blocks|key|1183751|text|Android有内置的Java+API。查看java.util.zip包。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1183752|ZipInputStream类是您应该研究的内容。从ZipInputStream中读取ZipEntry并将其转储到文件系统/文件夹中。检查similar+example+to+compress+into+zip文件。|1183753|entityMap|0|LINK|mutability|MUTABLE|url|http://developer.android.com/reference/java/util/zip/package-summary.html|1|http://developer.android.com/reference/java/util/zip/ZipInputStream.html|2|http://www.jondev.net/articles/Zipping_Files_with_Android_(Programmatically)^0|M|D|0|0|0|E|1|1X|10|2|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@$A|S|B|T|1|U]]|C|$]]|$1|D|3|E|5|6|7|V|8|@]|9|@$A|W|B|X|1|Y]|$A|Z|B|10|1|11]]|C|$]]|$1|F|3|-4|5|6|7|12|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]|N|$5|I|J|K|C|$L|O]]|P|$5|I|J|K|C|$L|Q]]]]

Android has build-in Java API. Check out <a href="http://developer.android.com/reference/java/util/zip/package-summary.html" rel="noreferrer">java.util.zip</a> package.

The class <a href="http://developer.android.com/reference/java/util/zip/ZipInputStream.html" rel="noreferrer">ZipInputStream</a> is what you should look into. Read ZipEntry from the ZipInputStream and dump it into filesystem/folder. Check <a href="http://www.jondev.net/articles/Zipping_Files_with_Android_(Programmatically)" rel="noreferrer">similar example to compress into zip</a> file.

blocks|key|1183777|text|这是我的解压缩方法，我使用它：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1183778|private+boolean+unpackZip(String+path,+String+zipname)
{+++++++
+++++InputStream+is;
+++++ZipInputStream+zis;
+++++try+
+++++{
+++++++++is+=+new+FileInputStream(path+%2B+zipname);
+++++++++zis+=+new+ZipInputStream(new+BufferedInputStream(is));++++++++++
+++++++++ZipEntry+ze;

+++++++++while((ze+=+zis.getNextEntry())+!=+null)+
+++++++++{
+++++++++++++ByteArrayOutputStream+baos+=+new+ByteArrayOutputStream();
+++++++++++++byte[]+buffer+=+new+byte[1024];
+++++++++++++int+count;

+++++++++++++String+filename+=+ze.getName();
+++++++++++++FileOutputStream+fout+=+new+FileOutputStream(path+%2B+filename);

+++++++++++++//+reading+and+writing
+++++++++++++while((count+=+zis.read(buffer))+!=+-1)+
+++++++++++++{
+++++++++++++++++baos.write(buffer,+0,+count);
+++++++++++++++++byte[]+bytes+=+baos.toByteArray();
+++++++++++++++++fout.write(bytes);+++++++++++++
+++++++++++++++++baos.reset();
+++++++++++++}

+++++++++++++fout.close();+++++++++++++++
+++++++++++++zis.closeEntry();
+++++++++}

+++++++++zis.close();
+++++}+
+++++catch(IOException+e)
+++++{
+++++++++e.printStackTrace();
+++++++++return+false;
+++++}

++++return+true;
}|code-block|syntax|javascript|1183779|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This is my unzip method, which I use:

<pre><code>private boolean unpackZip(String path, String zipname)
{ 
 InputStream is;
 ZipInputStream zis;
 try 
 {
 is = new FileInputStream(path + zipname);
 zis = new ZipInputStream(new BufferedInputStream(is)); 
 ZipEntry ze;

 while((ze = zis.getNextEntry()) != null) 
 {
 ByteArrayOutputStream baos = new ByteArrayOutputStream();
 byte[] buffer = new byte[1024];
 int count;

 String filename = ze.getName();
 FileOutputStream fout = new FileOutputStream(path + filename);

 // reading and writing
 while((count = zis.read(buffer)) != -1) 
 {
 baos.write(buffer, 0, count);
 byte[] bytes = baos.toByteArray();
 fout.write(bytes); 
 baos.reset();
 }

 fout.close(); 
 zis.closeEntry();
 }

 zis.close();
 } 
 catch(IOException e)
 {
 e.printStackTrace();
 return false;
 }

 return true;
}
</code></pre>

blocks|key|1183802|text|下面是一个ZipFileIterator+(类似于java迭代器，但用于压缩文件)：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1183803|package+ch.epfl.bbp.io;

import+java.io.BufferedInputStream;
import+java.io.ByteArrayOutputStream;
import+java.io.File;
import+java.io.FileInputStream;
import+java.io.FileNotFoundException;
import+java.io.FileOutputStream;
import+java.io.IOException;
import+java.util.Iterator;
import+java.util.zip.ZipEntry;
import+java.util.zip.ZipInputStream;

public+class+ZipFileIterator+implements+Iterator<File>+{

++++private+byte[]+buffer+=+new+byte[1024];

