package com.nngame.hnmj.utils; import android.content.Context; import android.os.Environment; import java.io.File; import java.math.BigDecimal; /** * Created by Administrator on 2017/3/6. * 清除緩存 */ public class CleanMessageUtil { /** * @param context * @return * @throws Exception * 獲取當前緩存 */ public static String getTotalCacheSize(Context context) throws Exception { long cacheSize = getFolderSize(context.getCacheDir()); if (Environment.getExternalStorageState().equals( Environment.MEDIA_MOUNTED)) { cacheSize += getFolderSize(context.getExternalCacheDir()); } return getFormatSize(cacheSize); } /** * @param context * 刪除緩存 */ public static void clearAllCache(Context context) { deleteDir(context.getCacheDir()); if (Environment.getExternalStorageState().equals( Environment.MEDIA_MOUNTED)) { deleteDir(context.getExternalCacheDir()); } } private static boolean deleteDir(File dir) { if (dir != null && dir.isDirectory()) { String[] children = dir.list(); int size = 0; if (children != null) { size = children.length; for (int i = 0; i < size; i++) { boolean success = deleteDir(new File(dir, children[i])); if (!success) { return false; } } } } if (dir == null) { return true; } else { return dir.delete(); } } // 獲取文件 // Context.getExternalFilesDir() --> SDCard/Android/data/你的應用的包名/files/ // 目錄,一般放一些長時間保存的數據 // Context.getExternalCacheDir() --> // SDCard/Android/data/你的應用包名/cache/目錄,一般存放臨時緩存數據 public static long getFolderSize(File file) throws Exception { long size = 0; try { File[] fileList = file.listFiles(); int size2 = 0; if (fileList != null) { size2 = fileList.length; for (int i = 0; i < size2; i++) { // 如果下面還有文件 if (fileList[i].isDirectory()) { size = size + getFolderSize(fileList[i]); } else { size = size + fileList[i].length(); } } } } catch (Exception e) { e.printStackTrace(); } return size; } /** * 格式化單位 * 計算緩存的大小 * @param size * @return */ public static String getFormatSize(double size) { double kiloByte = size / 1024; if (kiloByte < 1) { // return size + "Byte"; return "0K"; } 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"; }
}
//計算出緩存的大小 String size=CleanMessageUtil.getTotalCacheSize(SettingActivity.this); tvDirsize.setText(size);
//清理緩存 CleanMessageUtil.clearAllCache(SettingActivity.this);