最近幾天研究ListView實現分頁載入和滾動式載入,發現可以用listView的OnScroll方法來實現,直接上代碼ListViewScroll.javaview plaincopy to clipboardprint?
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);
/**
* 設定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);
// 設定布局 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);
// 常值內容
TextView textView = new TextView(this);
textView.setText("載入中...");
textView.setGravity(Gravity.CENTER_VERTICAL);
// 把文本加入到layout中
layout.addView(textView, FFlayoutParams);
// 設定layout的重力方向，即對齊是
layout.setGravity(Gravity.CENTER);
// 設定ListView的頁尾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”執行過之後才觸發，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
view plaincopy to clipboardprint?
<?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>
