前言
其实在网上有很多介绍下载文件或者解压zip文件的文章，但是两者结合的不多，所以这篇文章在此记录一下下载zip文件并直接解压的方法，直接上代码，文末有源码下载。
下载：
import java.io.BufferedInputStream; import java.io.BufferedOutputStream; import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.net.MalformedURLException; import java.net.URL; import java.net.URLConnection; import android.app.ProgressDialog; import android.content.Context; import android.content.DialogInterface; import android.content.DialogInterface.OnCancelListener; import android.os.AsyncTask; import android.util.Log; public class DownLoaderTask extends AsyncTask<Void, Integer, Long> { private final String TAG = "DownLoaderTask"; private URL mUrl; private File mFile; private ProgressDialog mDialog; private int mProgress = 0; private ProgressReportingOutputStream mOutputStream; private Context mContext; public DownLoaderTask(String url,String out,Context context){ super(); if(context!=null){ mDialog = new ProgressDialog(context); mContext = context; } else{ mDialog = null; } try { mUrl = new URL(url); String fileName = new File(mUrl.getFile()).getName(); mFile = new File(out, fileName); Log.d(TAG, "out="+out+", name="+fileName+",mUrl.getFile()="+mUrl.getFile()); } catch (MalformedURLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } @Override protected void onPreExecute() { // TODO Auto-generated method stub //super.onPreExecute(); if(mDialog!=null){ mDialog.setTitle("Downloading..."); mDialog.setMessage(mFile.getName()); mDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL); mDialog.setOnCancelListener(new OnCancelListener() { @Override public void onCancel(DialogInterface dialog) { // TODO Auto-generated method stub cancel(true); } }); mDialog.show(); } } @Override protected Long doInBackground(Void... params) { // TODO Auto-generated method stub return download(); } @Override protected void onProgressUpdate(Integer... values) { // TODO Auto-generated method stub //super.onProgressUpdate(values); if(mDialog==null) return; if(values.length>1){ int contentLength = values[1]; if(contentLength==-1){ mDialog.setIndeterminate(true); } else{ mDialog.setMax(contentLength); } } else{ mDialog.setProgress(values[0].intValue()); } } @Override protected void onPostExecute(Long result) { // TODO Auto-generated method stub //super.onPostExecute(result); if(mDialog!=null&&mDialog.isShowing()){ mDialog.dismiss(); } if(isCancelled()) return; ((MainActivity)mContext).showUnzipDialog(); } private long download(){ URLConnection connection = null; int bytesCopied = 0; try { connection = mUrl.openConnection(); int length = connection.getContentLength(); if(mFile.exists()&&length == mFile.length()){ Log.d(TAG, "file "+mFile.getName()+" already exits!!"); return 0l; } mOutputStream = new ProgressReportingOutputStream(mFile); publishProgress(0,length); bytesCopied =copy(connection.getInputStream(),mOutputStream); if(bytesCopied!=length&&length!=-1){ Log.e(TAG, "Download incomplete bytesCopied="+bytesCopied+", length"+length); } mOutputStream.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } return bytesCopied; } private int copy(InputStream input, OutputStream output){ byte[] buffer = new byte[1024*8]; BufferedInputStream in = new BufferedInputStream(input, 1024*8); BufferedOutputStream out = new BufferedOutputStream(output, 1024*8); int count =0,n=0; try { while((n=in.read(buffer, 0, 1024*8))!=-1){ out.write(buffer, 0, n); count+=n; } out.flush(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); }finally{ try { out.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } try { in.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } return count; } private final class ProgressReportingOutputStream extends FileOutputStream{ public ProgressReportingOutputStream(File file) throws FileNotFoundException { super(file); // TODO Auto-generated constructor stub } @Override public void write(byte[] buffer, int byteOffset, int byteCount) throws IOException { // TODO Auto-generated method stub super.write(buffer, byteOffset, byteCount); mProgress += byteCount; publishProgress(mProgress); } } }
解压：
