Android ListView滚动提示

Android
ListView滚动提示（一）

我们下面的代码主要讲的就是listview滚动的时候会出现一个提示，有了这个小的效果，我们可以再滚动的时候给用户带来不一样的感觉，如果要更好的效果，那就要看你怎么写代码了，下面的只是一个小的实例，那么我们还等什么呀，快来看代码吧：

java代码：

package eoe.main;

import java.net.HttpURLConnection;

import java.util.ArrayList;

import java.util.HashMap;

import org.json.JSONObject;

import android.app.Activity;

import android.app.ProgressDialog;

import android.graphics.drawable.Drawable;

import android.os.Bundle;

import android.os.Handler;

import android.os.HandlerThread;

import android.os.Looper;

import android.os.Message;

import android.view.LayoutInflater;

import android.view.View;

import android.widget.AbsListView;

import android.widget.AbsListView.OnScrollListener;

import android.widget.Button;

import android.widget.LinearLayout;

import android.widget.ListView;

import android.widget.RelativeLayout;

import android.widget.TextView;

import com.stay.wifi.R;

/**

* @author Stay

* 动态加载listview数据，上拉 刷新，下拉 更多

*/

public class ListViewActivity extends Activity implements OnScrollListener {

private static final int LOAD = 0;

private static final int ERROR = 0;

private static final int MEMBER = 1;

private static final int LOADED = 2;

private static final int DIALOG = 3;

private static final int FULL = 4;

private NearbyAdapter adapter;

private ListView nearby_lv;

private RelativeLayout nearby_lv_header;

private Button list_bottom_btn;

private LinearLayout list_bottom_linear;

private TextView bottom_progress_text;

private RelativeLayout nearby_lv_footer;

private Button list_header_btn;

private LinearLayout list_header_linear;

private TextView heard_progress_text;

private ArrayList<JSONObject> nearby_data = new ArrayList<JSONObject>();

private int lastItem;

private HashMap<String, Drawable> imageCache;

private com.stay.main.ListViewActivity.MyHandler myHandler;

private ProgressDialog dialog;

private int curPage = 1;

private boolean isMember = false;

private int firstItem;

public int count;

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

initView();

myHandler.sendEmptyMessage(LOAD);

}

@Override

public void onScrollStateChanged(AbsListView view, int scrollState) {

DebugUtil.debug("onScrollStateChanged");

//当滚动停止且滚动的总数等于数据的总数，去加载

if (lastItem == count && scrollState == SCROLL_STATE_IDLE) {

DebugUtil.debug("onScrollStateChanged--------next");

if (curPage == 4 && !isMember) {

DebugUtil.show(this, "您不是正式会员，请申请正式会员，");

list_bottom_linear.setVisibility(View.GONE);

} else {

//加载数据

myHandler.sendEmptyMessage(LOAD);

}

return;

}

//当往上拉时更新数据，将data清空然后去重新加载

if (firstItem == 0 && scrollState == SCROLL_STATE_IDLE) {

DebugUtil.debug("onScrollStateChanged--------refresh");

curPage = 0;

myHandler.sendEmptyMessage(LOAD);

}

}

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Android ListView滚动提示（二）

java代码：

@Override

public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {

DebugUtil.debug("firstVisibleItem=" + firstVisibleItem);

DebugUtil.debug("visibleItemCount=" + visibleItemCount);

DebugUtil.debug("totalItemCount=" + totalItemCount);

　　

//这里要减二，因为我加了header footer

lastItem = firstVisibleItem + visibleItemCount - 2;

firstItem = firstVisibleItem;

}

public int getData() {

try {

HttpURLConnection conn = DownloadUtil.download("http://zdevl.mapi.jjdd.com/nearby/lbs?page=" + curPage);

ArrayList<JSONObject> temp = JSONUtil.streamToJsonList(conn.getInputStream());

if (curPage == 0 && nearby_data.size() > 0) {

nearby_data.clear();

count = 0;

}

　　

if (temp != null && temp.size() > 0) {

count += temp.size();

nearby_data.addAll(temp);

DebugUtil.debug("nearby_data.size()="+nearby_data.size());

} else {

return FULL;

}

return LOADED;

} catch (Exception e) {

return ERROR;

}

}

private Handler handler = new Handler() {

@Override

public void handleMessage(Message msg) {

super.handleMessage(msg);

switch (msg.what) {

case DIALOG:

list_bottom_linear.setVisibility(View.VISIBLE);

list_header_linear.setVisibility(View.VISIBLE);

break;

case LOADED:

list_bottom_linear.setVisibility(View.GONE);

list_header_linear.setVisibility(View.GONE);

curPage++;

adapter.notifyDataSetChanged();

break;

case ERROR:

DebugUtil.debug("error,missing data");

break;

case MEMBER:

DebugUtil.debug("you must regist formal member");

break;

default:

break;

}

}

};

//创建子线程加载数据，然后更新

private class MyHandler extends Handler {

private int status;

public MyHandler(Looper looper) {

super(looper);

}

@Override

public void handleMessage(Message msg) {

synchronized (this) {

switch (msg.what) {

case LOAD:// get data from server

handler.sendEmptyMessage(DIALOG);//显示等待框

status = getData();

handler.sendEmptyMessageDelayed(status, 1000);

break;

default:

break;

}

}

}

}

public void initView() {

imageCache = new HashMap<String, Drawable>();

HandlerThread handlerThread = new HandlerThread("nearby");

// 在使用HandlerThread的getLooper()方法之前，必须先调用该类的start();

handlerThread.start();

myHandler = new MyHandler(handlerThread.getLooper());

nearby_lv = (ListView) findViewById(R.id.nearby_lv);

nearby_lv_footer = (RelativeLayout) LayoutInflater.from(ListViewActivity.this).inflate(R.layout.nearby_lv_header, null);

list_bottom_btn = (Button) nearby_lv_footer.findViewById(R.id.list_bottom_btn);

list_bottom_linear = (LinearLayout) nearby_lv_footer.findViewById(R.id.list_bottom_linear);

bottom_progress_text = (TextView) nearby_lv_footer.findViewById(R.id.progress_text);

nearby_lv_header = (RelativeLayout) LayoutInflater.from(ListViewActivity.this).inflate(R.layout.nearby_lv_header, null);

list_header_btn = (Button) nearby_lv_header.findViewById(R.id.list_bottom_btn);

list_header_linear = (LinearLayout) nearby_lv_header.findViewById(R.id.list_bottom_linear);

heard_progress_text = (TextView) nearby_lv_header.findViewById(R.id.progress_text);

list_header_btn.setText("刷新");

list_bottom_btn.setText("更多");

list_header_linear.setVisibility(View.GONE);

nearby_lv.addHeaderView(nearby_lv_header);

nearby_lv.addFooterView(nearby_lv_footer);

// list_header_btn.setOnClickListener(header_click);

adapter = new NearbyAdapter(ListViewActivity.this, nearby_data);

nearby_lv.setAdapter(adapter);

nearby_lv.setOnScrollListener(ListViewActivity.this);

}

}

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