这是utils代码，仅当打开应用程序时，MP3才起作用，一旦单击后退或主页按钮，它就会停止。
如何将其放在后台？
public class Util {
public ArrayList<Contact> getAllContact(Context context) {
ArrayList<Contact> contacts = new ArrayList<Contact>();
Cursor cursor = context.getContentResolver().query(ContactsContract.Contacts.CONTENT_URI, null, null, null, ContactsContract.Contacts.DISPLAY_NAME);
if(cursor != null) {
while (cursor.moveToNext()) {
// This would allow you get several email addresses
// if the email addresses were stored in an array
String name = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));
String id = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts._ID));
String phone = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER));
String aaaa = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts.CUSTOM_RINGTONE));
if (phone!=null && phone.equals("1")) {
Contact contact = new Contact();
contact.setId(Integer.parseInt(id));
contact.setName(name);
contacts.add(contact);
}
}
}
cursor.close();
return contacts;
}
public ArrayList<SongInfo> getAllSong(Context context) {
ArrayList<SongInfo> listSong = new ArrayList<SongInfo>();
RingtonesSharedPreferences pref = new RingtonesSharedPreferences(
context);
Field[] fields = R.raw.class.getFields();
for (int i = 0; i < fields.length - 1; i++) {
SongInfo info = new SongInfo();
try {
String name = fields[i].getName();
if (!name.equals("ringtones")) {
info.setFileName(name + ".mp3");
info.setFavorite(pref.getString(info.getFileName()));
int audioResource = R.raw.class.getField(name).getInt(name);
info.setAudioResource(audioResource);
}
// info.setName(name);
} catch (Exception e) {
// TODO: handle exception
// Log.e("LOG", "Error: " + e.getMessage());
}
listSong.add(info);
}
InputStream inputStream = context.getResources().openRawResource(
R.raw.zeallist);
BufferedReader reader = new BufferedReader(new InputStreamReader(
inputStream));
try {
String line;
int i = 0;
while ((line = reader.readLine()) != null) {
listSong.get(i).setName(line);
i++;
}
} catch (Exception e) {
// TODO: handle exception
} finally {
try {
reader.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return listSong;
}
public void assignRingtoneToContact(Context context, SongInfo info,Contact contact) {
File dir =null;
ContentValues values = new ContentValues();
boolean isRingTone = false;
if (Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED)) {
dir = new File(Environment.getExternalStorageDirectory(),
"Ringtones");
} else {
dir = context.getCacheDir();
}
if (!dir.exists()) {
dir.mkdirs();
}
File file = new File(dir, info.getFileName());
if (!file.exists()) {
try {
file.createNewFile();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
InputStream inputStream = context.getResources()
.openRawResource(info.getAudioResource());
OutputStream outputStream = new FileOutputStream(file);
byte[] buffer = new byte[1024];
int length;
while ((length = inputStream.read(buffer)) > 0) {
outputStream.write(buffer, 0, length);
}
outputStream.flush();
outputStream.close();
inputStream.close();
} catch (Exception e) {
// TODO: handle exception
}
}
String[] columns = { MediaStore.Audio.Media.DATA,
MediaStore.Audio.Media._ID,
MediaStore.Audio.Media.TITLE,
MediaStore.Audio.Media.DISPLAY_NAME,
MediaStore.Audio.Media.IS_RINGTONE
};
Cursor cursor = context.getContentResolver().query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, columns, MediaStore.Audio.Media.DATA+" = '"+file.getAbsolutePath()+"'",null, null);
if (cursor!=null) {
int idColumn = cursor.getColumnIndex(MediaStore.Audio.Media._ID);
int fileColumn = cursor.getColumnIndex(MediaStore.Audio.Media.DATA);
int ringtoneColumn = cursor.getColumnIndex(MediaStore.Audio.Media.IS_RINGTONE);
while (cursor.moveToNext()) {
String audioFilePath = cursor.getString(fileColumn);
if (cursor.getString(ringtoneColumn)!=null && cursor.getString(ringtoneColumn).equals("1")) {
Uri hasUri = MediaStore.Audio.Media.getContentUriForPath(audioFilePath);
Uri fullUri = Uri.withAppendedPath(hasUri, cursor.getString(idColumn));
isRingTone = true;
values.put(ContactsContract.Contacts.CUSTOM_RINGTONE, fullUri.toString());
}
}
cursor.close();
if(!isRingTone){
context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE));
Uri oldUri = MediaStore.Audio.Media.getContentUriForPath(file.getAbsolutePath());
ContentValues Newvalues = new ContentValues();
Uri newUri;
String uriString;
context.getContentResolver().delete(oldUri, MediaStore.MediaColumns.DATA + "=\"" + file.getAbsolutePath() + "\"", null);
Newvalues.put(MediaStore.MediaColumns.DATA, file.getAbsolutePath());
Newvalues.put(MediaStore.MediaColumns.TITLE, info.getName());
Newvalues.put(MediaStore.MediaColumns.SIZE, file.length());
Newvalues.put(MediaStore.MediaColumns.MIME_TYPE, "audio/mp3");
Newvalues.put(MediaStore.Audio.Media.IS_RINGTONE, true);
Uri uri = MediaStore.Audio.Media.getContentUriForPath(file.getAbsolutePath());
newUri = context.getContentResolver().insert(uri, Newvalues);
uriString = newUri.toString();
values.put(ContactsContract.Contacts.CUSTOM_RINGTONE, uriString);
Log.i("LOG", "uriString: " + uriString);
}
}
int count = context.getContentResolver().update(ContactsContract.Contacts.CONTENT_URI, values,ContactsContract.Contacts._ID +" = "+contact.getId(), null);
// Log.i("LOG", "Update: " + count);
}
@SuppressWarnings("deprecation")
public Uri getContactContentUri() {
if(Build.VERSION.SDK_INT >= 5){
return ContactsContract.Contacts.CONTENT_URI;
}
else{
return Contacts.People.CONTENT_URI;
}
}
}
最佳答案
尝试使用MediaPlayer，它有很多选择
MediaPlayer mediaPlayer = new MediaPlayer();
mediaPlayer.setDataSource(context, ringtone);
mediaPlayer.setAudioStreamType(AudioManager.STREAM_ALARM);
mediaPlayer.setLooping(true);
mediaPlayer.prepare();
mediaPlayer.start();
关于android - 我该如何在后台使用此MP3？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/29063557/