Android 8.1中Settings中恢复出厂设置流程

1、Settings中点击重置选项后进入的布局如下

packages/apps/Settings/res/xml/reset_dashboard_fragment.xml

<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreenxmlns:android="http://schemas.android.com/apk/res/android"xmlns:settings="http://schemas.android.com/apk/res/com.android.settings"android:title="@string/reset_dashboard_title"android:key="reset_dashboard_fragment_screen"><!-- Network reset --><com.android.settingslib.RestrictedPreferenceandroid:key="network_reset_pref"android:title="@string/reset_network_title"settings:userRestriction="no_network_reset"settings:useAdminDisabledSummary="true"android:fragment="com.android.settings.ResetNetwork" /><!-- Reset app preferences --><Preferenceandroid:key="reset_app_prefs"android:title="@string/reset_app_preferences" /><!-- Factory reset --><com.android.settingslib.RestrictedPreferenceandroid:key="factory_reset"android:title="@string/master_clear_title"settings:keywords="@string/keywords_factory_data_reset"settings:userRestriction="no_factory_reset"settings:useAdminDisabledSummary="true"android:fragment="com.android.settings.MasterClear" />
</PreferenceScreen>

2、如下是重置应用的逻辑处理

packages/apps/Settings/src/com/android/settings/applications/ResetAppPrefPreferenceController.java

package com.android.settings.applications;import android.content.Context;
import android.os.Bundle;
import android.support.v7.preference.Preference;
import android.text.TextUtils;import com.android.settings.core.PreferenceControllerMixin;
import com.android.settingslib.core.AbstractPreferenceController;
import com.android.settingslib.core.lifecycle.Lifecycle;
import com.android.settingslib.core.lifecycle.LifecycleObserver;
import com.android.settingslib.core.lifecycle.events.OnCreate;
import com.android.settingslib.core.lifecycle.events.OnSaveInstanceState;public class ResetAppPrefPreferenceController extends AbstractPreferenceControllerimplements PreferenceControllerMixin, LifecycleObserver, OnCreate, OnSaveInstanceState {privat ResetAppsHelper mResetAppsHelper;//ResetAppsHelper的是重点逻辑处理public ResetAppPrefPreferenceController(Context context, Lifecycle lifecycle) {super(context);mResetAppsHelper = new ResetAppsHelper(context);if (lifecycle != null) {lifecycle.addObserver(this);}}@Overridepublic boolean handlePreferenceTreeClick(Preference preference) {if (!TextUtils.equals(preference.getKey(), getPreferenceKey())) {return false;}mResetAppsHelper.buildResetDialog();return true;}@Overridepublic boolean isAvailable() {return true;}@Overridepublic String getPreferenceKey() {return "reset_app_prefs";}@Overridepublic void onCreate(Bundle savedInstanceState) {mResetAppsHelper.onRestoreInstanceState(savedInstanceState);}@Overridepublic void onSaveInstanceState(Bundle outState) {mResetAppsHelper.onSaveInstanceState(outState);}
}

3、packages/apps/Settings/src/com/android/settings/applications/ResetAppsHelper.java

