1. 程式人生 > >Android簡單實現下拉重新整理和上拉重新整理

Android簡單實現下拉重新整理和上拉重新整理

先把佈局檔案裡面新增一個ListView控制元件,

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.xh.tx.listviewfresh.MainActivity" >

    <ListView
        android:id="@+id/listview"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >
    </ListView>

</RelativeLayout>
用setOnScrollListener呼叫重新整理,
package com.xh.tx.listviewfresh;

import java.util.ArrayList;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class MainActivity extends Activity {
	private ListView lv;
	private ArrayList<String> date;
	private ArrayAdapter adapter;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		lv = (ListView) findViewById(R.id.listview);
		date = new ArrayList<String>();
		for (int i = 0; i < 30; i++) {
			date.add("測試資料" + i);
		}
		adapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1, date);
		lv.setAdapter(adapter);
		lv.setOnScrollListener(new OnScrollListener() {
			private int firstVisibleItem, visibleItemCount, totalItemCount;
			@Override
			public void onScrollStateChanged(AbsListView view, int scrollState) {
				if (scrollState == OnScrollListener.SCROLL_STATE_IDLE) {
					if (firstVisibleItem == 0) {
						addTop();
					}
					if(firstVisibleItem+visibleItemCount==totalItemCount){
						
						adddate();
					}
				}
			}

			@Override
			public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
				this.firstVisibleItem = firstVisibleItem;
				this.visibleItemCount = visibleItemCount;
				this.totalItemCount = totalItemCount;
				Log.i("", firstVisibleItem+"-----"+visibleItemCount+"-----"+totalItemCount);
			}
		});
	}
	//下拉重新整理
	private void addTop() {
		date.add(0, "上面追加資料" + (date.size() + 1));
		adapter.notifyDataSetChanged();
	}
	//上拉重新整理
	private void adddate(){
		date.add("下面追加資料" + (date.size() + 1));
		adapter.notifyDataSetChanged();
	}

}
實現如下圖:下拉重新整理圖:

上拉重新整理圖: