android 滑动加载数据

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:

 

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;
}
}

}

 

发表评论

电子邮件地址不会被公开。 必填项已用*标注