AsyncTask+HttpClient网络请求图片实现自动轮播+小圆点

时间：2021-04-27 20:42:37
//主布局
<?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="fill_parent"
android:layout_height="fill_parent"></android.support.v4.view.ViewPager>
<LinearLayout 
android:id="@+id/ll_layout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="500dp"
android:layout_centerHorizontal="true"
android:orientation="horizontal">
</LinearLayout>
</RelativeLayout>
//子布局
<?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">
<ImageView 
android:id="@+id/iv_image"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</LinearLayout>
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
<item android:state_enabled="true" android:drawable="@drawable/true_123"></item>
<item android:state_enabled="false" android:drawable="@drawable/false_"></item>

</selector>

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" 
android:shape="oval">
<size android:width="5dp" android:height="5dp"/>
<solid android:color="#000000"/>
</shape>

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" 
android:shape="oval">
<size android:width="5dp" android:height="5dp"/>
<solid android:color="#808080"/>
</shape>
//代码块
package com.example.cart;

import java.io.IOException;
import java.util.List;
import java.util.concurrent.ExecutionException;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.StatusLine;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;

import com.example.adapter.MyAdapter;
import com.example.bean.Good;
import com.example.bean.Goods;
import com.example.bean.ImageUrl;
import com.example.bean.Show_Good;
import com.example.bean.Show_GoodAll;
import com.example.bean.Show_Goods;
import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;

import android.app.Activity;
import android.content.Intent;
import android.os.AsyncTask;
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.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.LinearLayout.LayoutParams;

public class ShowActivity extends Activity{
    private String url="http://mobile.hmeili.com/yunifang/mobile/goods/detail?id=";
    private String id;
    private ViewPager viewpager;
    private ImageView iv_image;
    private int lastindex;
    private LinearLayout ll_layout;
    List<ImageUrl> imageurl;
    private Handler handler = new Handler() {
        public void handleMessage(android.os.Message msg) {
            if (msg.what == 100){
                int currentItem = viewpager.getCurrentItem();
                currentItem++;
                viewpager.setCurrentItem(currentItem);
                play();
            }
        };
    };


    @Override
    protected void onCreate(Bundle savedInstanceState){
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.showactivity);
        viewpager=(ViewPager) findViewById(R.id.viewpager);
        //接收值
        Intent intent=getIntent();
        id=intent.getStringExtra("id");
        MyAsyncTask myAsyncTask = new MyAsyncTask();
        try {
            String s = myAsyncTask.execute(url + id).get();
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (ExecutionException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    class MyAsyncTask extends AsyncTask<String, Integer, String> {
        @Override
        protected String doInBackground(String... params) {
            // 取参数列表,数组角标为0的参数,也就是myAsyncTask.execute传递的参数
            String string = params[0];
            HttpClient httpClient = new DefaultHttpClient();
            HttpGet httpGet = new HttpGet(string);
            String s = null;
            try {
                HttpResponse httpResponse = httpClient.execute(httpGet);
                StatusLine statusLine = httpResponse.getStatusLine();
                int statusCode = statusLine.getStatusCode();
                if (statusCode == 200){
                    HttpEntity entity = httpResponse.getEntity();
                    s = EntityUtils.toString(entity);
                }
            } catch (ClientProtocolException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return s;
        }

        // 运行在主线程,在doInBackground方法执行之后执行,并且接收doInBackground方法的返回值
        @Override
        protected void onPostExecute(String result){
            super.onPostExecute(result);
            // 使用Gson解析
            Gson gson = new Gson();
            Show_GoodAll goodsall=gson.fromJson(result,Show_GoodAll.class);
            String goods_desc=goodsall.getData().getGoods().getGoods_desc();
            Log.i("goods_desc", goods_desc);
            Gson gson1=new Gson();
            imageurl=gson1.fromJson(goods_desc, new TypeToken<List<ImageUrl>>(){}.getType());
            Log.i("imageurl", imageurl.toString());
            viewpager.setAdapter(new PagerAdapter() {

                @Override
                public boolean isViewFromObject(View arg0, Object arg1) {
                    return arg0 == arg1;
                }
                @Override
                public int getCount() {
                    return Integer.MAX_VALUE;
                }
                @Override
                public Object instantiateItem(ViewGroup container, int position) {
                    // 转成View对象
                    View view = View.inflate(ShowActivity.this,R.layout.view, null); 
                    // 找对象
                    iv_image = (ImageView) view.findViewById(R.id.iv_image);
                    // 赋值
                    ImageLoader instance = ImageLoader.getInstance();
                    instance.init(ImageLoaderConfiguration
.createDefault(ShowActivity.this));
                    instance.displayImage(imageurl.get((position)%imageurl.size()).getUrl(), iv_image);
                    container.addView(view);
                    return view;
                }

                @Override
                public void destroyItem(ViewGroup container, int position,
                        Object object) {
                    container.removeView((View) object);
                }
            });
            viewpager.setCurrentItem(imageurl.size() * 10000);
            play();
            ll_layout = (LinearLayout) findViewById(R.id.ll_layout);
            for (int i = 0; i < imageurl.size(); i++) {
                // 创建指示点
                ImageView imageView = new ImageView(ShowActivity.this);
                // 设置指示点的背景
                imageView.setBackgroundResource(R.drawable.select);
                // 得到布局设置参数的对象,该对象的类型取决于当前view的父view
                LayoutParams layoutParams = new LayoutParams(
                        LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
                // 设置指示点的间距,当前设置的是到左边控件的距离
                layoutParams.leftMargin = 15;
                // 给指示点设置参数
                imageView.setLayoutParams(layoutParams);
                // 把imageView装进linearLayout布局中
                ll_layout.addView(imageView);
                // 设置指示点的初始状态,当指示点是第一个的时候,设置成选中状态,其余的都是不选中
                if (i == 0) {
                    imageView.setEnabled(true);
                } else {
                    imageView.setEnabled(false);
                }
            }
            //设置监听
            viewpager.setOnPageChangeListener(new OnPageChangeListener(){
                @Override
                public void onPageSelected(int position) {
                    int index = position % imageurl.size();
                    // 通过角标,得到linearLayout的子控件,设置当前指示点的选择状态
                    ll_layout.getChildAt(index).setEnabled(true);
                    // 设置上一个指示点的选择状态
                    ll_layout.getChildAt(lastindex).setEnabled(false);
                    // 记录上一个角标位置
                    lastindex = index;
                }
                @Override
                public void onPageScrolled(int arg0, float arg1, int arg2) {

                }
                @Override
                public void onPageScrollStateChanged(int arg0) {

                }
            });

        }
    }

    private void play(){
        handler.sendEmptyMessageDelayed(100, 1000);
    }

}
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