有时候项目中需要清理一些缓存数据(如:图片缓存、网络数据缓存等),当然也要对SharedPreferences存储的数据进行清理,当然App中有个这样的功能可能会提高逼格吧。
public class CacheDataManager {
/**
* 获取整体缓存大小
* @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);
}
/**
* 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
* @param file
* @return
* @throws Exception
*/
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
*/
public static String getFormatSize(long size) {
long kb = size / 1024;
int m = (int) (kb / 1024);
int kbs = (int) (kb % 1024);
return m + "." + kbs + "M";
// 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";
}
/**
* 清空方法
* @param context
*/
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();
}
}
直接调用:
CacheDataManager.clearAllCache(SettingActivity.this);
其实它的清理速度是非常快的,那么做一个延时效果会让用户有一点点体验的:
@OnClick(R.id.setting_cleancache)
void clean() {
//设置默认的等待效果
mDlg = new WaitingDlg(SettingActivity.this, "", "", true);
PromptDialog dialog = new PromptDialog(SettingActivity.this, R.string.prompt, R.string.cleancache_title);
dialog.showYesNo(new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
SPUtils.clear();
mDlg.start();
new Thread(new clearCache()).start();
dialog.dismiss();
}
});
}
private Handler handler = new Handler() {
public void handleMessage(android.os.Message msg) {
switch (msg.what) {
case 0:
mDlg.dismiss();
Toast.makeText(SettingActivity.this, "清理完成", Toast.LENGTH_SHORT).show();
try {
cachetext.setText(CacheDataManager.getTotalCacheSize(SettingActivity.this));
} catch (Exception e) {
e.printStackTrace();
}
}
}
};
class clearCache implements Runnable {
@Override
public void run() {
try {
CacheDataManager.clearAllCache(SettingActivity.this);
Thread.sleep(1000);
if (CacheDataManager.getTotalCacheSize(SettingActivity.this).startsWith("0")) {
handler.sendEmptyMessage(0);
}
} catch (Exception e) {
return;
}
}
}