复杂listView

最新推荐文章于 2021-05-26 05:23:10 发布

翻译最新推荐文章于 2021-05-26 05:23:10 发布 · 334 阅读

1.Fragment的复用

	
		// 创建一个存放标题的集合
		titleList = new ArrayList();
		// 创建一个存放fragment的及集合
		pageList = new ArrayList();
		for (int i = 0; i < title.length; i++) {
			titleList.add(title[i]);
			// //将url传进fragment
			pageList.add(PageFragment.getInstance(Url.getUrl().get(i)));
		}

2.判断是否网络

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;

/**
 * 网路工具
 * 
 * @author 大金
 * 
 */
public class MyHttpUtils {
	// 判断是否有网
	public static boolean hasNet(Context context) {
		ConnectivityManager manager = (ConnectivityManager) context
				.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo networkInfo = manager.getActiveNetworkInfo();
        if(networkInfo!=null){
        	return networkInfo.isAvailable();
        }
        return false;
	}
	//获取网络类型
	public static int netType(Context context){
		ConnectivityManager manager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
		NetworkInfo networkInfo = manager.getActiveNetworkInfo();
		return networkInfo.getSubtype();
	}

}

3.fragment的具体用法

import java.text.SimpleDateFormat;
import java.util.ArrayList;

import android.content.ContentValues;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.TextView;
import android.widget.Toast;

import com.bawei.jinri20161108.MyWebView;
import com.bawei.jinri20161108.R;
import com.bawei.jinri20161108_adapter.MyXlistAdapter;
import com.bawei.jinri20161108_bean.Data;
import com.bawei.jinri20161108_bean.News;
import com.bawei.jinri20161108_myhelper.MyHelper;
import com.bawei.jinri20161108_util.JsonUtils;
import com.bawei.jinri20161108_util.MyHttpUtils;
import com.bawei.jinri20161108_views.XListView;
import com.bawei.jinri20161108_views.XListView.IXListViewListener;
import com.lidroid.xutils.HttpUtils;
import com.lidroid.xutils.exception.HttpException;
import com.lidroid.xutils.http.ResponseInfo;
import com.lidroid.xutils.http.callback.RequestCallBack;
import com.lidroid.xutils.http.client.HttpRequest.HttpMethod;

public class PageFragment extends Fragment implements IXListViewListener {
	private String tag = "PageFragment--》";
	private XListView xlist;
	private MyXlistAdapter adapter;
	private ArrayList arrayList;
	private final int ERROR = 0;
	private final int ACCESS = 1;
	private final int REFESH = 2;
	private final int REFESH2 = 3;
	private ArrayList datas;
	ArrayList datas_tmp = new ArrayList();
	private Handler handler = new Handler() {

		public void handleMessage(android.os.Message msg) {
			int num1 = msg.what;
			datas = (ArrayList) msg.obj;

			switch (num1) {
			case ERROR:
				Toast.makeText(getActivity(), "请检查网络???/////??",
						Toast.LENGTH_SHORT).show();
				break;
			case ACCESS:
				// 设置适配器
				datas_tmp.addAll(datas);
				if (datas.size() > 0) {
					adapter = new MyXlistAdapter(getActivity(), datas_tmp);
					xlist.setAdapter(adapter);
				}

				break;
			case REFESH:

				// ArrayList datas1 = (ArrayList) msg.obj;
				// 将每次查到的数据存放到空集合的第一个位置（第0个位置，是置顶，不可替换）
				// 先判断一下获得数据是不是置顶的信息内容，是的话，从第二条展示，否的话，从第一条添加。

				// 设置更新时间。
				long millis = System.currentTimeMillis();
				SimpleDateFormat dateFormat = new SimpleDateFormat("HH:mm:ss");
				String time = dateFormat.format(millis);
				xlist.setRefreshTime(time);
				// 更新数据内容
				datas_tmp.addAll(0, datas);
				// 更新数据库
				adapter.notifyDataSetChanged();
				// 停止刷新
				onload();
				break;
			case REFESH2:

				datas_tmp.addAll(datas);
				// 更新数据库
				adapter.notifyDataSetChanged();
				// 停止刷新
				onload();
				break;

			}
		}

	};

	private String string;
	
	private String json1;
	private TextView zuobiao;

