如何解决加载KeypressDelete.ogg，KeypressReturn.ogg的错误？

Question

我正在从书中的一个示例（Android编程 - 大书呆子牧场指南）中学习Android，我正在逐字逐句地遵循他们的代码。非常简单的代码，至少我认为...下面是我的模拟器的图像和大多数，如果不是所有的代码，除了布局文件。

我的模拟器使用API​​ Level 18 android 4.3.1 cpu ARM。当我从列表中点击犯罪时，我想看到一条日志，说明我点击犯罪#x但我没有看到它。相反，我看到SoundPool标签错误加载/system/media/audio/ui/KeypressDelete.ogg和其他4个类似错误，如加载KeypressReturn.ogg错误。

我搜索了互联网并在堆栈上溢出了几个小时的解决方案。我能找到的只是＆＃34;忽略它＆＃34;或者＆＃34;关闭设置＆＃34;，我不知道怎么做但我不想关掉它。我想解决它并继续这个例子，这样我就可以学习。有谁知道这个错误，可以帮我解决吗，拜托？我很感激。

以下是代码的一部分：

public class Crime 
{    
    private UUID mId;
    private String mTitle;
    private Date mDate;
    private boolean mSolved;

    public Crime() 
    {
        // Generate unique identifier
        mId = UUID.randomUUID();
        mDate = new Date();
    }

    public String getTitle() 
    {
        return mTitle;
    }

    public void setTitle(String title) 
    {
        mTitle = title;
    }

    public UUID getId() 
    {
        return mId;
    }

    public Date getDate() 
    {
        return mDate;
    }

    public void setDate(Date date) 
    {
        mDate = date;
    }

    public boolean isSolved() 
    {
        return mSolved;
    }

    public void setSolved(boolean solved) 
    {
        mSolved = solved;
    }

    @Override
    public String toString() 
    {
        return mTitle;
    }
}

public class CrimeLab 
{
    private ArrayList<Crime> mCrimes;
    private static CrimeLab sCrimeLab;
    private Context mAppContext;

    private CrimeLab(Context appContext) 
    {
        mAppContext = appContext;
        mCrimes = new ArrayList<Crime>();

        // Mock Crime objects
        for (int i = 0; i < 100; i++) 
        {
            Crime c = new Crime();

            c.setTitle("Crime #" + i);
            c.setSolved(i % 2 == 0); // Every other one
            mCrimes.add(c);
        }
    }

    public static CrimeLab get(Context c) 
    {
        if (sCrimeLab == null)
        {
            sCrimeLab = new CrimeLab(c.getApplicationContext());
        }

        return sCrimeLab;
    }

    public ArrayList<Crime> getCrimes() 
    {
        return mCrimes;
    }

    public Crime getCrime(UUID id) 
    {
        for (Crime c : mCrimes) 
        {
            if (c.getId().equals(id))
                return c;
        }

        return null;
    }
}

package com.bignerdranch.android.criminalintent;

import java.util.ArrayList;  
import android.os.Bundle;
import android.support.v4.app.ListFragment;
import android.util.Log;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class CrimeListFragment extends ListFragment 
{
    private static final String TAG = "CrimeListFragment";    
    private ArrayList<Crime> mCrimes;

    @Override
    public void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        getActivity().setTitle(R.string.crimes_title);
        mCrimes = CrimeLab.get(getActivity()).getCrimes();

        ArrayAdapter<Crime> adapter = new ArrayAdapter<Crime>(getActivity(), android.R.layout.simple_list_item_1, mCrimes);

        setListAdapter(adapter);
    }

    @Override
    public void onListItemClick(ListView l, View v, int position, long id) 
    {
        Crime c = (Crime) (getListAdapter()).getItem(position);

        Log.d(TAG, c.getTitle() + " was clicked");
    }
}