++++private+FileInputStream+is;
++++private+ZipInputStream+zis;
++++private+ZipEntry+ze;

++++public+ZipFileIterator(File+file)+throws+FileNotFoundException+{
++++is+=+new+FileInputStream(file);
++++zis+=+new+ZipInputStream(new+BufferedInputStream(is));
++++}

++++@Override
++++public+boolean+hasNext()+{
++++try+{
++++++++return+(ze+=+zis.getNextEntry())+!=+null;
++++}+catch+(IOException+e)+{
++++++++e.printStackTrace();
++++}
++++return+false;
++++}

++++@Override
++++public+File+next()+{
++++try+{
++++++++ByteArrayOutputStream+baos+=+new+ByteArrayOutputStream();
++++++++int+count;

++++++++String+filename+=+ze.getName();
++++++++File+tmpFile+=+File.createTempFile(filename,+"tmp");
++++++++tmpFile.deleteOnExit();//+TODO+make+it+configurable
++++++++FileOutputStream+fout+=+new+FileOutputStream(tmpFile);

++++++++while+((count+=+zis.read(buffer))+!=+-1)+{
++++++++baos.write(buffer,+0,+count);
++++++++byte[]+bytes+=+baos.toByteArray();
++++++++fout.write(bytes);
++++++++baos.reset();
++++++++}
++++++++fout.close();
++++++++zis.closeEntry();

++++++++return+tmpFile;

++++}+catch+(Exception+e)+{
++++++++throw+new+RuntimeException(e);
++++}
++++}

++++@Override
++++public+void+remove()+{
++++throw+new+RuntimeException("not+implemented");
++++}

++++public+void+close()+{
++++try+{
++++++++zis.close();
++++++++is.close();
++++}+catch+(IOException+e)+{//+nope
++++}
++++}
}|code-block|syntax|javascript|1183804|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Here is a ZipFileIterator (like a java Iterator, but for zip files):

<pre><code>package ch.epfl.bbp.io;

import java.io.BufferedInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Iterator;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;

public class ZipFileIterator implements Iterator&lt;File&gt; {

 private byte[] buffer = new byte[1024];

 private FileInputStream is;
 private ZipInputStream zis;
 private ZipEntry ze;

 public ZipFileIterator(File file) throws FileNotFoundException {
 is = new FileInputStream(file);
 zis = new ZipInputStream(new BufferedInputStream(is));
 }

 @Override
 public boolean hasNext() {
 try {
 return (ze = zis.getNextEntry()) != null;
 } catch (IOException e) {
 e.printStackTrace();
 }
 return false;
 }

 @Override
 public File next() {
 try {
 ByteArrayOutputStream baos = new ByteArrayOutputStream();
 int count;

 String filename = ze.getName();
 File tmpFile = File.createTempFile(filename, "tmp");
 tmpFile.deleteOnExit();// TODO make it configurable
 FileOutputStream fout = new FileOutputStream(tmpFile);

 while ((count = zis.read(buffer)) != -1) {
 baos.write(buffer, 0, count);
 byte[] bytes = baos.toByteArray();
 fout.write(bytes);
 baos.reset();
 }
 fout.close();
 zis.closeEntry();

 return tmpFile;

 } catch (Exception e) {
 throw new RuntimeException(e);
 }
 }

 @Override
 public void remove() {
 throw new RuntimeException("not implemented");
 }

 public void close() {
 try {
 zis.close();
 is.close();
 } catch (IOException e) {// nope
 }
 }
}
</code></pre>

blocks|key|969481|text|对peno的版本进行了一些优化。性能的提高是显而易见的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|969482|private+boolean+unpackZip(String+path,+String+zipname)
{+++++++
+++++InputStream+is;
+++++ZipInputStream+zis;
+++++try+
+++++{
+++++++++String+filename;
+++++++++is+=+new+FileInputStream(path+%2B+zipname);
+++++++++zis+=+new+ZipInputStream(new+BufferedInputStream(is));++++++++++
+++++++++ZipEntry+ze;
+++++++++byte[]+buffer+=+new+byte[1024];
+++++++++int+count;

