android数据存储之文件存储方法

 /**   * openFIleOutput ,openFileInput   * 这两种方法同sp一样只能讲文件保存到手机内存固定的路径中，   * 默认为 /data/data/<packageName>/files   */  private void save2File() {    try {      //向文件写入内容      FileOutputStream os = openFileOutput("file.txt", Context.MODE_PRIVATE);      String text = "写数据到文件";      os.write(text.getBytes("utf-8"));      //关闭流      os.close();    } catch (FileNotFoundException e) {      e.printStackTrace();    } catch (UnsupportedEncodingException e) {      e.printStackTrace();    } catch (IOException e) {      e.printStackTrace();    }  }  /**   *   */  private void readFile() {    try {      FileInputStream ins = openFileInput("file.txt");      byte[] buffer = new byte[100];      int byteCount = ins.read(buffer);      String text = new String(buffer,0,byteCount,"utf-8");      Toast.makeText(this,text,Toast.LENGTH_SHORT).show();      ins.close();    } catch (FileNotFoundException e) {      e.printStackTrace();    } catch (IOException e) {      e.printStackTrace();    }  }

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  xmlns:tools="http://schemas.android.com/tools"  android:id="@+id/LinearLayout1"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:orientation="vertical"  tools:context="com.jay.example.filedemo2.MainActivity">  <TextView    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:text="清输入文件名" />  <EditText    android:id="@+id/edittitle"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:hint="文件名" />  <TextView    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:text="清输入文件内容" />  <EditText    android:id="@+id/editdetail"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:hint="文件内容" />  <Button    android:id="@+id/btnsave"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:text="保存到SD卡" />  <Button    android:id="@+id/btnclean"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:text="清空" />  <Button    android:id="@+id/btnread"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:text="读取sd卡中的文件" /></LinearLayout>

public class SDFileHelper {  private Context context;  public SDFileHelper() {  }  public SDFileHelper(Context context) {    super();    this.context = context;  }  //往SD卡写入文件的方法  public void savaFileToSD(String filename, String filecontent) throws Exception {    //如果手机已插入sd卡,且app具有读写sd卡的权限    if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {      filename = Environment.getExternalStorageDirectory().getCanonicalPath() + "/" + filename;      //这里就不要用openFileOutput了,那个是往手机内存中写数据的      FileOutputStream output = new FileOutputStream(filename);      output.write(filecontent.getBytes());      //将String字符串以字节流的形式写入到输出流中      output.close();      //关闭输出流    } else Toast.makeText(context, "SD卡不存在或者不可读写", Toast.LENGTH_SHORT).show();  }  //读取SD卡中文件的方法  //定义读取文件的方法:  public String readFromSD(String filename) throws IOException {    StringBuilder sb = new StringBuilder("");    if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {      filename = Environment.getExternalStorageDirectory().getCanonicalPath() + "/" + filename;      //打开文件输入流      FileInputStream input = new FileInputStream(filename);      byte[] temp = new byte[1024];      int len = 0;      //读取文件内容:      while ((len = input.read(temp)) > 0) {        sb.append(new String(temp, 0, len));      }      //关闭输入流      input.close();    }    return sb.toString();  }}

public class MainActivity extends AppCompatActivity implements View.OnClickListener{  private EditText editname;  private EditText editdetail;  private Button btnsave;  private Button btnclean;  private Button btnread;  private Context mContext;  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    mContext = getApplicationContext();    bindViews();  }  private void bindViews() {    editname = (EditText) findViewById(R.id.edittitle);    editdetail = (EditText) findViewById(R.id.editdetail);    btnsave = (Button) findViewById(R.id.btnsave);    btnclean = (Button) findViewById(R.id.btnclean);    btnread = (Button) findViewById(R.id.btnread);    btnsave.setOnClickListener(this);    btnclean.setOnClickListener(this);    btnread.setOnClickListener(this);  }  @Override  public void onClick(View v) {    switch (v.getId()){      case R.id.btnclean:        editdetail.setText("");        editname.setText("");        break;      case R.id.btnsave:        String filename = editname.getText().toString();        String filedetail = editdetail.getText().toString();        SDFileHelper sdHelper = new SDFileHelper(mContext);        try        {          sdHelper.savaFileToSD(filename, filedetail);          Toast.makeText(getApplicationContext(), "数据写入成功", Toast.LENGTH_SHORT).show();        }        catch(Exception e){          e.printStackTrace();          Toast.makeText(getApplicationContext(), "数据写入失败", Toast.LENGTH_SHORT).show();        }        break;      case R.id.btnread:        String detail = "";        SDFileHelper sdHelper2 = new SDFileHelper(mContext);        try        {          String filename2 = editname.getText().toString();          detail = sdHelper2.readFromSD(filename2);        }        catch(IOException e){e.printStackTrace();}        Toast.makeText(getApplicationContext(), detail, Toast.LENGTH_SHORT).show();        break;    }  }}

<!-- 在SDCard中创建与删除文件权限 --><uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/><!-- 往SDCard写入数据权限 --><uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

android.os.Enviroment.isExternalStorageRemovalbe()

package com.turing.base.activity.dataStore.fileStore;import android.content.Context;import android.os.Environment;import android.os.StatFs;import android.os.storage.StorageManager;import android.text.TextUtils;import android.util.Log;import java.io.File;import java.lang.reflect.InvocationTargetException;import java.lang.reflect.Method;import java.util.concurrent.ConcurrentLinkedQueue;import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;/** * 用于适配不同型号手机，反射获取SD卡路径和状态 * */public class DevMountInfo {  private final String TAG = DevMountInfo.class.getSimpleName();  private static final int ERROR = -1;  // class name  private final static String CLASS_NAME = "android.os.storage.StorageVolume";  //remained spare memory size  private static final int REMAINED_SPARE_IN_MB = 100;  // method name  private final static String METHOD_GET_VOLUME_LIST = "getVolumeList";  private final static String METHOD_GET_VOLUME_STATE = "getVolumeState";  private final static String METHOD_IS_REMOVABLE = "isRemovable";  private final static String METHOD_GET_PATH = "getPath";  private final static String MOUNTED = "mounted";  private static DevMountInfo INSTANCE;  private String mSDCardPath = null;  // internal file path  private ConcurrentLinkedQueue<String> mInternalPathList = new ConcurrentLinkedQueue<String>();  // external file path  private ConcurrentLinkedQueue<String> mExternalPathList = new ConcurrentLinkedQueue<String>();  private ExecutorService mExecutor = null;  private DevMountInfo() {    mExecutor = Executors.newSingleThreadExecutor();  }  public static DevMountInfo getInstance() {    synchronized (DevMountInfo.class) {      if (null == INSTANCE) {        INSTANCE = new DevMountInfo();      }      return INSTANCE;    }  }  @Override  protected void finalize() throws Throwable {    super.finalize();    synchronized (DevMountInfo.class) {      mInternalPathList.clear();      mExternalPathList.clear();      mExecutor.shutdown();      INSTANCE = null;    }  }  public void init(final Context context) {    mExecutor.execute(new Runnable() {      @Override      public void run() {        executeInit(context);      }    });  }  public boolean isSDCardFull() {    return REMAINED_SPARE_IN_MB > (getSDCardAvailSpace() * 1024);  }  public boolean isSDCardAvaiable() {    return !mExternalPathList.isEmpty() || !mInternalPathList.isEmpty();  }  public String getSDCardPath() {    return mSDCardPath;  }  public long getSDCardTotalSpace() {    long totalSpace = 0;    if (!TextUtils.isEmpty(mSDCardPath)) {      StatFs sf = new StatFs(mSDCardPath);      long blockSize = sf.getBlockSize();      long total = sf.getBlockCount();      totalSpace = total * blockSize / 1024;    }    return totalSpace;  }  public long getSDCardAvailSpace() {    long availSpace = 0;    if (!TextUtils.isEmpty(mSDCardPath)) {      StatFs sf = new StatFs(mSDCardPath);      long blockSize = sf.getBlockSize();      long availCount = sf.getAvailableBlocks();      availSpace = availCount * blockSize / 1024;    }    return availSpace;  }  public String getInternalSDCardPath() {    return mInternalPathList.peek();  }  public String getExternalSDCardPath() {    return mExternalPathList.peek();  }  private void executeInit(Context context) {    StorageManager mStorageManager = (StorageManager) context.getSystemService(Context.STORAGE_SERVICE);    if (mStorageManager != null) {      Class<?> mStorageVolume = null;      Method mGetVolumeListMethod = null;      Method mGetVolumeStateMethod = null;      Method mGetPathMethod = null;      Method mIsRemovableMethod = null;      Object[] mStorageVolumeList = null;      try {        mStorageVolume = Class.forName(CLASS_NAME);        mGetVolumeListMethod = mStorageManager.getClass().getMethod(METHOD_GET_VOLUME_LIST, new Class[0]);        mGetVolumeStateMethod = mStorageManager.getClass().getMethod(METHOD_GET_VOLUME_STATE, new Class[]{String.class});        mIsRemovableMethod = mStorageVolume.getMethod(METHOD_IS_REMOVABLE, new Class[0]);        mGetPathMethod = mStorageVolume.getMethod(METHOD_GET_PATH, new Class[0]);        mStorageVolumeList = (Object[]) mGetVolumeListMethod.invoke(mStorageManager, new Object[0]);        boolean mIsRemovable = false;        if (mStorageVolumeList != null && mStorageVolumeList.length > 0) {          int mStorageVolumeCount = mStorageVolumeList.length;          Log.i(TAG, "init() === > StorageVolume Count = " + mStorageVolumeCount);          mInternalPathList.clear();          mExternalPathList.clear();          for (int i = 0; i < mStorageVolumeCount; ++i) {            String mStoragePath = (String) mGetPathMethod.invoke(mStorageVolumeList[i], new Object[0]);            mIsRemovable = ((Boolean) mIsRemovableMethod.invoke(mStorageVolumeList[i], new Object[0])).booleanValue();            if (!TextUtils.isEmpty(mStoragePath)) {              String state = (String) mGetVolumeStateMethod.invoke(mStorageManager, new Object[]{mStoragePath});              if ((state != null) && (state.equals(MOUNTED))) {                if (mIsRemovable) {                  Log.i(TAG, "init() === > external storage path = (" + mStoragePath + ")");                  mExternalPathList.add(mStoragePath);                } else {                  Log.i(TAG, "init() === > internal storage path = (" + mStoragePath + ")");                  mInternalPathList.add(mStoragePath);                }              }            }          }        }      } catch (ClassNotFoundException e) {        handleInvalid();        Log.e(TAG, "init() === > Exception:ClassNotFoundException");      } catch (NoSuchMethodException e) {        handleInvalid();        Log.e(TAG, "init() === > Exception:NoSuchMethodException");      } catch (IllegalArgumentException e) {        handleInvalid();        Log.e(TAG, "init() === > Exception:IllegalArgumentException");      } catch (IllegalAccessException e) {        handleInvalid();        Log.e(TAG, "init() === > Exception:IllegalAccessException");      } catch (InvocationTargetException e) {        handleInvalid();        Log.e(TAG, "init() === > Exception:InvocationTargetException");      }    } else {      handleInvalid();      Log.e(TAG, "init() === > can't get storage manager");    }    initSDCardPath();  }  private void handleInvalid() {    mInternalPathList.add(Environment.getExternalStorageDirectory().getPath());  }  private void initSDCardPath() {    if (!mExternalPathList.isEmpty()) {      mSDCardPath = mExternalPathList.peek();    } else if (!mInternalPathList.isEmpty()) {      mSDCardPath = mInternalPathList.peek();    } else {      mSDCardPath = Environment.getExternalStorageDirectory().getPath();    }    Log.i(TAG, "initSDCardPath() === > SDCARD PATH = (" + mSDCardPath + ")");  }  /**   * SDCARD是否存   */  public static boolean externalMemoryAvailable() {    return android.os.Environment.getExternalStorageState().equals(        android.os.Environment.MEDIA_MOUNTED);  }  /**   * 获取手机内部剩余存储空间   *   * @return   */  public static long getAvailableInternalMemorySize() {    File path = Environment.getDataDirectory();    StatFs stat = new StatFs(path.getPath());    long blockSize = stat.getBlockSize();    long availableBlocks = stat.getAvailableBlocks();    return availableBlocks * blockSize;  }  /**   * 获取手机内部总的存储空间   *   * @return   */  public static long getTotalInternalMemorySize() {    File path = Environment.getDataDirectory();    StatFs stat = new StatFs(path.getPath());    long blockSize = stat.getBlockSize();    long totalBlocks = stat.getBlockCount();    return totalBlocks * blockSize;  }  /**   * 获取手机内置存储剩余存储空间   *   * @return   */  public static long getAvailableInternalSystemMemorySize() {    File path = Environment.getRootDirectory();    StatFs stat = new StatFs(path.getPath());    long blockSize = stat.getBlockSize();    long availableBlocks = stat.getAvailableBlocks();    return availableBlocks * blockSize;  }  /**   * 获取手机内置存储总的存储空间   *   * @return   */  public static long getTotalInternalSystemMemorySize() {    File path = Environment.getRootDirectory();    StatFs stat = new StatFs(path.getPath());    long blockSize = stat.getBlockSize();    long totalBlocks = stat.getBlockCount();    return totalBlocks * blockSize;  }  /**   * 获取SDCARD剩余存储空间   *   * @return   */  public static long getAvailableExternalMemorySize() {    if (externalMemoryAvailable()) {      File path = Environment.getExternalStorageDirectory();      StatFs stat = new StatFs(path.getPath());      long blockSize = stat.getBlockSize();      long availableBlocks = stat.getAvailableBlocks();      return availableBlocks * blockSize;    } else {      return ERROR;    }  }  /**   * 获取SDCARD总的存储空间   *   * @return   */  public static long getTotalExternalMemorySize() {    if (externalMemoryAvailable()) {      File path = Environment.getExternalStorageDirectory();      StatFs stat = new StatFs(path.getPath());      long blockSize = stat.getBlockSize();      long totalBlocks = stat.getBlockCount();      return totalBlocks * blockSize;    } else {      return ERROR;    }  }  public static long getAvailableMemorySize(String path) {    if (null == path)      return 0;    StatFs stat = new StatFs(path);    long blockSize = stat.getBlockSize();    long availableBlocks = stat.getAvailableBlocks();    return availableBlocks * blockSize;  }}

