com.eincs.athens.android.OlympusFeedActivity.java Source code

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Here is the source code for com.eincs.athens.android.OlympusFeedActivity.java

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/*
 * Copyright 2012 Athens Team
 * 
 * This file to you 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.eincs.athens.android;

import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;
import java.util.TreeMap;

import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.app.ListActivity;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.TextView;
import android.widget.Toast;
import com.eincs.athens.android.R;
import com.eincs.athens.android.data.Post;
import com.eincs.athens.android.utils.DefaultAsyncTask;
import com.eincs.athens.android.utils.JSONResponseHandler;
import com.eincs.athens.android.utils.ProgressDialogs;
import com.eincs.athens.android.utils.StringUtils;

public class OlympusFeedActivity extends ListActivity implements View.OnClickListener {

    private Context mContext;
    private TreeMap<Integer, Post> mData;
    private ArrayList<Post> mDataArray;
    private TextView mBtnWrite;
    private PostAdapter mAdapter;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_feed);

        mContext = this;
        mBtnWrite = (TextView) findViewById(R.id.btn_write);
        mData = new TreeMap<Integer, Post>(new Comparator<Integer>() {

            @Override
            public int compare(Integer object1, Integer object2) {
                return object2 - object1;
            }
        });
        mDataArray = new ArrayList<Post>();
        mAdapter = new PostAdapter(this, R.layout.item_post, mDataArray);
        setListAdapter(mAdapter);

        mBtnWrite.setOnClickListener(this);
        getTimeline(null, null);
    }

    @Override
    protected void onResume() {
        super.onResume();
        getTimeline(null, null);
    }

    private void getTimeline(final String after, final String before) {

        final HttpClient httpClient = new DefaultHttpClient();
        new DefaultAsyncTask<JSONObject>(ProgressDialogs.createDialog(this)) {

            @Override
            protected JSONObject doInBackground(Object... params) {
                Uri uri = Uri.parse(OlympusConst.SERVER_HOST + OlympusConst.PATH_TIMELINE);
                Uri.Builder builder = uri.buildUpon();

                if (!StringUtils.isEmptyOrNull(after)) {
                    builder.appendQueryParameter("after", after);
                }

                if (!StringUtils.isEmptyOrNull(after)) {
                    builder.appendQueryParameter("before", before);
                }

                HttpGet httpGet = new HttpGet(uri.toString());

                try {
                    JSONObject result = httpClient.execute(httpGet, new JSONResponseHandler());
                    return result;

                } catch (Exception e) {
                    Log.e("Olympus", e.getMessage(), e);
                    return null;
                }
            }

            protected void onPostExecute(JSONObject result) {
                super.onPostExecute(result);

                if (result == null) {
                    Toast.makeText(mContext, "error", Toast.LENGTH_SHORT).show();

                } else if (result.has("error")) {
                    try {
                        Toast.makeText(mContext, result.getString("error"), Toast.LENGTH_SHORT).show();
                    } catch (JSONException e) {
                        e.printStackTrace();
                    }
                } else {
                    try {
                        JSONArray jsonList = result.getJSONArray("result");
                        List<Post> postList = Post.createList(jsonList);

                        mData.clear();
                        for (Post post : postList) {
                            mData.put(post.getId(), post);
                        }

                        mDataArray.clear();
                        for (Integer integer : mData.keySet()) {
                            mDataArray.add(mData.get(integer));
                        }
                        mAdapter.notifyDataSetChanged();

                    } catch (JSONException e) {
                        e.printStackTrace();
                    }
                }
            };
        }.execute();
    }

    public void onClick(View v) {
        if (v.getId() == R.id.btn_write) {
            Intent intent = new Intent(this, OlympusWriteActivity.class);
            startActivity(intent);
        }
    }
}