Android清除外部和内部缓存，数据库，SharedPreference，指定路径下的文件，获取缓存大小，格式化储存单位工具类

/**
* Created by Lam on 2017/7/22.
*/

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

/**
* 清除应用缓存
*/

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";
}
}