+++++++++while+((ze+=+zis.getNextEntry())+!=+null)+
+++++++++{
+++++++++++++filename+=+ze.getName();

+++++++++++++//+Need+to+create+directories+if+not+exists,+or
+++++++++++++//+it+will+generate+an+Exception...
+++++++++++++if+(ze.isDirectory())+{
++++++++++++++++File+fmd+=+new+File(path+%2B+filename);
++++++++++++++++fmd.mkdirs();
++++++++++++++++continue;
+++++++++++++}

+++++++++++++FileOutputStream+fout+=+new+FileOutputStream(path+%2B+filename);

+++++++++++++while+((count+=+zis.read(buffer))+!=+-1)+
+++++++++++++{
+++++++++++++++++fout.write(buffer,+0,+count);+++++++++++++
+++++++++++++}

+++++++++++++fout.close();+++++++++++++++
+++++++++++++zis.closeEntry();
+++++++++}

+++++++++zis.close();
+++++}+
+++++catch(IOException+e)
+++++{
+++++++++e.printStackTrace();
+++++++++return+false;
+++++}

++++return+true;
}|code-block|syntax|javascript|969483|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Had peno's version optimised a bit. The increase in performance is perceptible.

<pre><code>private boolean unpackZip(String path, String zipname)
{ 
 InputStream is;
 ZipInputStream zis;
 try 
 {
 String filename;
 is = new FileInputStream(path + zipname);
 zis = new ZipInputStream(new BufferedInputStream(is)); 
 ZipEntry ze;
 byte[] buffer = new byte[1024];
 int count;

 while ((ze = zis.getNextEntry()) != null) 
 {
 filename = ze.getName();

 // Need to create directories if not exists, or
 // it will generate an Exception...
 if (ze.isDirectory()) {
 File fmd = new File(path + filename);
 fmd.mkdirs();
 continue;
 }

 FileOutputStream fout = new FileOutputStream(path + filename);

 while ((count = zis.read(buffer)) != -1) 
 {
 fout.write(buffer, 0, count); 
 }

 fout.close(); 
 zis.closeEntry();
 }

 zis.close();
 } 
 catch(IOException e)
 {
 e.printStackTrace();
 return false;
 }

 return true;
}
</code></pre>

blocks|key|969543|text|虽然已经在这里的答案工作得很好，但我发现它们比我希望的要慢一点。相反，我使用了zip4j，我认为这是最好的解决方案，因为它的速度。它还允许对压缩量进行不同的选择，我发现这很有用。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|969544|entityMap|0|LINK|mutability|MUTABLE|url|http://www.lingala.net/zip4j/^0|13|5|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

While the answers that are already here work well, I found that they were slightly slower than I had hoped for. Instead I used <a href="http://www.lingala.net/zip4j/" rel="noreferrer">zip4j</a>, which I think is the best solution because of its speed. It also allowed for different options for the amount of compression, which I found useful.

blocks|key|1183991|text|public+class+MainActivity+extends+Activity+{

private+String+LOG_TAG+=+MainActivity.class.getSimpleName();

private+File+zipFile;
private+File+destination;

private+TextView+status;

@Override
protected+void+onCreate(Bundle+savedInstanceState)+{
++++super.onCreate(savedInstanceState);
++++setContentView(R.layout.activity_main);

++++status+=+(TextView)+findViewById(R.id.main_status);
++++status.setGravity(Gravity.CENTER);

++++if+(+initialize()+)+{
++++++++zipFile+=+new+File(destination,+"BlueBoxnew.zip");
++++++++try+{
++++++++++++Unzipper.unzip(zipFile,+destination);
++++++++++++status.setText("Extracted+to+\n"%2Bdestination.getAbsolutePath());
++++++++}+catch+(ZipException+e)+{
++++++++++++Log.e(LOG_TAG,+e.getMessage());
++++++++}+catch+(IOException+e)+{
++++++++++++Log.e(LOG_TAG,+e.getMessage());
++++++++}
++++}+else+{
++++++++status.setText("Unable+to+initialize+sd+card.");
++++}
}

public+boolean+initialize()+{
++++boolean+result+=+false;
+++++File+sdCard+=+new+File(Environment.getExternalStorageDirectory()%2B"/zip/");
++++//File+sdCard+=+Environment.getExternalStorageDirectory();
++++if+(+sdCard+!=+null+)+{
++++++++destination+=+sdCard;
++++++++if+(+!destination.exists()+)+{
++++++++++++if+(+destination.mkdir()+)+{
++++++++++++++++result+=+true;
++++++++++++}
++++++++}+else+{
++++++++++++result+=+true;
++++++++}
++++}

