一个应用安装完成,会有缓存,缓存一般分为内部存储的和外置的,内存中路径为/data/data/pacgage_name/文件,先来看看一般缓存会存在哪些文件中:
(1)缓存文件夹:
/data/data/com.xx/cache
(2)sharePreferance文件夹:
/data/data/com.xx/shared_prefs
(3)DB数据库文件夹:
/data/data/com.xx/databases
(4)files文件夹:(指向同一文件夹)
context.getFilesDir()
/data/data/com.xx/files
(5)外置缓存文件夹:context.getExternalCacheDir()
(6)lib文件夹,一般可以不清理该文件夹:
"/data/data/com.gtafe.zhpj/lib"
一般一个应用的缓存都存在这些文件夹中,接下直接上代码吧,把计算缓存和清除缓存都用一个类封装(带弹框):
- /**
- * Created by lan.zheng on 2016/9/1.
- */
- public class CacheUtil {
- private static final String CACHE_DATA_DB = "/data/data/com.gtafe.zhpj/databases";
- private static final String CACHE_DATA_SF = "/data/data/com.gtafe.zhpj/shared_prefs";
- private static final String CACHE_DATA_CACHE = "/data/data/com.gtafe.zhpj/cache";
- private static File lFileDB;
- private static File lFileSF;
- private static File lFileC;
- /**
- * 获取所有缓存
- * @param context
- * @return
- * @throws Exception
- */
- public static String getTotalCacheSize(Context context) throws Exception {
- lFileDB = new File(CACHE_DATA_DB);
- lFileSF = new File(CACHE_DATA_SF);
- lFileC = new File(CACHE_DATA_CACHE);
- //内存缓存DB和SF,cache,files文件
- long cacheSizeDB = getFolderSize(lFileDB);
- long cacheSizeSF = getFolderSize(lFileSF);
- long cacheSizeC = getFolderSize(lFileC);
- long cacheSize = cacheSizeDB + cacheSizeSF + cacheSizeC + getFolderSize(context.getFilesDir()); //context.getFilesDir()或者像上面一样直接用路径
- //fresco产生的cache,如果需要就加入下面这行代码
- //long cacheSizeFresco = Fresco.getImagePipelineFactory().getMainDiskStorageCache().getSize();
- cacheSize = cacheSize + cacheSizeFresco;
- if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
- cacheSize = cacheSize + getFolderSize(context.getExternalCacheDir());
- }
- return getFormatSize(cacheSize);
- }
- /**
- * 清除所有缓存
- * @param context
- * @return
- */
- static boolean isClearSuccess = true;
- public static void clearAllCache(Context context,ShowClearResultListener showClearResultListener) {
- mListener = showClearResultListener; //监听初始化
- showWaitingDialog(context); //弹框等待
- //清理Fresco的缓存
- ImagePipeline imagePipeline = Fresco.getImagePipeline();
- imagePipeline.clearCaches();
- //清理内存和文件缓存
- isClearSuccess = deleteDir(lFileDB);
- isClearSuccess = deleteDir(lFileSF);
- isClearSuccess = deleteDir(lFileC);
- isClearSuccess = deleteDir(context.getFilesDir());
- if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
- isClearSuccess = deleteDir(context.getExternalCacheDir());
- }
- //TODO 别的缓存
- /* if(context.getCacheDir() != null){
- deleteDir(context.getCacheDir());
- }*/
- }
- 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();
- }
- // 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++) {
- Log.d("test11","file"+i+" = "+fileList[i].toString());
- // 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 "0.0M";
- }
- 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";
- }
- /**
- * 弹框确认方法
- */
- public static void showWaitingDialog(Context context){
- //弹框
- popupConfirmDialog(context , "清除中...", R.mipmap.ic_clear_cache);
- }
- private static Dialog modifyDialog;
- static ShowClearResultListener mListener;
- private static void popupConfirmDialog(Context context, String content, int resId) {
- //弹框内容
- if (modifyDialog == null) {
- View contentView = LayoutInflater.from(context).inflate(R.layout.dialog_waiting_for_opr, null);
- TextView modifyContent = (TextView) contentView.findViewById(R.id.dialog_content_text);
- modifyContent.setText(content);
- ImageView modifyImage = (ImageView)contentView.findViewById(R.id.dialog_content_image);
- modifyImage.setImageDrawable(context.getResources().getDrawable(resId));
- modifyDialog = new Dialog(context, R.style.clearCacheDialogTheme); //使用自定义的样式
- modifyDialog.setCanceledOnTouchOutside(false); //外围点击不消失
- modifyDialog.setContentView(contentView);
- }
- modifyDialog.show();
- sleepToWaitClear();
- }
- static Handler mHandler = new Handler();
- private static void sleepToWaitClear(){
- mHandler.postDelayed(mRunnableDialogDismiss,1000); //延迟启动
- }
- private static Runnable mRunnableDialogDismiss = new Runnable() {
- @Override
- public void run() {
- if(modifyDialog != null ){
- modifyDialog.dismiss();
- modifyDialog = null;
- mListener.Clear(isClearSuccess);
- }
- }
- };
- /**
- * 1秒后回调清除结果
- */
- public interface ShowClearResultListener{
- void Clear(boolean isClear);
- }
- }
弹框的样式调用:
- <!-- 清除缓存弹框样式 -->
- <style name="clearCacheDialogTheme" parent="android:Theme.Dialog">
- <item name="android:windowFrame">@null</item>
- <item name="android:windowIsFloating">true</item>
- <item name="android:windowIsTranslucent">true</item>
- <item name="android:windowNoTitle">true</item><!--除去title-->
- <item name="android:backgroundDimEnabled">true</item>
- <item name="android:backgroundDimAmount">0.3</item><!-- 背景灰度 -->
- <item name="android:windowBackground">@color/transparent</item><!--除去背景色,透明-->
- <item name="android:radius">8dp</item>
- </style>
封装的弹框代码(圆角代码省略@drawable/dialog_content_radius):
- <?xml version="1.0" encoding="utf-8"?>
- <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:background="@drawable/dialog_content_radius"
- android:paddingTop="@dimen/hdp_20.0"
- android:paddingBottom="@dimen/hdp_20.0"
- android:paddingLeft="@dimen/wdp_20.0"
- android:paddingRight="@dimen/wdp_20.0"
- android:orientation="vertical"
- android:gravity="center"
- android:layout_gravity="center">
- <ImageView
- android:paddingBottom="@dimen/hdp_20.0"
- android:paddingLeft="@dimen/wdp_80.0"
- android:paddingRight="@dimen/wdp_80.0"
- android:id="@+id/dialog_content_image"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:src="@mipmap/ic_clear_cache"/>
- <TextView
- android:id="@+id/dialog_content_text"
- android:layout_width="match_parent"
- android:layout_height="wrap_content"
- android:ellipsize="end"
- android:maxLines="5"
- android:text="含笑半步癫"
- android:textSize="@dimen/sp_16.0"
- android:textColor="@color/text_666666"
- android:gravity="center"/>
- </LinearLayout>
(1)获取缓存大小:
- String cacheSize=CacheUtil.getTotalCacheSize(this);
- cache_size.setText(cacheSize);
(2)清除缓存:
- CacheUtil.clearAllCache(UserCenterActivity.this, new CacheUtil.ShowClearResultListener() {
- @Override
- public void Clear(boolean isClear) {
- if(isClear){
- cache_size.setText("0.0M");
- }
- }
- });