Android Clear Cache Feature

The Application Data Cleanup Manager

Datacleanmanager.java was picked from the internet, forgot his name.

Load a webview generate cache well-known webview is one of the main reasons for generating cache

WebView After loading click the button query cache and then clear the cache then query the cache to see that the cache is actually cleared

or WebView. Click button to query the cache after loading and then go to set the application to see if the program's cache is the same answer must be the same

Here is the code

Datacleanmanager.java

Package com.yqy.yqy_cache;/* * File name: Datacleanmanager.java * Description: The main function is to clear the internal/external cache. Clear the database, clear sharedpreference, clear files and clear your own definition folder */import Java.io.file;import java.math.bigdecimal;import Android.content.context;import android.os.environment;/** * This app data Purge manager */public class Datacleanmanager {public static         String gettotalcachesize (Context context) throws Exception {Long cacheSize = Getfoldersize (Context.getcachedir ()); if (Environment.getexternalstoragestate (). Equals (environment.media_mounted)) {cacheSize + = GetFolder        Size (Context.getexternalcachedir ());    } return Getformatsize (cacheSize); }//get File//context.getexternalfilesdir ()-sdcard/android/data/your app's package name/files/folder, generally put some long-time saved data//context.g Etexternalcachedir ()-sdcard/android/data/your app package name/cache/folder, general storage temporarily cache data public static long Getfoldersize (File fil          E) throws Exception {long size = 0;      try {file[] fileList = File.listfiles ();        for (int i = 0; i < filelist.length; i++) {//Assume the following file if (Filelist[i].isdir                  Ectory ()) {size = size + getfoldersize (filelist[i]);                  } else {size = size + filelist[i].length ();          }}} catch (Exception e) {e.printstacktrace ();      } return size;        } public static void Clearallcache (context context) {Deletedir (Context.getcachedir ()); if (Environment.getexternalstoragestate (). Equals (environment.media_mounted)) {Deletedir (Context.getexternalc        Achedir ());    }} private static Boolean Deletedir (File dir) {if (dir = = null) {return false;            } 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 (); }/** * Formatted unit * * @param size * @return */public static String Getformatsize (Doub          Le size) {double kilobyte = size/1024;              if (kilobyte < 1) {//Return size + "Byte";        return "0K";          } 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"; /** * Clear this app internal cache (/data/data/com.xxx.xxx/cache) * * @param context */public static void Cleaninternalcache (context context ) {Deletefilesbydirectory (Context.getcachedir ());} /** * Clear this app all database (/data/data/com.xxx.xxx/databases) * * @param context */public static void cleandatabases (context context {Deletefilesbydirectory (New File ("/data/data/" + context.getpackagename () + "/databases"));} /** * * Clear this app sharedpreference (/data/data/com.xxx.xxx/shared_prefs) * * @param * context */public static void CLEANSHAREDPR Eference (Context context) {Deletefilesbydirectory (New File ("/data/data/" + CoNtext.getpackagename () + "/shared_prefs");} /** * Clear the application database by name * * @param context * @param dbName */public static void Cleandatabasebyname (context context, String Dbna Me) {context.deletedatabase (dbName);} /** * Clear the contents of/data/data/com.xxx.xxx/files * * @param context */public static void Cleanfiles (context context) {Deletefilesb Ydirectory (Context.getfilesdir ());} /** * * Clear the contents of the external cache (/mnt/sdcard/android/data/com.xxx.xxx/cache) * * @param * context */public static void Cleanexternalc Ache (context context) {if (Environment.getexternalstoragestate (). Equals (environment.media_mounted)) { Deletefilesbydirectory (Context.getexternalcachedir ());}} /** * Clear the files under your defined path. Use caution. Please do not delete it by mistake. And only supports file deletion under Folders * * @param filePath */public static void Cleancustomcache (String filePath) {deletefilesbydirectory (new Fi Le (FilePath));} /** * Clear all data for this application * * @param context * @param filepath */public static void Cleanapplicationdata (context context, String: . FilePath) {Cleaninternalcache (context); Cleanexternalcache (context); CleaNdatabases (context); cleansharedpreference (context); Cleanfiles (context); for (String Filepath:filepath) { Cleancustomcache (FilePath);}} /** * Delete Method only the files under a folder are deleted, assuming that the incoming directory is a file that will not be processed * * @param directory */private static void Deletefilesbydirectory (Fi Le directory) {if (directory! = null && directory.exists () && directory.isdirectory ()) {for (File item:d Irectory.listfiles ()) {Item.delete ();}}}}

Mainactivity.java

Package Com.yqy.yqy_cache;import Android.app.activity;import Android.os.bundle;import android.util.Log;import Android.view.menu;import Android.view.view;import Android.view.view.onclicklistener;import Android.webkit.WebView Import Android.widget.button;public class Mainactivity extends Activity {private Button btn_clear;private WebView wv;@ overrideprotected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate); Setcontentview ( R.layout.activity_main) Btn_clear = (Button) Findviewbyid (r.id.btn_clear); WV = (WebView) Findviewbyid (R.ID.WV); btn_ Clear.setonclicklistener (New Onclicklistener () {@Overridepublic void OnClick (View arg0) {//TODO auto-generated method Stubtry {//view cache size LOG.E ("YQY", Datacleanmanager.gettotalcachesize (Mainactivity.this));} catch (Exception e) { E.printstacktrace ();} Clear Operation Datacleanmanager.clearallcache (Mainactivity.this), try {//clear operation LOG.E ("YQY", Datacleanmanager.gettotalcachesize (Mainactivity.this));} catch (Exception e) {e.printstacktrace ();}}}); Wv.loadurl ("http://www.baidu.com");} @Overridepublic boolean Oncreateoptionsmenu (Menu menu) {//Inflate the menu; This adds items to the action bar if it is PR Esent.getmenuinflater (). Inflate (R.menu.main, menu); return true;}}

Activity_main. Xml

<relativelayout xmlns:android= "http://schemas.android.com/apk/res/android"    xmlns:tools= "http// Schemas.android.com/tools "    android:layout_width=" match_parent "    android:layout_height=" Match_parent "    tools:context= ". Mainactivity ">    <button        android:id=" @+id/btn_clear "        android:layout_width=" Wrap_content        " android:layout_height= "Wrap_content"        android:layout_alignparentbottom= "true"        android:layout_ Centerhorizontal= "true"        android:text= "Clear Cache"/>    <webview        android:id= "@+id/wv"        android: Layout_width= "Match_parent"        android:layout_height= "match_parent"        android:layout_above= "@+id/btn_ Clear "        android:layout_alignparenttop=" true "        android:layout_centerhorizontal=" true "/></ Relativelayout>

Android Clear Cache Feature