Android文本语音API开发教程
Android 7.0 提供了 TextToSpeech API,可以方便地实现将文本转化为语音的功能。借助于 TextToSpeech API,企业可以很容易地开发出自己的基于文本的语音播放应用程序。
TextToSpeechDemo 是一个使用 TextToSpeech API 进行文本语音播放的实例,修改自 Android SDK 自带的 Demo 实例,其运行效果如图 1 所示。点击 speak 按钮就可以将按钮下方显示的文本内容以语音方式播放出来。
图 1 文本语音播放
其布局文件 text_to_speech.xml 的内容如下:
TextToSpeech 实例通过 speak 方法即可进行语音播放。本实例是以随机顺序播放 HELLOS 中的字符串的。
目前,该功能对英文支持较好,暂不支持中文文本播放。
TextToSpeechDemo 是一个使用 TextToSpeech API 进行文本语音播放的实例,修改自 Android SDK 自带的 Demo 实例,其运行效果如图 1 所示。点击 speak 按钮就可以将按钮下方显示的文本内容以语音方式播放出来。
图 1 文本语音播放
其布局文件 text_to_speech.xml 的内容如下:
<?xml version="l.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <Button android:id="@+id/again_button" android:layout_width="wrap_content" android:layout_height="wrap_content" android:enabled="false" android:text="speak" /> <TextView android:id="@+id/textView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Large Text" android:textAppearance="?android:attr/textAppearanceLarge" /> </LinearLayout>实例 TextToSpeechDemo 中 TextToSpeechActivity.java 的代码如下:
package introduction.android.texttospeechdemo; import java.util.Locale; import java.util.Random; import android.app.Activity; import android.os.Bundle; import android.speech.tts.TextToSpeech; import android.util.Log; import android.view.View; import android.widget.Button; import android.widget.TextView; public class TextToSpeechActivity extends Activity implements TextToSpeech.OnInitListener { private static final String TAG = "TextToSpeechDemo"; private TextToSpeech mTts; private Button mAgainButton; private TextView tv; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_text_to_speech); // Initialize text-to-speech. This is an asynchronous operation. // The OnInitListener (second argument) is called after initialization completes. mTts = new TextToSpeech(this, this// TextToSpeech.OnInitListener ); tv = (TextView) this.findViewById(R.id.textView1); // The button is disabled in the layout. // It will be enabled upon initialization of the TTS engine. mAgainButton = (Button) findViewById(R.id.again_button); mAgainButton.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { sayHello(); } }); } @Override public void onDestroy() { // Don't forget to shutdown! if (mTts != null) { mTts.stop(); mTts.shutdown(); } super.onDestroy(); } // Implements TextToSpeech.OnInitListener. public void onInit(int status) { // status can be either TextToSpeech.SUCCESS or TextToSpeech.ERROR. if (status == TextToSpeech.SUCCESS) { // Set preferred language to US english. // Note that a language may not be available, and the result will indicate this, int result = mTts.setLanguage(Locale.US); // Try this someday for some interesting results. // int result mTts.setLanguage(Locale.FRANCE); if (result == TextToSpeech.LANG_MISSING_DATA || result == TextToSpeech.LANG_NOT_SUPPORTED) { // Lanuage data is missing or the language is not supported. Log.e(TAG, "Language is not available."); } else { // Check the documentation for other possible result codes. // For example, the language may be available for the locale, // but not for the specified country and variant. // The TTS engine has been successfully initialized. // Allow the user to press the button for the app to speak again. mAgainButton.setEnabled(true); // Greet the user. sayHello(); } } else { // Initialization failed. Log.e(TAG, "Could not initialize TextToSpeech."); } } private static final Random RANDOM = new Random(); private static final String[] HELLOS = { "Hello", "Congratulation", "Greetings", "How are you!", "What's your name?", "I am a good student!", "Oh My God!" }; private void sayHello() { // Select a random hello. int helloLength = HELLOS.length; String hello = HELLOS[RANDOM.nextInt(helloLength)]; mTts.speak(hello, TextToSpeech.QUEUE_FLUSH, // Drop all pending entries in the playback queue, null); tv.setText(hello); } }在这段内码中:
private static final String[] HELLOS = { "Hello", "Congratulation", "Greetings", "How are you!", "What's your name?", "I am a good student!", "Oh My God!" };HELLOS 数组中存放了用于播放的文本,读者如果想播放自己的文本,只需要替换该数组内的字符串即可。
mTts = new TextToSpeech(this,this);
创建了 TextToSpeech 实例 mTts,该构造方法的第一个参数表示容纳该对象的容器,第二个参数表示实现文本语音回调接口 TextToSpeech.OnInitListener 的类,该接口提供一个 public void onInit(int status) 方法,用于对文本语音 API 进行初始化。TextToSpeech 实例通过 speak 方法即可进行语音播放。本实例是以随机顺序播放 HELLOS 中的字符串的。
目前,该功能对英文支持较好,暂不支持中文文本播放。
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