	// fragment的复用
	public static PageFragment getInstance(String string) {
		PageFragment pageFragment = null;
		if (pageFragment == null) {
			pageFragment = new PageFragment();
			Bundle bundle = new Bundle();
			bundle.putString("url", string);
			pageFragment.setArguments(bundle);
		}
		return pageFragment;
	}

	@Override
	public void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		// 获取展示界面的url
		string = getArguments().getString("url");
	}

	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
			Bundle savedInstanceState) {
		View view = inflater.inflate(R.layout.pagefragment, null);
		
		xlist = (XListView) view.findViewById(R.id.xListView);
	   // zuobiao = (TextView) view.findViewById(R.id.page_zuobiao);
		// 刷新时添加数据的集合
		arrayList = new ArrayList();
		// 打开开关
		xlist.setPullLoadEnable(true);
		// 设置xlistView的监听
		xlist.setXListViewListener(this);
		// 判断网络，获取数据
		initDataFromNet(string);
		// xlistView的item点击事件
		xlist.setOnItemClickListener(new OnItemClickListener() {

			@Override
			public void onItemClick(AdapterView arg0, View arg1, int arg2,
					long arg3) {
				// 跳转到webview,显示具体信息
				Intent intent = new Intent(getActivity(), MyWebView.class);
				String share_url = datas_tmp.get(arg2 - 1).getShare_url();
				intent.putExtra("url", share_url);
				startActivity(intent);
			}
		});
		return view;

	}

	// 获取数据
	private void initDataFromNet(String string) {
		// 判断是否有网
		// 获取数据的时候，存储的到本地
		// 没网的时候，加载本地数据
		boolean hasNet = MyHttpUtils.hasNet(getActivity());
		if (hasNet) {
			// 有网请求网络
			getDataFromNetTo(string, ACCESS);

		} else {
			// 创建数据库
			MyHelper myHelper = new MyHelper(getActivity());
			SQLiteDatabase database = myHelper.getReadableDatabase();
			// 没有网读取缓存
			Cursor cursor = database.rawQuery("select * from news", null);
			while (cursor.moveToNext()) {
				json1 = cursor.getString(cursor.getColumnIndex("json"));
			}
			// 关闭数据库
			database.close();
			// 解析json
			parseJon(json1);

			Toast.makeText(getActivity(), "链接网络失败", Toast.LENGTH_SHORT).show();
		}

	}

	// 请求网络(传进去形参)
	private void getDataFromNetTo(final String url1, final int ACCESS) {
		// 用Xutils请求网络
		HttpUtils httpUtils = new HttpUtils();
		// 清除网络缓存。设置缓存时间为0
		httpUtils.configCurrentHttpCacheExpiry(0);
		// 设置缓存大小，为0
		httpUtils.configHttpCacheSize(0);
		//httpuils请求网络
		httpUtils.send(HttpMethod.GET, url1, new RequestCallBack() {

			@Override//请求失败
			public void onFailure(HttpException arg0, String arg1) {
				handler.sendEmptyMessage(ERROR);
			}

			// 请求成功的时候
			@Override
			public void onSuccess(ResponseInfo arg0) {
				// 从网络上获取json串
				String json = arg0.result;
				// 获取json串时，首先保存到数据库
                //存数据之前先清空数据库
				//getActivity().deleteDatabase("news");
				// 创建数据库
				MyHelper myHelper = new MyHelper(getActivity());
				SQLiteDatabase database = myHelper.getReadableDatabase();
				//存储数据
				ContentValues values = new ContentValues();
				values.put("json", json);
				database.insert("news", null, values);
				// 关闭数据库
				database.close();
				// 解析json
				
				parseJon(json);
			}
		});
	};

	public void parseJon(String str) {
		News news = JsonUtils.parseJson(str);
		ArrayList data = news.getData();
		Message msg = new Message();
		msg.what = ACCESS;
		msg.obj = data;
		// 将数据发送到主线程，更新UI
		handler.sendMessage(msg);
	};

	@Override
	// 下拉刷新
	public void onRefresh() {
		// 当下啦的时候，重新获取数据。将获取的新数据，发送给主线程
		// REFESH--》意思是下拉时的数据类型
		getDataFromNetTo(string, REFESH);

