ViewPager的定时滚动，动态加载数据
viewpager是用在滚动中相对比较多的，最近做一个定时滚动显示viewpager内容。
步骤：
一：在布局文件添加v4包下的viewpager：
android:id="@+id/main_viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center">
二：获取后台数据，现在就暂时自己造几条数据，并写adapter内容
//构造list集合
list=newArrayList();
list.add(R.mipmap.image1);
list.add(R.mipmap.image2);
list.add(R.mipmap.image3);
//我这边是显示的viewpager的很多信息，包括图片文字，所以构造view，在Java中写布局代码，
这个时候就需要我们构造view，privateListmList=new ArryList;
循化list集合数据，创建页面详情，通过add方法加载到mList，这样adapter中就可以传递过去值了：
for(inti =0;i
rootlayout=newRelativeLayout(this);
rootlayout.setLayoutParams(newRelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.MATCH_PARENT,RelativeLayout.LayoutParams.MATCH_PARENT));
rootlayout.setId(0);
ImageView imageView =newImageView(this);
RelativeLayout.LayoutParams image_Params =newRelativeLayout.LayoutParams(
dip2px(250),dip2px(192));
image_Params.setMargins(dip2px(5),0,dip2px(5),dip2px(5));
imageView.setLayoutParams(image_Params);
imageView.setImageResource(list.get(i));
//Picasso.with(ViewPagersActivity.this).load(tsfbBeans.get(i).getBook_pic()).error(R.mipmap.image1).into(imageView);
imageView.setId(1);
//字体颜色
Resources resource = (Resources) getBaseContext().getResources();
ColorStateList csl = (ColorStateList) resource.getColorStateList(R.color.book_text);
TextView text_Name =newTextView(this);
RelativeLayout.LayoutParams text_Name_Params =newRelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.WRAP_CONTENT,
RelativeLayout.LayoutParams.WRAP_CONTENT);
text_Name_Params.addRule(RelativeLayout.RIGHT_OF,imageView.getId());
text_Name_Params.addRule(RelativeLayout.ALIGN_TOP,imageView.getId());
text_Name_Params.setMargins(dip2px(10),dip2px(5),0,0);
text_Name.setLayoutParams(text_Name_Params);
text_Name.setText("图书描述：");
//text_Name.setText(tsfbBeans.get(i).getBook_name() + ":");
text_Name.setTextSize(TypedValue.COMPLEX_UNIT_SP,15);
text_Name.setTextColor(csl);
text_Name.setId(2);
TextView text_Email =newTextView(this);
RelativeLayout.LayoutParams text_Email_Params =newRelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.WRAP_CONTENT,
RelativeLayout.LayoutParams.WRAP_CONTENT);
text_Email_Params.addRule(RelativeLayout.RIGHT_OF,imageView.getId());
text_Email_Params.addRule(RelativeLayout.BELOW,text_Name.getId());
text_Email_Params.setMargins(dip2px(10),dip2px(5),dip2px(10),0);
text_Email.setLayoutParams(text_Email_Params);
text_Email.setText("《诗经》是中国古代诗歌开端，最早的一部诗歌总集，收集了西周初年至春秋中叶（前11世纪至前6世纪）的诗歌，共311篇，其中6篇为笙诗，即只有标题，没有内容，称为笙诗六篇");
//text_Email.setText(tsfbBeans.get(i).getBook_description());
text_Email.setTextSize(TypedValue.COMPLEX_UNIT_SP,13);
text_Email.setId(3);
TextView text_author =newTextView(this);
RelativeLayout.LayoutParams text_author_Params =newRelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.WRAP_CONTENT,
RelativeLayout.LayoutParams.WRAP_CONTENT);
text_author_Params.addRule(RelativeLayout.RIGHT_OF,imageView.getId());
text_author_Params.addRule(RelativeLayout.BELOW,text_Email.getId());
text_author_Params.setMargins(dip2px(10),dip2px(5),0,0);
text_author.setLayoutParams(text_author_Params);
text_author.setText("图书作者：");
//text_author.setText("图书作者：" + tsfbBeans.get(i).getBook_author());
text_author.setTextColor(csl);
text_author.setTextSize(TypedValue.COMPLEX_UNIT_SP,15);
text_author.setId(4);
TextView text_place =newTextView(this);
RelativeLayout.LayoutParams text_place_Params =newRelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.WRAP_CONTENT,
RelativeLayout.LayoutParams.WRAP_CONTENT);
text_place_Params.addRule(RelativeLayout.RIGHT_OF,imageView.getId());
text_place_Params.addRule(RelativeLayout.BELOW,text_author.getId());
text_place_Params.setMargins(dip2px(10),dip2px(5),0,0);
text_place.setLayoutParams(text_place_Params);
text_place.setText("出版社：");
//text_place.setText("出版社：" + tsfbBeans.get(i).getBook_publishing());
text_place.setTextColor(csl);
text_place.setTextSize(TypedValue.COMPLEX_UNIT_SP,15);
text_place.setId(5);
TextView text_data =newTextView(this);
RelativeLayout.LayoutParams text_data_Params =newRelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.WRAP_CONTENT,
RelativeLayout.LayoutParams.WRAP_CONTENT);
text_data_Params.addRule(RelativeLayout.RIGHT_OF,imageView.getId());
text_data_Params.addRule(RelativeLayout.BELOW,text_place.getId());
text_data_Params.setMargins(dip2px(10),dip2px(5),0,0);
text_data.setLayoutParams(text_data_Params);
text_data.setText("出版日期：");
// text_data.setText("出版日期：" + tsfbBeans.get(i).getBook_publication_date());
text_data.setTextColor(csl);
text_data.setTextSize(TypedValue.COMPLEX_UNIT_SP,15);
text_data.setId(6);
TextView text_description_name =newTextView(this);
RelativeLayout.LayoutParams text_DescriptionName_Params =newRelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.WRAP_CONTENT,
RelativeLayout.LayoutParams.WRAP_CONTENT);
text_DescriptionName_Params.addRule(RelativeLayout.BELOW,imageView.getId());
//text_Name_Params.addRule(RelativeLayout.ALIGN_TOP, imageView.getId());
text_DescriptionName_Params.setMargins(dip2px(10),dip2px(5),0,0);
text_description_name.setLayoutParams(text_DescriptionName_Params);
text_description_name.setText("图书简介：");
text_description_name.setTextColor(csl);
text_description_name.setTextSize(TypedValue.COMPLEX_UNIT_SP,15);
text_description_name.setId(7);
TextView text_description =newTextView(this);
RelativeLayout.LayoutParams text_Description_Params =newRelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.WRAP_CONTENT,
RelativeLayout.LayoutParams.WRAP_CONTENT);
text_Description_Params.addRule(RelativeLayout.BELOW,text_description_name.getId());
//text_Name_Params.addRule(RelativeLayout.ALIGN_TOP, imageView.getId());
text_Description_Params.setMargins(dip2px(10),dip2px(5),0,0);
text_description.setLayoutParams(text_Description_Params);
text_description.setText("111");
//text_description.setText(tsfbBeans.get(i).getBook_abstract());
text_description.setTextSize(TypedValue.COMPLEX_UNIT_SP,13);
text_description.setId(8);
rootlayout.addView(imageView,image_Params);
rootlayout.addView(text_Name,text_Name_Params);
rootlayout.addView(text_Email,text_Email_Params);
rootlayout.addView(text_description,text_Description_Params);
rootlayout.addView(text_author,text_author_Params);
rootlayout.addView(text_place,text_place_Params);
rootlayout.addView(text_data,text_data_Params);
rootlayout.addView(text_description_name,text_DescriptionName_Params);
//setContentView(rootlayout);
mList.add(rootlayout);
}
来讲讲adapter，基本写法就行，但是注意的是在添加view的时候必须保证是一个view的parent，要不然报错：
public classTTMyPagerAdaptersextendsPagerAdapter {
publicListlistViews=null;
publicTTestViewPagersActivitymContext;
publicTTMyPagerAdapters(List listViews,TTestViewPagersActivity mContext) {
this.listViews= listViews;
this.mContext= mContext;
Share.d("listviews"+ listViews.size());
}
@Override
public intgetCount() {
returnInteger.MAX_VALUE;
}
@Override
public booleanisViewFromObject(View arg0,Object arg1) {
returnarg0 == arg1;
}
@Override
public voiddestroyItem(View container, intposition,Object object) {
Share.d("TipsPagerAdapter,destroyItem is called "+ position);
((ViewPager) container).removeView(listViews.get(position %listViews.size()));
}
@Override
publicCharSequencegetPageTitle(intposition) {
return super.getPageTitle(position);
}
@Override
publicObjectinstantiateItem(View container, intposition) {
Share.d("TipsPagerAdapter, instantiateItem is called "+ position);
try{
((ViewPager) container).addView(
listViews.get(position %listViews.size()),0);
}catch(Exception e) {
}
