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public class MainActivity extends Activity implements SensorEventListener {	private TextToSpeech mSpeech = null;	private Button btn = null;	private Button btnAudio = null;	private AudioManager audioManager;	private SensorManager mSensorManager;	private Sensor mSensor;	private Boolean flag = true;	@Override	protected void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentView(R.layout.main);		btn = (Button) findViewById(R.id.btn);		btn.setOnClickListener(new BtnListener());		btnAudio = (Button) findViewById(R.id.btnAudio);		btnAudio.setOnClickListener(new BtnAudioListener());		mSpeech = new TextToSpeech(MainActivity.this, new TTSListener());		Toast.makeText(MainActivity.this, "start", Toast.LENGTH_SHORT).show();		audioManager = (AudioManager) this.getSystemService(Context.AUDIO_SERVICE);		mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);		mSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_PROXIMITY);		audioManager.setMode(AudioManager.MODE_NORMAL);	}	private class TTSListener implements OnInitListener {		@Override		public void onInit(int status) {			if (status == TextToSpeech.SUCCESS) {				int result = mSpeech.setLanguage(Locale.CHINA);				Toast.makeText(MainActivity.this, "result = " + result,						Toast.LENGTH_LONG).show();				if (result == TextToSpeech.LANG_MISSING_DATA						|| result == TextToSpeech.LANG_NOT_SUPPORTED) {					System.out.println("don't support ");					mSpeech							.speak("don't support Chinese", TextToSpeech.QUEUE_FLUSH, null);				} else {					mSpeech.speak("语音已经准备好", TextToSpeech.QUEUE_FLUSH, null);				}			}		}	}	private class BtnListener implements OnClickListener {		@Override		public void onClick(View v) {			mSpeech.speak("test data", TextToSpeech.QUEUE_FLUSH, null);			mSpeech.speak("12345678", TextToSpeech.QUEUE_ADD, null);			mSpeech.speak("中文语音支持", TextToSpeech.QUEUE_ADD, null);			mSpeech.speak("TTS是android自带的语音合成库，使用方便，效果不错", TextToSpeech.QUEUE_ADD,					null);		}	}	private class BtnAudioListener implements OnClickListener {		@Override		public void onClick(View v) {			if(flag)				flag = false;			else				flag = true;			setMySpeakerphoneOn(flag);			}	}	private void setMySpeakerphoneOn(boolean on) {		if (on) {			audioManager.setSpeakerphoneOn(true);			Toast.makeText(this, "扬声器模式", Toast.LENGTH_LONG).show();			audioManager.setMode(AudioManager.MODE_NORMAL);		} else {			audioManager.setSpeakerphoneOn(false);// 关闭扬声器			Toast.makeText(this, "听筒模式", Toast.LENGTH_LONG).show();      setVolumeControlStream(AudioManager.STREAM_VOICE_CALL);			// 把声音设定成Earpiece（听筒）出来，设定为正在通话中			audioManager.setMode(AudioManager.MODE_IN_COMMUNICATION); //android 5.0+		}	}	@Override	protected void onResume() {		mSensorManager.registerListener(this, mSensor,				SensorManager.SENSOR_DELAY_NORMAL);		super.onResume();	}	@Override	protected void onPause() {		mSensorManager.unregisterListener(this);		super.onPause();	}	@Override	protected void onDestroy() {		if (mSpeech != null) {			mSpeech.stop();			mSpeech.shutdown();			mSpeech = null;		}		audioManager.setSpeakerphoneOn(true);		audioManager.setMode(AudioManager.MODE_NORMAL);		super.onDestroy();	}	@Override	public void onSensorChanged(SensorEvent event) {		float range = event.values[0];		if (range == mSensor.getMaximumRange()) {			audioManager.setSpeakerphoneOn(true);			Toast.makeText(this, "扬声器模式", Toast.LENGTH_LONG).show();			audioManager.setMode(AudioManager.MODE_NORMAL);		} else {			audioManager.setSpeakerphoneOn(false);// 关闭扬声器			Toast.makeText(this, "听筒模式", Toast.LENGTH_LONG).show();			audioManager.setMode(AudioManager.MODE_IN_COMMUNICATION);		}	}	@Override	public void onAccuracyChanged(Sensor sensor, int accuracy) {	}}

权限：

   
       
    
     TTS
        
    
     Settings
        
    
     播报
        
    
     扬声器
        
            
     
      CANADA
             
     
      CHINA
             
     
      CHINESE
             
     
      ENGLISH
             
     
      US