求解读JAVA代码，为什么MP4文件不能播放？

Question

下载的一个压缩包（压缩包内含mp4文件、字幕文件等），压缩包有密码，android程序用密码打开压缩文件，并执行一系列操作后，程序自动播放压缩包内的MP4文件，但MP4文件不能直接使用播放器播放，求解答如何能让mp4文件用播放器播放 。。。谢谢 。。。这里是完整代码下载链接：点击下载完整代码，（用JD-GUI直接查看Jar内的代码、0000208821-DF705DD4是去掉了扩展名的压缩文件）

下面是部分代码（代码位于jar文件内的nc.class）：

import android.widget.Toast;
import com.is.piano.base.ISApp;
import com.ispiano.crc64.Algorithm;
import java.io.File;
import java.io.PrintStream;
import java.util.List;
import net.lingala.zip4j.core.ZipFile;
import net.lingala.zip4j.exception.ZipException;
import net.lingala.zip4j.model.FileHeader;
import net.lingala.zip4j.model.ZipParameters;

public class nc
{
  public static boolean a(String paramString1, String paramString2)
  {
    long l1 = System.currentTimeMillis();
    ZipFile localZipFile;
    File localFile;
    try
    {
      localZipFile = new ZipFile(paramString1);
      localZipFile.setFileNameCharset("GBK");
      if (localZipFile.isValidZipFile())
        break label101;
      mh.b(paramString1);
      throw new ZipException("\u538B\u7F29\u6587\u4EF6\u4E0D\u5408\u6CD5,\u53EF\u80FD\u88AB\u635F\u574F.");
    }
    catch (ZipException localZipException)
    {
      localZipException.printStackTrace();
      localFile = new File(paramString2);
      if (!localFile.exists())
        break label99;
    }
    File[] arrayOfFile;
    int i;
    if (localFile.isDirectory())
    {
      arrayOfFile = localFile.listFiles();
      i = arrayOfFile.length;
    }
    for (int j = 0; ; j++)
    {
      if (j >= i)
      {
        label99: return false;
        label101: if (localZipFile.isEncrypted())
          localZipFile.setPassword("ISPiano Zhang");
        List localList = localZipFile.getFileHeaders();
        long l2 = 0L;
        for (int k = 0; ; k++)
        {
          if (k >= localList.size())
          {
            if (l2 <= mh.b())
              break;
            return false;
          }
          l2 += ((FileHeader)localList.get(k)).getUncompressedSize();
        }
        localZipFile.extractAll(paramString2);
        mh.b(paramString1);
        System.out.println("\u89E3\u538B\u8017\u65F6\uFF1A" + (System.currentTimeMillis() - l1));
        return true;
      }
      arrayOfFile[j].delete();
    }
  }

  public static boolean a(String paramString1, String paramString2, String paramString3)
  {
    System.out.println("unzipUnfinishFile," + paramString1);
    while (true)
    {
      int i;
      try
      {
        String str1 = mh.c() + "/ispiano/package_cache/" + paramString1;
        ZipFile localZipFile = new ZipFile(str1);
        if (!localZipFile.isValidZipFile())
          return false;
        localZipFile.setPassword("ISPiano Zhang");
        List localList = localZipFile.getFileHeaders();
        Algorithm localAlgorithm = new Algorithm();
        i = 0;
        if (i < localList.size())
          continue;
        eg localeg = new eg();
        localeg.a(Long.parseLong(paramString3.substring(0, 8) + "00"), paramString2);
        localeg.g();
        mh.b(str1);
        new File(mh.c() + "/ispiano/package_cache/" + "dir_" + paramString1).delete();
        return true;
        FileHeader localFileHeader = (FileHeader)localList.get(i);
        String str2 = localFileHeader.getFileName();
        long l = localFileHeader.getUncompressedSize();
        String str3 = localAlgorithm.getFileName(paramString2 + paramString3 + str2);
        File localFile = new File(mh.c() + "/ispiano/video_cache/" + str3);
        mi.c("jing", str3 + "," + str2 + "   " + localFile.length() + "," + l);
        if ((!localFile.exists()) || (localFile.length() != l))
        {
          mh.b(mh.c() + "/ispiano/video_cache/" + str3);
          if (mh.b() >= l)
            continue;
          Toast.makeText(ISApp.a(), 2131230828, 0).show();
          return false;
          mh.a(mh.c() + "/ispiano/package_cache/" + "dir_" + paramString1);
          mh.a(mh.c() + "/ispiano/video_cache/");
          localZipFile.extractFile(str2, mh.c() + "/ispiano/package_cache/" + "dir_" + paramString1);
          new File(mh.c() + "/ispiano/package_cache/" + "dir_" + paramString1 + "/" + str2).renameTo(new File(mh.c() + "/ispiano/video_cache/" + str3));
        }
      }
      catch (ZipException localZipException)
      {
        localZipException.printStackTrace();
        return false;
      }
      i++;
    }
  }

  public static boolean b(String paramString1, String paramString2)
  {
    try
    {
      ZipFile localZipFile = new ZipFile(paramString2);
      ZipParameters localZipParameters = new ZipParameters();
      localZipParameters.setCompressionMethod(8);
      localZipParameters.setCompressionLevel(5);
      localZipFile.addFolder(paramString1, localZipParameters);
      return true;
    }
    catch (ZipException localZipException)
    {
      localZipException.printStackTrace();
    }
    return false;
  }

  public static boolean c(String paramString1, String paramString2)
  {
    try
    {
      new ZipFile(paramString1).extractAll(paramString2);
      return true;
    }
    catch (ZipException localZipException)
    {
      localZipException.printStackTrace();
    }
    return false;
  }
}

Answer 1

public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
/* 创建VideoView对象 /
final VideoView videoView = (VideoView) findViewById(R.id.VideoView01);
/ 设置路径 /
videoView.setVideoPath("/sdcard/test.mp4");
/ 设置模式-播放进度条 */
videoView.setMediaController(new MediaController(Activity01.this));
videoView.requestFocus();
videoView.start();
}
你都没有加载Android内置的视频播放器，系统也不会从你的压缩文件里面加载，这是逻辑问题