First stab at a sample voice recognition service to show the skeleton for how

to set up such a thing and expose its settings activity, etc.

samples/VoiceRecognitionService/src/com/example/android/voicerecognitionservice/VoiceRecognitionService.java

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+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.example.android.voicerecognitionservice;
+
+import java.util.ArrayList;
+
+import android.content.Context;
+import android.content.Intent;
+import android.content.SharedPreferences;
+import android.os.Bundle;
+import android.os.RemoteException;
+import android.speech.RecognitionManager;
+import android.speech.RecognitionService;
+
+/**
+ * A sample implementation of a {@link RecognitionService}. This very simple implementation does
+ * no actual voice recognition. It just immediately returns fake recognition results.
+ * Depending on the setting chosen in {@link VoiceRecognitionSettings}, it either returns a
+ * list of letters ("a", "b", "c"), or a list of numbers ("1", "2", "3").
+ */
+public class VoiceRecognitionService extends RecognitionService {
+
+    @Override
+    protected void onCancel(Callback listener) {
+        // A real recognizer would do something to shut down recognition here.
+    }
+
+    @Override
+    protected void onStartListening(Intent recognizerIntent, Callback listener) {
+        // A real recognizer would probably utilize a lot of the other listener callback
+        // methods. But we'll just skip all that and pretend we've got a result.
+        ArrayList<String> results = new ArrayList<String>();
+        
+        SharedPreferences prefs = getSharedPreferences(
+                VoiceRecognitionSettings.SHARED_PREFERENCES_NAME,
+                Context.MODE_PRIVATE);
+        
+        String resultType = prefs.getString(
+                VoiceRecognitionSettings.PREF_KEY_RESULTS_TYPE,
+                String.valueOf(VoiceRecognitionSettings.RESULT_TYPE_LETTERS));
+        int resultTypeInt = Integer.parseInt(resultType);
+        
+        if (resultTypeInt == VoiceRecognitionSettings.RESULT_TYPE_LETTERS) {
+            results.add("a");
+            results.add("b");
+            results.add("c");            
+        } else if (resultTypeInt == VoiceRecognitionSettings.RESULT_TYPE_NUMBERS) {
+            results.add("1");
+            results.add("2");
+            results.add("3");
+        }
+        
+        Bundle bundle = new Bundle();
+        bundle.putStringArrayList(RecognitionManager.RESULTS_RECOGNITION, results);
+        
+        try {
+            listener.results(bundle);
+        } catch (RemoteException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    @Override
+    protected void onStopListening(Callback listener) {
+        // Not implemented - in this sample we assume recognition would be endpointed
+        // automatically, though certain applications may wish to expose an affordance
+        // for stopping recording manually.
+    }
+    
+}

samples/VoiceRecognitionService/src/com/example/android/voicerecognitionservice/VoiceRecognitionSettings.java

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+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+package com.example.android.voicerecognitionservice;
+
+import android.os.Bundle;
+import android.preference.PreferenceActivity;
+
+/**
+ * A settings activity for the sample voice recognizer.
+ */
+public class VoiceRecognitionSettings extends PreferenceActivity {
+    
+    // The name of the SharedPreferences file we'll store preferences in.
+    public static final String SHARED_PREFERENCES_NAME = "VoiceRecognitionService";
+    
+    // The key to the preference for the type of results to show (letters or numbers).
+    // Identical to the value specified in res/values/strings.xml.
+    public static final String PREF_KEY_RESULTS_TYPE = "results_type";
+    
+    // The values of the preferences for the type of results to show (letters or numbers).
+    // Identical to the values specified in res/values/strings.xml.
+    public static final int RESULT_TYPE_LETTERS = 0;
+    public static final int RESULT_TYPE_NUMBERS = 1;
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        getPreferenceManager().setSharedPreferencesName(SHARED_PREFERENCES_NAME);
+        addPreferencesFromResource(R.xml.preferences);
+    }
+}