Update phi-3 Android app layout and add logs

Author: vraspar

mobile/examples/phi-3/android/app/src/main/java/ai/onnxruntime/genai/demo/MainActivity.java

@@ -55,6 +55,12 @@ protected void onCreate(Bundle savedInstanceState) {
         binding = ActivityMainBinding.inflate(getLayoutInflater());
         setContentView(binding.getRoot());
 
+        sendMsgIB = findViewById(R.id.idIBSend);
+        userMsgEdt = findViewById(R.id.idEdtMessage);
+        generatedTV = findViewById(R.id.sample_text);
+        promptTV = findViewById(R.id.user_text);
+        progressText = findViewById(R.id.progress_text);
+
         // Trigger the download operation when the application is created
         try {
             downloadModels(
@@ -63,10 +69,6 @@ protected void onCreate(Bundle savedInstanceState) {
             throw new RuntimeException(e);
         }
 
-        sendMsgIB = findViewById(R.id.idIBSend);
-        userMsgEdt = findViewById(R.id.idEdtMessage);
-        generatedTV = findViewById(R.id.sample_text);
-        promptTV = findViewById(R.id.user_text);
 
         Consumer<String> tokenListener = this;
 
@@ -99,6 +101,7 @@ public void onClick(View v) {
 
                 // Disable send button while responding to prompt.
                 sendMsgIB.setEnabled(false);
+                sendMsgIB.setAlpha(0.5f);
 
                 promptTV.setText(promptQuestion);
                 // Clear Edit Text or prompt question.
@@ -125,14 +128,22 @@ public void run() {
 
                             generator = new Generator(model, generatorParams);
 
+                            // try to measure average time taken to generate each token.
+                            long startTime = System.currentTimeMillis();
+                            int numTokens = 0;
                             while (!generator.isDone()) {
                                 generator.computeLogits();
                                 generator.generateNextToken();
 
                                 int token = generator.getLastTokenInSequence(0);
 
                                 tokenListener.accept(stream.decode(token));
+                                Log.i(TAG, "Generated token: " + token + ": " +  stream.decode(token));
+                                numTokens++;
                             }
+                            long totalTime = System.currentTimeMillis() - startTime;
+                            Log.i(TAG, "Total time taken to generate + " + numTokens + "tokens: " + totalTime);
+                            Log.i(TAG, "Average time taken to generate each token: " + totalTime / numTokens);
                         }
                         catch (GenAIException e) {
                             Log.e(TAG, "Exception occurred during model query: " + e.getMessage());
@@ -146,6 +157,7 @@ public void run() {
 
                         runOnUiThread(() -> {
                             sendMsgIB.setEnabled(true);
+                            sendMsgIB.setAlpha(1.0f);
                         });
                     }
                 }).start();

mobile/examples/phi-3/android/app/src/main/res/layout/activity_main.xml

@@ -83,4 +83,16 @@
         app:layout_constraintEnd_toEndOf="parent"
         tools:ignore="UseAppTint" />
 
+    <TextView
+        android:id="@+id/progress_text"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="TextView"
+        android:visibility="invisible"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        tools:visibility="invisible" />
+
 </androidx.constraintlayout.widget.ConstraintLayout>