/** Copyright (C) 2015 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 com.android.settings.applications;import static android.net.NetworkPolicyManager.POLICY_NONE;
import static android.net.NetworkPolicyManager.POLICY_REJECT_METERED_BACKGROUND;import android.app.ActivityManager;
import android.app.AlertDialog;
import android.app.AppOpsManager;
import android.app.INotificationManager;
import android.content.Context;
import android.content.DialogInterface;
import android.content.pm.ApplicationInfo;
import android.content.pm.IPackageManager;
import android.content.pm.PackageManager;
import android.net.NetworkPolicyManager;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.RemoteException;
import android.os.ServiceManager;
import android.os.UserHandle;
import android.webkit.IWebViewUpdateService;import com.android.settings.R;import java.util.List;public class ResetAppsHelper implements DialogInterface.OnClickListener,DialogInterface.OnDismissListener {private static final String EXTRA_RESET_DIALOG = "resetDialog";private final PackageManager mPm;private final IPackageManager mIPm;private final INotificationManager mNm;private final IWebViewUpdateService mWvus;private final NetworkPolicyManager mNpm;private final AppOpsManager mAom;private final Context mContext;private AlertDialog mResetDialog;public ResetAppsHelper(Context context) {mContext = context;mPm = context.getPackageManager();mIPm = IPackageManager.Stub.asInterface(ServiceManager.getService("package"));mNm = INotificationManager.Stub.asInterface(ServiceManager.getService(Context.NOTIFICATION_SERVICE));mWvus = IWebViewUpdateService.Stub.asInterface(ServiceManager.getService("webviewupdate"));mNpm = NetworkPolicyManager.from(context);mAom = (AppOpsManager) context.getSystemService(Context.APP_OPS_SERVICE);}public void onRestoreInstanceState(Bundle savedInstanceState) {if (savedInstanceState != null && savedInstanceState.getBoolean(EXTRA_RESET_DIALOG)) {buildResetDialog();}}public void onSaveInstanceState(Bundle outState) {if (mResetDialog != null) {outState.putBoolean(EXTRA_RESET_DIALOG, true);}}public void stop() {if (mResetDialog != null) {mResetDialog.dismiss();mResetDialog = null;}}void buildResetDialog() {if (mResetDialog == null) {mResetDialog = new AlertDialog.Builder(mContext).setTitle(R.string.reset_app_preferences_title).setMessage(R.string.reset_app_preferences_desc).setPositiveButton(R.string.reset_app_preferences_button, this).setNegativeButton(R.string.cancel, null).setOnDismissListener(this).show();}}@Overridepublic void onDismiss(DialogInterface dialog) {if (mResetDialog == dialog) {mResetDialog = null;}}@Overridepublic void onClick(DialogInterface dialog, int which) {if (mResetDialog != dialog) {return;}AsyncTask.execute(new Runnable() {@Overridepublic void run() {List<ApplicationInfo> apps = mPm.getInstalledApplications(PackageManager.GET_DISABLED_COMPONENTS);for (int i = 0; i < apps.size(); i++) {ApplicationInfo app = apps.get(i);try {mNm.setNotificationsEnabledForPackage(app.packageName, app.uid, true);} catch (android.os.RemoteException ex) {}if (!app.enabled) {if (mPm.getApplicationEnabledSetting(app.packageName)== PackageManager.COMPONENT_ENABLED_STATE_DISABLED_USER&& !isNonEnableableFallback(app.packageName)) {mPm.setApplicationEnabledSetting(app.packageName,PackageManager.COMPONENT_ENABLED_STATE_DEFAULT,PackageManager.DONT_KILL_APP);}}}try {mIPm.resetApplicationPreferences(UserHandle.myUserId());} catch (RemoteException e) {}mAom.resetAllModes();final int[] restrictedUids = mNpm.getUidsWithPolicy(POLICY_REJECT_METERED_BACKGROUND);final int currentUserId = ActivityManager.getCurrentUser();for (int uid : restrictedUids) {// Only reset for current userif (UserHandle.getUserId(uid) == currentUserId) {mNpm.setUidPolicy(uid, POLICY_NONE);}}}});}private boolean isNonEnableableFallback(String packageName) {try {return mWvus.isFallbackPackage(packageName);} catch (RemoteException e) {throw new RuntimeException(e);}}
}

4、packages/apps/Settings/res/layout/master_clear.xml

   <Buttonandroid: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" />

5、packages/apps/Settings/src/com/android/settings/MasterClear.java

mInitiateButton = (Button) mContentView.findViewById(R.id.initiate_master_clear);
mInitiateButton.setOnClickListener(mInitiateListener);
protected final Button.OnClickListener mInitiateListener = new Button.OnClickListener() {public void onClick(View view) {final Context context = view.getContext();if (Utils.isDemoUser(context)) {final ComponentName componentName = Utils.getDeviceOwnerComponent(context);if (componentName != null) {final Intent requestFactoryReset = new Intent().setPackage(componentName.getPackageName()).setAction(Intent.ACTION_FACTORY_RESET);context.startActivity(requestFactoryReset);}/*SPRD added for bug 692488, pop a dialog when low battery */} else if (mLevelpower < POWER_LIMIT) {mIsDialogShow = true;dialog();} else if (!runKeyguardConfirmation(KEYGUARD_REQUEST)) {showFinalConfirmation();}}};

