1.工具類 

/**
 * Created by YuShuangPing on 2018/12/15.
 */
public class ZipUtils {
    public static final String TAG = "ZIP";

    public ZipUtils() {

    }



    /**
     * 解壓assets目錄下的zip到指定的路徑
     * @param zipFileString ZIP的名稱，壓縮包的名稱：xxx.zip
     * @param outPathString 要解壓縮路徑
     * @throws Exception
     */
    public static void UnZipAssetsFolder(Context context, String zipFileString, String
                                                 outPathString) throws Exception {
        ZipInputStream inZip = new ZipInputStream(context.getAssets().open(zipFileString));
        ZipEntry zipEntry;
        String szName = "";
        while ((zipEntry = inZip.getNextEntry()) != null) {
            szName = zipEntry.getName();
            if (zipEntry.isDirectory()) {
                //獲取部件的資料夾名
                szName = szName.substring(0, szName.length() - 1);
                File folder = new File(outPathString + File.separator + szName);
                folder.mkdirs();
            } else {
                Log.e(TAG, outPathString + File.separator + szName);
                File file = new File(outPathString + File.separator + szName);
                if (!file.exists()) {
                    Log.e(TAG, "Create the file:" + outPathString + File.separator + szName);
                    file.getParentFile().mkdirs();
                    file.createNewFile();
                }
                // 獲取檔案的輸出流
                FileOutputStream out = new FileOutputStream(file);
                int len;
                byte[] buffer = new byte[1024];
                // 讀取（位元組）位元組到緩衝區
                while ((len = inZip.read(buffer)) != -1) {
                    // 從緩衝區（0）位置寫入（位元組）位元組
                    out.write(buffer, 0, len);
                    out.flush();
                }
                out.close();
            }
        }
        inZip.close();
    }
}
 

2.在Activity中呼叫：

try {
            //從assets目錄下解壓zip檔案
            ZipUtils.UnZipAssetsFolder(this,"download.zip", unZipPath);
            showHtml();
        } catch (Exception e) {
            e.printStackTrace();
        }