		// 刷新需要请求网络
		// new Thread() {
		// public void run() {
		// try {
		// Thread.sleep(2000);
		// arrayList.add(0, "上啦加载的数据");
		// // 发送消息更新适配器
		// handler.sendEmptyMessage(REFESH);
		// } catch (Exception e) {
		//
		// e.printStackTrace();
		// }

		// };
		// }.start();

	}

	// 停止刷新
	public void onload() {
		xlist.stopRefresh();
		xlist.stopLoadMore();
	}

	@Override
	// 上啦加载
	public void onLoadMore() {
		getDataFromNetTo(string, REFESH2);
		// 刷新需要请求网络
		// new Thread() {
		// public void run() {
		// try {
		// Thread.sleep(2000);
		// arrayList.add("下啦加载的数据");
		// // 发送消息更新适配器
		// handler.sendEmptyMessage(REFESH);
		// } catch (Exception e) {
		//
		// e.printStackTrace();
		// }
		//
		// };
		// }.start();

	}
}

4.复杂的listView的用法，以及优化

import android.app.ActionBar.LayoutParams;
import android.graphics.drawable.BitmapDrawable;
import android.support.v4.app.FragmentActivity;
import android.text.TextUtils;
import android.view.Gravity;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.PopupWindow;
import android.widget.TextView;

import com.bawei.jinri20161108.R;
import com.bawei.jinri20161108_bean.Data;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;

public class MyXlistAdapter extends BaseAdapter implements OnClickListener {
	private final int NO_IMAGER = 0;
	private final int IMAGER_ONE = 1;
	private final int IMAGER_LIST = 2;
	private final int IMAGER_LAGER = 3;
	private final FragmentActivity activity;
	private final ArrayList datas;
	// 四个ViewHolder
	ViewHolder0 viewHolder0 = null;
	ViewHolder1 viewHolder1 = null;;
	ViewHolder2 viewHolder2 = null;;
	ViewHolder3 viewHolder3 = null;;

	public MyXlistAdapter(FragmentActivity activity, ArrayList datas) {
		this.activity = activity;
		this.datas = datas;
	}

	@Override
	public int getCount() {
		// TODO Auto-generated method stub
		return datas.size();
	}

	@Override
	public Object getItem(int position) {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public long getItemId(int position) {
		// TODO Auto-generated method stub
		return 0;
	}

	@Override
	// 优化处理1.条目复用convertView 2.控件复用 viewholder
	public View getView(int position, View convertView, ViewGroup parent) {
		// 取出数据
		Data data = datas.get(position);
		// 先获取类别，通过类别，分别加载不同的条目
		int type = getItemViewType(position);