6、packages/apps/Settings/res/layout/master_clear_confirm.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"><TextViewandroid: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>

7、packages/apps/Settings/src/com/android/settings/MasterClearConfirm.java

 private void establishFinalConfirmationState() {mContentView.findViewById(R.id.execute_master_clear).setOnClickListener(mFinalClickListener);}private Button.OnClickListener mFinalClickListener = new Button.OnClickListener() {public void onClick(View v) {if (Utils.isMonkeyRunning()) {return;}final PersistentDataBlockManager pdbManager = (PersistentDataBlockManager)getActivity().getSystemService(Context.PERSISTENT_DATA_BLOCK_SERVICE);final OemLockManager oemLockManager = (OemLockManager)getActivity().getSystemService(Context.OEM_LOCK_SERVICE);if (pdbManager != null && !oemLockManager.isOemUnlockAllowed() &&Utils.isDeviceProvisioned(getActivity())) {// if OEM unlock is allowed, the persistent data block will be wiped during FR// process. If disabled, it will be wiped here, unless the device is still being// provisioned, in which case the persistent data block will be preserved.new AsyncTask<Void, Void, Void>() {int mOldOrientation;ProgressDialog mProgressDialog;@Overrideprotected Void doInBackground(Void... params) {pdbManager.wipe();return null;}@Overrideprotected void onPostExecute(Void aVoid) {mProgressDialog.hide();if (getActivity() != null) {getActivity().setRequestedOrientation(mOldOrientation);doMasterClear();}}@Overrideprotected void onPreExecute() {mProgressDialog = getProgressDialog();mProgressDialog.show();// need to prevent orientation changes as we're about to go into// a long IO request, so we won't be able to access inflate resources on flashmOldOrientation = getActivity().getRequestedOrientation();getActivity().setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LOCKED);}}.execute();} else {doMasterClear();}}private ProgressDialog getProgressDialog() {final ProgressDialog progressDialog = new ProgressDialog(getActivity());progressDialog.setIndeterminate(true);progressDialog.setCancelable(false);progressDialog.setTitle(getActivity().getString(R.string.master_clear_progress_title));progressDialog.setMessage(getActivity().getString(R.string.master_clear_progress_text));return progressDialog;}};

