ChangeActivity.java

package com.mzeat.ui;

import java.util.ArrayList;

import com.handmark.pulltorefresh.library.PullToRefreshBase;
import com.handmark.pulltorefresh.library.PullToRefreshListView;
import com.mzeat.MzeatApplication;
import com.mzeat.R;
import com.mzeat.api.MzeatService;
import com.mzeat.db.ChangeDb;
import com.mzeat.db.PrivilegeItemDb;
import com.mzeat.model.Change;
import com.mzeat.model.ChangeReturn;
import com.mzeat.model.Page;
import com.mzeat.model.Privilege;
import com.mzeat.model.PrivilegeItem;
import com.mzeat.model.Shopping;
import com.mzeat.task.GenericTask;
import com.mzeat.task.TaskAdapter;
import com.mzeat.task.TaskParams;
import com.mzeat.task.TaskResult;
import com.mzeat.ui.adapter.ChangeListAdapter;
import com.mzeat.ui.adapter.PrivilegeAdapter;
import com.mzeat.util.CheckNetworkConnection;
import com.mzeat.util.ConnectionChangeReceiver;
import com.mzeat.util.ShowToast;

import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.util.Log;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.AdapterView.OnItemClickListener;

/**
 * 兑换
 * @author Administrator
 *
 */
public class ChangeActivity extends BaseActivity {

	private NetworkChange networkChange;
	private ChangeListAdapter mAdapter;

	private LoadDataTask mLoadDataTask;

	private int load_result = 0;
	public int load_fromnetwork_success = 1;
	public int load_fromdb_success = 2;

	private boolean save_local = false;

	private ChangeDb mDb;
	public final static String SER_KEY = "change";
	private TextView tv_title;
	private PullToRefreshListView mListView;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_change);
		initView();
		setViewData();
	}

	private void initView() {
		tv_title = (TextView) findViewById(R.id.tv_title);
		findViewById(R.id.btn_back).setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				finish();
			}
		});

		mListView = (PullToRefreshListView) findViewById(R.id.change_list);
		mListView.setOnRefreshListener(RefreshListener);
		mListView.setOnItemClickListener(mItemClickListener);
		mAdapter = new ChangeListAdapter(this);
	}

	private void setViewData() {
		tv_title.setText(R.string.changestore);
	}

	ArrayList<Change> mChange = new ArrayList<Change>();
	private TaskAdapter mTaskListener = new TaskAdapter() {
		// ProgressDialog pg;

		@Override
		public String getName() {
			// TODO Auto-generated method stub
			return null;
		}

		public void onPreExecute(GenericTask task) {
			// TODO 任务开始执行，可提供进度条展现
			mListView.setRefreshing(true);
			mListView.setDisableScrollingWhileRefreshing(true);

		}

		public void onPostExecute(GenericTask task, TaskResult result) {

			mListView.onRefreshComplete();
			// Page mPage = new Page();
			// TODO 判断TaskReult的返回值是否ok
			if (result == TaskResult.OK) {

				if (page == 1) {

					mChange = mLoadDataTask.getChange();
					mAdapter.setDataList(mChange);
					mAdapter.notifyDataSetChanged();
					mListView.setAdapter(mAdapter);
					load_result = load_fromnetwork_success;

					if (!save_local) {
						mDb = new ChangeDb(ChangeActivity.this);
						mDb.add(mChange);
						mDb.closeDB();
					}

					page = page + 1;

					mLoadDataTask = null;
				} else {

					page = page + 1;

					mChange.addAll(mLoadDataTask.getChange());
					mAdapter.notifyDataSetChanged();
					mLoadDataTask = null;
				}

				// ShowToast.showGetSuccess(FoodActivity.this);
			} else if (result == TaskResult.FAILED) {
				mLoadDataTask = null;
				ShowToast.showGetFaile(ChangeActivity.this);

			} else if (result == TaskResult.IO_ERROR) {
				mLoadDataTask = null;
				ShowToast.showError(ChangeActivity.this);
			} else if (result == TaskResult.NO_MORE_DATA) {
				mLoadDataTask = null;
				ShowToast.showNomoredata(ChangeActivity.this);
			}

		}

		public void onProgressUpdate(GenericTask task, Object param) {
			// TODO 如果是下载，可在此显示下载进度

		}

		public void onCancelled(GenericTask task) {
			// TODO 后台任务被取消的事件回调，适当情况下可以提示用户，如“下载已取消”

			mListView.onRefreshComplete();

