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我必須播放音頻文件。這是在zip文件，這是目前在SD卡。並且音頻文件被加密。所以，當解密音頻時，我會在輸入流中獲取數據。如何在不解壓整個文件的情況下從加密zip內的文件流式傳輸音樂？
我不想解壓，因爲它吃光盤上的空間。
正如我所調查，我沒有得到有關如何直接播放音頻，如果我有流的線索。 它只能通過網絡。這不是這種情況。
所以我想是產生一個線程，將保持附加數據（字節）的文件。開始時，我打電話MediadPlayer開始工作。
媒體播放器沒有問題。樂趣從這裏開始：假設音頻文件在6min - 5MB。 緩衝可能發生在2MB。在尋找酒吧，我可以看到2分鐘作爲我的最大持續時間。這是完全正確的。 當緩衝仍然繼續..發生時，我想更新搜索欄中的時間及其長度（搜索欄長度） 與給定時間成正比。我如何去做這件事。
我試過OnBufffering爲此，它沒有工作。我猜實際上它是用於流式音頻文件，如果它通過網絡播放的話。
請給我一些簡單的解決辦法，如何做到這一點？不要求我重寫MediaPlayer課程並開始工作。
任何幫助表示讚賞。讓我知道你是否需要更清晰。
public class NotesAudDisplay extends Activity implements OnPreparedListener, MediaController.MediaPlayerControl{
private static final String TAG = "activity-NotesAudioDisplay";
private String audioFilePath;
private String notesFileName;
private String mcfFileName;
private String key;
private SeekBar seekBarProgress;
private NotesElement notesElement = null;
private String notesTittle = "", notesHeading = "";
private TextView heading_tv, playerStatus_tv;
private QuesBuilder qb = null;
private MediaPlayer mediaPlayer = null;
private MediaController mediaController;
private Drawable play_butt, pause_butt;
private ProgressDialog pd;
private Resources res = null;
private Handler handler = new Handler();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.audio_notesdisplay);
res = getResources();
play_butt = res.getDrawable(R.drawable.play);
pause_butt = res.getDrawable(R.drawable.pause);
heading_tv = (TextView) findViewById(R.id.notesHeading_tv);
playerStatus_tv = (TextView) findViewById(R.id.playerStatus_tv);
Intent intent = getIntent();
notesTittle = intent.getStringExtra("notesTittle");
notesFileName = intent.getStringExtra("notesFileName");
mcfFileName = intent.getStringExtra("mcfFileName");
key = intent.getStringExtra("key");
TextView tittle_tv = (TextView) findViewById(R.id.notesTittle_tv);
tittle_tv.setText(notesTittle);
NotesXMLParser nxp = new NotesXMLParser(this, notesFileName,
mcfFileName, key);
nxp.OpenXmlDocument();
notesElement = nxp.getNotesContent();
Log.d("TAG", "notesele:" + notesElement);
if (notesElement != null) {
notesHeading = notesElement.getHeading();
heading_tv.setText(notesHeading);
QuesBuilderSet qbs = notesElement.getNotesStatement();
ArrayList quesBuilder = qbs.getQuesBuilderSet();
if (quesBuilder != null) {
Log.d(TAG, " quesBuilder len:" + quesBuilder.size());
for (int i = 0; i < quesBuilder.size(); i++) {
qb = (QuesBuilder) quesBuilder.get(i);
if (qb.getType() == QuesBuilder.SPEECH) {
Log.d(TAG, " AUDIO");
String file = qb.getQuesSpeech();
File f = createTmpAudioFile(file);
boolean decrypt_result = false;
if (f != null) {
new LongOperation().execute(f);
Log.d(TAG,"****before long operation****");
try {
Log.d(TAG,"****before thread operation****");
Thread.sleep(3000);
Log.d(TAG,"****after thread operation****");
setContent();
} catch (Exception e) {
Log.d("InstructionForm", "Sleep thread fails");
}
Log.d(TAG,"****after catch****");
} else {
heading_tv.setText(notesHeading
+ " Unable to play the audio.");
}
} else {
Log.d(TAG, " other:" + qb.getType());
}
}
}
}
}// onCreate
public void setContent() {
mediaController = new MediaController(NotesAudDisplay.this);
mediaPlayer = new MediaPlayer();
