Android应用数据、缓存的清除和获取缓存大小

import android.content.Context; import android.os.Environment; import java.io.File; import java.math.BigDecimal; public class ClearData {private Context context; public ClearData(Context context){ this.context = context; }/** * 清除应用所有的数据 */ public void clearAllDataOfApplication( String... customfilepath) { clearInternalCache(); clearExternalCache(); clearDatabases(); clearSharedPreference(); clearFiles(); if (customfilepath == null) { return; } for (String filePath : customfilepath) { clearCustomCache(filePath); } } /* *清除外部和内部缓存 */ public void clearAllCache() { clearExternalCache(); clearInternalCache(); }/** * 清除内部缓存(/data/data/包名/cache) */ public void clearInternalCache() { deleteFilesByDirectory(context.getCacheDir()); }/** * 清除应用SharedPreference(/data/data/包名/shared_prefs) */ public void clearSharedPreference() { deleteFilesByDirectory(new File("/data/data/" + context.getPackageName() + "/shared_prefs")); }/** * *清除所有数据库(/data/data/包名/databases) */ public void clearDatabases() { deleteFilesByDirectory(new File("/data/data/" + context.getPackageName() + "/databases")); }/** * 按名字清除数据库 */ public void clearDatabaseBydbName(String dbName) { context.deleteDatabase(dbName); }/** * 清除/data/data/包名/files下的内容 */ public void clearFiles() { deleteFilesByDirectory(context.getFilesDir()); }/** * 清除自定义路径下的文件(只支持目录下的文件删除,不支持目录) */ public void clearCustomCache(String filePath) { deleteFilesByDirectory(new File(filePath)); }/** * 清除外部SDcard下的cache内容(/mnt/sdcard/android/data/包名/cache) */ public void clearExternalCache() { if (Environment.getExternalStorageState().equals( Environment.MEDIA_MOUNTED)) { deleteFilesByDirectory(context.getExternalCacheDir()); } }/** * 只删除文件夹下的文件 * */ private static void deleteFilesByDirectory(File directory) { if (directory != null && directory.exists() && directory.isDirectory()) { for (File item : directory.listFiles()) { item.delete(); } } }/* **获取文件 **Context.getExternalFilesDir() --> SDCard/Android/data/包名/files/ 目录,一般放一些长时间保存的数据 **Context.getExternalCacheDir() --> SDCard/Android/data/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; }/** * 获取应用文件缓存大小 */ public String getCacheSize(File file) throws Exception { return getFormatSize(getFolderSize(file)); }/** * 获取外部和内部缓存大小 */ public String getTotalCacheSize() throws Exception { long cacheSize = getFolderSize(context.getCacheDir()); if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) { cacheSize += getFolderSize(context.getExternalCacheDir()); } return getFormatSize(cacheSize); }/** * 格式化缓存单位 */ public String getFormatSize(double size) { double kiloByte = size / 1024; if (kiloByte < 1) { return size + "Byte"; }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"; } }


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