++++return+result;
}

+}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1183992|->Helper类(Unzipper.java)|unstyled|1183993|++++import+java.io.File;
++++import+java.io.FileInputStream;
+++import+java.io.FileOutputStream;
++++import+java.io.IOException;
+++++++import+java.util.zip.ZipEntry;
++++import+java.util.zip.ZipException;
++++import+java.util.zip.ZipInputStream;
+++++import+android.util.Log;

+++public+class+Unzipper+{

private+static+String+LOG_TAG+=+Unzipper.class.getSimpleName();

public+static+void+unzip(final+File+file,+final+File+destination)+throws+ZipException,+IOException+{
++++new+Thread()+{
++++++++public+void+run()+{
++++++++++++long+START_TIME+=+System.currentTimeMillis();
++++++++++++long+FINISH_TIME+=+0;
++++++++++++long+ELAPSED_TIME+=+0;
++++++++++++try+{
++++++++++++++++ZipInputStream+zin+=+new+ZipInputStream(new+FileInputStream(file));
++++++++++++++++String+workingDir+=+destination.getAbsolutePath()%2B"/";

++++++++++++++++byte+buffer[]+=+new+byte[4096];
++++++++++++++++int+bytesRead;
++++++++++++++++ZipEntry+entry+=+null;
++++++++++++++++while+((entry+=+zin.getNextEntry())+!=+null)+{
++++++++++++++++++++if+(entry.isDirectory())+{
++++++++++++++++++++++++File+dir+=+new+File(workingDir,+entry.getName());
++++++++++++++++++++++++if+(!dir.exists())+{
++++++++++++++++++++++++++++dir.mkdir();
++++++++++++++++++++++++}
++++++++++++++++++++++++Log.i(LOG_TAG,+"[DIR]+"%2Bentry.getName());
++++++++++++++++++++}+else+{
++++++++++++++++++++++++FileOutputStream+fos+=+new+FileOutputStream(workingDir+%2B+entry.getName());
++++++++++++++++++++++++while+((bytesRead+=+zin.read(buffer))+!=+-1)+{
++++++++++++++++++++++++++++fos.write(buffer,+0,+bytesRead);
++++++++++++++++++++++++}
++++++++++++++++++++++++fos.close();
++++++++++++++++++++++++Log.i(LOG_TAG,+"[FILE]+"%2Bentry.getName());
++++++++++++++++++++}
++++++++++++++++}
++++++++++++++++zin.close();

++++++++++++++++FINISH_TIME+=+System.currentTimeMillis();
++++++++++++++++ELAPSED_TIME+=+FINISH_TIME+-+START_TIME;
++++++++++++++++Log.i(LOG_TAG,+"COMPLETED+in+"%2B(ELAPSED_TIME/1000)%2B"+seconds.");
++++++++++++}+catch+(Exception+e)+{
++++++++++++++++Log.e(LOG_TAG,+"FAILED");
++++++++++++}
++++++++};
++++}.start();
}

+++}|1183994|->xml布局(activity_main.xml)：|1183995|<RelativeLayout+xmlns:android="http://schemas.android.com/apk/res/android"
+++xmlns:tools="http://schemas.android.com/tools"
+++android:layout_width="match_parent"
+android:layout_height="match_parent"
+tools:context=".MainActivity"+>

<TextView
++++android:id="@%2Bid/main_status"
++++android:layout_width="wrap_content"
++++android:layout_height="wrap_content"
++++android:layout_centerHorizontal="true"
++++android:layout_centerVertical="true"
++++android:text="@string/hello_world"+/>

</RelativeLayout>|1183996|Menifest文件中的->permission：|1183997|<uses-permission+android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>|1183998|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|T|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|U|8|@]|9|@]|A|$B|C]]|$1|I|3|J|5|F|7|V|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|W|8|@]|9|@]|A|$B|C]]|$1|M|3|N|5|F|7|X|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|Y|8|@]|9|@]|A|$B|C]]|$1|Q|3|-4|5|F|7|Z|8|@]|9|@]|A|$]]]|R|$]]

