Java tutorial
// ------------------------------------------------------------------------------ // Copyright (c) 2015 Microsoft Corporation // // Permission is hereby granted, free of charge, to any person obtaining a copy // of this software and associated documentation files (the "Software"), to deal // in the Software without restriction, including without limitation the rights // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell // copies of the Software, and to permit persons to whom the Software is // furnished to do so, subject to the following conditions: // // The above copyright notice and this permission notice shall be included in // all copies or substantial portions of the Software. // // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN // THE SOFTWARE. // ------------------------------------------------------------------------------ package com.microsoft.onedrive.apiexplorer; import com.google.gson.JsonElement; import com.onedrive.sdk.concurrency.ICallback; import com.onedrive.sdk.extensions.IDeltaCollectionPage; import com.onedrive.sdk.extensions.Item; import org.json.JSONException; import org.json.JSONObject; import android.app.Activity; import android.app.Fragment; import android.content.Context; import android.content.SharedPreferences; import android.os.Bundle; import android.text.method.ScrollingMovementMethod; import android.util.Log; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.TextView; import android.widget.Toast; import java.util.concurrent.atomic.AtomicInteger; /** * Shows the changes of the decedents of an item */ public class DeltaFragment extends Fragment { /** * The argument for the item id */ private static final String ARG_ITEM_ID = "itemId"; /** * The argument for the item name */ private static final String ARG_ITEM_NAME_ID = "itemName"; /** * The max number of pages to retrieve */ private static final int MAX_PAGE_COUNT = 5; /** * The number of pages that have been downloaded */ private final AtomicInteger mCurrentPagesCount = new AtomicInteger(0); /** * The item id */ private String mItemId; /** * The item name */ private String mItemName; /** * Create a new instance of ItemFragment * @param item the item * @return The fragment */ static DeltaFragment newInstance(final Item item) { final DeltaFragment fragment = new DeltaFragment(); final Bundle args = new Bundle(); args.putString(ARG_ITEM_ID, item.id); args.putString(ARG_ITEM_NAME_ID, item.name); fragment.setArguments(args); return fragment; } @Override public void onCreate(final Bundle savedInstanceState) { super.onCreate(savedInstanceState); final BaseApplication app = (BaseApplication) getActivity().getApplication(); if (app.goToWifiSettingsIfDisconnected()) { return; } if (getArguments() != null) { mItemId = getArguments().getString(ARG_ITEM_ID); mItemName = getArguments().getString(ARG_ITEM_NAME_ID); } if (getView() != null) { getView().findViewById(android.R.id.progress).setVisibility(View.VISIBLE); getView().findViewById(R.id.json).setVisibility(View.INVISIBLE); } setHasOptionsMenu(true); } @Override public View onCreateView(final LayoutInflater inflater, final ViewGroup container, final Bundle savedInstanceState) { final View view = inflater.inflate(R.layout.fragment_json_view, container, false); ((TextView) view.findViewById(R.id.json)).setMovementMethod(new ScrollingMovementMethod()); getActivity().setTitle(getString(R.string.delta_title, mItemName)); refresh(); return view; } /** * Refresh the UI */ private void refresh() { if (getView() != null) { getView().findViewById(android.R.id.progress).setVisibility(View.VISIBLE); final TextView jsonView = (TextView) getView().findViewById(R.id.json); jsonView.setVisibility(View.INVISIBLE); jsonView.setText(""); mCurrentPagesCount.set(0); } final String deltaToken = getDeltaInfo().getString(mItemId, null); final Activity activity = getActivity(); ((BaseApplication) activity.getApplication()).getOneDriveClient().getDrive().getItems(mItemId) .getDelta(deltaToken).buildRequest().select("id,name,deleted").get(pageHandler()); } /** * Create a handler for downloaded pages * @return The callback to handle a fresh DeltaPage */ private ICallback<IDeltaCollectionPage> pageHandler() { return new DefaultCallback<IDeltaCollectionPage>(getActivity()) { @Override public void success(final IDeltaCollectionPage page) { final View view = getView(); if (view == null) { return; } final View viewById = view.findViewById(R.id.json); if (viewById == null) { return; } if (mCurrentPagesCount.incrementAndGet() == MAX_PAGE_COUNT) { Toast.makeText(getActivity(), R.string.max_pages_downloaded, Toast.LENGTH_LONG).show(); return; } final TextView jsonView = (TextView) viewById; final CharSequence originalText = jsonView.getText(); final StringBuilder sb = new StringBuilder(originalText); for (final Item i : page.getCurrentPage()) { try { final int indentSpaces = 3; sb.append(new JSONObject(i.getRawObject().toString()).toString(indentSpaces)); } catch (final JSONException ignored) { Log.e(getClass().getName(), "Unable to parse the response body to json"); } sb.append("\n"); } if (page.getCurrentPage().size() == 0) { sb.append(getString(R.string.empty_delta)); } jsonView.setText(sb.toString()); view.findViewById(android.R.id.progress).setVisibility(View.INVISIBLE); jsonView.setVisibility(View.VISIBLE); if (page.getNextPage() != null) { page.getNextPage().buildRequest().get(pageHandler()); } final JsonElement deltaToken = page.getRawObject().get("@delta.token"); if (deltaToken != null) { getDeltaInfo().edit().putString(mItemId, deltaToken.getAsString()).commit(); } } }; } @Override public void onCreateOptionsMenu(final Menu menu, final MenuInflater inflater) { super.onCreateOptionsMenu(menu, inflater); menu.clear(); inflater.inflate(R.menu.menu_delta_fragment, menu); } @Override public boolean onOptionsItemSelected(final MenuItem item) { switch (item.getItemId()) { case R.id.action_refresh: refresh(); return true; case R.id.reset_token: resetToken(); return true; case R.id.reset_all_tokens: resetAllTokens(); return true; default: return false; } } /** * Reset the delta token for the currently in view item */ private void resetToken() { getDeltaInfo().edit().putString(mItemId, null).commit(); Toast.makeText(getActivity(), getString(R.string.cleared_saved_delta_token, mItemName), Toast.LENGTH_LONG) .show(); refresh(); } /** * Reset all delta tokens */ private void resetAllTokens() { getDeltaInfo().edit().clear().commit(); Toast.makeText(getActivity(), getString(R.string.cleared_saved_delta_tokens), Toast.LENGTH_LONG).show(); refresh(); } /** * Get the view delta preferences * @return The preferences */ private SharedPreferences getDeltaInfo() { return getActivity().getSharedPreferences("delta", Context.MODE_PRIVATE); } }