Android: add name for Touch devices and simplification, from bug 3958

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

@@ -741,6 +741,7 @@ public class SDLActivity extends Activity implements View.OnSystemUiVisibilityCh
     public static native String nativeGetHint(String name);
     public static native void nativeSetenv(String name, String value);
     public static native void onNativeOrientationChanged(int orientation);
+    public static native void nativeAddTouch(int touchId, String name);
 
     /**
      * This method is called by SDL using JNI.
@@ -1062,16 +1063,14 @@ public class SDLActivity extends Activity implements View.OnSystemUiVisibilityCh
 
     /**
      * This method is called by SDL using JNI.
-     * @return an array which may be empty but is never null.
      */
-    public static int[] inputGetInputDeviceIds(int sources) {
+    public static void initTouch() {
         int[] ids = InputDevice.getDeviceIds();
-        int[] filtered = new int[ids.length];
+
-        int used = 0;
         for (int i = 0; i < ids.length; ++i) {
             InputDevice device = InputDevice.getDevice(ids[i]);
-            if ((device != null) && ((device.getSources() & sources) != 0)) {
+            if (device != null && (device.getSources() & InputDevice.SOURCE_TOUCHSCREEN) != 0) {
-                filtered[used++] = device.getId();
+                nativeAddTouch(device.getId(), device.getName());
             }
         }
         return Arrays.copyOf(filtered, used);

src/core/android/SDL_android.c

@@ -149,6 +149,10 @@ JNIEXPORT void JNICALL SDL_JAVA_INTERFACE(onNativeOrientationChanged)(
         JNIEnv *env, jclass cls,
         jint orientation);
 
+JNIEXPORT void JNICALL SDL_JAVA_INTERFACE(nativeAddTouch)(
+        JNIEnv* env, jclass cls,
+        jint touchId, jstring name);
+
 /* Java class SDLInputConnection */
 JNIEXPORT void JNICALL SDL_JAVA_INTERFACE_INPUT_CONNECTION(nativeCommitText)(
         JNIEnv *env, jclass cls,
@@ -238,7 +242,7 @@ static jmethodID midIsAndroidTV;
 static jmethodID midIsChromebook;
 static jmethodID midIsDeXMode;
 static jmethodID midManualBackButton;
-static jmethodID midInputGetInputDeviceIds;
+static jmethodID midInitTouch;
 static jmethodID midSendMessage;
 static jmethodID midShowTextInput;
 static jmethodID midIsScreenKeyboardShown;
@@ -366,8 +370,8 @@ JNIEXPORT void JNICALL SDL_JAVA_INTERFACE(nativeSetupJNI)(JNIEnv *mEnv, jclass c
                                 "isDeXMode", "()Z");
     midManualBackButton = (*mEnv)->GetStaticMethodID(mEnv, mActivityClass,
                                 "manualBackButton", "()V");
-    midInputGetInputDeviceIds = (*mEnv)->GetStaticMethodID(mEnv, mActivityClass,
+    midInitTouch = (*mEnv)->GetStaticMethodID(mEnv, mActivityClass,
-                                "inputGetInputDeviceIds", "(I)[I");
+                                "initTouch", "()V");
     midSendMessage = (*mEnv)->GetStaticMethodID(mEnv, mActivityClass,
                                 "sendMessage", "(II)Z");
     midShowTextInput =  (*mEnv)->GetStaticMethodID(mEnv, mActivityClass,
@@ -396,7 +400,7 @@ JNIEXPORT void JNICALL SDL_JAVA_INTERFACE(nativeSetupJNI)(JNIEnv *mEnv, jclass c
 
 
     if (!midGetNativeSurface || !midSetSurfaceViewFormat ||
-       !midSetActivityTitle || !midSetWindowStyle || !midSetOrientation || !midGetContext || !midIsTablet || !midIsAndroidTV || !midInputGetInputDeviceIds ||
+       !midSetActivityTitle || !midSetWindowStyle || !midSetOrientation || !midGetContext || !midIsTablet || !midIsAndroidTV || !midInitTouch ||
        !midSendMessage || !midShowTextInput || !midIsScreenKeyboardShown ||
        !midClipboardSetText || !midClipboardGetText || !midClipboardHasText ||
        !midOpenAPKExpansionInputStream || !midGetManifestEnvironmentVariables || !midGetDisplayDPI ||
@@ -596,6 +600,17 @@ JNIEXPORT void JNICALL SDL_JAVA_INTERFACE(onNativeOrientationChanged)(
     }
 }
 
