所有Android设备都有两个文件存储区域:内部存储空间(internal Storage)和外部存储空间(external Storage)。这些名称是在Android早期确定的,那时候大部分设备都提供内置的非易失性内存(内部存储空间)以及可移动存储媒介(如,Micro SD卡,提供外部存储空间)。现在,很多设备将永久性存储空间划分为单独的“内部”和“外部”分区。因此,即使没有可移动存储媒介,这两种存储空间也始终存在,并且无论外部存储空间是否可移动,这两种存储空间的API行为在Android系统上都是相同的。
可参考:Android内、外存储分区&常用存储目录详解(Android Q)_大渔歌_的博客-CSDN博客
以下为两个清除应用缓存的工具类
- /** * 本应用数据清除管理器 */
- public class DataCleanManager {
- private static final String TAG = "DataCleanManager";
- public static String getTotalCacheSize(Context context) throws Exception {
- long cacheSize = getFolderSize(context.getCacheDir());
- Log.v(TAG,"cacheSize=="+cacheSize);
- if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
- cacheSize += getFolderSize(context.getExternalCacheDir());
- Log.v(TAG,"cacheSize2=="+ getFolderSize(context.getExternalCacheDir()));
- }
- return getFormatSize(cacheSize);
- }
-
- //删除内外缓存
- 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();
- 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(long size) {
- Log.v(TAG,"size=="+size);
- double kiloByte = size/1024;
- if (kiloByte < 1) {
- return size/1024 + "kB";
- }
- double megaByte = kiloByte/1024;
- if (megaByte < 1) {
- BigDecimal result1 = new BigDecimal(Double.toString(kiloByte));
- return result1.setScale(1, BigDecimal.ROUND_HALF_UP)
- .toPlainString() + "KB";
- }
- double gigaByte = megaByte / 1024;
- if (gigaByte < 1) {
- BigDecimal result2 = new BigDecimal(Double.toString(megaByte));
- return result2.setScale(1, 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";
- }
-
- }
String resultCache = DataCleanManager.getTotalCacheSize(context);
DataCleanManager.clearAllCache(context);
- public class DateclearManager {
-
- /** * 清除本应用内部缓存(/data/data/com.xxx.xxx/cache) * * @param context */
- public static void cleanInternalCache(Context context) {
- deleteFilesByDirectory(context.getCacheDir());
- }
-
- /** * 清除本应用所有数据库(/data/data/com.xxx.xxx/databases) * * @param context */
- public static void cleanDatabases(Context context) {
- deleteFilesByDirectory(new File("/data/data/"
- + context.getPackageName() + "/databases"));
- }
-
- /**
- * * 清除本应用SharedPreference(/data/data/com.xxx.xxx/shared_prefs) * * @param
- * context
- */
- public static void cleanSharedPreference(Context context) {
- deleteFilesByDirectory(new File("/data/data/"
- + context.getPackageName() + "/shared_prefs"));
- }
-
- /** * 按名字清除本应用数据库 * * @param context * @param dbName */
- public static void cleanDatabaseByName(Context context, String dbName) {
- context.deleteDatabase(dbName);
- }
-
- /** * 清除/data/data/com.xxx.xxx/files下的内容 * * @param context */
- public static void cleanFiles(Context context) {
- deleteFilesByDirectory(context.getFilesDir());
- }
-
- /**
- * * 清除外部cache下的内容(/mnt/sdcard/android/data/com.xxx.xxx/cache) * * @param
- * context
- */
- public static void cleanExternalCache(Context context) {
- if (Environment.getExternalStorageState().equals(
- Environment.MEDIA_MOUNTED)) {
- deleteFilesByDirectory(context.getExternalCacheDir());
- }
- }
-
- /** * 清除自定义路径下的文件,使用需小心,请不要误删。而且只支持目录下的文件删除 * * @param filePath */
- public static void cleanCustomCache(String filePath) {
- deleteFilesByDirectory(new File(filePath));
- }
-
- /** * 清除本应用所有的数据 * * @param context * @param filepath */
- public static void cleanApplicationData(Context context, String... filepath) {
- cleanInternalCache(context);
- cleanExternalCache(context);
- cleanDatabases(context);
- cleanSharedPreference(context);
- cleanFiles(context);
- for (String filePath : filepath) {
- cleanCustomCache(filePath);
- }
- }
-
- /**
- *删除方法 这里只会删除某个文件夹下的文件,如果传入的directory是个文件,将不做处理
- * @param directory
- */
- private static void deleteFilesByDirectory(File directory) {
- if (directory != null && directory.exists() && directory.isDirectory()) {
- for (File item : directory.listFiles()) {
- item.delete();
- }
- }
- }
-
-
- /**
- * 获得所有缓存数据的大小
- * @param context
- * @return
- * @throws Exception
- */
- 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);
- }
-
- //清空缓存
- public static void clearAllCache(Context context) {
- deleteDir(context.getCacheDir());
- if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
- deleteDir(context.getExternalCacheDir());
- }
- }
-
- //删除文件
- 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();
- }
-
- // 获取文件大小
- //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;
- }
-
- /**
- * 格式化文件的单位 转化文件单位
- * @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";
- }
-
- }
-