Android之zip文件加密解压及进度条的达成

发布时间：2021-11-19 18:29:19 所属栏目：教程来源：互联网

导读：根据宁德站长网 Www.0593Zz.Com报道 Zip4jSp.java /** * unzip file to dest dir with password in thread. * * @param zipFile * @param dest * @param passwd * @param charset * null or empty is utf-8 * @param Handler * handler in thread * @param is

根据宁德站长网 Www.0593Zz.Com报道

Zip4jSp.java

/**
  * unzip file to dest dir with password in thread.
  *
  * @param zipFile
  * @param dest
  * @param passwd
  * @param charset
  *            null or empty is utf-8
  * @param Handler
  *            handler in thread
  * @param isDeleteZipFile
  *            true:delete zip file.false:not.
  * @throws ZipException
  */
public static void Unzip(final File zipFile, String dest, String passwd,
   String charset, final Handler handler, final boolean isDeleteZipFile)
   throws ZipException {
  ZipFile zFile = new ZipFile(zipFile);
  if (TextUtils.isEmpty(charset)) {
   charset = "UTF-8";
  }
  zFile.setFileNameCharset(charset);
  if (!zFile.isValidZipFile()) {
   throw new ZipException(
     "Compressed files are not illegal, may be damaged.");
  }
  File destDir = new File(dest); // Unzip directory
  if (destDir.isDirectory() && !destDir.exists()) {
   destDir.mkdir();
  }
  if (zFile.isEncrypted()) {
   zFile.setPassword(passwd.toCharArray());
  }

  final ProgressMonitor progressMonitor = zFile.getProgressMonitor();

  Thread progressThread = new Thread(new Runnable() {

   @Override
   public void run() {
    Bundle bundle = null;
    Message msg = null;
    try {
     int percentDone = 0;
     // long workCompleted=0;
     // handler.sendEmptyMessage(ProgressMonitor.RESULT_SUCCESS)
     if (handler == null) {
      return;
     }
     handler.sendEmptyMessage(CompressStatus.START);
     while (true) {
      Thread.sleep(1000);

      percentDone = progressMonitor.getPercentDone();
      bundle = new Bundle();
      bundle.putInt(CompressKeys.PERCENT, percentDone);
      msg = new Message();
      msg.what = CompressStatus.HANDLING;
      msg.setData(bundle);
      handler.sendMessage(msg);
      if (percentDone >= 100) {
       break;
      }
     }
     handler.sendEmptyMessage(CompressStatus.COMPLETED);
    } catch (InterruptedException e) {
     bundle = new Bundle();
     bundle.putString(CompressKeys.ERROR, e.getMessage());
     msg = new Message();
     msg.what = CompressStatus.ERROR;
     msg.setData(bundle);
     handler.sendMessage(msg);
     e.printStackTrace();
    }
    finally
    {
     if(isDeleteZipFile)
     {
      zipFile.deleteOnExit();//zipFile.delete();
     }
    }
   }
  });

  progressThread.start();
  zFile.setRunInThread(true);
  zFile.extractAll(dest);
}

注:
(1)、字符集默认采用UTF-8
(2)、解压文件在线程中进行，所以需要setRunInThread(true).由于采用线程中解压文件，所以调用该函数时相当于异步执行，调用代码会直接往下走，需要注意并加以处理。
(3)、进度条另开了一个线程来处理，并将处理的结果以handler的形式发送
(4)、使用zipFile.deleteOnExit()而不是zipFile.delete();因为使用线程解压时，虽然从progressMonitor获得的percentDone已经达到了100，而事实上数据并没有完全解压完成。这时退出循环执行finally的delete函数，如果使用zipFile.delete()，将会删除文件，这样会使后续的解压失败。而使用zipFile.deleteOnExit()函数，该函数是当VM终止时才会删除文件，与zipFile.delete()删除文件不同。APP在运行时，VM始终是在的，所以这样删除可以确保后续的解压能够正常进行。或者不去删除文件。
(5)、handler的代码见后文的MainActivity.java。

CompressKeys.java

package com.sparkle.compress;

public class CompressKeys {
public final static String PERCENT="PERCENT";
public final static String ERROR="ERROR";
}

CompressStatus.java

package com.sparkle.compress;

public class CompressStatus {
public final static int START=0;
public final static int HANDLING=1;
public final static int COMPLETED=2;
public final static int ERROR=3;
}

MainActivity.java

private Handler _handler=new Handler(){
  @Override
  public void handleMessage(Message msg) {
   switch (msg.what) {
   case CompressStatus.START:
   {
    setTitle("Start...");
    break;
   }
   case CompressStatus.HANDLING:
   {
    Bundle bundle=msg.getData();
    int percent=bundle.getInt(CompressKeys.PERCENT);
    setTitle(percent+"%");
    break;
   }
   case CompressStatus.ERROR:
   {
    Bundle bundle=msg.getData();
    String error=bundle.getString(CompressKeys.ERROR);
    _info_textView.setText(error);
    break;
   }
   case CompressStatus.COMPLETED:
   {
    setTitle("Completed");
    byte[] data=FileSp.read(tempFilePath);
    try {
     String dataStr=new String(data,"UTF-8");
     _info_textView.setText(dataStr);
    } catch (UnsupportedEncodingException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
    }
    break;
   }
   default:
    break;
   }

  };
};
}

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