+JNIEXPORT void JNICALL SDL_JAVA_INTERFACE(nativeAddTouch)(
+        JNIEnv* env, jclass cls,
+        jint touchId, jstring name)
+{
+    const char *utfname = (*env)->GetStringUTFChars(env, name, NULL);
+
+    SDL_AddTouch((SDL_TouchID) touchId, SDL_TOUCH_DEVICE_DIRECT, utfname);
+
+    (*env)->ReleaseStringUTFChars(env, name, utfname);
+}
+
 /* Paddown */
 JNIEXPORT jint JNICALL SDL_JAVA_CONTROLLER_INTERFACE(onNativePadDown)(
                                     JNIEnv *env, jclass jcls,
@@ -2074,29 +2089,10 @@ int Android_JNI_GetPowerInfo(int *plugged, int *charged, int *battery, int *seco
     return 0;
 }
 
-/* returns number of found touch devices as return value and ids in parameter ids */
+/* Add all touch devices */
-int Android_JNI_GetTouchDeviceIds(int **ids) {
+int Android_JNI_InitTouch() {
      JNIEnv *env = Android_JNI_GetEnv();
-    jint sources = 4098; /* == InputDevice.SOURCE_TOUCHSCREEN */
+    (*env)->CallStaticVoidMethod(env, mActivityClass, midInitTouch);
-    jintArray array = (jintArray) (*env)->CallStaticObjectMethod(env, mActivityClass, midInputGetInputDeviceIds, sources);
-    int number = 0;
-    *ids = NULL;
-    if (array) {
-        number = (int) (*env)->GetArrayLength(env, array);
-        if (0 < number) {
-            jint *elements = (*env)->GetIntArrayElements(env, array, NULL);
-            if (elements) {
-                int i;
-                *ids = SDL_malloc(number * sizeof (**ids));
-                for (i = 0; i < number; ++i) { /* not assuming sizeof (jint) == sizeof (int) */
-                    (*ids)[i] = elements[i];
-                }
-                (*env)->ReleaseIntArrayElements(env, array, elements, JNI_ABORT);
-            }
-        }
-        (*env)->DeleteLocalRef(env, array);
-    }
-    return number;
 }
 
 /* sets the mSeparateMouseAndTouch field */

src/core/android/SDL_android.h

@@ -95,7 +95,6 @@ void Android_JNI_SuspendScreenSaver(SDL_bool suspend);
 /* Touch support */
 int Android_JNI_InitTouch(void);
 void Android_JNI_SetSeparateMouseAndTouch(SDL_bool new_value);
-int Android_JNI_GetTouchDeviceIds(int **ids);
 
 /* Threads */
 #include <jni.h>

src/video/android/SDL_androidtouch.c

@@ -63,19 +63,11 @@ SeparateEventsHintWatcher(void *userdata, const char *name,
 
 void Android_InitTouch(void)
 {
-    int i;
-    int *ids;
-    const int number = Android_JNI_GetTouchDeviceIds(&ids);
-
     SDL_AddHintCallback(SDL_HINT_ANDROID_SEPARATE_MOUSE_AND_TOUCH,
                         SeparateEventsHintWatcher, NULL);
 
-    if (0 < number) {
+    /* Add all touch devices */
-        for (i = 0; i < number; ++i) {
+    Android_JNI_InitTouch();
-            SDL_AddTouch((SDL_TouchID) ids[i], SDL_TOUCH_DEVICE_DIRECT, ""); /* no error handling */
-        }
-        SDL_free(ids);
-    }
 }
 
 void Android_QuitTouch(void)