Adding keyboard dismissal when prompt sent (pytorch#6238)

Summary:
Pull Request resolved: pytorch#6238

Dismiss the keyboard when sending the message

Reviewed By: cmodi-meta

Differential Revision: D64413153

fbshipit-source-id: 6f8edb42910c2bac1c0b648814a1856f92a440da

Author: Chester Hu

examples/demo-apps/android/LlamaDemo/app/src/main/java/com/example/executorchllamademo/MainActivity.java

@@ -26,6 +26,7 @@
 import android.system.Os;
 import android.util.Log;
 import android.view.View;
+import android.view.inputmethod.InputMethodManager;
 import android.widget.EditText;
 import android.widget.ImageButton;
 import android.widget.ImageView;
@@ -662,6 +663,12 @@ private void onModelRunStopped() {
     mSendButton.setImageResource(R.drawable.baseline_send_24);
     mSendButton.setOnClickListener(
         view -> {
+          try {
+            InputMethodManager imm = (InputMethodManager) getSystemService(INPUT_METHOD_SERVICE);
+            imm.hideSoftInputFromWindow(getCurrentFocus().getWindowToken(), 0);
+          } catch (Exception e) {
+            ETLogging.getInstance().log("Keyboard dismissal error: " + e.getMessage());
+          }
           addSelectedImagesToChatThread(mSelectedImageUri);
           String finalPrompt;
           String rawPrompt = mEditTextMessage.getText().toString();