本文實例講述了Android基于ListView實現類似Market分頁加載效果。分享給大家供大家參考,具體如下:
最近幾天研究ListView實現分頁加載和滾動加載,發現可以用listView的OnScroll方法來實現,直接上代碼
ListViewScroll.java
package zy.lucifer.ListViewScroll;import android.app.Activity;import android.os.Bundle;import android.util.Log;import android.view.Gravity;import android.view.View;import android.view.ViewGroup;import android.widget.AbsListView;import android.widget.BaseAdapter;import android.widget.LinearLayout;import android.widget.ListView;import android.widget.ProgressBar;import android.widget.TextView;import android.widget.Toast;import android.widget.AbsListView.OnScrollListener;import android.widget.LinearLayout.LayoutParams;public class ListViewScroll extends Activity { /** Called when the activity is first created. */ private LayoutParams mLayoutParams = new LinearLayout.LayoutParams( LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT); /** * 設置布局顯示目標最大化屬性 */ private LayoutParams FFlayoutParams = new LinearLayout.LayoutParams( LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.FILL_PARENT); ListView listView ; private int lastItem = 0; LinearLayout loadingLayout; private listViewAdapter adapter; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); listView = (ListView) findViewById(R.id.myList); Log.i("test", "onCreate(Bundle savedInstanceState)>>>>>>>>>>>>>>>"); // 線性布局 LinearLayout layout = new LinearLayout(this); // 設置布局 水平方向 layout.setOrientation(LinearLayout.HORIZONTAL); // 進度條 ProgressBar progressBar = new ProgressBar(this); // 進度條顯示位置 progressBar.setPadding(0, 0, 15, 0); // 把進度條加入到layout中 layout.addView(progressBar, mLayoutParams); // 文本內容 TextView textView = new TextView(this); textView.setText("加載中..."); textView.setGravity(Gravity.CENTER_VERTICAL); // 把文本加入到layout中 layout.addView(textView, FFlayoutParams); // 設置layout的重力方向,即對齊方式是 layout.setGravity(Gravity.CENTER); // 設置ListView的頁腳layout loadingLayout = new LinearLayout(this); loadingLayout.addView(layout, mLayoutParams); loadingLayout.setGravity(Gravity.CENTER); listView.addFooterView(loadingLayout); adapter = new listViewAdapter(); listView.setAdapter(adapter); listView.setOnScrollListener(new OnScrollListener() { @Override public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) { // TODO Auto-generated method stub Log.i("test" , "Scroll>>>first: " + firstVisibleItem + ", visible: " + visibleItemCount + ", total: " + totalItemCount); lastItem = firstVisibleItem + visibleItemCount - 1; Log.i("test" , "Scroll>>>lastItem:" + lastItem); //顯示50條ListItem,即0-49,因為onScroll是在“滑動”執行過之后才觸發,所以用adapter.count<=41作條件 int scrolllength=101; if (adapter.count<=scrolllength) { if (firstVisibleItem+visibleItemCount==totalItemCount) { adapter.count += 10; adapter.notifyDataSetChanged(); listView.setSelection(lastItem); int currentPage=adapter.count/10; Toast.makeText(getApplicationContext(), "第"+currentPage+"頁", Toast.LENGTH_LONG).show(); } } else { listView.removeFooterView(loadingLayout); } } @Override public void onScrollStateChanged(AbsListView view, int scrollState) { // TODO Auto-generated method stub } }); } class listViewAdapter extends BaseAdapter { int count = 10; /* starting amount */ public int getCount() { return count; } public Object getItem(int pos) { return pos; } public long getItemId(int pos) { return pos; } public View getView(int pos, View v, ViewGroup p) { Log.i("test", "getView>>>pos:" + pos); TextView view; if (v == null) { view = new TextView(ListViewScroll.this); } else { view = (TextView) v; } view.setText("ListItem " + pos); view.setTextSize(20f); view.setGravity(Gravity.CENTER); view.setHeight(60); return view; } }}main.xml
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" ><ListView android:cacheColorHint="#00000000" android:id="@+id/myList"android:layout_width="fill_parent" android:layout_height="fill_parent" > </ListView></LinearLayout>
更多關于Android相關內容感興趣的讀者可查看本站專題:《Android視圖View技巧總結》、《Android布局layout技巧總結》、《Android圖形與圖像處理技巧總結》、《Android開發入門與進階教程》、《Android調試技巧與常見問題解決方法匯總》、《Android多媒體操作技巧匯總(音頻,視頻,錄音等)》、《Android基本組件用法總結》及《Android控件用法總結》
希望本文所述對大家Android程序設計有所幫助。
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