InputStream is =getResources().openRawResource(R.raw.filename); 

AssetManager am = getAssets(); InputStream is = am.open("filename");

<?xml version="1.0" encoding="utf-8"?><products>  <product>    <id>10</id>    <name>电脑</name>    <price>2067.25</price>  </product>  <product>    <id>20</id>    <name>微波炉</name>    <price>520</price>  </product>  <product>    <id>30</id>    <name>洗衣机</name>    <price>2400</price>  </product></products>

public class Product{  private int id;  private String name;  private float price;  public int getId()  {    return id;  }  public void setId(int id)  {    this.id = id;  }  public String getName()  {    return name;  }  public void setName(String name)  {    this.name = name;  }  public float getPrice()  {    return price;  }  public void setPrice(float price)  {    this.price = price;  }}

import org.xml.sax.Attributes;import org.xml.sax.SAXException;import org.xml.sax.helpers.DefaultHandler;import java.util.ArrayList;import java.util.List;public class XML2Product extends DefaultHandler {  private List<Product> products;  private Product product;  private StringBuffer buffer = new StringBuffer();  public List<Product> getProducts() {    return products;  }  @Override  public void characters(char[] ch, int start, int length)      throws SAXException {    buffer.append(ch, start, length);    super.characters(ch, start, length);  }  @Override  public void startDocument() throws SAXException {    // 开始分析xml文件,创建List对象用于保存分析完的Product对象    products = new ArrayList<Product>();  }  @Override  public void startElement(String uri, String localName, String qName,               Attributes attributes) throws SAXException {    if (localName.equals("product")) {      // 如果分析的是<product>标签，则创建一个Product对象      product = new Product();    }    super.startElement(uri, localName, qName, attributes);  }  @Override  public void endElement(String uri, String localName, String qName)      throws SAXException {    if (localName.equals("product")) {      // 处理完 <product>标签后 将product对象添加到products中      products.add(product);    } else if (localName.equals("id")) {      // 设置id属性的值      product.setId(Integer.parseInt(buffer.toString().trim()));      // 将标签内容的缓存区清空      buffer.setLength(0);    } else if (localName.equals("name")) {      product.setName(buffer.toString().trim());      buffer.setLength(0);    } else if (localName.equals("price")) {      product.setPrice(Float.parseFloat(buffer.toString().trim()));      buffer.setLength(0);    }    super.endElement(uri, localName, qName);  }}

