清理缓存

来源：互联网发布：局域网域名解析软件编辑：程序博客网时间：2024/04/29 16:32

import java.io.File;
import java.math.BigDecimal;

import android.content.Context;
import android.os.Environment;

public class DataCleanManager {
   public static String getTotalCacheSize(Context context) throws Exception {
       long cacheSize = getFolderSize(context.getCacheDir());
       if (Environment.getExternalStorageState().equals(
               Environment.MEDIA_MOUNTED)) {
           cacheSize += getFolderSize(Environment.getExternalStorageDirectory());
       }
       return getFormatSize(cacheSize);
   }

   public static boolean clearAllCache(Context context) {
       deleteDir(context.getCacheDir());
       boolean delete = false;
       if (Environment.getExternalStorageState().equals(
               Environment.MEDIA_MOUNTED)) {
           delete = deleteDir(Environment.getExternalStorageDirectory());
       }
       return delete;
   }

   private static boolean deleteDir(File dir) {
       if (dir != null && dir.isDirectory()) {
           String[] children = dir.list();
           for (int i = 0; i < children.length; i++) {
               boolean success = deleteDir(new File(dir, children[i]));
               if (!success) {
                   return false;
               }
           }
       }
       return dir.delete();
   }

   // 获取文件
   // Context.getExternalFilesDir() --> SDCard/Android/data/你的应用的包名/files/
   // 目录，一般放一些长时间保存的数据
   // Context.getExternalCacheDir() -->
   // SDCard/Android/data/你的应用包名/cache/目录，一般存放临时缓存数据
   public static long getFolderSize(File file) throws Exception {
       long size = 0;
       try {
           File[] fileList = file.listFiles();
           for (int i = 0; i < fileList.length; i++) {
               // 如果下面还有文件
               if (fileList[i].isDirectory()) {
                   size = size + getFolderSize(fileList[i]);
               } else {
                   size = size + fileList[i].length();
               }
           }
       } catch (Exception e) {
           e.printStackTrace();
       }
       return size;
   }

   /**
   * 格式化单位
   *
   * @param size
   * @return
   */
   public static String getFormatSize(double size) {
       double kiloByte = size / 1024;
       if (kiloByte < 1) {
           // return size + "Byte";
           return kiloByte+"K";
       }

       double megaByte = kiloByte / 1024;
       if (megaByte < 1) {
           BigDecimal result1 = new BigDecimal(Double.toString(kiloByte));
           return result1.setScale(2, BigDecimal.ROUND_HALF_UP)
                   .toPlainString() + "KB";
       }

       double gigaByte = megaByte / 1024;
       if (gigaByte < 1) {
           BigDecimal result2 = new BigDecimal(Double.toString(megaByte));
           return result2.setScale(2, BigDecimal.ROUND_HALF_UP)
                   .toPlainString() + "MB";
       }

       double teraBytes = gigaByte / 1024;
       if (teraBytes < 1) {
           BigDecimal result3 = new BigDecimal(Double.toString(gigaByte));
           return result3.setScale(2, BigDecimal.ROUND_HALF_UP)
                   .toPlainString() + "GB";
       }
       BigDecimal result4 = new BigDecimal(teraBytes);
       return result4.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString()
               + "TB";
   }

}

当你在项目中需要查下缓存大小，就使用getTotalCacheSize(Context)方法，清空缓存，就使用clearAllCache(Context)方法

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