConfig.providerFriendlyName)) {
             return mConfig.providerFriendlyName;
-        } else if (isPasspointConfig()) {
+        } else if (isPasspointConfig() && !TextUtils.isEmpty(mProviderFriendlyName)) {
             return mProviderFriendlyName;
-        } else if (isOsuProvider()) {
+        } else if (isOsuProvider() && !TextUtils.isEmpty(mOsuProvider.getFriendlyName())) {
             return mOsuProvider.getFriendlyName();
-        } else {
+        } else if (!TextUtils.isEmpty(getSsidStr())) {
             return getSsidStr();
+        } else {
+            return "";
         }
     }
 

packages/SettingsLib/tests/integ/src/com/android/settingslib/wifi/AccessPointTest.java

@@ -147,6 +147,17 @@ public void testSsidIsSpannableString_returnFalse() {
         assertThat(ssid instanceof SpannableString).isFalse();
     }
 
+    @Test
+    public void testCompareTo_GivesNull() {
+        WifiConfiguration spyConfig = spy(new WifiConfiguration());
+
+        when(spyConfig.isPasspoint()).thenReturn(true);
+        spyConfig.providerFriendlyName = null;
+        AccessPoint passpointAp = new AccessPoint(mContext, spyConfig);
+
+        assertThat(passpointAp.getTitle()).isEqualTo("");
+    }
+
     @Test
     public void testCompareTo_GivesActiveBeforeInactive() {
         AccessPoint activeAp = new TestAccessPointBuilder(mContext).setActive(true).build();