Android一键清除某个应用下的数据

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#android #批量删除通讯录 #清除应用数据

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本文介绍了三种清除Android应用数据的方法，包括通过ContactsContract进行删除，遍历删除以及使用隐藏的ActivityManager.clearApplicationUserData方法。重点讲述了如何使用反射调用系统权限的方法来一键清除特定应用，如通讯录数据，并强调了设置系统进程权限和Android.mk文件的重要性。

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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" />