如何使用循環播放媒體文件有一些延遲？

Question

我正在嘗試使用循環播放原始媒體文件。我寫了一個同步方法來播放媒體文件。這是在仿真器上工作，但不在真實設備上。

我爲需要播放聲音的問題創建了一個簡單的bean。

public class Question { 
private String mQuestionString; 
private int mSoundFile; 
private int mAnswer; 
private int mQuestionNo; 

public Question() { 

    mQuestionNo = 0; 
    mQuestionString = ""; 
    mSoundFile = 0; 
    mAnswer = 0; 
} 

public Question(int mQuestionNo, String mQuestionString, int mSoundFile, 
     int mAnswer) { 
    super(); 
    this.mQuestionNo = mQuestionNo; 
    this.mQuestionString = mQuestionString; 
    this.mSoundFile = mSoundFile; 
    this.mAnswer = mAnswer; 
} 

public String getQuestionString() { 
    return mQuestionString; 
} 

public void setQuestionString(String mQuestionString) { 
    this.mQuestionString = mQuestionString; 
} 

public int getSoundFile() { 
    return mSoundFile; 
} 

public void setSoundFile(int mSoundFile) { 
    this.mSoundFile = mSoundFile; 
} 

public int getAnswer() { 
    return mAnswer; 
} 

public void setAnswer(int mAnswer) { 
    this.mAnswer = mAnswer; 
} 

public int getQuestionNo() { 
    return mQuestionNo; 
} 

public void setQuestionNo(int mQuestionNo) { 
    this.mQuestionNo = mQuestionNo; 
} 

@Override 
public String toString() { 
    return "Question " + mQuestionNo + ". " + mQuestionString; 
} 

} 

這是我在活動

public class LQActivity extends Activity{ 

    private Vector<Question> mQuestions = null; 
private TextView tvQuestion = null; 
private Button btnSubmit = null; 
private Button btnNext = null; 
    ... 

    private void prepareQuestions() { 
    // TODO Auto-generated method stub 
    mQuestions = new Vector<Question>(); 
    mQuestions.add(new Question(1, "Count the number of the Tabala played", 
      R.raw.q1, 5)); 
    mQuestions.add(new Question(2, 
      "Count the number of the persons visited temple", R.raw.q2, 3)); 
    mQuestions 
      .add(new Question(3, "Count the number of frogs", R.raw.q3, 6)); 
    mQuestions.add(new Question(4, 
      "Count the number of the cuckoo on the tree", R.raw.q4, 8)); 
    mQuestions.add(new Question(5, "Count the number of the flute played", 
      R.raw.q5, 7)); 

} 

private synchronized void playQuestion(Question question) { 


    mMediaPlayer = MediaPlayer.create(this, question.getSoundFile()); 

    mMediaPlayer.start(); 
    try { 
     Thread.sleep(3000); 
    } catch (InterruptedException e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
     if (mMediaPlayer != null) { 
      mMediaPlayer.release(); 
     } 
    } 
      mMediaPlayer.release(); 
     } 

} 

問題是mMediaPlyer.create()被返回null

我沒有得到確切的問題代碼。你的幫助表示讚賞。在此先感謝...

Answer 1

mMediaPlyer.create() is returning null 

的原因是由於損壞的MP3文件，或使用不支持的文件，查看鏈路支持的Android media format