Android一键清除某个应用下的数据

Android一键清除某个应用下的数据，我这里是针对android自带通讯录的数据清除，当初我用了几个方式来清理数据库，当初试用的数据估计有1000个联系人吧，当然跟自己存联系人的方式有关系，我这里用RawContacts表存联系人的基本信息，用data存联系人的详细信息，group是来存分类：

方式1：

把ContactsContract.CALLER_IS_SYNCADAPTER设置为true就能删除通讯录里的数据，

      Uri uri = ContactsContract.RawContacts.CONTENT_URI.buildUpon().appendQueryParameter(ContactsContract.CALLER_IS_SYNCADAPTER, "true").build();

getContentResolver().delete(uri,null,null);

this.getContentResolver().delete(Data.CONTENT_URI.buildUpon()

        .appendQueryParameter(ContactsContract.CALLER_IS_SYNCADAPTER,"true").build(), null

        , null);

getContentResolver().delete(ContactsContract.Data.CONTENT_URI,null,null);

      uri = ContactsContract.Groups.CONTENT_URI.buildUpon().appendQueryParameter(ContactsContract.CALLER_IS_SYNCADAPTER, "true").build();

getContentResolver().delete(uri,null,null);

 

花费时间在10秒左右，

方式2:

     Cursor contactsCur = SdmLoginActivity.this.getContentResolver().query(ContactsContract.Contacts.CONTENT_URI, null, null, null, null);

      while(contactsCur.moveToNext()){ 

       //获取ID

      String rawId = contactsCur.getString(contactsCur.getColumnIndex(ContactsContract.Contacts._ID));

       //删除

      String where = ContactsContract.Data._ID + " =?";

       String[] whereparams = new String[]{rawId};

       getContentResolver().delete(ContactsContract.RawContacts.CONTENT_URI, where, whereparams);

     }

     if (contactsCur!=null) {

       contactsCur.close();

       contactsCur = null;

      }

耗费时间在20多秒左右,比上一种还慢.

方式3是在这里推荐的,在设置里有一个清除各个应用数据的地方,一般是设置->应用->选中自己的应用->清除数据就能清,该方式的耗费时间普遍在100毫秒左右,用7000多数据测花费时间也在100毫秒左右

设置里面用的方法是:

    private  void initiateClearUserData() {

        mClearDataButton.setEnabled(false);

        // Invoke uninstall or clear user data based on sysPackage

        String packageName = mAppEntry.info.packageName;

        Log.i(TAG, "Clearing user data for package : " + packageName);

        if (mClearDataObserver == null) {

            mClearDataObserver = new ClearUserDataObserver();

        }

        ActivityManager am = (ActivityManager)

                getActivity().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);

            showDialogInner(DLG_CANNOT_CLEAR_DATA, 0);

        } else {

            mClearDataButton.setText(R.string.recompute_size);

        }

    }

核心代码是:

ActivityManager am = (ActivityManager)

                getActivity().getSystemService(Context.ACTIVITY_SERVICE);

am.clearApplicationUserData(packageName, mClearDataObserver);

而该方法是隐藏的方法只能通过反射方式调用

具体步骤:

1\在自己的应用上建一个包,包名:

android.content.pm

2\拷贝一下三个aidl到android.content.pm包下

IPackageDataObserver.aidl文件：

/**

**

** 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);

}

------------------------------------------------------------------------------------------------------

IPackageStatsObserver.aidl文件：

/*

**

** 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);

}

---------------------------------------------------------------------------------------------------

PackageStats.addl文件：

/* //device/java/android/android/view/WindowManager.aidl

**

** 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;

parcelable PackageStats;

3/IPackageStatsObserver这个类生成的桩

 class ClearUserDataObserver extends IPackageDataObserver.Stub {

        public void onRemoveCompleted(final String packageName, final boolean succeeded) {

//            final Message msg = mHandler.obtainMessage(CLEAR_USER_DATA);

//            msg.arg1 = succeeded?OP_SUCCESSFUL:OP_FAILED;

//            mHandler.sendMessage(msg);

         }

     }

4/调用核心方法,我这里是通讯录,其系统自带通讯录包名:com.android.providers.contacts

用

Method method = am.getClass().getDeclaredMethod("clearApplicationUserData", IPackageDataObserver.class);

method.invoke(am, "com.android.providers.contacts", new ClearUserDataObserver());

或者：

      ActivityManager am = (ActivityManager) SdmLoginActivity.this.getSystemService(Context.ACTIVITY_SERVICE);

      Method methods[] = am.getClass().getMethods();

      for (int i = 0; i < methods.length; i++) {

              

                if ("clearApplicationUserData".equals(methods[i].getName())){ 

                    try {

                        methods[i].invoke(am, "com.android.providers.contacts", new ClearUserDataObserver());

break;

                    } catch (Exception e) {

                     

                    }

                }

            }

 

5/设置android.permission.CLEAR_APP_USER_DATA权限
google认为单单把clearApplicationUserData设置成@hide还不够安全，于是它要求执行clearApplicationUserData方法还需要应用具有android.permission.CLEAR_APP_USER_DATA权限。
在AndroidManifest.xml文件里面配置这个权限

<uses-permission android:name="android.permission.CLEAR_APP_USER_DATA" />

6/设置应用程序的系统进程权限

在AndroidManifest.xml的<manifest里面配置android:sharedUserId,如：

android:sharedUserId="android.uid.system"

7/编写Android.mk文件

在Android.mk文件，加入LOCAL_CERTIFICATE := platform这一行， 调用系统平台的签名