<pre><code>public class MainActivity extends Activity {

private String LOG_TAG = MainActivity.class.getSimpleName();

private File zipFile;
private File destination;

private TextView status;

@Override
protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);

 status = (TextView) findViewById(R.id.main_status);
 status.setGravity(Gravity.CENTER);

 if ( initialize() ) {
 zipFile = new File(destination, "BlueBoxnew.zip");
 try {
 Unzipper.unzip(zipFile, destination);
 status.setText("Extracted to \n"+destination.getAbsolutePath());
 } catch (ZipException e) {
 Log.e(LOG_TAG, e.getMessage());
 } catch (IOException e) {
 Log.e(LOG_TAG, e.getMessage());
 }
 } else {
 status.setText("Unable to initialize sd card.");
 }
}

public boolean initialize() {
 boolean result = false;
 File sdCard = new File(Environment.getExternalStorageDirectory()+"/zip/");
 //File sdCard = Environment.getExternalStorageDirectory();
 if ( sdCard != null ) {
 destination = sdCard;
 if ( !destination.exists() ) {
 if ( destination.mkdir() ) {
 result = true;
 }
 } else {
 result = true;
 }
 }

 return result;
}

 }
</code></pre>

->Helper Class(Unzipper.java)

<pre><code> import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.util.zip.ZipEntry;
 import java.util.zip.ZipException;
 import java.util.zip.ZipInputStream;
 import android.util.Log;

 public class Unzipper {

private static String LOG_TAG = Unzipper.class.getSimpleName();

public static void unzip(final File file, final File destination) throws ZipException, IOException {
 new Thread() {
 public void run() {
 long START_TIME = System.currentTimeMillis();
 long FINISH_TIME = 0;
 long ELAPSED_TIME = 0;
 try {
 ZipInputStream zin = new ZipInputStream(new FileInputStream(file));
 String workingDir = destination.getAbsolutePath()+"/";

 byte buffer[] = new byte[4096];
 int bytesRead;
 ZipEntry entry = null;
 while ((entry = zin.getNextEntry()) != null) {
 if (entry.isDirectory()) {
 File dir = new File(workingDir, entry.getName());
 if (!dir.exists()) {
 dir.mkdir();
 }
 Log.i(LOG_TAG, "[DIR] "+entry.getName());
 } else {
 FileOutputStream fos = new FileOutputStream(workingDir + entry.getName());
 while ((bytesRead = zin.read(buffer)) != -1) {
 fos.write(buffer, 0, bytesRead);
 }
 fos.close();
 Log.i(LOG_TAG, "[FILE] "+entry.getName());
 }
 }
 zin.close();

 FINISH_TIME = System.currentTimeMillis();
 ELAPSED_TIME = FINISH_TIME - START_TIME;
 Log.i(LOG_TAG, "COMPLETED in "+(ELAPSED_TIME/1000)+" seconds.");
 } catch (Exception e) {
 Log.e(LOG_TAG, "FAILED");
 }
 };
 }.start();
}

 }
</code></pre>

->xml layout(activity_main.xml):

<pre><code>&lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 tools:context=".MainActivity" &gt;

&lt;TextView
 android:id="@+id/main_status"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_centerHorizontal="true"
 android:layout_centerVertical="true"
 android:text="@string/hello_world" /&gt;

&lt;/RelativeLayout&gt;
</code></pre>

->permission in Menifest file:

<pre><code>&lt;uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/&gt;
</code></pre>

blocks|key|969674|text|根据@zapl+answer，解压进度报告：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|969675|public+interface+UnzipFile_Progress
{
++++void+Progress(int+percent,+String+FileName);
}

//+unzip(new+File("/sdcard/pictures.zip"),+new+File("/sdcard"));
public+static+void+UnzipFile(File+zipFile,+File+targetDirectory,+UnzipFile_Progress+progress)+throws+IOException,
++++++++FileNotFoundException
{
++++long+total_len+=+zipFile.length();
++++long+total_installed_len+=+0;

++++ZipInputStream+zis+=+new+ZipInputStream(new+BufferedInputStream(new+FileInputStream(zipFile)));
++++try
++++{
++++++++ZipEntry+ze;
++++++++int+count;
++++++++byte[]+buffer+=+new+byte[1024];
++++++++while+((ze+=+zis.getNextEntry())+!=+null)
++++++++{
++++++++++++if+(progress+!=+null)
++++++++++++{
++++++++++++++++total_installed_len+%2B=+ze.getCompressedSize();
++++++++++++++++String+file_name+=+ze.getName();
++++++++++++++++int+percent+=+(int)(total_installed_len+*+100+/+total_len);
++++++++++++++++progress.Progress(percent,+file_name);
++++++++++++}

