本文实例讲述了Android实现滑动加载数据的方法。分享给大家供大家参考。具体实现方法如下：
EndLessActivity.java如下：
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package com.ScrollListView;import Android.app.ListActivity;import Android.os.Bundle;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.ProgressBar;import Android.widget.TextView;import Android.widget.AbsListView.OnScrollListener;public class EndLessActivity extends ListActivity implements OnScrollListener { Aleph0 adapter = new Aleph0(); int mProgressStatus = 0 ; ProgressBar progressBar; protected void onCreate(Bundle savedInstanceState) { super .onCreate(savedInstanceState); LinearLayout searchLayout = new LinearLayout( this ); searchLayout.setOrientation(LinearLayout.HORIZONTAL); progressBar = new ProgressBar( this ); progressBar.setPadding( 0 , 0 , 15 , 0 ); searchLayout.addView(progressBar, new LinearLayout.LayoutParams( LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT )); TextView textView = new TextView( this ); textView.setText( " 加载中... " ); textView.setGravity(Gravity.CENTER_VERTICAL); searchLayout.addView(textView, new LinearLayout.LayoutParams( LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.FILL_PARENT )); searchLayout.setGravity(Gravity.CENTER); LinearLayout loadingLayout = new LinearLayout( this ); loadingLayout.addView(searchLayout, new LinearLayout.LayoutParams( LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT )); loadingLayout.setGravity(Gravity.CENTER); getListView().addFooterView(loadingLayout); setListAdapter(adapter); getListView().setOnScrollListener( this ); } public void onScroll(AbsListView view, int firstVisible, int visibleCount, int totalCount) { boolean loadMore = /* maybe add a padding */ firstVisible + visibleCount >= totalCount; if (loadMore) { adapter.count += visibleCount; // or any other amount adapter.notifyDataSetChanged(); } } public void onScrollStateChanged(AbsListView v, int s) { } class Aleph0 extends BaseAdapter { int count = 40 ; /* 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) { TextView view = new TextView(EndLessActivity. this ); view.setText( " entry " + pos); return view; } }} |
listview下部是按钮控制：
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package com.ScrollListView;import Android.app.ListActivity;import Android.os.Bundle;import Android.view.Gravity;import Android.view.View;import Android.view.ViewGroup;import Android.widget.AbsListView;import Android.widget.BaseAdapter;import Android.widget.Button;import Android.widget.LinearLayout;import Android.widget.ProgressBar;import Android.widget.TextView;import Android.widget.AbsListView.OnScrollListener;public class EndLessActivity extends ListActivity { Aleph0 adapter = new Aleph0(); int mProgressStatus = 0 ; protected void onCreate(Bundle savedInstanceState) { super .onCreate(savedInstanceState); LinearLayout searchLayout = new LinearLayout( this ); searchLayout.setOrientation(LinearLayout.HORIZONTAL); Button textView = new Button( this ); textView.setText( " 加载中... " ); textView.setGravity(Gravity.CENTER_VERTICAL); searchLayout.addView(textView, new LinearLayout.LayoutParams( LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.FILL_PARENT )); searchLayout.setGravity(Gravity.CENTER); LinearLayout loadingLayout = new LinearLayout( this ); loadingLayout.addView(searchLayout, new LinearLayout.LayoutParams( LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT )); loadingLayout.setGravity(Gravity.CENTER); getListView().addFooterView(loadingLayout); textView.setOnClickListener( new Button.OnClickListener() { @Override public void onClick(View v) { adapter.count += 10 ; adapter.notifyDataSetChanged(); } }); setListAdapter(adapter); // getListView().setOnScrollListener(this); } /* public void onScroll(AbsListView view, int firstVisible, int visibleCount, int totalCount) { boolean loadMore = firstVisible + visibleCount >= totalCount; if(loadMore) { adapter.count += visibleCount; adapter.notifyDataSetChanged(); } } */ public void onScrollStateChanged(AbsListView v, int s) { } class Aleph0 extends BaseAdapter { int count = 40 ; /* 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) { TextView view = new TextView(EndLessActivity. this ); view.setText( " entry " + pos); return view; } }} |
希望本文所述对大家的Android程序设计有所帮助。
