组件代码如下：
public class PageControl extends LinearLayout implements OnClickListener{
private ImageButton firstImg;
private ImageButton preImg;
private ImageButton nextImg;
private ImageButton endImg;
private TextView totalPageText;
private TextView curPageText;
private int numPerPage=10;
private int curPage=1;
private int count=0;
private OnPageChangeListener pageChangeListener;
public PageControl(Context context) {
super(context);
initPageComposite(context);
}
public PageControl(Context context, AttributeSet attrs) {
super(context, attrs);
initPageComposite(context);
}
public PageControl(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
initPageComposite(context);
}
private void initPageComposite(Context context){
this.setPadding(5,5,5,5);
firstImg=new ImageButton(context);
firstImg.setId(1);
firstImg.setImageResource(R.drawable.firstpage);
firstImg.setPadding(0,0,0,0);
LayoutParams layoutParam=new LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT);
layoutParam.setMargins(0,0,5,0);
firstImg.setLayoutParams(layoutParam);
firstImg.setOnClickListener(this);
this.addView(firstImg);
preImg=new ImageButton(context);
preImg.setId(2);
preImg.setImageResource(R.drawable.prepage);
preImg.setPadding(0,0,0,0);
layoutParam=new LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT);
layoutParam.setMargins(0,0,5,0);
preImg.setLayoutParams(layoutParam);
preImg.setOnClickListener(this);
this.addView(preImg);
nextImg=new ImageButton(context);
nextImg.setId(3);
nextImg.setImageResource(R.drawable.nextpage);
nextImg.setPadding(0,0,0,0);
layoutParam=new LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT);
layoutParam.setMargins(0,0,5,0);
nextImg.setLayoutParams(layoutParam);
nextImg.setOnClickListener(this);
this.addView(nextImg);
endImg=new ImageButton(context);
endImg.setId(4);
endImg.setImageResource(R.drawable.lastpage);
endImg.setPadding(0,0,0,0);
layoutParam=new LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT);
layoutParam.setMargins(0,0,5,0);
endImg.setLayoutParams(layoutParam);
endImg.setOnClickListener(this);
this.addView(endImg);
totalPageText=new TextView(context);
layoutParam=new LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.MATCH_PARENT);
layoutParam.setMargins(5,0,5,0);
totalPageText.setLayoutParams(layoutParam);
totalPageText.setText("总页数");
this.addView(totalPageText);
curPageText=new TextView(context);
layoutParam=new LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.MATCH_PARENT);
layoutParam.setMargins(5,0,5,0);
curPageText.setLayoutParams(layoutParam);
curPageText.setText("当前页");
this.addView(curPageText);
}
/**
* 初始化分页组件的显示状态
* @param newCount
*/
public void initPageShow(int newCount){
count=newCount;
int totalPage=count%numPerPage==0?count/numPerPage:count/numPerPage+1;
curPage=1;
firstImg.setEnabled(false);
preImg.setEnabled(false);
if(totalPage<=1){
endImg.setEnabled(false);
nextImg.setEnabled(false);
}else{
endImg.setEnabled(true);
nextImg.setEnabled(true);
}
totalPageText.setText("总页数 "+totalPage);
curPageText.setText("当前页 "+curPage);
}
/**
* 分页按钮被点击时更新状态,该方法要在initPageShow后调用
*/
@Override
public void onClick(View view) {
if(pageChangeListener==null){
return;
}
int totalPage=count%numPerPage==0?count/numPerPage:count/numPerPage+1;
switch(view.getId()){
case 1:
curPage=1;
firstImg.setEnabled(false);
preImg.setEnabled(false);
if(totalPage>1){
nextImg.setEnabled(true);
endImg.setEnabled(true);
}
break;
case 2:
curPage--;
if(curPage==1){
firstImg.setEnabled(false);
preImg.setEnabled(false);
}
if(totalPage>1){
nextImg.setEnabled(true);
endImg.setEnabled(true);
}
break;
case 3:
curPage++;
if(curPage==totalPage){
nextImg.setEnabled(false);
endImg.setEnabled(false);
}
firstImg.setEnabled(true);
preImg.setEnabled(true);
break;
case 4:
curPage=totalPage;
nextImg.setEnabled(false);
endImg.setEnabled(false);
firstImg.setEnabled(true);
preImg.setEnabled(true);
break;
default:
break;
}
totalPageText.setText("总页数 "+totalPage);
curPageText.setText("当前页 "+curPage);
pageChangeListener.pageChanged(curPage,numPerPage);
}
public OnPageChangeListener getPageChangeListener() {
return pageChangeListener;
}
/**
* 设置分页监听事件
* @param pageChangeListener
*/
public void setPageChangeListener(OnPageChangeListener pageChangeListener) {
this.pageChangeListener = pageChangeListener;
}
}
分页监听器代码：
/**
* 分页监听事件
*/
public interface OnPageChangeListener {
/**
* 点击分页按钮时触发此操作
* @param curPage 当前页
* @param numPerPage 每页显示个数
*/
public void pageChanged(int curPage,int numPerPage);
}
使用示例：实现ListView分页效果
Activity布局如下：
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<ListView
android:id="@+id/wordList"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="11" >
</ListView>
<org.chen.wordreview.control.PageControl
android:id="@+id/wordListPageControl"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"/>
</LinearLayout>
Activity实现:
//实现分页监听接口
public class MainActivity extends Activity implements OnPageChangeListener{
private WordDao wordDao;
private ListView wordListView;
private ArrayAdapter<Word> adapter;
private PageControl pageControl;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_wordlist);
...
//初始化分页组件
pageControl=(PageControl) findViewById(R.id.wordListPageControl);
pageControl.setPageChangeListener(this);
pageControl.initPageShow(wordDao.getCount());
...
}
/**
* 点击分页按钮时触发该方法的执行
* @param curPage 当前页
* @param numPerPage 每页显示记录数
*/
@Override
public void pageChanged(int curPage, int numPerPage) {
List<Word> words=wordDao.findOnePage((curPage-1)*numPerPage,numPerPage);
adapter.clear();
adapter.addAll(words);
adapter.notifyDataSetChanged();
}
}