++++++++++++File+file+=+new+File(targetDirectory,+ze.getName());
++++++++++++File+dir+=+ze.isDirectory()+?+file+:+file.getParentFile();
++++++++++++if+(!dir.isDirectory()+&&+!dir.mkdirs())
++++++++++++++++throw+new+FileNotFoundException("Failed+to+ensure+directory:+"+%2B+dir.getAbsolutePath());
++++++++++++if+(ze.isDirectory())
++++++++++++++++continue;
++++++++++++FileOutputStream+fout+=+new+FileOutputStream(file);
++++++++++++try
++++++++++++{
++++++++++++++++while+((count+=+zis.read(buffer))+!=+-1)
++++++++++++++++++++fout.write(buffer,+0,+count);
++++++++++++}+finally
++++++++++++{
++++++++++++++++fout.close();
++++++++++++}

++++++++++++//+if+time+should+be+restored+as+well
++++++++++++long+time+=+ze.getTime();
++++++++++++if+(time+>+0)
++++++++++++++++file.setLastModified(time);
++++++++}
++++}+finally
++++{
++++++++zis.close();
++++}
}|code-block|syntax|javascript|969676|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

According to @zapl answer,Unzip with progress report:

<pre><code>public interface UnzipFile_Progress
{
 void Progress(int percent, String FileName);
}

// unzip(new File("/sdcard/pictures.zip"), new File("/sdcard"));
public static void UnzipFile(File zipFile, File targetDirectory, UnzipFile_Progress progress) throws IOException,
 FileNotFoundException
{
 long total_len = zipFile.length();
 long total_installed_len = 0;

 ZipInputStream zis = new ZipInputStream(new BufferedInputStream(new FileInputStream(zipFile)));
 try
 {
 ZipEntry ze;
 int count;
 byte[] buffer = new byte[1024];
 while ((ze = zis.getNextEntry()) != null)
 {
 if (progress != null)
 {
 total_installed_len += ze.getCompressedSize();
 String file_name = ze.getName();
 int percent = (int)(total_installed_len * 100 / total_len);
 progress.Progress(percent, file_name);
 }

 File file = new File(targetDirectory, ze.getName());
 File dir = ze.isDirectory() ? file : file.getParentFile();
 if (!dir.isDirectory() &amp;&amp; !dir.mkdirs())
 throw new FileNotFoundException("Failed to ensure directory: " + dir.getAbsolutePath());
 if (ze.isDirectory())
 continue;
 FileOutputStream fout = new FileOutputStream(file);
 try
 {
 while ((count = zis.read(buffer)) != -1)
 fout.write(buffer, 0, count);
 } finally
 {
 fout.close();
 }

 // if time should be restored as well
 long time = ze.getTime();
 if (time &gt; 0)
 file.setLastModified(time);
 }
 } finally
 {
 zis.close();
 }
}
</code></pre>

blocks|key|1184077|text|使用以下类|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1184078|++++import+java.io.BufferedOutputStream;
++++import+java.io.File;
++++import+java.io.FileInputStream;
++++import+java.io.FileOutputStream;
++++import+java.util.zip.ZipEntry;
++++import+java.util.zip.ZipInputStream;
++++import+android.util.Log;

++++public+class+DecompressFast+{



+private+String+_zipFile;+
++private+String+_location;+
+
++public+DecompressFast(String+zipFile,+String+location)+{+
++++_zipFile+=+zipFile;+
++++_location+=+location;+
+
++++_dirChecker("");+
++}+
+
++public+void+unzip()+{+
++++try++{+
++++++FileInputStream+fin+=+new+FileInputStream(_zipFile);+
++++++ZipInputStream+zin+=+new+ZipInputStream(fin);+
++++++ZipEntry+ze+=+null;+
++++++while+((ze+=+zin.getNextEntry())+!=+null)+{+
++++++++Log.v("Decompress",+"Unzipping+"+%2B+ze.getName());+
+
++++++++if(ze.isDirectory())+{+
++++++++++_dirChecker(ze.getName());+
++++++++}+else+{+
++++++++++FileOutputStream+fout+=+new+FileOutputStream(_location+%2B+ze.getName());+
+++++++++BufferedOutputStream+bufout+=+new+BufferedOutputStream(fout);
++++++++++byte[]+buffer+=+new+byte[1024];
++++++++++int+read+=+0;
++++++++++while+((read+=+zin.read(buffer))+!=+-1)+{
++++++++++++++bufout.write(buffer,+0,+read);
++++++++++}

