【Android基礎知識】【android多線程handler】

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handler機制不需要明白太多，我認為可以參照例子來實現，每次使用的時候就用一下例子。

既有線程，又有mhandler對接收到的訊息的處理。

package com.hengtiansoft.sportnow.news.ui;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import android.app.Activity;import android.app.ProgressDialog;import android.os.AsyncTask;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.text.format.DateUtils;import android.view.View;import android.widget.Button;import android.widget.ListView;import android.widget.Toast;import com.hengtiansoft.sportnow.R;import com.handmark.pulltorefresh.library.PullToRefreshBase;import com.handmark.pulltorefresh.library.PullToRefreshBase.Mode;import com.handmark.pulltorefresh.library.PullToRefreshListView;import com.handmark.pulltorefresh.library.PullToRefreshBase.OnRefreshListener;import com.handmark.pulltorefresh.library.PullToRefreshBase.Mode;import com.handmark.pulltorefresh.library.PullToRefreshListView;import com.hengtiansoft.sportnow.news.adapter.MainListViewAdapter;import com.hengtiansoft.sportnow.news.app.NewsAppContext;import com.hengtiansoft.sportnow.news.app.NewsAppException;import com.hengtiansoft.sportnow.news.bean.News;import com.hengtiansoft.sportnow.news.bean.NewsList;import com.hengtiansoft.sportnow.news.common.UIHelper;public class NewsActivity extends Activity {    private PullToRefreshListView listview;    private List<News> newsList;    private NewsAppContext appContext;// 全域Context    private MainListViewAdapter listViewAdapter;    private ProgressDialog selectorDialog;    private Button bt_news, bt_forum, bt_cartype, bt_favour, bt_more;    @Override    protected void onCreate(Bundle savedInstanceState) {        // TODO Auto-generated method stub        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_news);        appContext = (NewsAppContext) getApplication();        // 網路連接判斷        if (!appContext.isNetworkConnected())            UIHelper.ToastMessage(this, R.string.network_not_connected);        initData();    }        //變數    Handler mHandler = new Handler() {        public void handleMessage(Message msg) {            selectorDialog.cancel();            if (msg.what == 1) {                newsList = (List<News>) msg.obj;                listViewAdapter = new MainListViewAdapter(NewsActivity.this,                        newsList);                listview.setAdapter(listViewAdapter);            } else if (msg.what == -1) {                UIHelper.ToastMessage(NewsActivity.this, "沒有資料");            } else if (msg.what == -2) {                UIHelper.ToastMessage(NewsActivity.this,                        R.string.xml_parser_failed);            }        }    };    private void initData() {        selectorDialog.show();        new Thread() {            public void run() {                Message msg = new Message();                boolean isRefresh = false;                try {                    NewsList list = appContext.getNewsList();                    if (list.getNewsCount() > 0) {                        msg.what = 1;                        msg.obj = list.getNewslist();                        appContext.saveObject(list, "newslist_");                    } else {                        msg.what = -1;                    }                } catch (NewsAppException e) {                    e.printStackTrace();                    msg.what = -2;                    msg.obj = e;                }                mHandler.sendMessage(msg);            }        }.start();    }}

 

【Android基礎知識】【android多線程handler】