// ((ViewPager) container).addView(listViews.get(position);
// return listViews.get(position);
Share.d("instantiateItem>>>>>>"+ position %listViews.size());
returnlistViews.get(position %listViews.size());
}
}
好了现在就是直接setadapter就行了，然后写个线程循环跳
adapter=newTTMyPagerAdapters(mList, this);
mPager.setAdapter(adapter);
mPager.setCurrentItem(position);
position是初始滑动值，净量设置越大越好，一般滑不到头
private voidinitAdapter() {
Share.d("mlist"+mList.size());
//
//TODO Auto-generated method stub
//TODO Auto-generated catch block
change=newThread(newRunnable() {
@Override
public voidrun() {
//TODO Auto-generated method stub
while(true) {
handler.sendEmptyMessage(0);
try{
Thread.sleep(5000);
}catch(InterruptedException e) {
//TODO Auto-generated catch block
e.printStackTrace();
}
}
}
});
change.start();
}
@SuppressLint("HandlerLeak")
privateHandlerhandler=newHandler() {
@Override
public voidhandleMessage(Message msg) {
super.handleMessage(msg);
switch(msg.what) {
case0:
position++;
mPager.setCurrentItem(position);
break;
default:
break;
}
}
};
好了现在可没有结束，你会发现list的集合数小于3的时候又空白页出现，但是一张的时候你又不想让他滚动，怎么办？主要是数据太短销毁的时候有bug，要是list多了那就无所谓了，所以怎么办呢？其中一个办法，可以把小于3的list通过一个for循环构造出大于他不就OK了，所以那就开干，循环添加吧！总结这个问题就是数据一条的时候，和2/3条的时候和多于3条的时候情况不一样，分别处理，我的做法是先在判断集合以2为界限判断，实验多次就是2的时候容易空白，所以区分是2和不是的时候，是2的话让他for循环添加两次进去数据变成4就好了，不是2的正常执行，但是不是2的里边包括1个的时候，那么就在setadapter的时候处理，区分新的list是1还是大于3的，这样问题就解决了，下边附上全部代码！
packagecom.example.administrator.student.ui;
importandroid.annotation.SuppressLint;
importandroid.app.Activity;
importandroid.content.Intent;
importandroid.content.res.ColorStateList;
importandroid.content.res.Resources;
importandroid.os.Bundle;
importandroid.os.Handler;
importandroid.os.Message;
importandroid.support.v4.view.ViewPager;
importandroid.util.TypedValue;
importandroid.view.MotionEvent;
importandroid.view.View;
importandroid.widget.ImageView;
importandroid.widget.RelativeLayout;
importandroid.widget.TextView;
importcom.example.administrator.student.R;
importcom.example.administrator.student.adapter.TMyPagerAdapters;
importcom.example.administrator.student.adapter.TTMyPagerAdapters;
importcom.example.administrator.student.bean.Main_Data;
importcom.example.administrator.student.utils.Share;
importjava.util.ArrayList;
importjava.util.List;
/**
* Created by Administrator on 2017/10/16.
*/
public classTTestViewPagersActivityextendsActivity {
privateViewPagermPager;
privateListmList;
privateListtsfbBeans=newArrayList();
privateTTMyPagerAdaptersadapter;
privateListlist;
private intposition=50000;
privateThreadchange;
privateRelativeLayoutrootlayout;
@Override
public voidonCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_viewpager);
mPager= (ViewPager) findViewById(R.id.main_viewpager);
//返回
ImageView back = (ImageView) findViewById(R.id.back);
back.setOnClickListener(newView.OnClickListener() {
@Override
public voidonClick(View view) {
finish();
}
});
Intent intent = getIntent();
String message = intent.getStringExtra("data");
//解析数据
// if (message.length() > 0) {
// Gson gson = new Gson();
// Main_Data main_data = gson.fromJson(message, new TypeToken() {
// }.getType());
// tsfbBeans = main_data.getTsfb();
// }
//构造list集合
list=newArrayList();
list.add(R.mipmap.image1);
list.add(R.mipmap.image2);
list.add(R.mipmap.image3);
// list.add(R.mipmap.image4);
mList=newArrayList();
initView();
}
private voidinitView() {
if(list.size() ==2) {
//如果数据是2，就添加两个数组以避免空白页
for(intm =0;m <2;m++) {
initValue();
}
}else{
//如果是一个数据那就添加一个
initValue();
}
adapter=newTTMyPagerAdapters(mList, this);
mPager.setAdapter(adapter);
if(mList.size() >1) {
mPager.setCurrentItem(position);
initAdapter();
}
// if (mList.size() < 2) {
//
// } else if (mList.size() == 2) {
//
// mPager.setCurrentItem(position + 1);
// initAdapter();
// } else {
// mPager.setCurrentItem(position);