import android.app.AlertDialog;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.util.Xml;import android.view.View;import com.turing.base.R;import java.io.InputStream;import java.util.List;public class Xml2JavaObjectAct extends AppCompatActivity {  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_xml2_java_object);  }  public void onClick_XMLToObject(View view) {    try {      // 打开资源文件      InputStream is = getResources().openRawResource(R.raw.products);      XML2Product xml2Product = new XML2Product();      // 开始分析priducts.xml文件      android.util.Xml.parse(is, Xml.Encoding.UTF_8, xml2Product);      // 输出转换后的java对象      List<Product> products = xml2Product.getProducts();      String msg = "共" + products.size() + "个产品/n";      for (Product product : products) {        msg += "id:" + product.getId() + " 产品名：" + product.getName()            + " 价格：" + product.getPrice() + "/n";      }      // 弹出对话框      new AlertDialog.Builder(this).setTitle("产品信息").setMessage(msg)          .setPositiveButton("关闭", null).show();    } catch (Exception e) {    }  }}

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:layout_width="fill_parent"  android:layout_height="fill_parent"  android:orientation="vertical" >  <Button    android:layout_width="fill_parent"    android:layout_height="wrap_content"    android:onClick="onClick_Jar_Compress"    android:text="用jar格式压缩文件" />  <Button    android:layout_width="fill_parent"    android:layout_height="wrap_content"    android:onClick="onClick_Jar_Uncompress"    android:text="解压jar格式文件" />  <Button    android:layout_width="fill_parent"    android:layout_height="wrap_content"    android:onClick="onClick_Zip_Compress"    android:text="用zip格式压缩文件" />  <Button    android:layout_width="fill_parent"    android:layout_height="wrap_content"    android:onClick="onClick_Zip_Uncompress"    android:text="解压zip格式文件" /></LinearLayout>

