我正在开发一个项目，该项目需要在对话框的onClick选项中播放，暂停或停止背景文本到语音。目前它在listview onclick之后正常播放音频，但我无法弄清楚如何暂停或停止正在进行的音频。这是MainActivity代码：
listViewSMS.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0,
View v, int position, long arg3) {
// when user clicks on ListView Item , onItemClick is called
// with position and View of the item which is clicked
// we can use the position parameter to get index of clicked item
TextView textViewSMSSender = (TextView) v.findViewById(R.id.textViewSMSSender);
TextView textViewSMSBody = (TextView) v.findViewById(R.id.textViewMessageBody);
smsSender = textViewSMSSender.getText().toString();//to get the sender in string
smsBody = textViewSMSBody.getText().toString();// content of the sms into string
// Show The Dialog with Selected SMS when particular sms selected
AlertDialog dialog = new AlertDialog.Builder(context).create();
dialog.setTitle("SMS From : " + smsSender);
dialog.setIcon(R.drawable.iltts);
dialog.setMessage(smsBody);
//Dialog box button click event to read the selected sms from the shown list
dialog.setButton(DialogInterface.BUTTON_POSITIVE, "Play",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
Log.d("send", smsSender);
Log.d("body", smsBody + " " + spinnerValue);
//***************############################################28112013
//online part added
MyTask myTask = new MyTask();
myTask.execute(smsBody);
//#############################################################
return;
}
});
dialog.setButton(DialogInterface.BUTTON_NEGATIVE, "Pause", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
//Log.d("send", smsSender);
//Log.d("body", smsBody + " " + spinnerValue);
//***************############################################28112013
//online part added
if(mediaPlayer.isPlaying()){
mediaPlayer.pause();}
//#############################################################
return;
}
}
);
dialog.setButton(DialogInterface.BUTTON_NEUTRAL,"Stop",new DialogInterface.OnClickListener()
{
public void onClick(DialogInterface dialog, int which){
mediaPlayer.stop();
mediaPlayer.release();
}
}
);
dialog.show();
}
});
}
@Override
public void onInit(int status) {
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
}
//ToGo to text to speech engine selection
public void goPreferences(View v)
{
//f=2;
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
}
//Online part with Asynctask ########################################################################################################
private class MyTask extends AsyncTask<String, Void, String>{
@Override
protected void onPreExecute() {
pd=ProgressDialog.show(MainActivity.this,"","Please Wait",false);
}
protected String doInBackground(String... params) {
//Some calculations...
String nt=params[0];
lang=spinnerValue.toLowerCase();
//for bengali hts
if(lang.equals("bengali")){
lang="hts"+lang;
Log.d("bengali language test ********************* ", lang);
}
//for gujarati hts
else if(lang.equals("gujarati")){
lang="hts"+lang+"_male";
Log.d("gujarati language test ********************* ", lang);
}
//for kannada hts
else if(lang.equals("kannada")){
lang="hts"+lang+"_female";
Log.d("kannada language test ********************* ", lang);
}
/* <item>English_Hindi</item>
<item>English_Tamil</item>
<item>English_Telugu</item> */
else if(lang.equals("english_hindi")){
lang="htsenglish";
Log.d("English (hindi) language test ********************* ", lang);
}
//htstelugueng
else if(lang.equals("english_telugu")){
lang="htstelugueng";
Log.d("English (Telugu) language test ********************* ", lang);
}
else if(lang.equals("english_tamil")){
lang="htstamileng";
Log.d("English (Tamil) language test ********************* ", lang);
}
else{
Log.d(" language test ********************* ", lang);
}
//rate
speed=rateselected.toLowerCase();
vc="";
Log.d("language selected now ", lang);
//PART1.1
//link="http://tts.cdacmumbai.in/festival_cs_apps.php"; //amr type v.1.0
//link="http://202.141.151.29/festival_cs_apps.php";
//link="http://iltts.in/festival_cs_apps.php";//2014 Sep 11 v.1.1
link="http://tdil-dc.in/tts/festival_cs_apps.php";//2015 march 14 july 02 v1.4
Log.d("Value of lang" , spinnerValue);
//generating random number
rannum=Math.random();
Log.d("Randum number generated ", Double.toString(rannum));
count=Double.toString(rannum);
Log.d("body from params0", nt);
Log.d("body of smsBody", smsBody);
Log.d("desired url", link);
Log.d("counter", count);
try{
// Creating HTTP client
HttpClient httpClient = new DefaultHttpClient();
// Creating HTTP Post
HttpPost httpPost = new HttpPost(link);
//Name value pair created what you want to send to server
List<NameValuePair> nameValuePair = new ArrayList<NameValuePair>(2);
nameValuePair.add(new BasicNameValuePair("Languages",lang));
nameValuePair.add(new BasicNameValuePair("voice",vc));
nameValuePair.add(new BasicNameValuePair("ex","execute"));
nameValuePair.add(new BasicNameValuePair("op",smsBody));
nameValuePair.add(new BasicNameValuePair("count",count));
nameValuePair.add(new BasicNameValuePair("speed",speed));
//httpPost.setEntity(new UrlEncodedFormEntity(nameValuePair));
httpPost.setEntity(new UrlEncodedFormEntity(nameValuePair, "UTF-8")); // UTF 8 added to send indic string to server
HttpResponse httpResponse = httpClient.execute(httpPost);
final int statusCode = httpResponse.getStatusLine().getStatusCode();
Log.d("Response Status Code",String.valueOf(statusCode));
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//Part1.2
//link2="http://tts.cdacmumbai.in/wav_output/";
//link2="http://202.141.151.29/wav_output/";
//link2="http://iltts.in/wav_output/";//2014 Sep 11 v1.1
link2="http://tdil-dc.in/tts/wav_output/";//2015 March 14 July 02 v 1.4
//file type
file2download=link2+"fest_out"+count+".amr";
Log.d("Now Listen this ",file2download);
return file2download;
}
protected void onPostExecute(String result) {
//Log.d("Listen file in postexecute check and enjoy*********************", result);
pd.dismiss();
String url = result;// your URL here
MediaPlayer mediaPlayer = new MediaPlayer();
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
try {
mediaPlayer.setDataSource(url);
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SecurityException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
mediaPlayer.prepare();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} // might take long! (for buffering, etc)
mediaPlayer.start();
mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mp) {
// TODO Auto-generated method stub
mp.release();
}
});
}//post execute ends
}//MyTask class ends
} // MainActivity结束