进度条与文件解压缩

问题描述

我正在尝试更新进度栏，其中包含在SD卡中解压缩文件的信息.我的解压缩工作正常，但是没有出现进度栏.这是我在mainactivity中的代码:

I am trying to update a progress bar with unzipping of file in the sd card. My unzipping works fine but the progress bar does not appear. Here is my code in mainactivity:

private ProgressBar bar;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    bar = (ProgressBar) findViewById(R.id.progress);

    String zipFilename = Environment.getExternalStorageDirectory() + "path to my zip file in sd card";  
    String unzipLocation = Environment.getExternalStorageDirectory() + "the output folder";  




    Decompress d = new Decompress(zipFilename, unzipLocation);  
    d.unzip(); 
}

public class Decompress {   
    private String _zipFile;   
    private String _location;
    private int per = 0;



    public Decompress(String zipFile, String location) {
        _zipFile = zipFile;     
        _location = location;      
        _dirChecker("");   
        }    
    public void unzip() {     
        try  {       
            ZipFile zip = new ZipFile(_zipFile);
            bar.setMax(zip.size());
            FileInputStream fin = new FileInputStream(_zipFile);       
            ZipInputStream zin = new ZipInputStream(fin);
            ZipEntry ze = null;       
            while ((ze = zin.getNextEntry()) != null) {

                Log.v("Decompress", "Unzipping " + ze.getName());          
                if(ze.isDirectory()) {           
                    _dirChecker(ze.getName());         
                    } else {      
// Here I am doing the update of my progress bar

                        per++;
                        bar.setProgress(per);
                        FileOutputStream fout = new FileOutputStream(_location + ze.getName());           
                        for (int c = zin.read(); c != -1; c = zin.read()) {  

                            fout.write(c);           
                            }            
                        zin.closeEntry();          
                        fout.close();         
                        }                
                }       
            zin.close();    
            } catch(Exception e) {       
                Log.e("Decompress", "unzip", e);    
                }    
        }    
    private void _dirChecker(String dir) {     
        File f = new File(_location + dir);      
        if(!f.isDirectory()) {       
            f.mkdirs();     
            }   
        }

    }
}

推荐答案

您的解压缩代码在Main/UI线程上运行，从而冻结了UI.您想使用 AsyncTask 在后台线程中进行解压缩.

Your unzipping code is running on the Main/UI thread, thereby freezing the UI. You want to do the unzipping in a background thread using AsyncTask.

您的案例示例:

 private class Decompress extends AsyncTask<Void, Integer, Integer> {

   private String _zipFile;   
   private String _location;
   private int per = 0;

   public Decompress(String zipFile, String location) {
       _zipFile = zipFile;     
       _location = location;      
       _dirChecker("");   
   }


    @Override
    protected Integer doInBackground() {
        try {
            ZipFile zip = new ZipFile(_zipFile);
            bar.setMax(zip.size());
            FileInputStream fin = new FileInputStream(_zipFile);
            ZipInputStream zin = new ZipInputStream(fin);
            ZipEntry ze = null;
            while ((ze = zin.getNextEntry()) != null) {

                Log.v("Decompress", "Unzipping " + ze.getName());
                if (ze.isDirectory()) {
                    _dirChecker(ze.getName());
                } else {
                    // Here I am doing the update of my progress bar

                    per++;
                    publishProgress(per);

                    FileOutputStream fout = new FileOutputStream(_location + ze.getName());
                    for (int c = zin.read(); c != -1; c = zin.read()) {
                        fout.write(c);
                    }
                    zin.closeEntry();
                    fout.close();
                }
            }
            zin.close();
        } catch (Exception e) {
            Log.e("Decompress", "unzip", e);
        }
        return totalSize;
    }

    @Override
    protected void onProgressUpdate(Integer... progress) {
        bar.setProgress(per); //Since it's an inner class, Bar should be able to be called directly
    }

    @Override    
    protected void onPostExecute(Integer... result) {
        Log.i("Completed. Total size: " + result);
    }
}

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