我构建了一个应用程序，它将按顺序播放音频。带有复选框的列表视图中的选择.. 该应用程序可以很好地播放一个音频，但是当我选择 2 个或更多音频时，该应用程序只会播放最后一个声音.. 我的 logcat 中没有错误..
这是我的主要活动
public class MainActivity extends ListActivity {
private String[] lv_arr = {};
private ListView mainListView = null;
private final String SETTING_TODOLIST = "todolist";
private ArrayList<String> selectedItems = new ArrayList<String>();
private ArrayList<String> nameItems = new ArrayList<String>();
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button btnSave = (Button)findViewById(R.id.btnSave);
btnSave.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
playSound();
}
});
Button btnClear = (Button)findViewById(R.id.btnClear);
btnClear.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
}
});
ArrayList<String> listTODO = PrepareListFromXml();
mainListView = getListView();
mainListView.setCacheColorHint(0);
// bind data with list
lv_arr = (String[])listTODO.toArray(new String[0]);
mainListView.setAdapter(new ArrayAdapter<String>(MainActivity.this, android.R.layout.simple_list_item_multiple_choice, lv_arr));
mainListView.setItemsCanFocus(false);
mainListView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
LoadSelections();
}
private void playSound(){
String nameChoosed = "";
int count = mainListView.getAdapter().getCount();
for (int i=0; i<count; i++){
if(mainListView.isItemChecked(i)){
if(nameChoosed.length()>0){
nameChoosed +=","+mainListView.getItemAtPosition(i);
} else {
nameChoosed += mainListView.getItemAtPosition(i);
}
}
//Toast.makeText(MainActivity.this, nameChoosed, Toast.LENGTH_SHORT).show();
}
Toast.makeText(MainActivity.this, nameChoosed, Toast.LENGTH_SHORT).show();
nameItems.addAll(Arrays.asList(nameChoosed.split(",")));
System.out.println("filenameitems = "+nameItems);
playing(MainActivity.this, nameItems);
}
private void playing(Context context, ArrayList<String> list){
MediaPlayer mp = new MediaPlayer();
CxMediaPlayer cx = new CxMediaPlayer(MainActivity.this);
SoundManager.getInstance();
SoundManager.initSounds(MainActivity.this);
for (int i=0; i<list.size(); i++){
String file = list.get(i);
Log.d("TAG", list.get(i));
//cx.play(file);
SoundManager.getInstance();
SoundManager.initSounds(MainActivity.this);
SoundManager.addSound(i, list.get(i));
SoundManager.playSound(i, 1f);
}
}
private void LoadSelections() {
// if the selections were previously saved load them
SharedPreferences settingsActivity = getPreferences(MODE_PRIVATE);
if (settingsActivity.contains(SETTING_TODOLIST)) {
String savedItems = settingsActivity
.getString(SETTING_TODOLIST, "");
this.selectedItems.addAll(Arrays.asList(savedItems.split(",")));
int count = this.mainListView.getAdapter().getCount();
for (int i = 0; i < count; i++) {
String currentItem = (String) this.mainListView.getAdapter()
.getItem(i);
if (this.selectedItems.contains(currentItem)) {
this.mainListView.setItemChecked(i, true);
}
}
}
}
private ArrayList<String> PrepareListFromXml() {
ArrayList<String> todoItems = new ArrayList<String>();
XmlResourceParser todolistXml = getResources().getXml(R.xml.todolist);
int eventType = -1;
while (eventType != XmlResourceParser.END_DOCUMENT) {
if (eventType == XmlResourceParser.START_TAG) {
String strNode = todolistXml.getName();
if (strNode.equals("item")) {
todoItems.add(todolistXml.getAttributeValue(null, "title"));
}
}
try {
eventType = todolistXml.next();
} catch (XmlPullParserException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return todoItems;
}
}
这在我的 SoundManager 中
static private SoundManager _instance;
private static SoundPool mSoundPool;
private static HashMap<Integer, Integer> mSoundPoolMap;
private static AudioManager mAudioManager;
private static Context mContext;
private static AssetFileDescriptor afd;
private static AssetManager am;
static float streamVolume = 0;
static int index1 = 0;
static float speed1 = 0;
private SoundManager()
{
}
/**
* Requests the instance of the Sound Manager and creates it
* if it does not exist.
*
* @return Returns the single instance of the SoundManager
*/
static synchronized public SoundManager getInstance()
{
if (_instance == null)
_instance = new SoundManager();
return _instance;
}
/**
* Initialises the storage for the sounds
*
* @param theContext The Application context
*/
public static void initSounds(Context theContext)
{
mContext = theContext;
mSoundPool = new SoundPool(4, AudioManager.STREAM_MUSIC, 0);
mSoundPoolMap = new HashMap<Integer, Integer>();
mAudioManager = (AudioManager)mContext.getSystemService(Context.AUDIO_SERVICE);
}
/**
* Add a new Sound to the SoundPool
*
* @param Index - The Sound Index for Retrieval
* @param SoundID - The Android ID for the Sound asset.
*/
public static void addSound(int Index,String SoundID)
{
// mSoundPoolMap.put(Index, mSoundPool.load(mContext, SoundID, 1));
try {
am = mContext.getAssets();
afd = am.openFd(SoundID);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
mSoundPoolMap.put(Index, mSoundPool.load(afd, 1));
}
/**
* Loads the various sound assets
* Currently hardcoded but could easily be changed to be flexible.
*/
public static void loadSounds()
{
// mSoundPoolMap.put(1, mSoundPool.load(mContext, R.raw.starwars, 1));
//mSoundPoolMap.put(2, mSoundPool.load(mContext, R.raw.terminator, 1));
}
/**
* Plays a Sound
*
* @param index - The Index of the Sound to be played
* @param speed - The Speed to play not, not currently used but included for compatibility
*/
public static void playSound(int index,float speed)
{
index1 = index;
speed1 = speed;
streamVolume = mAudioManager.getStreamVolume(AudioManager.STREAM_MUSIC);
streamVolume = streamVolume / mAudioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC);
mSoundPool.setOnLoadCompleteListener(new OnLoadCompleteListener() {
@Override
public void onLoadComplete(SoundPool soundPool, int sampleId, int status) {
// TODO Auto-generated method stub
mSoundPool.play(mSoundPoolMap.get(index1), streamVolume, streamVolume, 1, 0, speed1);
}
});
}
/**
* Stop a Sound
* @param index - index of the sound to be stopped
*/
public static void stopSound(int index)
{
mSoundPool.stop(mSoundPoolMap.get(index));
}
/**
* Deallocates the resources and Instance of SoundManager
*/
public static void cleanup()
{
mSoundPool.release();
mSoundPool = null;
mSoundPoolMap.clear();
mAudioManager.unloadSoundEffects();
_instance = null;
}
我非常需要修复这个存根的帮助..我非常感谢帮助我的人..对不起我的英语不好