wifi: Remove internal function, add version checks when using new API

1. Remove internal function
2. Add the version check in new APIs which miss it before

Bug: 173791707
Test: S module on R base image boots and connects to wifi and SAP
enable succeed.

Change-Id: Ic9ea9fecfa7d39f54a1875ad687fe21c1381124c

wifi/java/android/net/wifi/SoftApConfiguration.java

@@ -538,15 +538,6 @@ public final class SoftApConfiguration implements Parcelable {
         if (!SdkLevel.isAtLeastS()) {
             throw new UnsupportedOperationException();
         }
-        return getChannelsInternal();
-    }
-
-    /**
-     * Internal version bypassing SdkLevel checks
-     * TODO(b/173791707): find a better way to allow Wifi to call its own new S APIs.
-     * @hide
-     */
-    public @NonNull SparseIntArray getChannelsInternal() {
         return mChannels.clone();
     }
 
@@ -942,6 +933,9 @@ public final class SoftApConfiguration implements Parcelable {
          */
         @NonNull
         public Builder setBands(@NonNull int[] bands) {
+            if (!SdkLevel.isAtLeastS()) {
+                throw new UnsupportedOperationException();
+            }
             if (bands.length == 0 || bands.length > 2) {
                 throw new IllegalArgumentException("Unsupported number of bands("
                         + bands.length + ") configured");
@@ -1030,6 +1024,9 @@ public final class SoftApConfiguration implements Parcelable {
          */
         @NonNull
         public Builder setChannels(@NonNull SparseIntArray channels) {
+            if (!SdkLevel.isAtLeastS()) {
+                throw new UnsupportedOperationException();
+            }
             if (channels.size() == 0 || channels.size() > 2) {
                 throw new IllegalArgumentException("Unsupported number of channels("
                         + channels.size() + ") configured");

wifi/java/android/net/wifi/SoftApInfo.java

@@ -183,15 +183,6 @@ public final class SoftApInfo implements Parcelable {
         if (!SdkLevel.isAtLeastS()) {
             throw new UnsupportedOperationException();
         }
-        return getWifiStandardInternal();
-    }
-
-    /**
-     * Internal version bypassing SdkLevel checks
-     * TODO(b/173791707): find a better way to allow Wifi to call its own new S APIs.
-     * @hide
-     */
-    public @WifiAnnotations.WifiStandard int getWifiStandardInternal() {
         return mWifiStandard;
     }
 

wifi/tests/src/android/net/wifi/SoftApConfigurationTest.java

@@ -20,6 +20,7 @@ import static com.google.common.truth.Truth.assertThat;
 
 import static org.junit.Assert.assertNull;
 import static org.junit.Assert.assertTrue;
+import static org.junit.Assume.assumeTrue;
 
 import android.net.MacAddress;
 import android.os.Parcel;
@@ -371,6 +372,7 @@ public class SoftApConfigurationTest {
 
     @Test
     public void testDualBands() {
+        assumeTrue(SdkLevel.isAtLeastS());
         int[] dual_bands = new int[2];
         dual_bands[0] = SoftApConfiguration.BAND_2GHZ;
         dual_bands[1] = SoftApConfiguration.BAND_5GHZ;
@@ -384,6 +386,7 @@ public class SoftApConfigurationTest {
 
     @Test
     public void testDualChannels() {
+        assumeTrue(SdkLevel.isAtLeastS());
         int[] expected_dual_bands = new int[2];
         expected_dual_bands[0] = SoftApConfiguration.BAND_2GHZ;
         expected_dual_bands[1] = SoftApConfiguration.BAND_5GHZ;
@@ -417,6 +420,7 @@ public class SoftApConfigurationTest {
 
     @Test
     public void testInvalidBandWhenSetBands() {
+        assumeTrue(SdkLevel.isAtLeastS());
         boolean isIllegalArgumentExceptionHappened = false;
         int[] dual_bands = new int[2];
         dual_bands[0] = SoftApConfiguration.BAND_2GHZ;
@@ -457,6 +461,7 @@ public class SoftApConfigurationTest {
 
     @Test
     public void testInvalidConfigWhenSetChannels() {
+        assumeTrue(SdkLevel.isAtLeastS());
         boolean isIllegalArgumentExceptionHappened = false;
         SparseIntArray invalid_channels = new SparseIntArray();
         try {