android滑动分页

作者:Sanvi 邮箱:[e-mail] 转载请注明来源!

实现原理

通过手指的滑动,判断数据大小

然后动态改变数据

底部的加载是一个view

import android.app.ListActivity;
import android.os.Bundle;
import android.os.Handler;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.LinearLayout.LayoutParams;

public class Test extends ListActivity implements OnScrollListener {
Aleph0 adapter = new Aleph0();
int lastItem = 0;
int mProgressStatus = 0;
private Handler mHandler = new Handler();
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);
// Start lengthy operation in a background thread
// new Thread(new Runnable() {
// public void run() {
// while (mProgressStatus < 100) {
//
// // Update the progress bar
// mHandler.post(new Runnable() {
// public void run() {
// progressBar.setProgress(mProgressStatus);
// }
// });
// }
// }
// }).start();
registerForContextMenu(getListView());
setListAdapter(adapter);
getListView().setOnScrollListener(this);
}

public void onScroll(AbsListView v, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
lastItem = firstVisibleItem + visibleItemCount - 1 ;
System.out.println("lastItem:" + lastItem);
}

public void onScrollStateChanged(AbsListView v, int state) {
if(lastItem == adapter.count && state == OnScrollListener.SCROLL_STATE_IDLE){
adapter.count += 10;
adapter.notifyDataSetChanged();
}
// if(state == OnScrollListener.SCROLL_STATE_IDLE ) {
// adapter.count += 10;
// adapter.notifyDataSetChanged();
// }
}

class Aleph0 extends BaseAdapter {
int count = 10;

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(Test.this);
view.setText("entry " + pos);
view.setHeight(90);
return view;
}
}
}