Android 大文件上传时处理上传进度问题小结

概述进行大文件上传时，显示上传进度是很好的用户体验，可以有效的缓解用户急躁的情绪。今天AndroidIT分享一个好的显示上传进度的解决方案。

进行大文件上传时，显示上传进度是很好的用户体验，可以有效的缓解用户急躁的情绪。今天AndroID IT 分享一个好的显示上传进度的解决方案。

我们用到以下两个类就可实现带进度条的文件上传：

1、Custommultipartentity extends multipartentity,

2、httpMultipartPost extends AsyncTask

import java.io.FilterOutputStream; import java.io.IOException; import java.io.OutputStream; import java.nio.charset.Charset; import org.apache.http.entity.mime.httpMultipartMode; import org.apache.http.entity.mime.multipartentity;  public class Custommultipartentity extends multipartentity {   private final ProgressListener Listener;   public Custommultipartentity(final ProgressListener Listener) {     super();     this.Listener = Listener;   }   public Custommultipartentity(final httpMultipartMode mode,final ProgressListener Listener) {     super(mode);     this.Listener = Listener;   }   public Custommultipartentity(httpMultipartMode mode,final String boundary,final Charset charset,final ProgressListener Listener) {     super(mode,boundary,charset);     this.Listener = Listener;   }   @OverrIDe   public voID writeto(final OutputStream outstream) throws IOException {     super.writeto(new CountingOutputStream(outstream,this.Listener));   }   public static interface ProgressListener {     voID transferred(long num);   }   public static class CountingOutputStream extends FilterOutputStream {     private final ProgressListener Listener;     private long transferred;     public CountingOutputStream(final OutputStream out,final ProgressListener Listener) {       super(out);       this.Listener = Listener;       this.transferred = 0;     }     public voID write(byte[] b,int off,int len) throws IOException {       out.write(b,off,len);       this.transferred += len;       this.Listener.transferred(this.transferred);     }     public voID write(int b) throws IOException {       out.write(b);       this.transferred++;       this.Listener.transferred(this.transferred);     }   } } 

该类计算写入的字节数，我们需要在实现ProgressListener中的trasnfered()方法，更行进度条 

public class httpMultipartPost extends AsyncTask<httpResponse,Integer,TypeUploadImage> {   ProgressDialogpd;   longtotalSize;   @OverrIDe   protectedvoIDonPreExecute(){     pd= newProgressDialog(this);     pd.setProgressstyle(ProgressDialog.STYLE_HORIZONTAL);     pd.setMessage("Uploading Picture...");     pd.setCancelable(false);     pd.show();   }    @OverrIDe   protectedTypeUploadImagedoInBackground(httpResponse... arg0) {     httpClIEnthttpClIEnt = newDefaulthttpClIEnt();     httpContexthttpContext = newBasichttpContext();     httpPosthttpPost = newhttpPost("http://herpderp.com/UploadImage.PHP");     try{       CustommultipartentitymultipartContent = newCustommultipartentity(           newProgressListener() {             @OverrIDe             public voID transferred(longnum){               publishProgress((int) ((num / (float) totalSize) * 100));             }           });       // We use fileBody to transfer an image       multipartContent.addPart("uploaded_file",newfileBody(           newfile(m_userSelectedImagePath)));       totalSize= multipartContent.getContentLength();       // Send it       httpPost.setEntity(multipartContent);       httpResponseresponse = httpClIEnt.execute(httpPost,httpContext);       String serverResponse = EntityUtils.toString(response.getEntity());       ResponseFactoryrp = newResponseFactory(serverResponse);       return(TypeImage) rp.getData();     } catch(Exception e) {       System.out.println(e);     }     return null;   }   @OverrIDe   protectedvoIDonProgressUpdate(Integer... progress){     pd.setProgress((int) (progress[0]));   }   @OverrIDe   protectedvoIDonPostExecute(TypeUploadImageui) {     pd.dismiss();   } } 

在 transferred()函数中调用publishProgress((int) ((num / (float) totalSize) * 100));

在onProgressUpdate()实现上传进度的更新 *** 作

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