The realization of the access and cleanup function of mobile app cache

Package Com.loaderman.appcachedemo;import Android.content.pm.ipackagedataobserver;import Android.content.pm.ipackagestatsobserver;import Android.content.pm.packagemanager;import Android.content.pm.packagestats;import Android.os.bundle;import Android.os.remoteexception;import Android.support.v7.app.appcompatactivity;import Android.text.format.formatter;import Android.view.View;import Android.widget.button;import Java.io.file;import Java.io.fileoutputstream;import Java.lang.reflect.Method;public    Class Mainactivity extends Appcompatactivity {private Packagemanager MPM;    Private Button Btncache;    Private Button Btnclean;    Private long cacheSize;        @Override protected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);        Setcontentview (R.layout.activity_main);        Analog cache Monicache ();        Btncache = (Button) Findviewbyid (R.id.btn_cache);        Btnclean = (Button) Findviewbyid (R.id.btn_clean); MPM = Getpackagemanager ();    private void Monicache () {//Gets the current cache path: data/data/package name/cache File cachedir = Getcachedir ();        Write something inside the cache. analog file Cachefile = new file (Cachedir, "cache.txt");            try {fileoutputstream out = new FileOutputStream (cachefile);            Out.write ("Jfaklsdjfaklsdjfklasdjfkladsfjlkasdjflkasdflkasdjf". GetBytes ());            Out.flush ();        Out.close ();        } catch (Exception e) {e.printstacktrace ();    }} public void Startscan (view view) {Saomiaocache ();                    private void Saomiaocache () {try {method = Mpm.getclass (). GetMethod ("Getpackagesizeinfo",                String.class, Ipackagestatsobserver.class);            Method.invoke (MPM, Getpackagename (), New Myobserver ());            } catch (Exception e) {e.printstacktrace ();       }} public void Cleancache (view view) {try {method = Mpm.getclass (). GetMethod             ("Freestorageandnotify", Long.class, Ipackagedataobserver.class);                Method.invoke (MPM, Long.max_value, New Ipackagedataobserver.stub () {//Child threads @Override  public void onremovecompleted (String PackageName, Boolean succeeded) throws RemoteException {Runonuithread () {new Runnable () {@Override public void run (                       ) {Saomiaocache ();                }                   });        }            });        } catch (Exception e) {e.printstacktrace (); }} class Myobserver extends Ipackagestatsobserver.stub {//Run on child thread @Override public void Ongets            Tatscompleted (Packagestats pstats, Boolean succeeded) throws RemoteException {//Cache size            CacheSize = pstats.cachesize;            System.out.println (cacheSize); Runonuithread (New RunnAble () {@Override public void run () {btncache.settext ("Cache Size:" + Formatt                Er.formatfilesize (Getapplicationcontext (), cacheSize));        }            }); }    }}

Activity_main.xml

<?xml version= "1.0" encoding= "Utf-8"? ><linearlayout    xmlns:android= "http://schemas.android.com/apk/ Res/android "    xmlns:tools=" Http://schemas.android.com/tools "    android:id=" @+id/activity_main    " Android:layout_width= "Match_parent"    android:layout_height= "match_parent"    android:orientation= "vertical "    tools:context=" com.loaderman.appcachedemo.MainActivity ">    <button        android:id=" @+id/btn_ Cache "        android:onclick=" Startscan "        android:layout_width=" wrap_content "        android:layout_height=" Wrap_content "        android:text=" Scan cache "/>    <button        android:id=" @+id/btn_clean "        android:o nclick= "Cleancache"        android:layout_width= "wrap_content"        android:layout_height= "Wrap_content        " android:text= "Clean cache"/></linearlayout>

Add Permissions:

    <uses-permission android:name= "Android.permission.CLEAR_APP_CACHE"/>    <uses-permission android:name= "Android.permission.GET_PACKAGE_SIZE"/>

Create a aidl file below main

New package name is: android.content.pm

Ipackagedataobserver.aidl

/***** Copyright, the Android Open Source project**** Licensed under the Apache  License, Version 2.0 (the "License"); * * Do not use this file except in compliance with the license.**-may obtain A copy of the License at**** http://www.apache.org/licenses/license-2.0**** unless required by applicable law or Agre Ed to in writing, software** distributed under the License are distributed on a "as is" basis,** without warranties OR CON Ditions of any KIND, either express or implied.** see the License for the specific language governing permissions and** Li Mitations under the license.*/package android.content.pm;/** * API for package data change related callbacks from the Pack Age Manager.  * Some usage scenarios include deletion of cache directory, generate * Statistics related to code, data, Cache usage (TODO) * {@hide} */oneway interface Ipackagedataobserver {void onremovecompleted (in String PackageName, Boolean succeeded);} 

 ipackagestatsobserver.aidl

/***** Copyright, the Android Open Source project**** Licensed under the Apache License, Version 2.0 (the "License"); * * If you are not use this file except in compliance with the license.** you may obtain a copy of the License at**** http ://www.apache.org/licenses/license-2.0**** unless required by applicable law or agreed to in writing, software** Distribut  Ed under the License is distributed on a "as is" basis,** without warranties OR CONDITIONS of any KIND, either express or implied.** See the License for the specific language governing permissions and** limitations under the License.*/package Android.content.pm;import android.content.pm.packagestats;/** * API for package data change related callbacks from the Pac Kage Manager.  * Some usage scenarios include deletion of cache directory, generate * Statistics related to code, data, Cache usage (TODO) * {@hide} */oneway interface Ipackagestatsobserver {void ongetstatscompleted (in Packagestats pstats, Boolean succ eeded);}

Packagestats.aidl

/*//device/java/android/android/view/windowmanager.aidl**** Copyright, the android Open Source project**** Licensed under the Apache License, Version 2.0 (the "License"); * * Do not use this file except in compliance with the License. * * Obtain a copy of the License at * * * * * * * * * *     unless required by app Licable law or agreed to in writing, software * * Distributed under the License is distributed on a "as is" BASIS, * * with Out warranties or CONDITIONS of any KIND, either express or implied. * * See the License for the specific language governing permissions and * * Limitations under the License.*/package Android. Content.pm;parcelable Packagestats;

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To skip to the System app information page to clean up the cache:

Jump to System Application Information page        Intent infointent = new Intent ();        Infointent.setaction (settings.action_application_details_settings);        Uri uri = uri.fromparts ("Package", Getpackagename (), null),//uri.parse        //("Package:" + mcurrentinfo.packagename);        Infointent.setdata (URI);        StartActivity (infointent);

The realization of the access and cleanup function of mobile app cache