Android Empty Cache

App development often has the ability to calculate cache size and empty the cache, a feature that is common enough to be seen by almost every application, with code to implement this feature:
The steps are:
1. Get the cache path
Obtain long-time saved files, Context.getexternalfilesdir ();
Storage location, sdcard/android/data/the package name of your app/files/
Get temporary cache, Context.getexternalcachedir ();
Storage location, sdcard/android/data/your app package name/cache/
2. Delete Cache

Package Com.smartcontrol.utils;import java.io.file;import java.math.bigdecimal;import android.content.Context; Import android.os.Environment;/** * Clear Cache **/ Public classCleanmessageutil {/** * @param context * @return * @throws Exception * Get current cache*/     Public StaticString gettotalcachesize (context context) throws Exception {LongCacheSize =getfoldersize (Context.getcachedir ()); if(Environment.getexternalstoragestate (). Equals (environment.media_mounted)) {cacheSize +=getfoldersize (Context.getexternalcachedir ()); }        returngetformatsize (cacheSize); }    /** * @param context * Delete Cache*/     Public Static voidClearallcache (Context context) {Deletedir (Context.getcachedir ()); if(Environment.getexternalstoragestate (). Equals (environment.media_mounted)) {Deletedir (cont        Ext.getexternalcachedir ()); }    }    Private Staticboolean Deletedir (File dir) {if(dir! =NULL&&dir.isdirectory ()) {string[] Children=dir.list (); intSize =0; if(Children! =NULL) {size=children.length;  for(inti =0; i < size; i++) {Boolean success= Deletedir (NewFile (dir, children[i])); if(!success) {                        return false; }                }            }        }        if(dir = =NULL) {            return true; } Else {            returnDir.delete (); }    }    //Get File//Context.getexternalfilesdir ()-sdcard/android/data/your app's package name/files///Table of contents, usually put some long time to save the data//Context.getexternalcachedir ()--//sdcard/android/data/your App package name/cache/directory, typically storing temporary cache data     Public Static Longgetfoldersize (File file) throws Exception {LongSize =0; Try{file[] fileList=File.listfiles (); intSize2 =0; if(FileList! =NULL) {Size2=filelist.length;  for(inti =0; i < size2; i++) {                    //If there is a file below                    if(Filelist[i].isdirectory ()) {size= size +getfoldersize (Filelist[i]); } Else{size= size +filelist[i].length (); }                }            }        } Catch(Exception e) {e.printstacktrace (); }        returnsize; }    /** Formatted unit * Calculates the size of the cache * @param a size * @return*/     Public StaticString Getformatsize (Doublesize) {        Doublekilobyte = size/1024x768; if(Kilobyte <1) {            //return size + "Byte";            return "0K"; }        Doublemegabyte = kilobyte/1024x768; if(Megabyte <1) {BigDecimal result1=NewBigDecimal (double.tostring (kilobyte)); returnResult1.setscale (2, bigdecimal.round_half_up). toplainstring ()+"KB"; }        DoubleGigaByte = megabyte/1024x768; if(GigaByte <1) {BigDecimal result2=NewBigDecimal (double.tostring (megabyte)); returnResult2.setscale (2, bigdecimal.round_half_up). toplainstring ()+"MB"; }        Doubleterabytes = gigaByte/1024x768; if(Terabytes <1) {BigDecimal RESULT3=NewBigDecimal (double.tostring (gigaByte)); returnResult3.setscale (2, bigdecimal.round_half_up). toplainstring ()+"GB"; } BigDecimal RESULT4=NewBigDecimal (terabytes); returnResult4.setscale (2, bigdecimal.round_half_up). toplainstring ()+"TB"; }}

The above code is a well-encapsulated class, click Invoke:

Cleanmessageutil.clearallcache (Getapplicationcontext ());

Android Empty Cache