我试图弄清楚如何在我的媒体播放器准备流文件时显示“正在加载。请稍候...”的进度条。现在发生的事情是在歌曲准备好后显示。我怎样才能解决这个问题？
mediaPlayerLoadingBar =ProgressDialog.show(PlaylistActivity.this, "", "Loading. Please wait...", true);
/*dubstep stream*/
try {
dubstepMediaPlayer.setDataSource(dubstepPlaylistString[0]);
dubstepMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
dubstepMediaPlayer.prepare();
} 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();
}
dubstepMediaPlayer.start();
if(dubstepMediaPlayer.isPlaying()){
mediaPlayerLoadingBar.dismiss();
}`
编辑：
这是我现在的代码：
`开关（pSelection）{
情况1：
new AsyncTask<Void, Void, Void>(){
@Override
protected void onPreExecute(){
mediaPlayerLoadingBar =ProgressDialog.show(PlaylistActivity.this, "", "Loading. Please wait...", true);
try {
dubstepMediaPlayer.setDataSource(dubstepPlaylistString[0]);
} catch (IllegalArgumentException 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();
}
dubstepMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
}
@Override
protected Void doInBackground(Void... params) {
// TODO Auto-generated method stub
//mediaPlayerLoadingBar =ProgressDialog.show(PlaylistActivity.this, "", "Loading. Please wait...", true);
return null;
}
protected void onPostExecute(Void result){
//mediaPlayerLoadingBar =ProgressDialog.show(PlaylistActivity.this, "", "Loading. Please wait...", true)
dubstepMediaPlayer.prepareAsync();
dubstepMediaPlayer.start();
mediaPlayerLoadingBar.dismiss();
}
}.execute();`
如果有人仍然面临这个问题，这里是下面的代码
AsyncTask<Void, Void, Void> task = new AsyncTask<Void, Void, Void>() {
@Override
protected void onPreExecute() {
if(translation.equals("NIV"))
{
if(AudioPlaying==false)
{
mediaPlayer = new MediaPlayer();
mediaPlayer.setOnPreparedListener(Main.this);
mediaController = new MediaController(Main.this);
}
else
mediaController.show();
}
else
Toast.makeText(getBaseContext(), "عفوا, جاري تحميل ملفات الصوت الخاصة بترجمة الفانديك ", Toast.LENGTH_LONG).show();
pd = new ProgressDialog(Main.this);
pd.setTitle("Processing...");
pd.setMessage("Please wait.");
pd.setCancelable(false);
pd.setIndeterminate(true);
pd.show();
}
@Override
protected Void doInBackground(Void... arg0) {
try {
//Do something...
//Thread.sleep(5000);
try
{
mediaPlayer.setDataSource(AudioUrlPath);
mediaPlayer.prepare();
mediaPlayer.start();
AudioPlaying=true;
}
catch (IOException e) {
Log.e("AudioFileError", "Could not open file " + AudioUrlPath + " for playback.", e);
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void result) {
if (pd!=null) {
pd.dismiss();
//b.setEnabled(true);
}
}
};
task.execute((Void[])null);
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