8、frameworks/base/services/core/java/com/android/server/MasterClearReceiver.java

public class MasterClearReceiver extends BroadcastReceiver {private static final String TAG = "MasterClear";private boolean mWipeExternalStorage;private boolean mWipeEsims;@Overridepublic void onReceive(final Context context, final Intent intent) {if (intent.getAction().equals(Intent.ACTION_REMOTE_INTENT)) {if (!"google.com".equals(intent.getStringExtra("from"))) {Slog.w(TAG, "Ignoring master clear request -- not from trusted server.");return;}}if (Intent.ACTION_MASTER_CLEAR.equals(intent.getAction())) {Slog.w(TAG, "The request uses the deprecated Intent#ACTION_MASTER_CLEAR, "+ "Intent#ACTION_FACTORY_RESET should be used instead.");}if (intent.hasExtra(Intent.EXTRA_FORCE_MASTER_CLEAR)) {Slog.w(TAG, "The request uses the deprecated Intent#EXTRA_FORCE_MASTER_CLEAR, "+ "Intent#EXTRA_FORCE_FACTORY_RESET should be used instead.");}final boolean shutdown = intent.getBooleanExtra("shutdown", false);final String reason = intent.getStringExtra(Intent.EXTRA_REASON);mWipeExternalStorage = intent.getBooleanExtra(Intent.EXTRA_WIPE_EXTERNAL_STORAGE, false);mWipeEsims = intent.getBooleanExtra(Intent.EXTRA_WIPE_ESIMS, false);final boolean forceWipe = intent.getBooleanExtra(Intent.EXTRA_FORCE_MASTER_CLEAR, false)|| intent.getBooleanExtra(Intent.EXTRA_FORCE_FACTORY_RESET, false);Slog.w(TAG, "!!! FACTORY RESET !!!");// The reboot call is blocking, so we need to do it on another thread.Thread thr = new Thread("Reboot") {@Overridepublic void run() {try {RecoverySystem.rebootWipeUserData(context, shutdown, reason, forceWipe, mWipeEsims);Log.wtf(TAG, "Still running after master clear?!");} catch (IOException e) {Slog.e(TAG, "Can't perform master clear/factory reset", e);} catch (SecurityException e) {Slog.e(TAG, "Can't perform master clear/factory reset", e);}}};if (mWipeExternalStorage || mWipeEsims) {// thr will be started at the end of this task.new WipeDataTask(context, thr).execute();} else {thr.start();}}private class WipeDataTask extends AsyncTask<Void, Void, Void> {private final Thread mChainedTask;private final Context mContext;private final ProgressDialog mProgressDialog;public WipeDataTask(Context context, Thread chainedTask) {mContext = context;mChainedTask = chainedTask;mProgressDialog = new ProgressDialog(context);}@Overrideprotected void onPreExecute() {mProgressDialog.setIndeterminate(true);mProgressDialog.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);mProgressDialog.setMessage(mContext.getText(R.string.progress_erasing));mProgressDialog.show();}@Overrideprotected Void doInBackground(Void... params) {Slog.w(TAG, "Wiping adoptable disks");if (mWipeExternalStorage) {StorageManager sm = (StorageManager) mContext.getSystemService(Context.STORAGE_SERVICE);sm.wipeAdoptableDisks();}return null;}@Overrideprotected void onPostExecute(Void result) {mProgressDialog.dismiss();mChainedTask.start();}}
}

9、frameworks/base/core/java/android/os/RecoverySystem.java

 public static void rebootWipeUserData(Context context, boolean shutdown, String reason,boolean force, boolean wipeEuicc) throws IOException {UserManager um = (UserManager) context.getSystemService(Context.USER_SERVICE);if (!force && um.hasUserRestriction(UserManager.DISALLOW_FACTORY_RESET)) {throw new SecurityException("Wiping data is not allowed for this user.");}final ConditionVariable condition = new ConditionVariable();Intent intent = new Intent("android.intent.action.MASTER_CLEAR_NOTIFICATION");intent.addFlags(Intent.FLAG_RECEIVER_FOREGROUND| Intent.FLAG_RECEIVER_INCLUDE_BACKGROUND);context.sendOrderedBroadcastAsUser(intent, UserHandle.SYSTEM,android.Manifest.permission.MASTER_CLEAR,new BroadcastReceiver() {@Overridepublic void onReceive(Context context, Intent intent) {condition.open();}}, null, 0, null, null);// Block until the ordered broadcast has completed.condition.block();wipeEuiccData(context, wipeEuicc);String shutdownArg = null;if (shutdown) {shutdownArg = "--shutdown_after";}String reasonArg = null;if (!TextUtils.isEmpty(reason)) {reasonArg = "--reason=" + sanitizeArg(reason);}final String localeArg = "--locale=" + Locale.getDefault().toLanguageTag() ;bootCommand(context, shutdownArg, "--wipe_data", reasonArg, localeArg);}private static void bootCommand(Context context, String... args) throws IOException {LOG_FILE.delete();StringBuilder command = new StringBuilder();for (String arg : args) {if (!TextUtils.isEmpty(arg)) {command.append(arg);command.append("\n");}}// Write the command into BCB (bootloader control block) and boot from// there. Will not return unless failed.RecoverySystem rs = (RecoverySystem) context.getSystemService(Context.RECOVERY_SERVICE);rs.rebootRecoveryWithCommand(command.toString());throw new IOException("Reboot failed (no permissions?)");}

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