android 從assets目錄解壓zip到本地sdCard

package com.lapel.activity.html;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.util.zip.ZipEntry;import java.util.zip.ZipInputStream;import android.content.Context;/** *  * 從assets目錄解壓zip到本地 * */public class UnzipFromAssets {/** * 解壓assets的zip壓縮檔到指定目錄 * @param context內容物件 * @param assetName壓縮檔名 * @param outputDirectory輸出目錄 * @param isReWrite是否覆蓋 * @throws IOException */public static void unZip(Context context, String assetName, String outputDirectory, boolean isReWrite) throws IOException {// 建立解壓目標目錄File file = new File(outputDirectory);// 如果目標目錄不存在，則建立if (!file.exists()) {file.mkdirs();}// 開啟壓縮檔InputStream inputStream = context.getAssets().open(assetName);ZipInputStream zipInputStream = new ZipInputStream(inputStream);// 讀取一個進入點ZipEntry zipEntry = zipInputStream.getNextEntry();// 使用1Mbufferbyte[] buffer = new byte[1024 * 1024];// 解壓時位元組計數int count = 0;// 如果進入點為空白說明已經遍曆完所有壓縮包中檔案和目錄while (zipEntry != null) {// 如果是一個目錄if (zipEntry.isDirectory()) {file = new File(outputDirectory + File.separator + zipEntry.getName());// 檔案需要覆蓋或者是檔案不存在if (isReWrite || !file.exists()) {file.mkdir();}} else {// 如果是檔案file = new File(outputDirectory + File.separator + zipEntry.getName());// 檔案需要覆蓋或者檔案不存在，則解壓檔案if (isReWrite || !file.exists()) {file.createNewFile();FileOutputStream fileOutputStream = new FileOutputStream(file);while ((count = zipInputStream.read(buffer)) > 0) {fileOutputStream.write(buffer, 0, count);}fileOutputStream.close();}}// 定位到下一個檔案入口zipEntry = zipInputStream.getNextEntry();}zipInputStream.close();}}