demo 1:
cleanInternalCache : 清除内部缓存
cleanInternalFiles : 清除内部文件
cleanInternalDbs : 清除内部数据库
cleanInternalDbByName : 根据名称清除数据库
cleanInternalSP : 清除内部SP
cleanExternalCache : 清除外部缓存
cleanCustomCache : 清除自定义目录下的文件
public class CleanUtils {
private CleanUtils() {
throw new UnsupportedOperationException("u can't instantiate me...");
}
/**
* 清除内部缓存
* <p>/data/data/com.xxx.xxx/cache</p>
*
* @param context 上下文
* @return {@code true}: 清除成功<br>{@code false}: 清除失败
*/
public static boolean cleanInternalCache(Context context) {
return FileUtils.deleteFilesInDir(context.getCacheDir());
}
/**
* 清除内部文件
* <p>/data/data/com.xxx.xxx/files</p>
*
* @param context 上下文
* @return {@code true}: 清除成功<br>{@code false}: 清除失败
*/
public static boolean cleanInternalFiles(Context context) {
return FileUtils.deleteFilesInDir(context.getFilesDir());
}
/**
* 清除内部数据库
* <p>/data/data/com.xxx.xxx/databases</p>
*
* @param context 上下文
* @return {@code true}: 清除成功<br>{@code false}: 清除失败
*/
public static boolean cleanInternalDbs(Context context) {
return FileUtils.deleteFilesInDir(context.getFilesDir().getParent() + File.separator + "databases");
}
/**
* 根据名称清除数据库
* <p>/data/data/com.xxx.xxx/databases/dbName</p>
*
* @param context 上下文
* @param dbName 数据库名称
* @return {@code true}: 清除成功<br>{@code false}: 清除失败
*/
public static boolean cleanInternalDbByName(Context context, String dbName) {
return context.deleteDatabase(dbName);
}
/**
* 清除内部SP
* <p>/data/data/com.xxx.xxx/shared_prefs</p>
*
* @param context 上下文
* @return {@code true}: 清除成功<br>{@code false}: 清除失败
*/
public static boolean cleanInternalSP(Context context) {
return FileUtils.deleteFilesInDir(context.getFilesDir().getParent() + File.separator + "shared_prefs");
}
/**
* 清除外部缓存
* <p>/storage/emulated/0/android/data/com.xxx.xxx/cache</p>
*
* @param context 上下文
* @return {@code true}: 清除成功<br>{@code false}: 清除失败
*/
public static boolean cleanExternalCache(Context context) {
return SDCardUtils.isSDCardEnable() && FileUtils.deleteFilesInDir(context.getExternalCacheDir());
}
/**
* 清除自定义目录下的文件
*
* @param dirPath 目录路径
* @return {@code true}: 清除成功<br>{@code false}: 清除失败
*/
public static boolean cleanCustomCache(String dirPath) {
return FileUtils.deleteFilesInDir(dirPath);
}
/**
* 清除自定义目录下的文件
*
* @param dir 目录
* @return {@code true}: 清除成功<br>{@code false}: 清除失败
*/
public static boolean cleanCustomCache(File dir) {
return FileUtils.deleteFilesInDir(dir);
}
}
demo2:
//获取缓存
private void initCacheSize() {
/*
* 获取SD卡根目录:Environment.getExternalStorageDirectory().getAbsolutePath();
外部Cache路径:/mnt/sdcard/android/data/com.xxx.xxx/cache 一般存储缓存数据(注:通过getExternalCacheDir()获取)
外部File路径:/mnt/sdcard/android/data/com.xxx.xxx/files 存储长时间存在的数据
(注:通过getExternalFilesDir(String type)获取, type为特定类型,可以是以下任何一种
Environment.DIRECTORY_MUSIC,
Environment.DIRECTORY_PODCASTS,
Environment.DIRECTORY_RINGTONES,
Environment.DIRECTORY_ALARMS,
Environment.DIRECTORY_NOTIFICATIONS,
Environment.DIRECTORY_PICTURES,
Environment.DIRECTORY_MOVIES. )
* */
sdPath = Environment.getExternalStorageDirectory().getAbsolutePath();
outCachePath = activity.getExternalCacheDir();
outFilePath = activity.getExternalFilesDir(Environment.DIRECTORY_ALARMS);
try {
String outCacheSize = DataClearManager.getCacheSize(outCachePath);
String outFileSize = DataClearManager.getCacheSize(outFilePath);
float totalCacheSize = Float.parseFloat(outCacheSize) + Float.parseFloat(outFileSize);
tvMemorySize.setText(totalCacheSize + "");
} catch (Exception e) {
e.printStackTrace();
}
}
//清理缓存
new Thread(new Runnable() {
@Override
public void run() {
DataClearManager.cleanApplicationData(activity);
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}).start();
ToastUtils.showToastNew("缓存已被清除!");
tvMemorySize.setText("0KB");
/**
* 主要功能有清除内/外缓存,清除数据库,清除sharedPreference,清除files和清除自定义目录
*/
public class DataClearManager {
/**
* * 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);
if (filepath == null) {
return;
}
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;
}
/**
* 删除指定目录下文件及目录
*
* @param filePath
* @param deleteThisPath
*/
public static void deleteFolderFile(String filePath, boolean deleteThisPath) {
if (!TextUtils.isEmpty(filePath)) {
try {
File file = new File(filePath);
if (file.isDirectory()) {// 如果下面还有文件
File files[] = file.listFiles();
for (int i = 0; i < files.length; i++) {
deleteFolderFile(files[i].getAbsolutePath(), true);
}
}
if (deleteThisPath) {
if (!file.isDirectory()) {// 如果是文件,删除
file.delete();
} else {// 目录
if (file.listFiles().length == 0) {// 目录下没有文件或者目录,删除
file.delete();
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
/**
* 格式化单位
*
* @param size
* @return
*/
public static String getFormatSize(double size) {
double kiloByte = size / 1024;
if (kiloByte < 1) {
return size + "b";
}
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";
}
public static String getCacheSize(File file) throws Exception {
return getFormatSize(getFolderSize(file));
}
}