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StorageProvider / src / com.example.android.storageprovider /

MyCloudFragment.java

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/*
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* Copyright 2013 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.example.android.storageprovider;
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import android.content.SharedPreferences;
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import android.os.Bundle;
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import android.provider.DocumentsContract;
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import android.support.v4.app.Fragment;
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import android.view.Menu;
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import android.view.MenuItem;
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import com.example.android.common.logger.Log;
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/**
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 * Toggles the user's login status via a login menu option, and enables/disables the cloud storage
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 * content provider.
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 */
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public class MyCloudFragment extends Fragment {
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    private static final String TAG = "MyCloudFragment";
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    private static final String AUTHORITY = "com.example.android.storageprovider.documents";
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    private boolean mLoggedIn = false;
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    @Override
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    public void onCreate(Bundle savedInstanceState) {
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        super.onCreate(savedInstanceState);
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        mLoggedIn = readLoginValue();
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        setHasOptionsMenu(true);
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    }
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    @Override
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    public void onPrepareOptionsMenu(Menu menu) {
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        super.onPrepareOptionsMenu(menu);
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        MenuItem item = menu.findItem(R.id.sample_action);
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        item.setTitle(mLoggedIn ? R.string.log_out : R.string.log_in);
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    }
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    @Override
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    public boolean onOptionsItemSelected(MenuItem item) {
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        if (item.getItemId() == R.id.sample_action) {
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            toggleLogin();
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            item.setTitle(mLoggedIn ? R.string.log_out : R.string.log_in);
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            // Notify the system that the status of our roots has changed.  This will trigger
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            // a call to MyCloudProvider.queryRoots() and force a refresh of the system
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            // picker UI.  It's important to call this or stale results may persist.
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            getActivity().getContentResolver().notifyChange(DocumentsContract.buildRootsUri
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                    (AUTHORITY), null, false);
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        }
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        return true;
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    }
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    /**
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     * Dummy function to change the user's authorization status.
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     */
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    private void toggleLogin() {
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        // Replace this with your standard method of authentication to determine if your app
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        // should make the user's documents available.
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        mLoggedIn = !mLoggedIn;
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        writeLoginValue(mLoggedIn);
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        Log.i(TAG, getString(mLoggedIn ? R.string.logged_in_info : R.string.logged_out_info));
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    }
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    /**
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     * Dummy function to save whether the user is logged in.
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     */
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    private void writeLoginValue(boolean loggedIn) {
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        final SharedPreferences sharedPreferences =
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                getActivity().getSharedPreferences(getString(R.string.app_name),
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                        getActivity().MODE_PRIVATE);
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        sharedPreferences.edit().putBoolean(getString(R.string.key_logged_in), loggedIn).commit();
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    }
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    /**
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     * Dummy function to determine whether the user is logged in.
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     */
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    private boolean readLoginValue() {
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        final SharedPreferences sharedPreferences =
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                getActivity().getSharedPreferences(getString(R.string.app_name),
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                        getActivity().MODE_PRIVATE);
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        return sharedPreferences.getBoolean(getString(R.string.key_logged_in), false);
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    }
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}
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