// initAdapter();
// }
//mPager.setCurrentItem(count);
mPager.setOnPageChangeListener(listener);
mPager.setOnTouchListener(newView.OnTouchListener() {
@Override
public booleanonTouch(View view,MotionEvent motionEvent) {
return true;
}
});
}
private voidinitValue() {
for(inti =0;i
rootlayout=newRelativeLayout(this);
rootlayout.setLayoutParams(newRelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.MATCH_PARENT,RelativeLayout.LayoutParams.MATCH_PARENT));
rootlayout.setId(0);
ImageView imageView =newImageView(this);
RelativeLayout.LayoutParams image_Params =newRelativeLayout.LayoutParams(
dip2px(250),dip2px(192));
image_Params.setMargins(dip2px(5),0,dip2px(5),dip2px(5));
imageView.setLayoutParams(image_Params);
imageView.setImageResource(list.get(i));
//Picasso.with(ViewPagersActivity.this).load(tsfbBeans.get(i).getBook_pic()).error(R.mipmap.image1).into(imageView);
imageView.setId(1);
//字体颜色
Resources resource = (Resources) getBaseContext().getResources();
ColorStateList csl = (ColorStateList) resource.getColorStateList(R.color.book_text);
TextView text_Name =newTextView(this);
RelativeLayout.LayoutParams text_Name_Params =newRelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.WRAP_CONTENT,
RelativeLayout.LayoutParams.WRAP_CONTENT);
text_Name_Params.addRule(RelativeLayout.RIGHT_OF,imageView.getId());
text_Name_Params.addRule(RelativeLayout.ALIGN_TOP,imageView.getId());
text_Name_Params.setMargins(dip2px(10),dip2px(5),0,0);
text_Name.setLayoutParams(text_Name_Params);
text_Name.setText("图书描述：");
//text_Name.setText(tsfbBeans.get(i).getBook_name() + ":");
text_Name.setTextSize(TypedValue.COMPLEX_UNIT_SP,15);
text_Name.setTextColor(csl);
text_Name.setId(2);
TextView text_Email =newTextView(this);
RelativeLayout.LayoutParams text_Email_Params =newRelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.WRAP_CONTENT,
RelativeLayout.LayoutParams.WRAP_CONTENT);
text_Email_Params.addRule(RelativeLayout.RIGHT_OF,imageView.getId());
text_Email_Params.addRule(RelativeLayout.BELOW,text_Name.getId());
text_Email_Params.setMargins(dip2px(10),dip2px(5),dip2px(10),0);
text_Email.setLayoutParams(text_Email_Params);
text_Email.setText("《诗经》是中国古代诗歌开端，最早的一部诗歌总集，收集了西周初年至春秋中叶（前11世纪至前6世纪）的诗歌，共311篇，其中6篇为笙诗，即只有标题，没有内容，称为笙诗六篇");
//text_Email.setText(tsfbBeans.get(i).getBook_description());
text_Email.setTextSize(TypedValue.COMPLEX_UNIT_SP,13);
text_Email.setId(3);
TextView text_author =newTextView(this);
RelativeLayout.LayoutParams text_author_Params =newRelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.WRAP_CONTENT,
RelativeLayout.LayoutParams.WRAP_CONTENT);
text_author_Params.addRule(RelativeLayout.RIGHT_OF,imageView.getId());
text_author_Params.addRule(RelativeLayout.BELOW,text_Email.getId());
text_author_Params.setMargins(dip2px(10),dip2px(5),0,0);
text_author.setLayoutParams(text_author_Params);
text_author.setText("图书作者：");
//text_author.setText("图书作者：" + tsfbBeans.get(i).getBook_author());
text_author.setTextColor(csl);
text_author.setTextSize(TypedValue.COMPLEX_UNIT_SP,15);
text_author.setId(4);
TextView text_place =newTextView(this);
RelativeLayout.LayoutParams text_place_Params =newRelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.WRAP_CONTENT,
RelativeLayout.LayoutParams.WRAP_CONTENT);
text_place_Params.addRule(RelativeLayout.RIGHT_OF,imageView.getId());
text_place_Params.addRule(RelativeLayout.BELOW,text_author.getId());
text_place_Params.setMargins(dip2px(10),dip2px(5),0,0);
text_place.setLayoutParams(text_place_Params);
text_place.setText("出版社：");
//text_place.setText("出版社：" + tsfbBeans.get(i).getBook_publishing());
text_place.setTextColor(csl);
text_place.setTextSize(TypedValue.COMPLEX_UNIT_SP,15);
text_place.setId(5);
TextView text_data =newTextView(this);
