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/*
* Copyright (C) 2008 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;
import android.accounts.Account;
import android.accounts.AccountManager;
import android.accounts.AuthenticatorDescription;
import android.app.Activity;
import android.app.Fragment;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.res.Resources;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.os.Environment;
import android.os.SystemProperties;
import android.preference.Preference;
import android.preference.PreferenceActivity;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.LinearLayout;
import android.widget.TextView;
/**
* Confirm and execute a reset of the device to a clean "just out of the box"
* state. Multiple confirmations are required: first, a general "are you sure
* you want to do this?" prompt, followed by a keyguard pattern trace if the user
* has defined one, followed by a final strongly-worded "THIS WILL ERASE EVERYTHING
* ON THE PHONE" prompt. If at any time the phone is allowed to go to sleep, is
* locked, et cetera, then the confirmation sequence is abandoned.
*
* This is the initial screen.
*/
public class MasterClear extends Fragment {
private static final String TAG = "MasterClear";
private static final int KEYGUARD_REQUEST = 55;
static final String ERASE_EXTERNAL_EXTRA = "erase_sd";
private View mContentView;
private Button mInitiateButton;
private View mExternalStorageContainer;
private CheckBox mExternalStorage;
/**
* Keyguard validation is run using the standard {@link ConfirmLockPattern}
* component as a subactivity
* @param request the request code to be returned once confirmation finishes
* @return true if confirmation launched
*/
private boolean runKeyguardConfirmation(int request) {
Resources res = getActivity().getResources();
return new ChooseLockSettingsHelper(getActivity(), this)
.launchConfirmationActivity(request,
res.getText(R.string.master_clear_gesture_prompt),
res.getText(R.string.master_clear_gesture_explanation));
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode != KEYGUARD_REQUEST) {
return;
}
// If the user entered a valid keyguard trace, present the final
// confirmation prompt; otherwise, go back to the initial state.
if (resultCode == Activity.RESULT_OK) {
showFinalConfirmation();
} else {
establishInitialState();
}
}
private void showFinalConfirmation() {
Preference preference = new Preference(getActivity());
preference.setFragment(MasterClearConfirm.class.getName());
preference.setTitle(R.string.master_clear_confirm_title);
preference.getExtras().putBoolean(ERASE_EXTERNAL_EXTRA, mExternalStorage.isChecked());
((PreferenceActivity) getActivity()).onPreferenceStartFragment(null, preference);
}
/**
* If the user clicks to begin the reset sequence, we next require a
* keyguard confirmation if the user has currently enabled one. If there
* is no keyguard available, we simply go to the final confirmation prompt.
*/
private final Button.OnClickListener mInitiateListener = new Button.OnClickListener() {
public void onClick(View v) {
if (!runKeyguardConfirmation(KEYGUARD_REQUEST)) {
showFinalConfirmation();
}
}
};
/**
* In its initial state, the activity presents a button for the user to
* click in order to initiate a confirmation sequence. This method is
* called from various other points in the code to reset the activity to
* this base state.
*
* <p>Reinflating views from resources is expensive and prevents us from
* caching widget pointers, so we use a single-inflate pattern: we lazy-
* inflate each view, caching all of the widget pointers we'll need at the
* time, then simply reuse the inflated views directly whenever we need
* to change contents.
*/
private void establishInitialState() {
mInitiateButton = (Button) mContentView.findViewById(R.id.initiate_master_clear);
mInitiateButton.setOnClickListener(mInitiateListener);
mExternalStorageContainer = mContentView.findViewById(R.id.erase_external_container);
mExternalStorage = (CheckBox) mContentView.findViewById(R.id.erase_external);
/*
* If the external storage is emulated, it will be erased with a factory
* reset at any rate. There is no need to have a separate option until
* we have a factory reset that only erases some directories and not
* others. Likewise, if it's non-removable storage, it could potentially have been
* encrypted, and will also need to be wiped.
*/
boolean isExtStorageEmulated = Environment.isExternalStorageEmulated();
if (isExtStorageEmulated
|| (!Environment.isExternalStorageRemovable() && isExtStorageEncrypted())) {
mExternalStorageContainer.setVisibility(View.GONE);
final View externalOption = mContentView.findViewById(R.id.erase_external_option_text);
externalOption.setVisibility(View.GONE);
final View externalAlsoErased = mContentView.findViewById(R.id.also_erases_external);
externalAlsoErased.setVisibility(View.VISIBLE);
// If it's not emulated, it is on a separate partition but it means we're doing
// a force wipe due to encryption.
mExternalStorage.setChecked(!isExtStorageEmulated);
} else {
mExternalStorageContainer.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mExternalStorage.toggle();
}
});
}
loadAccountList();
}
private boolean isExtStorageEncrypted() {
String state = SystemProperties.get("vold.decrypt");
return !"".equals(state);
}
private void loadAccountList() {
View accountsLabel = mContentView.findViewById(R.id.accounts_label);
LinearLayout contents = (LinearLayout)mContentView.findViewById(R.id.accounts);
contents.removeAllViews();
Context context = getActivity();
AccountManager mgr = AccountManager.get(context);
Account[] accounts = mgr.getAccounts();
final int N = accounts.length;
if (N == 0) {
accountsLabel.setVisibility(View.GONE);
contents.setVisibility(View.GONE);
return;
}
LayoutInflater inflater = (LayoutInflater)context.getSystemService(
Context.LAYOUT_INFLATER_SERVICE);
AuthenticatorDescription[] descs = AccountManager.get(context).getAuthenticatorTypes();
final int M = descs.length;
for (int i=0; i<N; i++) {
Account account = accounts[i];
AuthenticatorDescription desc = null;
for (int j=0; j<M; j++) {
if (account.type.equals(descs[j].type)) {
desc = descs[j];
break;
}
}
if (desc == null) {
Log.w(TAG, "No descriptor for account name=" + account.name
+ " type=" + account.type);
continue;
}
Drawable icon = null;
try {
if (desc.iconId != 0) {
Context authContext = context.createPackageContext(desc.packageName, 0);
icon = authContext.getResources().getDrawable(desc.iconId);
}
} catch (PackageManager.NameNotFoundException e) {
Log.w(TAG, "No icon for account type " + desc.type);
}
TextView child = (TextView)inflater.inflate(R.layout.master_clear_account,
contents, false);
child.setText(account.name);
if (icon != null) {
child.setCompoundDrawablesWithIntrinsicBounds(icon, null, null, null);
}
contents.addView(child);
}
accountsLabel.setVisibility(View.VISIBLE);
contents.setVisibility(View.VISIBLE);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
mContentView = inflater.inflate(R.layout.master_clear, null);
establishInitialState();
return mContentView;
}
}
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