Java tutorial
/* * Copyright 2017 Google Inc. All Rights Reserved. * * 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.google.cloud.android.dialogflow; import android.Manifest; import android.content.ComponentName; import android.content.Intent; import android.content.ServiceConnection; import android.content.pm.PackageManager; import android.os.Bundle; import android.os.IBinder; import android.support.annotation.NonNull; import android.support.annotation.VisibleForTesting; import android.support.v4.app.ActivityCompat; import android.support.v7.app.AppCompatActivity; import android.support.v7.widget.DefaultItemAnimator; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.RecyclerView; import android.widget.EditText; import android.widget.ImageButton; import com.google.cloud.android.dialogflow.api.DialogflowService; import com.google.cloud.android.dialogflow.api.Utterance; import com.google.cloud.android.dialogflow.ui.AudioIndicatorView; import com.google.cloud.android.dialogflow.ui.HistoryAdapter; import com.google.cloud.android.dialogflow.ui.InputHelper; import com.google.cloud.android.dialogflow.ui.MessageDialogFragment; public class MainActivity extends AppCompatActivity { private static final String FRAGMENT_MESSAGE_DIALOG = "message_dialog"; private static final int REQUEST_RECORD_AUDIO_PERMISSION = 1; private static final String STATE_HISTORY = "history"; @VisibleForTesting DialogflowService mDialogflowService; private LinearLayoutManager mLayoutManager; private HistoryAdapter mAdapter; private InputHelper mInputHelper; private final ServiceConnection mServiceConnection = new ServiceConnection() { @Override public void onServiceConnected(ComponentName componentName, IBinder binder) { mDialogflowService = DialogflowService.from(binder); mDialogflowService.addListener(mSpeechServiceListener); } @Override public void onServiceDisconnected(ComponentName componentName) { mDialogflowService = null; } }; private DialogflowService.Listener mSpeechServiceListener = new DialogflowService.Listener() { @Override public void onApiReady() { mInputHelper.setEnabled(true); } @Override public void onNewUtterance(Utterance utterance) { if (mInputHelper != null && utterance.direction == Utterance.OUTGOING) { mInputHelper.showTranscript(null); } mAdapter.addUtterance(utterance); mLayoutManager.scrollToPosition(mAdapter.getItemCount() - 1); } @Override public void onNewRecognition(String text) { if (mInputHelper != null) { mInputHelper.showTranscript(text); } } }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // The main conversation view final RecyclerView history = findViewById(R.id.history); history.setItemAnimator(new DefaultItemAnimator()); mLayoutManager = new LinearLayoutManager(this); mLayoutManager.setStackFromEnd(true); history.setLayoutManager(mLayoutManager); mAdapter = new HistoryAdapter(); if (savedInstanceState != null) { mAdapter.restoreHistory(savedInstanceState.<Utterance>getParcelableArrayList(STATE_HISTORY)); } history.setAdapter(mAdapter); // User input mInputHelper = new InputHelper((EditText) findViewById(R.id.text), (ImageButton) findViewById(R.id.toggle), (AudioIndicatorView) findViewById(R.id.indicator), new InputHelper.Callback() { @Override public void onText(String text) { if (mDialogflowService != null) { mDialogflowService.detectIntentByText(text); } } @Override public void onVoiceStart() { if (mDialogflowService != null) { mDialogflowService.startDetectIntentByVoice(mInputHelper.getSampleRate()); } } @Override public void onVoice(byte[] data, int size) { if (mDialogflowService != null) { mDialogflowService.detectIntentByVoice(data, size); } } @Override public void onVoiceEnd() { if (mDialogflowService != null) { mDialogflowService.finishDetectIntentByVoice(); } } @Override public boolean ensureRecordAudioPermission() { if (ActivityCompat.checkSelfPermission(MainActivity.this, Manifest.permission.RECORD_AUDIO) == PackageManager.PERMISSION_GRANTED) { return true; } else if (ActivityCompat.shouldShowRequestPermissionRationale(MainActivity.this, Manifest.permission.RECORD_AUDIO)) { showPermissionMessageDialog(); } else { ActivityCompat.requestPermissions(MainActivity.this, new String[] { Manifest.permission.RECORD_AUDIO }, REQUEST_RECORD_AUDIO_PERMISSION); } return false; } }); } @Override protected void onDestroy() { mInputHelper.release(); super.onDestroy(); } @Override protected void onStart() { super.onStart(); // Prepare Cloud Conversation Engine bindService(new Intent(this, DialogflowService.class), mServiceConnection, BIND_AUTO_CREATE); } @Override protected void onStop() { // Stop Cloud Conversation Engine if (mDialogflowService != null) { mDialogflowService.removeListener(mSpeechServiceListener); unbindService(mServiceConnection); mDialogflowService = null; } super.onStop(); } @Override public void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); if (mAdapter != null) { outState.putParcelableArrayList(STATE_HISTORY, mAdapter.getHistory()); } } @Override public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) { if (requestCode == REQUEST_RECORD_AUDIO_PERMISSION) { if (permissions.length == 1 && grantResults.length == 1 && grantResults[0] == PackageManager.PERMISSION_GRANTED) { mInputHelper.resumeAudio(); } else { mInputHelper.fallbackToText(); } } else { super.onRequestPermissionsResult(requestCode, permissions, grantResults); } } private void showPermissionMessageDialog() { MessageDialogFragment.newInstance(getString(R.string.permission_message)).show(getSupportFragmentManager(), FRAGMENT_MESSAGE_DIALOG); } }