Clean up choose lock intent creation

Consolidated the many variants of ChooseLock*.createIntent, so that
it will take the same set of arguments.

Also modified SetupChooseLock*.createIntent to modifyIntentForSetup,
which will take the intent created by ChooseLock* and modify it for
use with setup.

Test: cd tests/robotests && mma
Change-Id: I5ff033f459c33ec9980872a536b3996d89f2bbbb

src/com/android/settings/password/SaveChosenLockWorkerBase.java

@@ -0,0 +1,125 @@
+/*
+ * 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.password;
+
+import android.app.Fragment;
+import android.content.Context;
+import android.content.Intent;
+import android.os.AsyncTask;
+import android.os.Bundle;
+import android.os.UserManager;
+
+import com.android.internal.widget.LockPatternUtils;
+
+/**
+ * An invisible retained worker fragment to track the AsyncWork that saves (and optionally
+ * verifies if a challenge is given) the chosen lock credential (pattern/pin/password).
+ */
+abstract class SaveChosenLockWorkerBase extends Fragment {
+
+    private Listener mListener;
+    private boolean mFinished;
+    private Intent mResultData;
+
+    protected LockPatternUtils mUtils;
+    protected boolean mHasChallenge;
+    protected long mChallenge;
+    protected boolean mWasSecureBefore;
+    protected int mUserId;
+
+    private boolean mBlocking;
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setRetainInstance(true);
+    }
+
+    public void setListener(Listener listener) {
+        if (mListener == listener) {
+            return;
+        }
+
+        mListener = listener;
+        if (mFinished && mListener != null) {
+            mListener.onChosenLockSaveFinished(mWasSecureBefore, mResultData);
+        }
+    }
+
+    protected void prepare(LockPatternUtils utils, boolean credentialRequired,
+            boolean hasChallenge, long challenge, int userId) {
+        mUtils = utils;
+        mUserId = userId;
+
+        mHasChallenge = hasChallenge;
+        mChallenge = challenge;
+        // This will be a no-op for non managed profiles.
+        mWasSecureBefore = mUtils.isSecure(mUserId);
+
+        Context context = getContext();
+        // If context is null, we're being invoked to change the setCredentialRequiredToDecrypt,
+        // and we made sure that this is the primary user already.
+        if (context == null || UserManager.get(context).getUserInfo(mUserId).isPrimary()) {
+            mUtils.setCredentialRequiredToDecrypt(credentialRequired);
+        }
+
+        mFinished = false;
+        mResultData = null;
+    }
+
+    protected void start() {
+        if (mBlocking) {
+            finish(saveAndVerifyInBackground());
+        } else {
+            new Task().execute();
+        }
+    }
+
+    /**
+     * Executes the save and verify work in background.
+     * @return Intent with challenge token or null.
+     */
+    protected abstract Intent saveAndVerifyInBackground();
+
+    protected void finish(Intent resultData) {
+        mFinished = true;
+        mResultData = resultData;
+        if (mListener != null) {
+            mListener.onChosenLockSaveFinished(mWasSecureBefore, mResultData);
+        }
+    }
+
+    public void setBlocking(boolean blocking) {
+        mBlocking = blocking;
+    }
+
+    private class Task extends AsyncTask<Void, Void, Intent> {
+        @Override
+        protected Intent doInBackground(Void... params){
+            return saveAndVerifyInBackground();
+        }
+
+        @Override
+        protected void onPostExecute(Intent resultData) {
+            finish(resultData);
+        }
+    }
+
+    interface Listener {
+        public void onChosenLockSaveFinished(boolean wasSecureBefore, Intent resultData);
+    }
+}