Android恢復出廠設定原始碼分析，基於Android 6.0
阿新 • • 發佈：2018-12-30
近兩天解決一些關於恢復出廠設定的問題，對此略有了解，註釋了部分程式碼，給大家分享
設定>>>備份與重置>>>恢復出廠設定>>>… …
對應得類的路徑：
\packages\apps\Settings\src\com\android\settings\MasterClear.java
程式碼如下所示：
package com.android.settings;
import android.accounts.Account;
import android.accounts.AccountManager;
import android.accounts.AuthenticatorDescription;
import 該類的佈局：
\packages\apps\Settings\res\layout\master_clear.xml
<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright (C) 2010 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.
-->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
>
<ScrollView
android:layout_width="match_parent"
android:layout_height="0dip"
android:layout_marginStart="12dp"
android:layout_marginEnd="12dp"
android:layout_marginTop="12dp"
android:layout_weight="1">
<LinearLayout android:id="@+id/master_clear_container"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:includeFontPadding="false"
android:textSize="18sp"
android:text="@string/master_clear_desc" />
<TextView android:id="@+id/also_erases_external"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:includeFontPadding="false"
android:visibility="gone"
android:textSize="18sp"
android:text="@string/master_clear_desc_also_erases_external" />
<TextView android:id="@+id/accounts_label"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:visibility="gone"
android:textSize="18sp"
android:text="@string/master_clear_accounts" />
<LinearLayout android:id="@+id/accounts"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:visibility="gone">
<!-- Do not add any children here as they will be removed in the MasterClear.java
code. A list of accounts will be inserted programmatically. -->
</LinearLayout>
<TextView android:id="@+id/other_users_present"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:visibility="gone"
android:textSize="18sp"
android:text="@string/master_clear_other_users_present" />
<TextView android:id="@+id/erase_external_option_text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="18sp"
android:text="@string/master_clear_desc_erase_external_storage" />
<LinearLayout android:id="@+id/erase_external_container"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:focusable="true"
android:clickable="true">
<CheckBox android:id="@+id/erase_external"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:paddingEnd="8dp"
android:focusable="false"
android:clickable="false"
android:duplicateParentState="true" />
<LinearLayout android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingTop="12dp"
android:textSize="18sp"
android:text="@string/erase_external_storage" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingTop="4sp"
android:textSize="14sp"
android:text="@string/erase_external_storage_description" />
</LinearLayout>
</LinearLayout>
</LinearLayout>
</ScrollView>
<Button
android:id="@+id/initiate_master_clear"
android:layout_gravity="center_horizontal"
android:layout_marginTop="20dip"
android:layout_marginBottom="12dip"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/master_clear_button_text"
android:gravity="center" />
</LinearLayout>
跳轉到下一個類，也就是恢復出廠設定核心類：
\packages\apps\Settings\src\com\android\settings\MasterClearConfirm.java
這裡只貼出主要部分程式碼
/*恢復出廠設定方法 傳送一個廣播,（！！！ 以前舊版本會在此活動介面新增是否格式化外部儲存的複選框 根據複選框的值來發送不同的廣播））*/
private void doMasterClear() {
Intent intent = new Intent(Intent.ACTION_MASTER_CLEAR);
intent.addFlags(Intent.FLAG_RECEIVER_FOREGROUND);
intent.putExtra(Intent.EXTRA_REASON, "MasterClearConfirm");
intent.putExtra(Intent.EXTRA_WIPE_EXTERNAL_STORAGE, mEraseSdCard);
getActivity().sendBroadcast(intent);
// Intent handling is asynchronous -- assume it will happen soon.
}該類的佈局檔案：
<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright (C) 2010 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.
-->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
>
<TextView
android:id="@+id/master_clear_confirm"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="12dp"
android:layout_marginEnd="12dp"
android:layout_marginTop="12dp"
android:textSize="20sp"
android:text="@string/master_clear_final_desc" />
<Button android:id="@+id/execute_master_clear"
android:layout_gravity="center_horizontal"
android:layout_marginTop="40dip"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/master_clear_final_button_text"
android:gravity="center" />
</LinearLayout>作者水平有限，有不對之處，敬請諒解，指正！謝謝！