++++++++++
++++++++++
++++++++++
++++++++++bufout.close();
++++++++++
++++++++++zin.closeEntry();+
++++++++++fout.close();+
++++++++}+
+++++++++
++++++}+
++++++zin.close();+
++++++
++++++
++++++Log.d("Unzip",+"Unzipping+complete.+path+:++"+%2B_location+);
++++}+catch(Exception+e)+{+
++++++Log.e("Decompress",+"unzip",+e);+
++++++
++++++Log.d("Unzip",+"Unzipping+failed");
++++}+
+
++}+
+
++private+void+_dirChecker(String+dir)+{+
++++File+f+=+new+File(_location+%2B+dir);+
+
++++if(!f.isDirectory())+{+
++++++f.mkdirs();+
++++}+
++}+


+}|code-block|syntax|javascript|1184079|如何使用|1184080|+String+zipFile+=+Environment.getExternalStorageDirectory()+%2B+"/the_raven.zip";+//your+zip+file+location
++++String+unzipLocation+=+Environment.getExternalStorageDirectory()+%2B+"/unzippedtestNew/";+//+destination+folder+location
++DecompressFast+df=+new+DecompressFast(zipFile,+unzipLocation);
++++df.unzip();|1184081|权限|1184082|+<uses-permission+android:name="android.permission.WRITE_EXTERNAL_STORAGE"+/>
+<uses-permission+android:name="android.permission.READ_EXTERNAL_STORAGE"+/>|1184083|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

use the following class
<pre><code> import java.io.BufferedOutputStream;
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileOutputStream;
 import java.util.zip.ZipEntry;
 import java.util.zip.ZipInputStream;
 import android.util.Log;

 public class DecompressFast {



 private String _zipFile; 
 private String _location; 
 
 public DecompressFast(String zipFile, String location) { 
 _zipFile = zipFile; 
 _location = location; 
 
 _dirChecker(&quot;&quot;); 
 } 
 
 public void unzip() { 
 try { 
 FileInputStream fin = new FileInputStream(_zipFile); 
 ZipInputStream zin = new ZipInputStream(fin); 
 ZipEntry ze = null; 
 while ((ze = zin.getNextEntry()) != null) { 
 Log.v(&quot;Decompress&quot;, &quot;Unzipping &quot; + ze.getName()); 
 
 if(ze.isDirectory()) { 
 _dirChecker(ze.getName()); 
 } else { 
 FileOutputStream fout = new FileOutputStream(_location + ze.getName()); 
 BufferedOutputStream bufout = new BufferedOutputStream(fout);
 byte[] buffer = new byte[1024];
 int read = 0;
 while ((read = zin.read(buffer)) != -1) {
 bufout.write(buffer, 0, read);
 }

 
 
 
 bufout.close();
 
 zin.closeEntry(); 
 fout.close(); 
 } 
 
 } 
 zin.close(); 
 
 
 Log.d(&quot;Unzip&quot;, &quot;Unzipping complete. path : &quot; +_location );
 } catch(Exception e) { 
 Log.e(&quot;Decompress&quot;, &quot;unzip&quot;, e); 
 
 Log.d(&quot;Unzip&quot;, &quot;Unzipping failed&quot;);
 } 
 
 } 
 
 private void _dirChecker(String dir) { 
 File f = new File(_location + dir); 
 
 if(!f.isDirectory()) { 
 f.mkdirs(); 
 } 
 } 


 }
</code></pre>
How to use
<pre><code> String zipFile = Environment.getExternalStorageDirectory() + &quot;/the_raven.zip&quot;; //your zip file location
 String unzipLocation = Environment.getExternalStorageDirectory() + &quot;/unzippedtestNew/&quot;; // destination folder location
 DecompressFast df= new DecompressFast(zipFile, unzipLocation);
 df.unzip();
</code></pre>
Permissions
<pre><code> &lt;uses-permission android:name=&quot;android.permission.WRITE_EXTERNAL_STORAGE&quot; /&gt;
 &lt;uses-permission android:name=&quot;android.permission.READ_EXTERNAL_STORAGE&quot; /&gt;
</code></pre>

blocks|key|1184132|text|我用来从我的zipfile解压特定文件到我的应用程序缓存文件夹的最小示例。然后，我使用不同的方法读取清单文件。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1184133|private+void+unzipUpdateToCache()+{
++++ZipInputStream+zipIs+=+new+ZipInputStream(context.getResources().openRawResource(R.raw.update));
++++ZipEntry+ze+=+null;