		if (convertView == null) {

			switch (type) {
			case 0:
				// 将类new出来
				viewHolder0 = new ViewHolder0();
				convertView = View.inflate(activity, R.layout.image_text, null);
				viewHolder0.title = (TextView) convertView
						.findViewById(R.id.image_text_title);
				viewHolder0.source = (TextView) convertView
						.findViewById(R.id.image_text_zhuan);
				viewHolder0.label = (TextView) convertView
						.findViewById(R.id.image_text_zhi);
				viewHolder0.comment_count = (TextView) convertView
						.findViewById(R.id.image_text_ping);
				viewHolder0.publish_time = (TextView) convertView
						.findViewById(R.id.image_text_time);
				viewHolder0.im = (ImageView) convertView
						.findViewById(R.id.image_text_im);
				convertView.setTag(viewHolder0);
				break;
			case 1:// 一张图片
					// 将类new出来
				viewHolder1 = new ViewHolder1();
				convertView = View.inflate(activity, R.layout.image_one, null);
				viewHolder1.title = (TextView) convertView
						.findViewById(R.id.image_one_title);
				viewHolder1.source = (TextView) convertView
						.findViewById(R.id.image_one_zhuan);
				viewHolder1.label = (TextView) convertView
						.findViewById(R.id.image_one_zhi);
				viewHolder1.comment_count = (TextView) convertView
						.findViewById(R.id.image_one_ping);
				viewHolder1.publish_time = (TextView) convertView
						.findViewById(R.id.image_one_time);
				viewHolder1.im = (ImageView) convertView
						.findViewById(R.id.image_one_im);
				viewHolder1.image = (ImageView) convertView
						.findViewById(R.id.image_one_im2);
				convertView.setTag(viewHolder1);
				break;
			case 2:
				// 将类new出来
				viewHolder2 = new ViewHolder2();
				convertView = View.inflate(activity, R.layout.image_list, null);
				viewHolder2.title = (TextView) convertView
						.findViewById(R.id.image_list_title);
				viewHolder2.source = (TextView) convertView
						.findViewById(R.id.image_list_zhuan);
				viewHolder2.label = (TextView) convertView
						.findViewById(R.id.image_list_zhi);
				viewHolder2.comment_count = (TextView) convertView
						.findViewById(R.id.image_list_ping);
				viewHolder2.publish_time = (TextView) convertView
						.findViewById(R.id.image_list_time);
				viewHolder2.im = (ImageView) convertView
						.findViewById(R.id.image_list_im);
				viewHolder2.middle_image1 = (ImageView) convertView
						.findViewById(R.id.image_list_im1);
				viewHolder2.middle_image2 = (ImageView) convertView
						.findViewById(R.id.image_list_im2);
				viewHolder2.middle_image3 = (ImageView) convertView
						.findViewById(R.id.image_list_im3);
				convertView.setTag(viewHolder2);
				break;
			case 3:
				// 将类new出来
				viewHolder3 = new ViewHolder3();
				convertView = View
						.inflate(activity, R.layout.image_large, null);
				viewHolder3.title = (TextView) convertView
						.findViewById(R.id.image_large_title);
				viewHolder3.source = (TextView) convertView
						.findViewById(R.id.image_large_zhuan);
				viewHolder3.label = (TextView) convertView
						.findViewById(R.id.image_large_zhi);
				viewHolder3.comment_count = (TextView) convertView
						.findViewById(R.id.image_large_ping);
				viewHolder3.publish_time = (TextView) convertView
						.findViewById(R.id.image_large_time);
				viewHolder3.im = (ImageView) convertView
						.findViewById(R.id.image_large_im);
				viewHolder3.large = (ImageView) convertView
						.findViewById(R.id.image_large_im2);
				convertView.setTag(viewHolder3);
				break;
			}// 复用时调用
		} else {
			switch (type) {
			case 0:
				viewHolder0 = (ViewHolder0) convertView.getTag();// 得到布局中的控件
				break;
			case 1:
				viewHolder1 = (ViewHolder1) convertView.getTag();
				break;
			case 2:
				viewHolder2 = (ViewHolder2) convertView.getTag();
				break;
			case 3:
				viewHolder3 = (ViewHolder3) convertView.getTag();
				break;
			}

		}
		switch (type) {// 赋值
		case 0:
			// 赋值
			convertView.setTag(viewHolder0);
			viewHolder0.title.setText(data.getTitle());
			viewHolder0.source.setText(" " + data.getSource());
			viewHolder0.label.setText(" " + data.getLabel());
			viewHolder0.comment_count
					.setText(" 评论数：" + data.getComment_count());
			// 转换时间
			long publish_time = data.getPublish_time();
			SimpleDateFormat dateFormat = new SimpleDateFormat("hh:mm:ss");
			String format = dateFormat.format(new Date(publish_time));

