Use numeric codes for Android versions, to avoid SDK dependencies

(cherry picked from commit 3f6b2d1a61d0c0dcd6af7cc951c1d8c267ed1526)

android-project/app/src/main/java/org/libsdl/app/SDLActivity.java

@@ -93,7 +93,7 @@ public class SDLActivity extends Activity implements View.OnSystemUiVisibilityCh
 
         s2 = s_copy & InputDevice.SOURCE_ANY; // keep source only, no class;
 
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
+        if (Build.VERSION.SDK_INT >= 23) {
             tst = InputDevice.SOURCE_BLUETOOTH_STYLUS;
             if ((s & tst) == tst) src += " BLUETOOTH_STYLUS";
             s2 &= ~tst;
@@ -107,7 +107,7 @@ public class SDLActivity extends Activity implements View.OnSystemUiVisibilityCh
         if ((s & tst) == tst) src += " GAMEPAD";
         s2 &= ~tst;
 
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
+        if (Build.VERSION.SDK_INT >= 21) {
             tst = InputDevice.SOURCE_HDMI;
             if ((s & tst) == tst) src += " HDMI";
             s2 &= ~tst;
@@ -146,7 +146,7 @@ public class SDLActivity extends Activity implements View.OnSystemUiVisibilityCh
         if ((s & tst) == tst) src += " TOUCHSCREEN";
         s2 &= ~tst;
 
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2) {
+        if (Build.VERSION.SDK_INT >= 18) {
             tst = InputDevice.SOURCE_TOUCH_NAVIGATION;
             if ((s & tst) == tst) src += " TOUCH_NAVIGATION";
             s2 &= ~tst;

android-project/app/src/main/java/org/libsdl/app/SDLAudioManager.java

@@ -29,7 +29,7 @@ public class SDLAudioManager {
         mAudioRecord = null;
         mAudioDeviceCallback = null;
 
-        if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.N)
+        if(Build.VERSION.SDK_INT >= 24)
         {
             mAudioDeviceCallback = new AudioDeviceCallback() {
                 @Override
@@ -237,7 +237,7 @@ public class SDLAudioManager {
                     return null;
                 }
 
-                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N && deviceId != 0) {
+                if (Build.VERSION.SDK_INT >= 24 && deviceId != 0) {
                     mAudioRecord.setPreferredDevice(getOutputAudioDeviceInfo(deviceId));
                 }
 
@@ -264,7 +264,7 @@ public class SDLAudioManager {
                     return null;
                 }
 
-                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N && deviceId != 0) {
+                if (Build.VERSION.SDK_INT >= 24 && deviceId != 0) {
                     mAudioTrack.setPreferredDevice(getInputAudioDeviceInfo(deviceId));
                 }
 
@@ -283,7 +283,7 @@ public class SDLAudioManager {
     }
 
     private static AudioDeviceInfo getInputAudioDeviceInfo(int deviceId) {
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
+        if (Build.VERSION.SDK_INT >= 24) {
             AudioManager audioManager = (AudioManager) mContext.getSystemService(Context.AUDIO_SERVICE);
             return Arrays.stream(audioManager.getDevices(AudioManager.GET_DEVICES_INPUTS))
                     .filter(deviceInfo -> deviceInfo.getId() == deviceId)
@@ -295,7 +295,7 @@ public class SDLAudioManager {
     }
 
     private static AudioDeviceInfo getOutputAudioDeviceInfo(int deviceId) {
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
+        if (Build.VERSION.SDK_INT >= 24) {
             AudioManager audioManager = (AudioManager) mContext.getSystemService(Context.AUDIO_SERVICE);
             return Arrays.stream(audioManager.getDevices(AudioManager.GET_DEVICES_OUTPUTS))
                     .filter(deviceInfo -> deviceInfo.getId() == deviceId)
@@ -307,14 +307,14 @@ public class SDLAudioManager {
     }
 
     private static void registerAudioDeviceCallback() {
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
+        if (Build.VERSION.SDK_INT >= 24) {
             AudioManager audioManager = (AudioManager) mContext.getSystemService(Context.AUDIO_SERVICE);
             audioManager.registerAudioDeviceCallback(mAudioDeviceCallback, null);
         }
     }
 
     private static void unregisterAudioDeviceCallback(Context context) {
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
+        if (Build.VERSION.SDK_INT >= 24) {
             AudioManager audioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
             audioManager.unregisterAudioDeviceCallback(mAudioDeviceCallback);
         }
@@ -324,7 +324,7 @@ public class SDLAudioManager {
      * This method is called by SDL using JNI.
      */
     public static int[] getAudioOutputDevices() {
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
+        if (Build.VERSION.SDK_INT >= 24) {
             AudioManager audioManager = (AudioManager) mContext.getSystemService(Context.AUDIO_SERVICE);
             return Arrays.stream(audioManager.getDevices(AudioManager.GET_DEVICES_OUTPUTS)).mapToInt(AudioDeviceInfo::getId).toArray();
         } else {
@@ -336,7 +336,7 @@ public class SDLAudioManager {
      * This method is called by SDL using JNI.
      */
     public static int[] getAudioInputDevices() {
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
+        if (Build.VERSION.SDK_INT >= 24) {
             AudioManager audioManager = (AudioManager) mContext.getSystemService(Context.AUDIO_SERVICE);
             return Arrays.stream(audioManager.getDevices(AudioManager.GET_DEVICES_INPUTS)).mapToInt(AudioDeviceInfo::getId).toArray();
         } else {
@@ -360,7 +360,7 @@ public class SDLAudioManager {
             return;
         }
 
-        if (android.os.Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.LOLLIPOP) {
+        if (android.os.Build.VERSION.SDK_INT < 21) {
             Log.e(TAG, "Attempted to make an incompatible audio call with uninitialized audio! (floating-point output is supported since Android 5.0 Lollipop)");
             return;
         }