Backends: SDL2: restore SDL_StartTextInput()/SDL_StopTextInput() calls on Android (#7636, #9474)

Author: Turtle-PB

backends/imgui_impl_android.cpp

@@ -24,6 +24,7 @@
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
 //  2026-07-15: Inputs: clear mouse position on touch release (AMOTION_EVENT_ACTION_UP) to prevent items from staying in hovered state. (#6627, #9474)
+//  2023-04-11: Inputs: calling new io.AddMouseSourceEvent() to discriminate Mouse from Touch events.
 //  2022-09-26: Inputs: renamed ImGuiKey_ModXXX introduced in 1.87 to ImGuiMod_XXX (old names still supported).
 //  2022-01-26: Inputs: replaced short-lived io.AddKeyModsEvent() (added two weeks ago) with io.AddKeyEvent() using ImGuiKey_ModXXX flags. Sorry for the confusion.
 //  2022-01-17: Inputs: calling new io.AddMousePosEvent(), io.AddMouseButtonEvent(), io.AddMouseWheelEvent() API (1.87+).

backends/imgui_impl_sdl2.cpp

@@ -21,6 +21,7 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
+//  2026-07-15: Inputs: restore SDL_StartTextInput()/SDL_StopTextInput() in IME handler for on-screen keyboard support on Android/mobile. (#7636, #9474)
 //  2026-04-16: Made ImGui_ImplSDL2_GetContentScaleForWindow(), ImGui_ImplSDL2_GetContentScaleForDisplay() helpers return a minimum of 1.0f, as some Linux setup seems to report <1.0f value and this breaks scaling border size. (#9369)
 //  2026-02-13: Inputs: systems other than X11 are back to starting mouse capture on mouse down (reverts 2025-02-26 change). Only X11 requires waiting for a drag by default (not ideal, but a better default for X11 users). Added ImGui_ImplSDL2_SetMouseCaptureMode() for X11 debugger users. (#3650, #6410, #9235)
 //  2026-01-15: Changed GetClipboardText() handler to return nullptr on error aka clipboard contents is not text. Consistent with other backends. (#9168)
@@ -205,6 +206,18 @@ static void ImGui_ImplSDL2_PlatformSetImeData(ImGuiContext*, ImGuiViewport*, ImG
         r.w = 1;
         r.h = (int)data->InputLineHeight;
         SDL_SetTextInputRect(&r);
+
+#ifdef __ANDROID__
+        // SDL_StartTextInput() is needed on Android (and some other platforms) to show the on-screen keyboard. (#7636, #9474, #6306)
+        // It was removed in a7703fe6 due to concerns about its relation to desktop IME, but is required on mobile.
+        SDL_StartTextInput();
+#endif
+    }
+    else
+    {
+#ifdef __ANDROID__
+        SDL_StopTextInput();
+#endif
     }
 }
 

docs/CHANGELOG.txt

@@ -151,8 +151,8 @@ Other Changes:
   - Added IM_DEBUG_BREAK() handler for GCC+AArch64/ARM64. [@tom-seddon]
 - Backends:
   - Android:
-     - Clear mouse position on touch release (AMOTION_EVENT_ACTION_UP) to prevent
-       items from staying in hovered state. (#6627, #9474) [@Turtle-PB]
+    - Clear mouse position on touch release (AMOTION_EVENT_ACTION_UP) to prevent
+      items from staying in hovered state. (#6627, #9474) [@Turtle-PB]
   - Metal4:
     - Added new Metal 4 backend (forked from Metal 3 backend). (#9458, #9451) [@AmelieHeinrich]
     - Added Metal-cpp support enabled with `IMGUI_IMPL_METAL_CPP` define. (#9461) [@MERL10N]
@@ -161,6 +161,9 @@ Other Changes:
       Fixes an issue running on macOS with Wine. [#9427, #6577) [@perminovVS]
     - Expose selected render state in ImGui_ImplOpenGL3_RenderState, allowing to
       dynamically select between use of glBindSampler() and glTexParameter(). (#9378)
+  - SDL2:
+    - Restore SDL_StartTextInput()/SDL_StopTextInput() in IME handler for on-screen keyboard
+      support on Android. (#7636, #9474) [@Turtle-PB]
   - SDLRenderer3:
     - Fixed sampler change which didn't work on all graphics backends. (#7616, #9470, #9378)
     - Fixed default sampler not being Linear. Regression in 1.92.8. (#7616, #9470, #9378) [@ShiroKSH]