Log.d(TAG,"***GOING TO PREP STATE***");
mediaPlayer.setOnPreparedListener(NotesAudDisplay.this);
Log.d(TAG,"***DONE WITH PREP STATE***");
try {
mediaPlayer.setDataSource(audioFilePath);
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
mediaPlayer.prepareAsync();
mediaPlayer.start();
playerStatus_tv.setText("Playing.. . ");
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
private File createTmpAudioFile(String file) {
DBAdapter dba = new DBAdapter(NotesAudDisplay.this);
dba.open();
String mobiDataPath = dba.get_mobidata_path();
dba.close();
audioFilePath = mobiDataPath + "/" + file;
Log.d(TAG, "tmp audio filePath:" + audioFilePath);
File f = null;
try {
f = new File(audioFilePath);
return f;
} catch (Exception e) {
f = null;
Log.d(TAG, " exception caught in creating audio file on sdcard");
}
return null;
}
private class LongOperation extends AsyncTask<File, Void, Boolean> {
@Override
protected void onPreExecute() {
// TODO run small wheel
// show_wheel();
}
@Override
protected Boolean doInBackground(File... arg0) {
DecryptZipReader dr = new DecryptZipReader();
File f = arg0[0];
Log.d(TAG, "*********copying start*********");
boolean res = dr.getDecryptFileStream(NotesAudDisplay.this,
qb.getQuesSpeech(), mcfFileName, key, f);
return new Boolean(res);
}
@Override
protected void onPostExecute(Boolean result) {
// close_wheel();
Log.d(TAG, "*********copying stop*********");
}
}
@Override
protected void onDestroy() {
super.onDestroy();
if (mediaPlayer != null) {
mediaPlayer.release();
mediaPlayer = null;
}
}
@Override
protected void onStop() {
super.onStop();
mediaPlayer.stop();
mediaPlayer.release();
}
@Override
public boolean onTouchEvent(MotionEvent event) {
//the MediaController will hide after 3 seconds - tap the screen to make it appear again
mediaController.show(0);
return false;
}
//--MediaPlayerControl methods----------------------------------------------------
public void start() {
mediaPlayer.start();
}
public void pause() {
mediaPlayer.pause();
}
public int getDuration() {
Log.d(TAG,"***duration:"+mediaPlayer.getDuration());
return mediaPlayer.getDuration();
}
public int getCurrentPosition() {
return mediaPlayer.getCurrentPosition();
}
public void seekTo(int i) {
mediaPlayer.seekTo(i);
}
public boolean isPlaying() {
return mediaPlayer.isPlaying();
}
public int getBufferPercentage() {
return 0;
}
public boolean canPause() {
return true;
}
public boolean canSeekBackward() {
return true;
}
public boolean canSeekForward() {
return true;
}
//--------------------------------------------------------------------------------
public void onPrepared(MediaPlayer mediaPlayer) {
Log.d(TAG, "*********onPrepared*********");
mediaController.setMediaPlayer(this);
mediaController.setAnchorView(findViewById(R.id.main_audio_view));
handler.post(new Runnable() {
public void run() {
mediaController.setEnabled(true);
mediaController.show(0);
}
});
}
}
我會重新考慮你所要求的...在播放時臨時解壓縮音頻文件。請記住，並非所有音頻文件都是固定比特率，並且不能立即搜索。 – Brad 2011-12-24 17:01:55
嗨，布拉德。我認爲這一點。我有這個機制。我改變了我的代碼。我正在檢查文件是否存在，並且收集的數據超過了256個字節。所以這部分不是問題。我的問題是如何更新搜索欄。 – maxwells 2011-12-24 19:06:26
是不是有一些音頻文件的元數據，它告訴什麼是音頻的總長度（我的意思是，而不是空間）？您可以讀取該文件，並將文件的長度直接放到seekbar中，而不需要不斷更新最大值。 – Genry 2012-10-29 10:09:48