Java tutorial
/** * Copyright 2010-present Facebook. * * 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.facebook.android; import android.app.Activity; import android.app.AlertDialog; import android.content.DialogInterface; import android.os.Bundle; import android.os.Handler; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.*; import android.widget.AdapterView.OnItemClickListener; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; public class FriendsList extends Activity implements OnItemClickListener { private Handler mHandler; protected ListView friendsList; protected static JSONArray jsonArray; protected String graph_or_fql; /* * Layout the friends' list */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); mHandler = new Handler(); setContentView(R.layout.friends_list); Bundle extras = getIntent().getExtras(); String apiResponse = extras.getString("API_RESPONSE"); graph_or_fql = extras.getString("METHOD"); try { if (graph_or_fql.equals("graph")) { jsonArray = new JSONObject(apiResponse).getJSONArray("data"); } else { jsonArray = new JSONArray(apiResponse); } } catch (JSONException e) { showToast("Error: " + e.getMessage()); return; } friendsList = (ListView) findViewById(R.id.friends_list); friendsList.setOnItemClickListener(this); friendsList.setAdapter(new FriendListAdapter(this)); showToast(getString(R.string.can_post_on_wall)); } /* * Clicking on a friend should popup a dialog for user to post on friend's * wall. */ @Override @SuppressWarnings("deprecation") public void onItemClick(AdapterView<?> arg0, View v, int position, long arg3) { try { final long friendId; if (graph_or_fql.equals("graph")) { friendId = jsonArray.getJSONObject(position).getLong("id"); } else { friendId = jsonArray.getJSONObject(position).getLong("uid"); } String name = jsonArray.getJSONObject(position).getString("name"); new AlertDialog.Builder(this).setTitle(R.string.post_on_wall_title) .setMessage(String.format(getString(R.string.post_on_wall), name)) .setPositiveButton(R.string.yes, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { Bundle params = new Bundle(); /* * Source Tag: friend_wall_tag To write on a friend's wall, * provide friend's UID in the 'to' parameter. * More info on feed dialog: * https://developers.facebook.com/docs/reference/dialogs/feed/ */ params.putString("to", String.valueOf(friendId)); params.putString("caption", getString(R.string.app_name)); params.putString("description", getString(R.string.app_desc)); params.putString("picture", Utility.HACK_ICON_URL); params.putString("name", getString(R.string.app_action)); Utility.mFacebook.dialog(FriendsList.this, "feed", params, new PostDialogListener()); } }).setNegativeButton(R.string.no, null).show(); } catch (JSONException e) { showToast("Error: " + e.getMessage()); } } /* * Callback after the message has been posted on friend's wall. */ public class PostDialogListener extends BaseDialogListener { @Override public void onComplete(Bundle values) { final String postId = values.getString("post_id"); if (postId != null) { showToast("Message posted on the wall."); } else { showToast("No message posted on the wall."); } } } public void showToast(final String msg) { mHandler.post(new Runnable() { @Override public void run() { Toast toast = Toast.makeText(FriendsList.this, msg, Toast.LENGTH_LONG); toast.show(); } }); } /** * Definition of the list adapter */ public class FriendListAdapter extends BaseAdapter { private LayoutInflater mInflater; FriendsList friendsList; public FriendListAdapter(FriendsList friendsList) { this.friendsList = friendsList; if (Utility.model == null) { Utility.model = new FriendsGetProfilePics(); } Utility.model.setListener(this); mInflater = LayoutInflater.from(friendsList.getBaseContext()); } @Override public int getCount() { return jsonArray.length(); } @Override public Object getItem(int position) { return null; } @Override public long getItemId(int position) { return 0; } @Override public View getView(int position, View convertView, ViewGroup parent) { JSONObject jsonObject = null; try { jsonObject = jsonArray.getJSONObject(position); } catch (JSONException e1) { e1.printStackTrace(); } View hView = convertView; if (convertView == null) { hView = mInflater.inflate(R.layout.friend_item, null); ViewHolder holder = new ViewHolder(); holder.profile_pic = (ImageView) hView.findViewById(R.id.profile_pic); holder.name = (TextView) hView.findViewById(R.id.name); holder.info = (TextView) hView.findViewById(R.id.info); hView.setTag(holder); } ViewHolder holder = (ViewHolder) hView.getTag(); try { if (graph_or_fql.equals("graph")) { holder.profile_pic.setImageBitmap( Utility.model.getImage(jsonObject.getString("id"), jsonObject.getString("picture"))); } else { holder.profile_pic.setImageBitmap(Utility.model.getImage(jsonObject.getString("uid"), jsonObject.getString("pic_square"))); } } catch (JSONException e) { holder.name.setText(""); } try { holder.name.setText(jsonObject.getString("name")); } catch (JSONException e) { holder.name.setText(""); } try { if (graph_or_fql.equals("graph")) { holder.info.setText(jsonObject.getJSONObject("location").getString("name")); } else { JSONObject location = jsonObject.getJSONObject("current_location"); holder.info.setText(location.getString("city") + ", " + location.getString("state")); } } catch (JSONException e) { holder.info.setText(""); } return hView; } } class ViewHolder { ImageView profile_pic; TextView name; TextView info; } }