MediaFormat.java revision 1feaa85791b3b5cc66a16142afc2259a2356bc9e 
1/*
2 * Copyright (C) 2008 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.settings;
18
19import com.android.internal.widget.LockPatternUtils;
20
21import android.app.Activity;
22import android.app.AlertDialog;
23import android.content.Context;
24import android.content.Intent;
25import android.os.Bundle;
26import android.os.IMountService;
27import android.os.ServiceManager;
28import android.os.SystemProperties;
29import android.os.Environment;
30import android.text.TextUtils;
31import android.util.Log;
32import android.view.LayoutInflater;
33import android.view.View;
34import android.widget.Button;
35
36/**
37 * Confirm and execute a format of the sdcard.
38 * Multiple confirmations are required: first, a general "are you sure
39 * you want to do this?" prompt, followed by a keyguard pattern trace if the user
40 * has defined one, followed by a final strongly-worded "THIS WILL ERASE EVERYTHING
41 * ON THE SD CARD" prompt.  If at any time the phone is allowed to go to sleep, is
42 * locked, et cetera, then the confirmation sequence is abandoned.
43 */
44public class MediaFormat extends Activity {
45
46    private static final int KEYGUARD_REQUEST = 55;
47
48    private LayoutInflater mInflater;
49    private LockPatternUtils mLockUtils;
50
51    private View mInitialView;
52    private Button mInitiateButton;
53
54    private View mFinalView;
55    private Button mFinalButton;
56
57    /**
58     * The user has gone through the multiple confirmation, so now we go ahead
59     * and invoke the Mount Service to format the SD card.
60     */
61    private Button.OnClickListener mFinalClickListener = new Button.OnClickListener() {
62            public void onClick(View v) {
63
64                // Those monkeys kept committing suicide, so we add this property
65                // to disable going through with the format
66                if (!TextUtils.isEmpty(SystemProperties.get("ro.monkey"))) {
67                    return;
68                }
69                IMountService service =
70                        IMountService.Stub.asInterface(ServiceManager.getService("mount"));
71                if (service != null) {
72                    try {
73                        service.formatMedia(Environment.getExternalStorageDirectory().toString());
74                    } catch (android.os.RemoteException e) {
75                        // Intentionally blank - there's nothing we can do here
76                        Log.w("MediaFormat", "Unable to invoke IMountService.formatMedia()");
77                    }
78                } else {
79                    Log.w("MediaFormat", "Unable to locate IMountService");
80                }
81            finish();
82            }
83        };
84
85    /**
86     *  Keyguard validation is run using the standard {@link ConfirmLockPattern}
87     * component as a subactivity
88     */
89    private void runKeyguardConfirmation() {
90        final Intent intent = new Intent();
91        intent.setClassName("com.android.settings",
92                "com.android.settings.ConfirmLockPattern");
93        // supply header and footer text in the intent
94        intent.putExtra(ConfirmLockPattern.HEADER_TEXT,
95                getText(R.string.media_format_gesture_prompt));
96        intent.putExtra(ConfirmLockPattern.FOOTER_TEXT,
97                getText(R.string.media_format_gesture_explanation));
98        startActivityForResult(intent, KEYGUARD_REQUEST);
99    }
100
101    @Override
102    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
103        super.onActivityResult(requestCode, resultCode, data);
104
105        if (requestCode != KEYGUARD_REQUEST) {
106            return;
107        }
108
109        // If the user entered a valid keyguard trace, present the final
110        // confirmation prompt; otherwise, go back to the initial state.
111        if (resultCode == Activity.RESULT_OK) {
112            establishFinalConfirmationState();
113        } else {
114            establishInitialState();
115        }
116    }
117
118    /**
119     * If the user clicks to begin the reset sequence, we next require a
120     * keyguard confirmation if the user has currently enabled one.  If there
121     * is no keyguard available, we simply go to the final confirmation prompt.
122     */
123    private Button.OnClickListener mInitiateListener = new Button.OnClickListener() {
124            public void onClick(View v) {
125                if (mLockUtils.isLockPatternEnabled()) {
126                    runKeyguardConfirmation();
127                } else {
128                    establishFinalConfirmationState();
129                }
130            }
131        };
132
133    /**
134     * Configure the UI for the final confirmation interaction
135     */
136    private void establishFinalConfirmationState() {
137        if (mFinalView == null) {
138            mFinalView = mInflater.inflate(R.layout.media_format_final, null);
139            mFinalButton =
140                    (Button) mFinalView.findViewById(R.id.execute_media_format);
141            mFinalButton.setOnClickListener(mFinalClickListener);
142        }
143
144        setContentView(mFinalView);
145    }
146
147    /**
148     * In its initial state, the activity presents a button for the user to
149     * click in order to initiate a confirmation sequence.  This method is
150     * called from various other points in the code to reset the activity to
151     * this base state.
152     *
153     * <p>Reinflating views from resources is expensive and prevents us from
154     * caching widget pointers, so we use a single-inflate pattern:  we lazy-
155     * inflate each view, caching all of the widget pointers we'll need at the
156     * time, then simply reuse the inflated views directly whenever we need
157     * to change contents.
158     */
159    private void establishInitialState() {
160        if (mInitialView == null) {
161            mInitialView = mInflater.inflate(R.layout.media_format_primary, null);
162            mInitiateButton =
163                    (Button) mInitialView.findViewById(R.id.initiate_media_format);
164            mInitiateButton.setOnClickListener(mInitiateListener);
165        }
166
167        setContentView(mInitialView);
168    }
169
170    @Override
171    protected void onCreate(Bundle savedState) {
172        super.onCreate(savedState);
173
174        mInitialView = null;
175        mFinalView = null;
176        mInflater = LayoutInflater.from(this);
177        mLockUtils = new LockPatternUtils(getContentResolver());
178
179        establishInitialState();
180    }
181
182    /** Abandon all progress through the confirmation sequence by returning
183     * to the initial view any time the activity is interrupted (e.g. by
184     * idle timeout).
185     */
186    @Override
187    public void onPause() {
188        super.onPause();
189
190        establishInitialState();
191    }
192
193}
194