android文件下载及进度条

1、Androidsdk3.0 编译通过packagecom.download;importjava.io.File;importjava.io.FileOutputStream;importjava.io.IOException;importjava.io.InputStream;.URL;.URLConnection;importorg.apache.http.client.ClientProtocolException;importandroid.app.Activity;importandroid.os.Bundle;importandroid.os.Environment;importa

2、ndroid.os.Handler;importandroid.os.Message;importandroid.util.Log;importandroid.view.View;importandroid.view.View.OnClickListener;importandroid.widget.Button;importandroid.widget.ProgressBar;importandroid.widget.TextView;importandroid.widget.Toast;publicclassAndroidDownLoadActivityextendsActivitypri

3、vateButtonDownloadTextButton=null;privateButtonDownloadMp3Button=null;ProgressBarpb;TextViewtv;intfileSize;intdownLoadFileSize;StringfileEx,fileNa,filename;privateHandlerhandler=newHandler()OverridepublicvoidhandleMessage(Messagemsg)/定义一个 Handler,用于处理下载线程与if(!Thread.currentThread().isInterrupted()sw

4、itch(msg.what)case0:pb.setMax(fileSize);UI 间通讯case 1:pb.setProgress(downLoadFileSize);intresult=downLoadFileSize*100/fileSize;tv.setText(result+%);break;case 2:Toast.makeText(AndroidDownLoadActivity.this,文件下载完成,1).show();break;case-1:Stringerror=msg.getData().getString(error);Toast.makeText(AndroidD

5、ownLoadActivity.this,error,1).show();break;super.handleMessage(msg);/*downloadfiletosdcard.*/publicvoiddown_file(Stringurl,Stringpath)throwsIOException/下载函数filename=url.substring(url.lastIndexOf(/)+1);/获取文件名URLmyURL=newURL(url);URLConnectionconn=myURL.openConnection();conn.connect();InputStreamis=co

6、nn.getInputStream();this.fileSize=conn.getContentLength();/根据响应获取文件大小Log.i(value,length=+this.fileSize);if(this.fileSize=0)thrownewRuntimeException(无法获知文件大小)；if(is=null)thrownewRuntimeException(streamisnull);Filefile=newFile(Environment.getExternalStorageDirectory(),filename);FileOutputStreamfos=new

7、FileOutputStream(file);/把数据存入路径+文件名bytebuf 口=newbyte1024;downLoadFileSize=0;sendMsg(0);do/循环读取intnumread=is.read(buf);if(numread=-1)break;)fos.write(buf,0,numread);downLoadFileSize+=numread;sendMsg(1);/更新进度条while(true);sendMsg(2);/通知下载完成tryis.close();catch(Exceptionex)Log.e(tag,error:+ex.getMessage(

8、),ex);privatevoidsendMsg(intflag)Messagemsg=newMessage();msg.what=flag;handler.sendMessage(msg);/*Calledwhentheactivityisfirstcreated.*/OverridepublicvoidonCreate(BundlesavedInstanceState)(super.onCreate(savedlnstanceState);setContentView(R.layout.main);super.onCreate(savedInstanceState);setContentV

9、iew(R.layout.main);pb=(ProgressBar)findViewById(R.id.down_pb);tv=(TextView)findViewById(R.id.tv);newThread()(publicvoidrun()(try(down_file(http:/下载路径,/sdcard/);/下载文件，参数：第一个 URL.,第二个存放路径catch(ClientProtocolExceptione)(/TODOAuto-generatedcatchblocke.printStackTrace();catch(IOExceptione)(/TODOAuto-gene

10、ratedcatchblocke.printStackTrace();.start();DownloadTextButton=(Button)findViewById(R.id.DownTextButtonId);DownloadTextButton.setOnClickListener(newDownTextButtonListener();DownloadMp3Button=(Button)findViewById(R.id.DownMp3ButtonId);DownloadMp3Button.setOnClickListener(newDownMp3ButtonListener();pr

11、ivateclassDownTextButtonListenerimplementsOnClickListener(publicvoidonClick(Viewv)(Threadthread=newThread(newRunnable()publicvoidrun()(/TODOAuto-generatedmethodstubHttpDownloaderhttpDownloader=newHttpDownloader();Stringirc=httpDownloader.download(http:/下载路径,);System.out.println(irc););thread.start()

12、;privateclassDownMp3ButtonListenerimplementsOnClickListener(publicvoidonClick(Viewv)(Threadthread=newThread(newRunnable()(publicvoidrun()(/TODOAuto-generatedmethodstubHttpDownloaderhttpDownloader=newHttpDownloader();intresult=httpDownloader.downFile(http:/下载路径,test/,love.exe);System.out.println(resu

13、lt););thread.start();packagecom.download;importjava.io.BufferedReader;importjava.io.File;importjava.io.IOException;importjava.io.InputStream;importjava.io.InputStreamReader;.HttpURLConnection;.MalformedURLException;.URL;.URLConnection;importandroid.util.Log;publicclassHttpDownloaderprivateURLurl=nul

14、l;publicStringdownload(StringurlStr)StringBuffersb=newStringBuffer();Stringline=null;BufferedReaderbuffer=null;try/创建一个 url 对象 url=newURL(urlStr);/创建一个 Http 连接对象/HttpURLConnectionurlConn=(HttpURLConnection)url.openConnection();URLConnectionurlConn=url.openConnection();urlConn.connect();intfileSize=u

15、rlConn.getContentLength();/根据响应获取文件大小Log.d(filesize,*+fileSize);/使用 IO 流读取数据buffer=newBufferedReader(newInputStreamReader(urlConn.getInputStream();while(line=buffer.readLine()!=null)(sb.append(line);catch(Exceptione)(e.printStackTrace();finally(try(buffer.close();catch(Exceptione)(e.printStackTrace(

16、);returnsb.toString();publicintdownFile(StringurlStr,Stringpath,StringfileName)(InputStreaminputStream=null;try(FileUtilsfileUtils=newFileUtils();if(fileUtils.isFileExist(path+fileName)(return1;else(inputStream=getInputStreamFromUrl(urlStr);FileresultFile=fileUtils.write2SDFromInput(path,fileName,in

17、putStream);if(resultFile=null)(return-1;catch(Exceptione)(e.printStackTrace();return-1;finally(try(inputStream.close();catch(Exceptione)(e.printStackTrace();return0;privateInputStreamgetInputStreamFromUrl(StringurlStr)throwsMalformedURLException,IOException(/TODOAuto-generatedmethodstuburl=newURL(ur

18、lStr);HttpURLConnectionurlConn=(HttpURLConnection)url.openConnection();InputStreaminputStream=urlConn.getInputStream();returninputStream;packagecom.download;importjava.io.File;importjava.io.FileOutputStream;importjava.io.IOException;importjava.io.InputStream;importjava.io.OutputStream;importandroid.

19、os.Environment;publicclassFileUtils(privateStringSDPATH;publicStringgetSDPATH()(returnSDPATH;)publicFileUtils()(SDPATH=Environment.getExternalStorageDirectory()+/;)publicFilecreateSDFile(Stringfilename)throwsIOException(Filefile=newFile(SDPATH+filename);file.createNewFile();returnfile;)publicFilecreateSDDir(