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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~~~~~~~~

原文 http://www.cnblogs.com/rencm/p/5157114.html

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