More work on the CryptKeeper.

* There is now a 30 seconds delay after 10 failed password attempts.
* The device is factory reset after 30 failed password attempts.
* Implemented the progress UI for inplace encryption.

Change-Id: Ie830b03f9c84a117ee3048086275d6049907fa3c

src/com/android/settings/CryptKeeperSettings.java

@@ -0,0 +1,129 @@
+/*
+ * 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.app.Activity;
+import android.app.Fragment;
+import android.content.Intent;
+import android.content.res.Resources;
+import android.os.Bundle;
+import android.preference.Preference;
+import android.preference.PreferenceActivity;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.Button;
+
+/**
+ * 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 CryptKeeperSettings extends Fragment {
+    private static final String TAG = "CryptKeeper";
+
+    private static final int KEYGUARD_REQUEST = 55;
+
+    private View mContentView;
+    private Button mInitiateButton;
+
+    /**
+     * 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) {
+            String password = data.getStringExtra("password");
+            showFinalConfirmation(password);
+        } else {
+            establishInitialState();
+        }
+    }
+
+    private void showFinalConfirmation(String password) {
+        Preference preference = new Preference(getActivity());
+        preference.setFragment(CryptKeeperComfirm.class.getName());
+        preference.setTitle(R.string.crypt_keeper_confirm_title);
+        preference.getExtras().putString("password", password);
+        ((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 Button.OnClickListener mInitiateListener = new Button.OnClickListener() {
+
+        public void onClick(View v) {
+            if (!runKeyguardConfirmation(KEYGUARD_REQUEST)) {
+                // TODO: Need to request a password
+               // 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_encrypt);
+        mInitiateButton.setOnClickListener(mInitiateListener);
+    }
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedState) {
+        mContentView = inflater.inflate(R.layout.crypt_keeper_settings, null);
+
+        establishInitialState();
+        return mContentView;
+    }
+}
+