网络图片Viewpager轮播图的实现
由于是网络请求，所以利用Xutils的httputils的网络请求
添加进xutils的jar宝和Gson包
先写xml
android:orientation="horizontal" > 之后进行画小点的颜色，在res中新建drawable文件 其中选择shape的xml,画出点的两个形态
选中形态dots_facuse.xml
未选中形态dots_normal.xml
这里的数据利用了网络的图片链接 所以写了个bean
package com.lqy.text;
import java.io.Serializable;
import java.sql.Savepoint;
import java.util.ArrayList;
public class bean implements Serializable {
private Mydata data;
public bean() {
super();
// TODO Auto-generated constructor stub
}
public bean(Mydata data) {
super();
this.data = data;
}
@Override
public String toString() {
return "bean [data=" + data + "]";
}
public Mydata getData() {
return data;
}
public void setData(Mydata data) {
this.data = data;
}
public class Mydata implements Serializable {
private ArrayList ad1;
public Mydata() {
super();
// TODO Auto-generated constructor stub
}
public Mydata(ArrayList ad1) {
super();
this.ad1 = ad1;
}
@Override
public String toString() {
return "Mydata [ad1=" + ad1 + "]";
}
public ArrayList getAd1() {
return ad1;
}
public void setAd1(ArrayList ad1) {
this.ad1 = ad1;
}
}
public class AD1 implements Serializable {
private String image;
public AD1() {
super();
// TODO Auto-generated constructor stub
}
public AD1(String image) {
super();
this.image = image;
}
@Override
public String toString() {
return "AD1 [image=" + image + "]";
}
public String getImage() {
return image;
}
public void setImage(String image) {
this.image = image;
}
}
}
之后 便是主axctivity
package com.lqy.text;
import java.util.ArrayList;
import com.google.gson.Gson;
import com.lidroid.xutils.BitmapUtils;
import com.lidroid.xutils.HttpUtils;
import com.lidroid.xutils.exception.HttpException;
import com.lidroid.xutils.http.ResponseInfo;
import com.lidroid.xutils.http.callback.RequestCallBack;
import com.lidroid.xutils.http.client.HttpRequest.HttpMethod;
import com.lqy.text.bean.AD1;
import com.nostra13.universalimageloader.core.ImageLoader;
import android.R.drawable;
import android.app.Activity;
import android.content.Context;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.os.Handler;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.LinearLayout.LayoutParams;
import android.widget.Toast;
public class MainActivity extends Activity {
protected static final String TAG = "off";
// 从网络请求的轮播图图片路径
private String url = "http://m.yunifang.com/yunifang/mobile/home?random=59053&encode=50f40a0c6ea9f7ce18fc7a2fc3d0742f";
private bean json;
ArrayList adlist = new ArrayList();
private ViewPager viewpager;
private LinearLayout dots;
private ArrayList dotslist;
Handler handler = new Handler() {
public void handleMessage(android.os.Message msg) {
if (msg.what == 1) {
int currentItem = viewpager.getCurrentItem();
currentItem++;
viewpager.setCurrentItem(currentItem);
Log.i(TAG, ".............");
startRool();
}
};
};
@SuppressWarnings("deprecation")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
viewpager = (ViewPager) findViewById(R.id.viewpager);
dots = (LinearLayout) findViewById(R.id.dots);
// 初始化小点
http();
// 利用xutils.jar包进行解析
viewpager.setCurrentItem(adlist.size() * 1000);
// viewpager的滑动
viewpagerscroview();
}
@SuppressWarnings("deprecation")
private void viewpagerscroview() {
viewpager.setOnPageChangeListener(new OnPageChangeListener() {
@Override
public void onPageSelected(int arg0) {
// TODO Auto-generated method stub
for (int i = 0; i < dotslist.size(); i++) {
if (i == arg0 % dotslist.size()) {
dotslist.get(i).setImageDrawable(
getResources().getDrawable(
R.drawable.dots_facuse));
} else {
dotslist.get(i).setImageDrawable(
getResources().getDrawable(
R.drawable.dots_normal));
}
}
}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
// TODO Auto-generated method stub
}
@Override
public void onPageScrollStateChanged(int arg0) {
// TODO Auto-generated method stub
}
});
startRool();
}
private void http() {
HttpUtils http = new HttpUtils();
http.send(HttpMethod.GET, url, new RequestCallBack() {
@Override
public void onFailure(HttpException arg0, String arg1) {
// TODO Auto-generated method stub
}
@SuppressWarnings("deprecation")
@Override
public void onSuccess(ResponseInfo arg0) {
// TODO Auto-generated method stub
// 得到的字符串
String info = arg0.result;
System.out.println(info + "=====================");
Gson gson = new Gson();
json = gson.fromJson(info, bean.class);
adlist.addAll(json.getData().getAd1());
viewpager.setAdapter(new PagerAdapter() {
@Override
public boolean isViewFromObject(View arg0, Object arg1) {
// TODO Auto-generated method stub
return arg0 == arg1;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return Integer.MAX_VALUE;
}
@Override
public void destroyItem(ViewGroup container, int position,
Object object) {
// TODO Auto-generated method stub
// super.destroyItem(container, position, object);
container.removeView((View) object);
}
@Override
public Object instantiateItem(ViewGroup container,
int position) {
// TODO Auto-generated method stub
ImageView image = new ImageView(MainActivity.this);
BitmapUtils map = new BitmapUtils(MainActivity.this);
map.display(image, adlist.get(position % adlist.size())
.getImage());
image.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
// TODO Auto-generated method stub
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
handler.removeCallbacksAndMessages(null);
break;
case MotionEvent.ACTION_UP:
handler.sendEmptyMessageDelayed(1, 2000);
break;
case MotionEvent.ACTION_CANCEL:
handler.sendEmptyMessageDelayed(1, 2000);
break;
default:
break;
}
return true;
}
});
container.addView(image);
return image;
}
});
initdots();
}
});
}
private void startRool() {
// 开始轮播
handler.sendEmptyMessageDelayed(1, 2000);
}
// 小点的实现
private void initdots() {
dotslist = new ArrayList();
dotslist.clear();
// 移除小点
dots.removeAllViews();
for (int i = 0; i < adlist.size(); i++) {
ImageView image = new ImageView(MainActivity.this);
// 小点初始化
Drawable drawable = null;
if (i == 0) {
// 亮色图片哦、
drawable = getResources().getDrawable(R.drawable.dots_facuse);
} else {
drawable = getResources().getDrawable(R.drawable.dots_normal);
}
// 添加进图片小点
image.setImageDrawable(drawable);
// 考虑到屏幕适配
LayoutParams params = new LayoutParams(dip2px(this, 10), dip2px(
this, 10));
params.setMargins(dip2px(this, 5), 0, dip2px(this, 5), 0);
dots.addView(image, params);
// 将小点的空间添加到集合中
dotslist.add(image);
}
}
/**
* 根据手机的分辨率从 dp 的单位 转成为 px(像素)
*/
public int dip2px(Context context, float dpValue) {
final float scale = context.getResources().getDisplayMetrics().density;
return (int) (dpValue * scale + 0.5f);
}
@Override
protected void onDestroy() {
// 移除所有的handler信息
handler.removeCallbacksAndMessages(null);
super.onDestroy();
}
}