android 自动清空缓存
2017-12-17 21:33:22 halaoda 阅读数 125
public class ClearCatchApp {
    /**
     * @param context
     * @param catchPathString 缓存路径
     * @return
     * @throws Exception
     * 当前缓存大小
     */
    public static String getTotalCacheSize(Context context, String catchPathString) throws Exception {
        long cacheSize = getFolderSize(new File(catchPathString));
        if (Environment.getExternalStorageState().equals(
                Environment.MEDIA_MOUNTED)) {
            cacheSize += getFolderSize(context.getExternalCacheDir());
        }
        return getFormatSize(cacheSize);
    }

    /**
     * @param context
     * @param catchPathString 缓存路径
     *  清空缓存
     */
    public static void clearAllCache(Context context, String catchPathString) {
        deleteDir(new File(catchPathString));
        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();
        }
    }

    // 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
    private 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
     * 计算缓存的大小
     * @param size
     * @return
     */
    private 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";
    }
}
2017-12-14 19:45:20 lmq121210 阅读数 140
public class ClearCatchApp {
    /**
     * @param context
     * @param catchPathString 缓存路径
     * @return
     * @throws Exception
     * 当前缓存大小
     */
    public static String getTotalCacheSize(Context context, String catchPathString) throws Exception {
        long cacheSize = getFolderSize(new File(catchPathString));
        if (Environment.getExternalStorageState().equals(
                Environment.MEDIA_MOUNTED)) {
            cacheSize += getFolderSize(context.getExternalCacheDir());
        }
        return getFormatSize(cacheSize);
    }

    /**
     * @param context
     * @param catchPathString 缓存路径
     *  清空缓存
     */
    public static void clearAllCache(Context context, String catchPathString) {
        deleteDir(new File(catchPathString));
        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();
        }
    }

    // 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
    private 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
     * 计算缓存的大小
     * @param size
     * @return
     */
    private 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";
    }
}
2017-10-23 20:40:00 weixin_33724046 阅读数 33

APP开发中常有计算缓存大小和清空缓存的功能,此功能很常见,几乎每个应用都能看到,下面就用代码来实现此功能: 
步骤为: 
1、获取缓存路径 
获取长时间保存的文件,Context.getExternalFilesDir(); 
存储位置,SDCard/Android/data/你的应用的包名/files/ 
获取临时缓存, Context.getExternalCacheDir(); 
存储位置,SDCard/Android/data/你的应用包名/cache/ 
2、删除缓存

package com.smartcontrol.utils;

import java.io.File;
import java.math.BigDecimal;
import android.content.Context;
import android.os.Environment;

/**
 * 清除缓存
 *
 */
public class CleanMessageUtil {

    /**
     * @param context
     * @return
     * @throws Exception
     *             获取当前缓存
     */
    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
     *            删除缓存
     */
    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();
        }
    }

    // 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();
            int size2 = 0;
            if (fileList != null) {
                size2 = fileList.length;
                for (int i = 0; i < size2; 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
     * 计算缓存的大小
     * @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";
    }
}

上面代码是封装好的的类,点击调用时:

CleanMessageUtil.clearAllCache(getApplicationContext());

 

2017-10-23 20:40:00 weixin_30345055 阅读数 1

APP开发中常有计算缓存大小和清空缓存的功能,此功能很常见,几乎每个应用都能看到,下面就用代码来实现此功能: 
步骤为: 
1、获取缓存路径 
获取长时间保存的文件,Context.getExternalFilesDir(); 
存储位置,SDCard/Android/data/你的应用的包名/files/ 
获取临时缓存, Context.getExternalCacheDir(); 
存储位置,SDCard/Android/data/你的应用包名/cache/ 
2、删除缓存

package com.smartcontrol.utils;

import java.io.File;
import java.math.BigDecimal;
import android.content.Context;
import android.os.Environment;

/**
 * 清除缓存
 *
 */
public class CleanMessageUtil {

    /**
     * @param context
     * @return
     * @throws Exception
     *             获取当前缓存
     */
    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
     *            删除缓存
     */
    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();
        }
    }

    // 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();
            int size2 = 0;
            if (fileList != null) {
                size2 = fileList.length;
                for (int i = 0; i < size2; 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
     * 计算缓存的大小
     * @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";
    }
}

上面代码是封装好的的类,点击调用时:

CleanMessageUtil.clearAllCache(getApplicationContext());

 

转载于:https://www.cnblogs.com/zhujiabin/p/7718820.html

2018-01-16 19:56:38 E_D_I_E 阅读数 122
/**
    * @param context
    *            删除缓存
    */
   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();
       }
   }



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