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We need a field to hold the special text that we ll record with the TTS engine into a sound file. We supply the file name in the layout as well. Finally, we need to associate our sound file to the actual string we want the sound file to play for. Now let s look at the Java code for our MainActivity (see Listing 15 4). In the onCreate() method, we set up button click handlers for the Speak, Play, Record, and Associate buttons, then we initiate the TTS engine using an intent. The rest of the code consists of callbacks to handle the result from the intent that checks for a properly set up TTS engine, to handle the initialization result from the TTS engine, and the normal callbacks for pausing and shutting down our activity.

Although these functions work with any channel, their output might not make sense with every channel. This is especially true of the position functions. A device that cannot report a location or size cannot report it sensibly, even if the function returns. It is up to you to know whether the channel you re operating on makes sense for these functions.

8, Building and Consuming Services This chapter is about building background services in Android. Here, we talk about building services that are local to your application, as well as remote services services that can be consumed by other applications running on the device. Remote services are based on Android Interface Definition Language (AIDL), so we show you how to define AIDL types and files. We also describe how to pass types across process boundaries.

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Listing 15 4. Java Code to Demonstrate Saved Audio for Text import import import import import import import import import import import import import java.io.File; android.app.Activity; android.content.Intent; android.media.MediaPlayer; android.os.Bundle; android.speech.tts.TextToSpeech; android.speech.tts.TextToSpeech.OnInitListener; android.util.Log; android.view.View; android.view.View.OnClickListener; android.widget.Button; android.widget.EditText; android.widget.Toast;

public class MainActivity extends Activity implements OnInitListener { private EditText words = null; private Button speakBtn = null; private EditText filename = null;

There are three functions for opening input channels from files, which are really just one function with arguments already set. Channels are buffered in OCaml. Using your favorite text editor, you should create a file containing some text. Remember to note the path to this file; you ll be using it for the following examples. The file will be called c:\temp\testfile and will contain the following: hello there world First, you create a function that prints out the contents of a file. let catfile filename = let rec print_all_lines in_chan = output_string stdout ((input_line in_chan) ^ "\n"); print_all_lines in_chan in let in_file = open_in filename in try print_all_lines in_file with End_of_file -> close_in in_file;;

9, Using the Media Framework and Telephony APIs This chapter shows you how to build media-capable applications with the Android SDK. We talk about playing audio and video and then show you how to record audio. We cover text messaging in the telephony part of the chapter.

Button recordBtn = null; Button playBtn = null; EditText useWith = null; Button assocBtn = null; String soundFilename = null; File soundFile = null; static final int REQ_TTS_STATUS_CHECK = 0; static final String TAG = "TTS Demo"; TextToSpeech mTts = null; MediaPlayer player = null;

/** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); words = (EditText)findViewById(R.id.wordsToSpeak); filename = (EditText)findViewById(R.id.filename); useWith = (EditText)findViewById(R.id.realText); speakBtn = (Button)findViewById(R.id.speakBtn); speakBtn.setOnClickListener(new OnClickListener() { @Override public void onClick(View view) { mTts.speak(words.getText().toString(), TextToSpeech.QUEUE_ADD, null); }}); recordBtn = (Button)findViewById(R.id.recordBtn); recordBtn.setOnClickListener(new OnClickListener() { @Override public void onClick(View view) { soundFilename = filename.getText().toString(); soundFile = new File(soundFilename); if (soundFile.exists()) soundFile.delete(); if(mTts.synthesizeToFile(words.getText().toString(), null, soundFilename) == TextToSpeech.SUCCESS) { Toast.makeText(getBaseContext(), "Sound file created", Toast.LENGTH_SHORT).show(); playBtn.setEnabled(true); assocBtn.setEnabled(true); } else { Toast.makeText(getBaseContext(), "Oops! Sound file not created", Toast.LENGTH_SHORT).show(); } }}); playBtn = (Button)findViewById(R.id.playBtn); playBtn.setOnClickListener(new OnClickListener() { @Override public void onClick(View view) {

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