++++try+{

++++++++while+((ze+=+zipIs.getNextEntry())+!=+null)+{
++++++++++++if+(ze.getName().equals("update/manifest.json"))+{
++++++++++++++++FileOutputStream+fout+=+new+FileOutputStream(context.getCacheDir().getAbsolutePath()+%2B+"/manifest.json");

++++++++++++++++byte[]+buffer+=+new+byte[1024];
++++++++++++++++int+length+=+0;

++++++++++++++++while+((length+=+zipIs.read(buffer))>0)+{
++++++++++++++++++++fout.write(buffer,+0,+length);
++++++++++++++++}
++++++++++++++++zipIs+.closeEntry();
++++++++++++++++fout.close();
++++++++++++}
++++++++}
++++++++zipIs+.close();

++++}+catch+(IOException+e)+{
++++++++e.printStackTrace();
++++}

}|code-block|syntax|javascript|1184134|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Minimal example I used to unzip a specific file from my zipfile into my applications cache folder. I then read the manifest file using a different method.

<pre><code>private void unzipUpdateToCache() {
 ZipInputStream zipIs = new ZipInputStream(context.getResources().openRawResource(R.raw.update));
 ZipEntry ze = null;

 try {

 while ((ze = zipIs.getNextEntry()) != null) {
 if (ze.getName().equals("update/manifest.json")) {
 FileOutputStream fout = new FileOutputStream(context.getCacheDir().getAbsolutePath() + "/manifest.json");

 byte[] buffer = new byte[1024];
 int length = 0;

 while ((length = zipIs.read(buffer))&gt;0) {
 fout.write(buffer, 0, length);
 }
 zipIs .closeEntry();
 fout.close();
 }
 }
 zipIs .close();

 } catch (IOException e) {
 e.printStackTrace();
 }

}
</code></pre>

blocks|key|969774|text|以下是@arsent解决方案的更简明版本：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|969775|fun+File.unzip(to:+File?+=+null)+{
++++val+destinationDir+=+to+?:+File(parentFile,+nameWithoutExtension)
++++destinationDir.mkdirs()

++++ZipFile(this).use+{+zipFile+->
++++++++zipFile
++++++++++++.entries()
++++++++++++.asSequence()
++++++++++++.filter+{+!it.isDirectory+}
++++++++++++.forEach+{+zipEntry+->
++++++++++++++++val+currFile+=+File(destinationDir,+zipEntry.name)
++++++++++++++++currFile.parentFile?.mkdirs()
++++++++++++++++zipFile.getInputStream(zipEntry).use+{+input+->
++++++++++++++++++++currFile.outputStream().use+{+output+->+input.copyTo(output)+}
++++++++++++++++}
++++++++++++}
++++}
}|code-block|syntax|javascript|969776|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Here is more concise version of @arsent solution:
<pre><code>fun File.unzip(to: File? = null) {
 val destinationDir = to ?: File(parentFile, nameWithoutExtension)
 destinationDir.mkdirs()

 ZipFile(this).use { zipFile -&gt;
 zipFile
 .entries()
 .asSequence()
 .filter { !it.isDirectory }
 .forEach { zipEntry -&gt;
 val currFile = File(destinationDir, zipEntry.name)
 currFile.parentFile?.mkdirs()
 zipFile.getInputStream(zipEntry).use { input -&gt;
 currFile.outputStream().use { output -&gt; input.copyTo(output) }
 }
 }
 }
}
</code></pre>

I need a small code snippet which unzips a few files from a given .zip file and gives the separate files according to the format they were in the zipped file. Please post your knowledge and help me out.

How to unzip files programmatically in Android?

文件系统

Android

Java

我需要一个小的代码片段，从一个给定的.zip文件解压几个文件，并给出单独的文件，根据它们在压缩文件中的格式。请张贴你的知识，并帮助我。

问如何在Android中以编程方式解压缩文件？
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