1.清除手机应用缓存、外部缓存、数据库、File、sharedPreference和自定义文件夹下的目录(转自http://www.cnblogs.com/rayray/p/3413673.html)

public class DataCleanUtil {

/**

* 清除所有缓存(内部和外部缓存)

*

* @param context

*/

public static void cleanAllCache(Context context) {

cleanInternalCache(context);

cleanExternalCache(context);

}

/**

* * 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());

}

}

/**

* * 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 boolean deleteFilesByDirectory(File dir) {

if (dir != null && dir.isDirectory()) {

String[] children = dir.list();

for (int i = 0; i < children.length; i++) {

boolean success = deleteFilesByDirectory(new File(dir,

children[i]));

if (!success) {

return false;

}

}

}

return dir.delete();

}

/**

* 缓存总大小(包括内部和外部缓存)

*

* @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);

}

/**

* 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,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(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";

}

/** * 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));

}

}