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/*
* 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;
import android.app.Fragment;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.UserHandle;
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;
@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) {
mUtils = utils;
mHasChallenge = hasChallenge;
mChallenge = challenge;
mWasSecureBefore = mUtils.isSecure(UserHandle.myUserId());
mUtils.setCredentialRequiredToDecrypt(credentialRequired);
mFinished = false;
mResultData = null;
}
protected void start() {
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);
}
}
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);
}
}
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