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The Android Open Source Project
193
src/com/android/settings/MediaFormat.java
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193
src/com/android/settings/MediaFormat.java
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/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.settings;
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import com.android.internal.widget.LockPatternUtils;
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import android.app.Activity;
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import android.app.AlertDialog;
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import android.content.Context;
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import android.content.Intent;
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import android.os.Bundle;
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import android.os.IMountService;
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import android.os.ServiceManager;
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import android.os.SystemProperties;
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import android.os.Environment;
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import android.text.TextUtils;
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import android.util.Log;
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import android.view.LayoutInflater;
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import android.view.View;
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import android.widget.Button;
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/**
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* Confirm and execute a format of the sdcard.
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* Multiple confirmations are required: first, a general "are you sure
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* you want to do this?" prompt, followed by a keyguard pattern trace if the user
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* has defined one, followed by a final strongly-worded "THIS WILL ERASE EVERYTHING
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* ON THE SD CARD" prompt. If at any time the phone is allowed to go to sleep, is
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* locked, et cetera, then the confirmation sequence is abandoned.
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*/
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public class MediaFormat extends Activity {
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private static final int KEYGUARD_REQUEST = 55;
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private LayoutInflater mInflater;
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private LockPatternUtils mLockUtils;
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private View mInitialView;
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private Button mInitiateButton;
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private View mFinalView;
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private Button mFinalButton;
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/**
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* The user has gone through the multiple confirmation, so now we go ahead
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* and invoke the Mount Service to format the SD card.
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*/
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private Button.OnClickListener mFinalClickListener = new Button.OnClickListener() {
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public void onClick(View v) {
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// Those monkeys kept committing suicide, so we add this property
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// to disable going through with the format
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if (!TextUtils.isEmpty(SystemProperties.get("ro.monkey"))) {
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return;
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}
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IMountService service =
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IMountService.Stub.asInterface(ServiceManager.getService("mount"));
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if (service != null) {
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try {
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service.formatMedia(Environment.getExternalStorageDirectory().toString());
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} catch (android.os.RemoteException e) {
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// Intentionally blank - there's nothing we can do here
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Log.w("MediaFormat", "Unable to invoke IMountService.formatMedia()");
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}
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} else {
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Log.w("MediaFormat", "Unable to locate IMountService");
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}
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finish();
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}
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};
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/**
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* Keyguard validation is run using the standard {@link ConfirmLockPattern}
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* component as a subactivity
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*/
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private void runKeyguardConfirmation() {
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final Intent intent = new Intent();
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intent.setClassName("com.android.settings",
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"com.android.settings.ConfirmLockPattern");
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// supply header and footer text in the intent
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intent.putExtra(ConfirmLockPattern.HEADER_TEXT,
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getText(R.string.media_format_gesture_prompt));
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intent.putExtra(ConfirmLockPattern.FOOTER_TEXT,
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getText(R.string.media_format_gesture_explanation));
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startActivityForResult(intent, KEYGUARD_REQUEST);
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}
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@Override
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protected void onActivityResult(int requestCode, int resultCode, Intent data) {
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super.onActivityResult(requestCode, resultCode, data);
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if (requestCode != KEYGUARD_REQUEST) {
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return;
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}
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// If the user entered a valid keyguard trace, present the final
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// confirmation prompt; otherwise, go back to the initial state.
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if (resultCode == Activity.RESULT_OK) {
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establishFinalConfirmationState();
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} else {
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establishInitialState();
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}
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}
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/**
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* If the user clicks to begin the reset sequence, we next require a
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* keyguard confirmation if the user has currently enabled one. If there
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* is no keyguard available, we simply go to the final confirmation prompt.
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*/
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private Button.OnClickListener mInitiateListener = new Button.OnClickListener() {
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public void onClick(View v) {
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if (mLockUtils.isLockPatternEnabled()) {
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runKeyguardConfirmation();
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} else {
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establishFinalConfirmationState();
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}
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}
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};
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/**
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* Configure the UI for the final confirmation interaction
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*/
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private void establishFinalConfirmationState() {
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if (mFinalView == null) {
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mFinalView = mInflater.inflate(R.layout.media_format_final, null);
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mFinalButton =
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(Button) mFinalView.findViewById(R.id.execute_media_format);
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mFinalButton.setOnClickListener(mFinalClickListener);
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}
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setContentView(mFinalView);
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}
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/**
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* In its initial state, the activity presents a button for the user to
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* click in order to initiate a confirmation sequence. This method is
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* called from various other points in the code to reset the activity to
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* this base state.
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*
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* <p>Reinflating views from resources is expensive and prevents us from
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* caching widget pointers, so we use a single-inflate pattern: we lazy-
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* inflate each view, caching all of the widget pointers we'll need at the
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* time, then simply reuse the inflated views directly whenever we need
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* to change contents.
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*/
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private void establishInitialState() {
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if (mInitialView == null) {
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mInitialView = mInflater.inflate(R.layout.media_format_primary, null);
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mInitiateButton =
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(Button) mInitialView.findViewById(R.id.initiate_media_format);
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mInitiateButton.setOnClickListener(mInitiateListener);
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}
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setContentView(mInitialView);
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}
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@Override
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protected void onCreate(Bundle savedState) {
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super.onCreate(savedState);
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mInitialView = null;
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mFinalView = null;
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mInflater = LayoutInflater.from(this);
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mLockUtils = new LockPatternUtils(getContentResolver());
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establishInitialState();
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}
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/** Abandon all progress through the confirmation sequence by returning
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* to the initial view any time the activity is interrupted (e.g. by
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* idle timeout).
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*/
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@Override
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public void onPause() {
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super.onPause();
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establishInitialState();
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}
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}
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