本文实例为大家分享了viewpager无限轮播获取网络图片的具体代码，供大家参考，具体内容如下
话不多说直接上代码，你们都懂的
小圆点属性
dot_focused.xml
<?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle"> <solid android:color="#f00"/> <corners android:radius="8dp"/> </shape>
dot_normal.xml
<?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle"> <solid android:color="#88000000"/> <corners android:radius="8dp"/> </shape>
dot_layout.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <View android:id="@+id/scrollView" android:layout_width="8dp" android:layout_height="8dp" android:layout_margin="3dp" android:background="@drawable/dot_normal" /> </LinearLayout>
activity_main.xml
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" > <android.support.v4.view.ViewPager android:id="@+id/viewPager" android:layout_width="match_parent" android:layout_height="match_parent"> </android.support.v4.view.ViewPager> <LinearLayout android:id="@+id/ll" android:layout_marginTop="450dp" android:orientation="horizontal" android:gravity="center" android:layout_width="match_parent" android:layout_height="20dp"/> </RelativeLayout>
以上是布局
下面src代码
import android.content.Intent; import android.os.AsyncTask; import android.os.Handler; import android.os.Message; import android.support.v4.view.PagerAdapter; import android.support.v4.view.ViewPager; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.Button; import android.widget.ImageView; import android.widget.LinearLayout; import com.bwie.bean.SuperClass; import com.bwie.utils.NetWorkUtils; import com.bwie.utils.URLDB; import com.google.gson.Gson; import com.nostra13.universalimageloader.core.ImageLoader; import java.util.ArrayList; import java.util.List; import java.util.Timer; import java.util.TimerTask; public class MainActivity extends AppCompatActivity { private ViewPager viewPager; private Button bt; private LinearLayout layout; private List<SuperClass.ResultBean.DataBean> data; private NetWorkUtils netWorkUtils = new NetWorkUtils();//实例化工具类 private List<ImageView>imgs = new ArrayList<ImageView>();//图片的集合 private List<View> dots = new ArrayList<View>(); //小圆点集合 private int i = 0; private int dot = 0; private Handler handler = new Handler(){ @Override public void handleMessage(Message msg) { super.handleMessage(msg); viewPager.setCurrentItem(i); dots.get(dot).setBackgroundResource(R.drawable.dots_normal); dots.get(i%imgs.size()).setBackgroundResource(R.drawable.dots_focus); dot=i%imgs.size(); } }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //异步网络请求 new AsyncTask<String,Integer,String>(){ @Override protected String doInBackground(String... params) { String json = netWorkUtils.getJsonHttpConnetion(URLDB.URL_IJ); return json; } @Override protected void onPostExecute(String s) { super.onPostExecute(s); SuperClass superClass = new Gson().fromJson(s, SuperClass.class); data = superClass.getResult().getData(); init();//初始化方法 } }.execute(); } //初始化方法 private void init() { viewPager = (ViewPager) findViewById(R.id.viewPager); layout = (LinearLayout) findViewById(R.id.ll); getImgs();//获取图片 getDots();//获取小圆点 //viewPager适配器 viewPager.setAdapter(new PagerAdapter() { @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) { int i = position % imgs.size(); ImageView imageView = imgs.get(i); imageView.setScaleType(ImageView.ScaleType.FIT_XY); container.addView(imageView); return imageView; } @Override public void destroyItem(ViewGroup container, int position, Object object) { container.removeView((View) object); } }); //设置初始化位置 i = imgs.size()*10; //得到位置 viewPager.setCurrentItem(i); //设置第一个圆点为true dots.get(0).setBackgroundResource(R.drawable.dots_focus); //timer自动轮播 Timer timer = new Timer(); timer.schedule(new TimerTask() { @Override public void run() { i = viewPager.getCurrentItem() + 1; handler.sendEmptyMessage(i); } },1,2000); } //图片的方法 private void getImgs() { for(int i = 0;i<data.size();i++){ List<SuperClass.ResultBean.DataBean.StepsBean> steps = data.get(i).getSteps(); String url = steps.get(0).getImg(); ImageView img = new ImageView(this); img.setScaleType(ImageView.ScaleType.FIT_XY); ImageLoader.getInstance().displayImage(url,img); imgs.add(img); } } //小圆点的方法 private void getDots() { for(int i=0;i<imgs.size();i++){ View view = LayoutInflater.from(this).inflate(R.layout.dot_item,null); View viewById = view.findViewById(R.id.scrollView); dots.add(viewById); layout.addView(view); } } }
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。