		}
	};

	private int page = 1;
	private ArrayList<Change> change = new ArrayList<Change>();
	private Page mPage = null;

	
	private class LoadDataTask extends GenericTask {

		@Override
		protected TaskResult _doInBackground(TaskParams... params) {
			// TODO Auto-generated method stub
			ChangeReturn changeReturn = new ChangeReturn();
			if (mPage == null) {
				changeReturn = MzeatApplication
						.getInstance()
						.getService()
						.getChangeReturn(String.valueOf(page));
				int code = Integer.valueOf(changeReturn.getOpen());
				if (code == MzeatService.RESULT_OK) {
					change = (ArrayList<Change>) changeReturn
							.getItem();
					// Log.e("name", privilegeItem.get(0).getAddress());
					mPage = (Page) changeReturn.getPage();
					return TaskResult.OK;
				} else if (code == MzeatService.RESULT_FAILE) {
					return TaskResult.FAILED;
				} else {
					return TaskResult.IO_ERROR;
				}
			} else {

				if (page <= Integer.valueOf(mPage.getPage_total())) {
					changeReturn = MzeatApplication
							.getInstance()
							.getService()
							.getChangeReturn(String.valueOf(page));
					int code = Integer.valueOf(changeReturn.getOpen());
					if (code == MzeatService.RESULT_OK) {
						change = (ArrayList<Change>) changeReturn
								.getItem();
						// Log.e("name", privilegeItem.get(0).getAddress());
						mPage = (Page) changeReturn.getPage();
						return TaskResult.OK;
					} else if (code == MzeatService.RESULT_FAILE) {
						return TaskResult.FAILED;
					} else {
						return TaskResult.IO_ERROR;
					}
				} else {
					return TaskResult.NO_MORE_DATA;
				}

			}

		}

		@Override
		protected void onCancelled() {
			// TODO Auto-generated method stub
			super.onCancelled();
		}

		private ArrayList<Change> getChange() {
			return change;
		}
	}

	private void loaddata() {

		/**
		 * 重要！！需要判断当前任务是否正在运行，否则重复执行会出错，典型的场景就是用户点击登录按钮多次
		 */

		if (null != mLoadDataTask
				&& mLoadDataTask.getStatus() == GenericTask.Status.RUNNING)
			return;

		mLoadDataTask = new LoadDataTask();
		mLoadDataTask.setListener(mTaskListener);
		try {
			mLoadDataTask.execute();
		} catch (Exception e) {
			// TODO: handle exception
			e.printStackTrace();
		}

	}

	private PullToRefreshBase.OnRefreshListener<ListView> RefreshListener = new PullToRefreshBase.OnRefreshListener<ListView>() {

		@Override
		public void onRefresh(PullToRefreshBase<ListView> refreshView) {

			if (CheckNetworkConnection
					.checkNetworkConnection(ChangeActivity.this)) {
				
					
					loaddata();

				

			} else {
				ShowToast.showToastShort(ChangeActivity.this,
						R.string.your_network_has_disconnected);
				mListView.onRefreshComplete();
			}

		}

	};

	public class NetworkChange extends ConnectionChangeReceiver {

		@Override
		public void onReceive(Context context, Intent intent) {
			// TODO Auto-generated method stub
			super.onReceive(context, intent);
			if (super.success == true) {

				if (load_result != load_fromnetwork_success) {
					
						getOldData();
						loaddata();


					super.success = false;
				}

			} else {
				if (load_result == 0) {
					 getOldData();
				}
			}
		}

	}

	private void getOldData() { 
		mDb = new ChangeDb(this);
		mChange = mDb.getChange();
		mDb.closeDB();
		if (mChange.size() != 0) {
			mAdapter.setDataList(mChange);
			mListView.setAdapter(mAdapter);
			load_result = load_fromdb_success;
		}
	}
	ListView.OnItemClickListener mItemClickListener = new OnItemClickListener() {

		@Override
		public void onItemClick(AdapterView<?> parent, View view, int position,
				long id) {
			// TODO Auto-generated method stub
					Intent intent = new Intent(ChangeActivity.this,
							ChangeDetailActivity.class);
					Change mItem = mChange.get(position - 1);
					Bundle mBundle = new Bundle();
					mBundle.putSerializable(SER_KEY, mItem);
					intent.putExtras(mBundle);
					startActivity(intent);


		}

	};
	@Override
	protected void onDestroy() {
		// TODO Auto-generated method stub
		// Log.e("onDestroy()", "onDestroy()");
		if (null != mLoadDataTask
				&& mLoadDataTask.getStatus() == LoadDataTask.Status.RUNNING) {
			mLoadDataTask.cancel(true);
		}
		super.onDestroy();
	}

	@Override
	protected void onResume() {
		// TODO Auto-generated method stub
		super.onResume();

		networkChange = new NetworkChange();
		IntentFilter filter = new IntentFilter();
		filter.addAction("android.net.conn.CONNECTIVITY_CHANGE");
		registerReceiver(networkChange, filter);

	}

	@Override
	protected void onPause() {
		// TODO Auto-generated method stub
		super.onPause();
		try {
			unregisterReceiver(networkChange);
		} catch (Exception e) {
			// TODO: handle exception
			e.printStackTrace();
		}

	}

	public boolean onKeyDown(int keyCode, KeyEvent event) {// 捕捉返回键
		if (keyCode == KeyEvent.KEYCODE_BACK) {
			if (null != mLoadDataTask) {
				mLoadDataTask.cancel(true);
				mLoadDataTask = null;
				mListView.onRefreshComplete();
				return true;
			}

		}
		if (keyCode == KeyEvent.KEYCODE_BACK) {

			finish();
		}

		return super.onKeyDown(keyCode, event);
	}
}