這個公共類至少可以用,但是會出現一個緩存過少報錯閃退的問題(沒有明確具體小於多少,一般是判斷在低於200KB的時候不執行清理),使用的時候需要添加判斷,總的來說可以用,但是不是特別的好用。
以下爲代碼:
package com.ladongjiguang.meikuangwuziyunshu.PublicClass;
import android.content.Context;
import android.os.Environment;
import java.io.File;
import java.math.BigDecimal;
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(context.getExternalCacheDir());
}
return getFormatSize(cacheSize);
}
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();
for (int i = 0; i < children.length; i++) {
boolean success = deleteDir(new File(dir, children[i]));
if (!success) {
return false;
}
}
}
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();
for (int i = 0; i < fileList.length; 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
*
* @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";
}
}
用法:
獲得緩存大小
try { <pre name="code" class="html"> String string = DataCleanManager.getTotalCacheSize(this);
} catch (Exception e) {
e.printStackTrace();}
清理緩存
DataCleanManager.clearAllCache(this);