RelativeLayout.LayoutParams text_data_Params =newRelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.WRAP_CONTENT,
RelativeLayout.LayoutParams.WRAP_CONTENT);
text_data_Params.addRule(RelativeLayout.RIGHT_OF,imageView.getId());
text_data_Params.addRule(RelativeLayout.BELOW,text_place.getId());
text_data_Params.setMargins(dip2px(10),dip2px(5),0,0);
text_data.setLayoutParams(text_data_Params);
text_data.setText("出版日期：");
// text_data.setText("出版日期：" + tsfbBeans.get(i).getBook_publication_date());
text_data.setTextColor(csl);
text_data.setTextSize(TypedValue.COMPLEX_UNIT_SP,15);
text_data.setId(6);
TextView text_description_name =newTextView(this);
RelativeLayout.LayoutParams text_DescriptionName_Params =newRelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.WRAP_CONTENT,
RelativeLayout.LayoutParams.WRAP_CONTENT);
text_DescriptionName_Params.addRule(RelativeLayout.BELOW,imageView.getId());
//text_Name_Params.addRule(RelativeLayout.ALIGN_TOP, imageView.getId());
text_DescriptionName_Params.setMargins(dip2px(10),dip2px(5),0,0);
text_description_name.setLayoutParams(text_DescriptionName_Params);
text_description_name.setText("图书简介：");
text_description_name.setTextColor(csl);
text_description_name.setTextSize(TypedValue.COMPLEX_UNIT_SP,15);
text_description_name.setId(7);
TextView text_description =newTextView(this);
RelativeLayout.LayoutParams text_Description_Params =newRelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.WRAP_CONTENT,
RelativeLayout.LayoutParams.WRAP_CONTENT);
text_Description_Params.addRule(RelativeLayout.BELOW,text_description_name.getId());
//text_Name_Params.addRule(RelativeLayout.ALIGN_TOP, imageView.getId());
text_Description_Params.setMargins(dip2px(10),dip2px(5),0,0);
text_description.setLayoutParams(text_Description_Params);
text_description.setText("111");
//text_description.setText(tsfbBeans.get(i).getBook_abstract());
text_description.setTextSize(TypedValue.COMPLEX_UNIT_SP,13);
text_description.setId(8);
rootlayout.addView(imageView,image_Params);
rootlayout.addView(text_Name,text_Name_Params);
rootlayout.addView(text_Email,text_Email_Params);
rootlayout.addView(text_description,text_Description_Params);
rootlayout.addView(text_author,text_author_Params);
rootlayout.addView(text_place,text_place_Params);
rootlayout.addView(text_data,text_data_Params);
rootlayout.addView(text_description_name,text_DescriptionName_Params);
//setContentView(rootlayout);
mList.add(rootlayout);
}
}
ViewPager.OnPageChangeListenerlistener=newViewPager.OnPageChangeListener() {
@Override
public voidonPageSelected(intarg0) {
//TODO Auto-generated method stub
//LogUtil.e("当前页面索引：" + arg0);
}
@Override
public voidonPageScrolled(intarg0, floatarg1, intarg2) {
//TODO Auto-generated method stub
}
@Override
public voidonPageScrollStateChanged(intarg0) {
//TODO Auto-generated method stub
}
};
private voidinitAdapter() {
Share.d("mlist"+mList.size());
//
//TODO Auto-generated method stub
//TODO Auto-generated catch block
change=newThread(newRunnable() {
@Override
public voidrun() {
//TODO Auto-generated method stub
while(true) {
handler.sendEmptyMessage(0);
try{
Thread.sleep(5000);
}catch(InterruptedException e) {
//TODO Auto-generated catch block
e.printStackTrace();
}
}
}
});
change.start();
}
@SuppressLint("HandlerLeak")
privateHandlerhandler=newHandler() {
@Override
public voidhandleMessage(Message msg) {
super.handleMessage(msg);
switch(msg.what) {
case0:
position++;
mPager.setCurrentItem(position);
break;
default:
break;
}
}
};
public intdip2px(floatdpValue) {
final floatscale =this.getResources().getDisplayMetrics().density;
return(int) (dpValue * scale +0.5f);
}
@Override
protected voidonDestroy() {
super.onDestroy();
}
}
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