首先写入网络权限
导入imagerlouder的jar包
布局
activity的布局
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
>
<android.support.v4.view.ViewPager
android:layout_width="match_parent"
android:layout_height="200dp"
android:id="@+id/vp"
></android.support.v4.view.ViewPager>
<LinearLayout
android:id="@+id/linear"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/vp"
></LinearLayout>
</RelativeLayout>
drawable文件夹中的布局
point_selected.xml
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="oval"
>
<solid android:color="#f00"></solid>
</shape>
point_unselected.xml
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="oval"
>
<solid android:color="#fff"></solid>
</shape>
Activity主方法里边
package com.example.denmo21;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ListView;
import com.handmark.pulltorefresh.library.PullToRefreshScrollView;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
private ImageView[] imgarray;
private PullToRefreshScrollView psv;
private ViewPager vp;
private ListView lv;
private String url = "http://pic8.nipic.com/20100701/5290458_114840036316_2.jpg";
private String url2 = "http://pic2.nipic.com/20090424/1468853_230119053_2.jpg";
private String url3 = "http://img3.3lian.com/2013/s1/20/d/57.jpg";
private String url4 = "http://pic39.nipic.com/20140226/18071023_164300608000_2.jpg";
private String url5 = "http://a0.att.hudong.com/15/08/300218769736132194086202411_950.jpg";
private LinearLayout linear;
private List<String> pagelist;
private Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
int index = vp.getCurrentItem();
vp.setCurrentItem(index + 1);
getinitimg(index + 1);//改变xioayd
sendEmptyMessageDelayed(1, 2000);
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
psv = (PullToRefreshScrollView) findViewById(R.id.psv);
vp = (ViewPager) findViewById(R.id.vp);
lv = (ListView) findViewById(R.id.lv);
linear = (LinearLayout) findViewById(R.id.linear);
pagelist = new ArrayList<>();
pagelist.add(url);
pagelist.add(url2);
pagelist.add(url3);
pagelist.add(url4);
pagelist.add(url5);
MyPage myPage = new MyPage(this, pagelist);
vp.setAdapter(myPage);
vp.setCurrentItem(pagelist.size() * 100);
imgarray = new ImageView[pagelist.size()];
handler.sendEmptyMessageDelayed(1, 1000);
initimg();//初始化小圆点
}
public void getinitimg(int index) {
int selectindex = index % pagelist.size();
for (int i = 0; i < pagelist.size(); i++) {
if (i == selectindex) {
imgarray[i].setImageResource(R.drawable.point_selected);
} else {
imgarray[i].setImageResource(R.drawable.point_unselected);
}
}
}
/**
* 初始化小圆点
*/
public void initimg() {
for (int i = 0; i < pagelist.size(); i++) {
ImageView img = new ImageView(this);
img.setScaleType(ImageView.ScaleType.FIT_XY);
if (i == 0) {
img.setImageResource(R.drawable.point_selected);
} else {
img.setImageResource(R.drawable.point_unselected);
}
//设置小圆点的大小
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(20, 20);
params.setMargins(0, 0, 10, 10);//设置间距
linear.addView(img, params);
imgarray[i] = img;
}
}
}
适配器
MyPage
package com.example.denmo21;
import android.content.Context;
import android.support.v4.view.PagerAdapter;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import com.nostra13.universalimageloader.core.ImageLoader;
import java.util.List;
/**
* Created by zld on 2017/12/21.
*/
public class MyPage extends PagerAdapter {
private Context context;
private List<String> pagelist;
public MyPage(Context context, List<String> pagelist) {
this.context = context;
this.pagelist = pagelist;
}
@Override
public int getCount() {
return Integer.MAX_VALUE;
}
@Override
public boolean isViewFromObject(View view, Object object) {
return view == object;
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
ImageView img = new ImageView(context);
img.setScaleType(ImageView.ScaleType.FIT_XY);
ImageLoader.getInstance().displayImage(pagelist.get(position % pagelist.size()), img);
container.addView(img);
return img;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView((View) object);
}
}
MyApption
package com.example.denmo21;
import android.app.Application;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;
/**
* Created by zld on 2017/12/21.
*/
public class MyApption extends Application {
@Override
public void onCreate() {
super.onCreate();
ImageLoaderConfiguration configuration = new ImageLoaderConfiguration.Builder(this).build();
ImageLoader.getInstance().init(configuration);
}
}