import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.view.View;import android.widget.Toast;import com.turing.base.R;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.InputStream;import java.util.jar.JarEntry;import java.util.jar.JarInputStream;import java.util.jar.JarOutputStream;import java.util.zip.ZipEntry;import java.util.zip.ZipInputStream;import java.util.zip.ZipOutputStream;public class JarZipAct extends AppCompatActivity {  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_jar_zip);  }  public void onClick_Jar_Compress(View view) {    try {      // 使用FileOutputStream对象指定一个要输出的压缩文件(file.jar)      FileOutputStream fos = new FileOutputStream(          android.os.Environment.getExternalStorageDirectory()              + "/file.jar");      // 第一步 创建JarOutputStream对象      JarOutputStream jos = new JarOutputStream(fos);      // 第二步 创建一个JarEntry对象，并指定待压缩文件在压缩包中的文件名      JarEntry jarEntry = new JarEntry("strings.xml");      jos.putNextEntry(jarEntry);      InputStream is = getResources().getAssets().open("strings.xml");      byte[] buffer = new byte[8192];      int count = 0;      // 第四步 写入数据      while ((count = is.read(buffer)) >= 0) {        jos.write(buffer, 0, count);      }      // 第五步 关闭当前的JarEntry等对象      is.close();      jos.closeEntry();      jos.close();      Toast.makeText(this, "成功将strings.xml文件以jar格式压缩.", Toast.LENGTH_LONG)          .show();    } catch (Exception e) {      Toast.makeText(this, e.getMessage(), Toast.LENGTH_LONG).show();    }  }  public void onClick_Jar_Uncompress(View view) {    try {      // 定义要解压的文件      String filename = android.os.Environment          .getExternalStorageDirectory() + "/file.jar";      if (!new File(filename).exists()) {        Toast.makeText(this, "压缩文件不存在.", Toast.LENGTH_LONG).show();        return;      }      // 使用FileInputStream对象指定要解压的对象      FileInputStream fis = new FileInputStream(filename);      // 1 创建JarInputStream对象来读取压缩文件（file.jar）      JarInputStream jis = new JarInputStream(fis);      // 2 调用getNextJarEntry方法打开压缩包中的第一个文件 ，如果有多个，多次调用该方法      JarEntry jarEntry = jis.getNextJarEntry();      // 3 输出已解压的文件      FileOutputStream fos = new FileOutputStream(          android.os.Environment.getExternalStorageDirectory()              + "/" + jarEntry.getName());      byte[] buffer = new byte[8192];      int count = 0;      // 4 输出已解压的字节流      while ((count = jis.read(buffer)) >= 0) {        fos.write(buffer, 0, count);      }      // 5 关闭      jis.closeEntry();      jis.close();      fos.close();      Toast.makeText(this, "成功解压jar格式的文件.", Toast.LENGTH_LONG).show();    } catch (Exception e) {      Toast.makeText(this, e.getMessage(), Toast.LENGTH_LONG).show();    }  }  public void onClick_Zip_Compress(View view) {    try {      // 指定了2个待压缩的w文件，都在assets目录中      String[] filenames = new String[]          {"main.xml", "strings.xml"};      FileOutputStream fos = new FileOutputStream(          android.os.Environment.getExternalStorageDirectory()              + "/file.zip");      ZipOutputStream zos = new ZipOutputStream(fos);      int i = 1;      //枚举filenames中的所有待压缩文件      while (i <= filenames.length) {        // 从filenames数组中取出当前待压缩的温佳明，作为压缩后的文件名,以保持要说前后文件名称一致        ZipEntry zipEntry = new ZipEntry(filenames[i - 1]);        // 打开当前的ZipEntry对象        zos.putNextEntry(zipEntry);        InputStream is = getResources().getAssets().open(            filenames[i - 1]);        byte[] buffer = new byte[8192];        int count = 0;        // 写入数据        while ((count = is.read(buffer)) >= 0) {          zos.write(buffer, 0, count);        }        zos.flush();        // 关闭当前的ZipEntry对象        zos.closeEntry();        is.close();        i++;      }      zos.finish();      zos.close();      Toast.makeText(this, "成功将main.xml、strings.xml文件以zip格式压缩.",          Toast.LENGTH_LONG).show();    } catch (Exception e) {      Toast.makeText(this, e.getMessage(), Toast.LENGTH_LONG).show();    }  }  public void onClick_Zip_Uncompress(View view) {    try {      // 指定待解压的文件      String filename = android.os.Environment          .getExternalStorageDirectory() + "/file.zip";      if (!new File(filename).exists()) {        Toast.makeText(this, "压缩文件不存在.", Toast.LENGTH_LONG).show();        return;      }      FileInputStream fis = new FileInputStream(filename);      ZipInputStream zis = new ZipInputStream(fis);      ZipEntry zipEntry = null;      // 通过不断调用getNextEntry方法来解压file.zip中所有的文件      while ((zipEntry = zis.getNextEntry()) != null) {        FileOutputStream fos = new FileOutputStream(            android.os.Environment.getExternalStorageDirectory()                + "/" + zipEntry.getName());        byte[] buffer = new byte[8192];        int count = 0;        while ((count = zis.read(buffer)) >= 0) {          fos.write(buffer, 0, count);        }        zis.closeEntry();        fos.close();      }      zis.close();      Toast.makeText(this, "成功解压jar格式的文件.", Toast.LENGTH_LONG).show();    } catch (Exception e) {      Toast.makeText(this, e.getMessage(), Toast.LENGTH_LONG).show();    }  }}