import java.io.BufferedInputStream; import java.io.BufferedOutputStream; import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.util.Enumeration; import java.util.zip.ZipEntry; import java.util.zip.ZipException; import java.util.zip.ZipFile; import android.app.ProgressDialog; import android.content.Context; import android.content.DialogInterface; import android.content.DialogInterface.OnCancelListener; import android.os.AsyncTask; import android.util.Log; public class ZipExtractorTask extends AsyncTask<Void, Integer, Long> { private final String TAG = "ZipExtractorTask"; private final File mInput; private final File mOutput; private final ProgressDialog mDialog; private int mProgress = 0; private final Context mContext; private boolean mReplaceAll; public ZipExtractorTask(String in, String out, Context context, boolean replaceAll){ super(); mInput = new File(in); mOutput = new File(out); if(!mOutput.exists()){ if(!mOutput.mkdirs()){ Log.e(TAG, "Failed to make directories:"+mOutput.getAbsolutePath()); } } if(context!=null){ mDialog = new ProgressDialog(context); } else{ mDialog = null; } mContext = context; mReplaceAll = replaceAll; } @Override protected Long doInBackground(Void... params) { // TODO Auto-generated method stub return unzip(); } @Override protected void onPostExecute(Long result) { // TODO Auto-generated method stub //super.onPostExecute(result); if(mDialog!=null&&mDialog.isShowing()){ mDialog.dismiss(); } if(isCancelled()) return; } @Override protected void onPreExecute() { // TODO Auto-generated method stub //super.onPreExecute(); if(mDialog!=null){ mDialog.setTitle("Extracting"); mDialog.setMessage(mInput.getName()); mDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL); mDialog.setOnCancelListener(new OnCancelListener() { @Override public void onCancel(DialogInterface dialog) { // TODO Auto-generated method stub cancel(true); } }); mDialog.show(); } } @Override protected void onProgressUpdate(Integer... values) { // TODO Auto-generated method stub //super.onProgressUpdate(values); if(mDialog==null) return; if(values.length>1){ int max=values[1]; mDialog.setMax(max); } else mDialog.setProgress(values[0].intValue()); } private long unzip(){ long extractedSize = 0L; Enumeration<ZipEntry> entries; ZipFile zip = null; try { zip = new ZipFile(mInput); long uncompressedSize = getOriginalSize(zip); publishProgress(0, (int) uncompressedSize); entries = (Enumeration<ZipEntry>) zip.entries(); while(entries.hasMoreElements()){ ZipEntry entry = entries.nextElement(); if(entry.isDirectory()){ continue; } File destination = new File(mOutput, entry.getName()); if(!destination.getParentFile().exists()){ Log.e(TAG, "make="+destination.getParentFile().getAbsolutePath()); destination.getParentFile().mkdirs(); } if(destination.exists()&&mContext!=null&&!mReplaceAll){ } ProgressReportingOutputStream outStream = new ProgressReportingOutputStream(destination); extractedSize+=copy(zip.getInputStream(entry),outStream); outStream.close(); } } catch (ZipException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); }finally{ try { zip.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } return extractedSize; } private long getOriginalSize(ZipFile file){ Enumeration<ZipEntry> entries = (Enumeration<ZipEntry>) file.entries(); long originalSize = 0l; while(entries.hasMoreElements()){ ZipEntry entry = entries.nextElement(); if(entry.getSize()>=0){ originalSize+=entry.getSize(); } } return originalSize; } private int copy(InputStream input, OutputStream output){ byte[] buffer = new byte[1024*8]; BufferedInputStream in = new BufferedInputStream(input, 1024*8); BufferedOutputStream out = new BufferedOutputStream(output, 1024*8); int count =0,n=0; try { while((n=in.read(buffer, 0, 1024*8))!=-1){ out.write(buffer, 0, n); count+=n; } out.flush(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); }finally{ try { out.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } try { in.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } return count; } private final class ProgressReportingOutputStream extends FileOutputStream{ public ProgressReportingOutputStream(File file) throws FileNotFoundException { super(file); // TODO Auto-generated constructor stub } @Override public void write(byte[] buffer, int byteOffset, int byteCount) throws IOException { // TODO Auto-generated method stub super.write(buffer, byteOffset, byteCount); mProgress += byteCount; publishProgress(mProgress); } } }
权限：
<uses-permission android:name="android.permission.INTERNET" /> <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> <!-- 创建和删除文件 --> <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" /> <!-- 写文件 --> <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.READ_PHONE_STATE" /> <uses-permission android:name="android.permission.VIBRATE" /> <uses-permission android:name="android.permission.READ_APN_SETTINGS" /> <uses-permission android:name="android.permission.RESTART_PACKAGES"/> <!-- 统计 --> <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" /> <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> <uses-permission android:name="android.permission.READ_PHONE_STATE" /> <uses-permission android:name="android.permission.READ_LOGS" /> <uses-permission android:name="android.permission.WAKE_LOCK" /> <uses-permission android:name="android.permission.CHANGE_CONFIGURATION" />
源码下载：点击这里
总结
以上就是这篇文章的全部内容了，希望这篇文章对各位Android开发者们能带来一定的帮助，如果有疑问大家可以留言交流，谢谢大家对能带来一定的帮助。
勤勉是通往胜利的必经之路。要是由于胆怯艰难而去另觅佳径，
