Java tutorial
package com.eutectoid.dosomething.usersettings; /** * Created by robbt on 3/26/16. */ /** * Copyright (c) 2014-present, Facebook, Inc. All rights reserved. * * You are hereby granted a non-exclusive, worldwide, royalty-free license to use, * copy, modify, and distribute this software in source code or binary form for use * in connection with the web services and APIs provided by Facebook. * * As with any software that integrates with the Facebook platform, your use of * this software is subject to the Facebook Developer Principles and Policies * [http://developers.facebook.com/policy/]. This copyright 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. */ import android.content.Intent; import android.graphics.Bitmap; import android.graphics.drawable.BitmapDrawable; import android.graphics.drawable.Drawable; import android.net.Uri; import android.os.Bundle; import android.support.v4.app.Fragment; import android.text.TextUtils; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.TextView; import com.facebook.AccessToken; import com.facebook.AccessTokenTracker; import com.facebook.CallbackManager; import com.facebook.GraphRequest; import com.facebook.GraphResponse; import com.facebook.internal.ImageDownloader; import com.facebook.internal.ImageRequest; import com.facebook.internal.ImageResponse; import com.eutectoid.dosomething.R; import com.facebook.login.widget.LoginButton; import org.json.JSONObject; /** * A Fragment that displays a Login/Logout button as well as the user's * profile picture and name when logged in. */ public final class UserSettingsFragment extends Fragment { private static final String NAME = "name"; private static final String ID = "id"; private static final String PICTURE = "picture"; private static final String FIELDS = "fields"; private static final String REQUEST_FIELDS = TextUtils.join(",", new String[] { ID, NAME, PICTURE }); private AccessTokenTracker accessTokenTracker; private CallbackManager callbackManager; private LoginButton loginButton; private TextView connectedStateLabel; private JSONObject user; private Drawable userProfilePic; private String userProfilePicID; @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); accessTokenTracker = new AccessTokenTracker() { @Override protected void onCurrentAccessTokenChanged(AccessToken oldAccessToken, AccessToken currentAccessToken) { fetchUserInfo(); updateUI(); } }; callbackManager = CallbackManager.Factory.create(); } @Override public void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); callbackManager.onActivityResult(requestCode, resultCode, data); } @Override public void onDestroy() { super.onDestroy(); accessTokenTracker.stopTracking(); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.usersettings_fragment, container, false); loginButton = (LoginButton) view.findViewById(R.id.usersettings_fragment_login_button); loginButton.setFragment(this); connectedStateLabel = (TextView) view.findViewById(R.id.usersettings_fragment_profile_name); // if no background is set for some reason, then default to Facebook blue if (view.getBackground() == null) { view.setBackgroundColor(getResources().getColor(R.color.com_facebook_blue)); } else { view.getBackground().setDither(true); } return view; } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setRetainInstance(true); } /** * @throws com.facebook.FacebookException if errors occur during the loading of user information */ @Override public void onResume() { super.onResume(); fetchUserInfo(); updateUI(); } private void fetchUserInfo() { final AccessToken accessToken = AccessToken.getCurrentAccessToken(); if (accessToken != null) { GraphRequest request = GraphRequest.newMeRequest(accessToken, new GraphRequest.GraphJSONObjectCallback() { @Override public void onCompleted(JSONObject me, GraphResponse response) { user = me; updateUI(); } }); Bundle parameters = new Bundle(); parameters.putString(FIELDS, REQUEST_FIELDS); request.setParameters(parameters); GraphRequest.executeBatchAsync(request); } else { user = null; } } private void updateUI() { if (!isAdded()) { return; } if (AccessToken.getCurrentAccessToken() != null) { connectedStateLabel .setTextColor(getResources().getColor(R.color.usersettings_fragment_connected_text_color)); connectedStateLabel.setShadowLayer(1f, 0f, -1f, getResources().getColor(R.color.usersettings_fragment_connected_shadow_color)); if (user != null) { ImageRequest request = getImageRequest(); if (request != null) { Uri requestUri = request.getImageUri(); // Do we already have the right picture? If so, leave it alone. if (!requestUri.equals(connectedStateLabel.getTag())) { if (user.optString("id").equals(userProfilePicID)) { connectedStateLabel.setCompoundDrawables(null, userProfilePic, null, null); connectedStateLabel.setTag(requestUri); } else { ImageDownloader.downloadAsync(request); } } } connectedStateLabel.setText(user.optString("name")); } else { connectedStateLabel.setText(getResources().getString(R.string.usersettings_fragment_logged_in)); Drawable noProfilePic = getResources().getDrawable(R.drawable.profile_default_icon); noProfilePic.setBounds(0, 0, getResources().getDimensionPixelSize(R.dimen.usersettings_fragment_profile_picture_width), getResources().getDimensionPixelSize(R.dimen.usersettings_fragment_profile_picture_height)); connectedStateLabel.setCompoundDrawables(null, noProfilePic, null, null); } } else { int textColor = getResources().getColor(R.color.usersettings_fragment_not_connected_text_color); connectedStateLabel.setTextColor(textColor); connectedStateLabel.setShadowLayer(0f, 0f, 0f, textColor); connectedStateLabel.setText(getResources().getString(R.string.usersettings_fragment_not_logged_in)); connectedStateLabel.setCompoundDrawables(null, null, null, null); connectedStateLabel.setTag(null); } } private ImageRequest getImageRequest() { ImageRequest request = null; ImageRequest.Builder requestBuilder = new ImageRequest.Builder(getActivity(), ImageRequest.getProfilePictureUri(user.optString("id"), getResources().getDimensionPixelSize(R.dimen.usersettings_fragment_profile_picture_width), getResources() .getDimensionPixelSize(R.dimen.usersettings_fragment_profile_picture_height))); request = requestBuilder.setCallerTag(this).setCallback(new ImageRequest.Callback() { @Override public void onCompleted(ImageResponse response) { processImageResponse(user.optString("id"), response); } }).build(); return request; } private void processImageResponse(String id, ImageResponse response) { if (response != null) { Bitmap bitmap = response.getBitmap(); if (bitmap != null) { BitmapDrawable drawable = new BitmapDrawable(UserSettingsFragment.this.getResources(), bitmap); drawable.setBounds(0, 0, getResources().getDimensionPixelSize(R.dimen.usersettings_fragment_profile_picture_width), getResources().getDimensionPixelSize(R.dimen.usersettings_fragment_profile_picture_height)); userProfilePic = drawable; userProfilePicID = id; connectedStateLabel.setCompoundDrawables(null, drawable, null, null); connectedStateLabel.setTag(response.getRequest().getImageUri()); } } } }