			viewHolder0.publish_time.setText(" " + format);
			break;
		case 1:
			// 赋值
			viewHolder1.title.setText(data.getTitle());
			viewHolder1.source.setText(" " + data.getSource());
			viewHolder1.label.setText(" " + data.getLabel());
			viewHolder1.comment_count
					.setText(" 评论数：" + data.getComment_count());
			// 转换时间
			long publish_time2 = data.getPublish_time();
			SimpleDateFormat dateFormat2 = new SimpleDateFormat("HH:mm:ss");
			String time_one = dateFormat2.format(publish_time2);
			viewHolder1.publish_time.setText(" " + time_one);
			// 设置图片
			ImageLoaderConfiguration createDefault = ImageLoaderConfiguration
					.createDefault(activity);
			ImageLoader.getInstance().init(createDefault);
			ImageLoader.getInstance().displayImage(
					data.getMiddle_image().getUrl(), viewHolder1.image);
			break;
		case 2:
			// // 赋值
			viewHolder2.title.setText(data.getTitle());
			viewHolder2.source.setText(" " + data.getSource());
			viewHolder2.label.setText(data.getLabel());
			viewHolder2.comment_count
					.setText(" 评论数：" + data.getComment_count());
			// 转换时间
			long publish_time3 = data.getPublish_time();
			SimpleDateFormat dateFormat3 = new SimpleDateFormat("HH:mm:ss");
			String time_one3 = dateFormat3.format(publish_time3);
			viewHolder2.publish_time.setText(" " + time_one3);
			// 设置图片
			ImageLoaderConfiguration createDefault3 = ImageLoaderConfiguration
					.createDefault(activity);
			ImageLoader.getInstance().init(createDefault3);
			ImageLoader.getInstance().displayImage(
					data.getImage_list().get(0).getUrl(),
					viewHolder2.middle_image1);
			ImageLoader.getInstance().displayImage(
					data.getImage_list().get(1).getUrl(),
					viewHolder2.middle_image2);
			ImageLoader.getInstance().displayImage(
					data.getImage_list().get(2).getUrl(),
					viewHolder2.middle_image3);
			break;
		case 3:
			// 赋值
			viewHolder3.title.setText(data.getTitle());
			viewHolder3.source.setText(" " + data.getSource());
			viewHolder3.label.setText(" " + data.getLabel());
			viewHolder3.comment_count
					.setText(" 评论数：" + data.getComment_count());
			// 转换时间
			long publish_time4 = data.getPublish_time();
			SimpleDateFormat dateFormat4 = new SimpleDateFormat("HH:mm:ss");
			String time_one4 = dateFormat4.format(publish_time4);
			viewHolder3.publish_time.setText(" " + time_one4);
			// 设置图片
			ImageLoaderConfiguration createDefault4 = ImageLoaderConfiguration
					.createDefault(activity);
			ImageLoader.getInstance().init(createDefault4);
			ImageLoader.getInstance().displayImage(
					data.getLarge_image_list().get(0).getUrl(),
					viewHolder3.large);
			break;
		}
		return convertView;
	}

	// 传进id
	public void jump() {
		// 加载布局’
		View view = View.inflate(activity, R.layout.popupwindow, null);
		// 创建出来popupwindow
		PopupWindow window = new PopupWindow(view, LayoutParams.MATCH_PARENT,
				LayoutParams.WRAP_CONTENT);
		window.setOutsideTouchable(true);
		window.setFocusable(true);
		window.setBackgroundDrawable(new BitmapDrawable());
		window.showAtLocation(view, Gravity.CENTER, 0, 0);
	}

	// 需手动添加这两个方法
	@Override
	public int getItemViewType(int position) {
		// 取出数据
		Data data = datas.get(position);

		if (data.getLarge_image_list() != null
				&& data.getLarge_image_list().size() > 0) {
			return IMAGER_LAGER;
		} else if (data.getImage_list() != null
				&& data.getImage_list().size() > 0) {
			return IMAGER_LIST;
		} else if (!TextUtils.isEmpty(data.getMiddle_image().getUrl())) {
			return IMAGER_ONE;
		} else {
			return NO_IMAGER;
		}
	}

	@Override
	public int getViewTypeCount() {
		// TODO Auto-generated method stub
		return 4;
	}

	// 定义ViewHolder类
	// 无图
	class ViewHolder0 {
		public TextView title;
		public TextView label;
		public TextView source;
		public TextView comment_count;
		public TextView publish_time;
		public ImageView im;
	} // 一张图

	class ViewHolder1 {
		public TextView title;
		public TextView label;
		public TextView source;
		public TextView comment_count;
		public TextView publish_time;
		public ImageView image;
		public ImageView im;
	} // 三张图

	class ViewHolder2 {
		public TextView title;
		public TextView label;
		public TextView source;
		public TextView comment_count;
		public TextView publish_time;
		public ImageView middle_image1;
		public ImageView middle_image2;
		public ImageView middle_image3;
		public ImageView im;
	} // 一张大图

	class ViewHolder3 {
		public TextView title;
		public TextView label;
		public TextView source;
		public TextView comment_count;
		public TextView publish_time;
		public ImageView large;
		public ImageView im;
	}

	@Override
	public void onClick(View v) {
		switch (v.getId()) {
		case 0:
			viewHolder0.im.setOnClickListener(this);
			jump();
			break;
		case 1:
			viewHolder1.im.setOnClickListener(this);
			jump();
			break;
		
		}
		
	}
}