Android中应用程序清除data/data，清除cache，超详细

清除data，清除cache，其实在Android原生Setting里面有这个功能的。

需求是把这个功能做到自己的App里面，并计算出cache和data的size。

所以参考了一下Setting的源码。看如何实现该功能:

首先需要写两个aidl去调用系统的清除以及获取size功能：

IPackageStatsObserver.aidl  -- 获取data以及cache的size

/*  **  ** Copyright 2007, The Android Open Source Project  **  ** Licensed under the Apache License, Version 2.0 (the "License");  ** you may 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  ** distributed under the License is distributed on an "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 Package 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 succeeded);  }

IPackageDataObserver.aidl -- 清除完成

/*    **    ** Copyright 2007, The Android Open Source Project    **    ** Licensed under the Apache License, Version 2.0 (the "License");    ** you may 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    ** distributed under the License is distributed on an "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;        /**     * API for package data change related callbacks from the Package 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);    }

然后Java代码实现：

private Handler handler=new Handler(){    public void handleMessage(android.os.Message msg) {     switch (msg.what) {     case Constant.Hanler.MSG_GET_DATASIZE:      String size=Formatter.formatFileSize(AppDetialActivity.this, catcheSize);      tv_catcheSize.setText(size);      break;     case Constant.Hanler.MSG_CLEAR_DATA_SUCCESS:      String pkgname=(String) msg.obj;      getSize(pkgname);      break;     default:      break;     }    };   };

通过包名清除数据

private ClearUserDataObserver mClearDataObserver;   private void clearData(String packagename){    if (mClearDataObserver == null) {     mClearDataObserver = new ClearUserDataObserver();    }    ActivityManager am = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);    boolean res = am.clearApplicationUserData(packageName,      mClearDataObserver);    if (!res) {     // Clearing data failed for some obscure reason. Just log error for now     Log.i(TAG, "Couldnt clear application user data for package:"       + packageName);     showToast("Clear failed");    } else {         }   }

清除完成回调

class ClearUserDataObserver extends IPackageDataObserver.Stub {          public void onRemoveCompleted(final String packageName, final boolean succeeded) {           Logger.d(TAG, "packageName "+packageName +"   succeeded  "+succeeded);           if(succeeded){             Message msg=Message.obtain();             msg.what=Constant.Hanler.MSG_CLEAR_DATA_SUCCESS;             msg.obj=packageName;             handler.sendMessage(msg);              }           }       }

获取data,cache文件size

private void getSize(String packageName) {    if (!Util.isNullStr(packageName)) {     PackageManager pManager = getPackageManager();     pManager.getPackageSizeInfo(packageName, statsObserver);    }   }     IPackageStatsObserver statsObserver = new IPackageStatsObserver.Stub() {    @Override    public void onGetStatsCompleted(PackageStats pStats, boolean succeeded)      throws RemoteException {     // TODO Auto-generated method stub     catcheSize = pStats.dataSize;     handler.sendEmptyMessage(Constant.Hanler.MSG_GET_DATASIZE);    }   };

到此就OK~~~~~~~~