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android使用ViewPager實(shí)現(xiàn)輪播效果教程 android banner輪播圖( 二 )

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} catch (IOException e) {
e.printStackTrace();
}
return null;
}
//包裝圖片地址和圖片
class UrlAndBitmap{
String url;
Bitmap bitmap;
public UrlAndBitmap(String url, Bitmap bitmap) {
this.url = url;
this.bitmap = bitmap;
}
}
@Override
protected void onPostExecute(UrlAndBitmap result) {
//進(jìn)行接口回調(diào)
if(mListener != null){
mListener.onImageLoadComplete(result.url,result.bitmap);
}
}
}
}
JSONLoader.java
//讀取服務(wù)器json
package cn.edu.huse.banner_re.util;
import android.os.AsyncTask;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
/**
* 讀取服務(wù)器JSON的工具類
* @author xray
*
*/
public class JSONLoader {
public interface OnJSONLoadListener{
void onJSONLoadComplete(String json);
}
private OnJSONLoadListener mListener;
public void loadJSON(String urlStr,OnJSONLoadListener listener){
this.mListener = listener;
new JSONLoadTask().execute(urlStr);
}
class JSONLoadTask extends AsyncTask
@Override
protected String doInBackground(String... params) {
try {
URL url = new URL(params[0]);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
InputStream inputStream = conn.getInputStream();
byte[] buffer = new byte[1024];
int len = 0;
//StringBuffer 線程安全，性能低 VS StringBuilder 線程不安全，性能高
StringBuilder strB = new StringBuilder();
while((len = inputStream.read(buffer)) != -1){
//將字節(jié)碼轉(zhuǎn)換為String
String str = new String(buffer,0,len);
strB.append(str);
}
inputStream.close();
return strB.toString();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(String result) {
if(mListener != null){
mListener.onJSONLoadComplete(result);
}
}
}
}
MyViewPagerAdapter.java
package cn.edu.huse.banner_re.adapter;
import java.util.List;
import android.support.v4.view.PagerAdapter;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
/**
* 圖片輪播的適配器
* @author Lenovo
*
*/
public class MyViewPagerAdapter extends PagerAdapter {
private List mData;
public MyViewPagerAdapter(List mData) {
this.mData = http://www.ljsggw.cn/internet/mData;
}
//返回視圖的數(shù)量
@Override
public int getCount() {
return mData.size();
}
@Override
public boolean isViewFromObject(View arg0, Object arg1) {
return arg0 == arg1;
}
//銷毀圖片
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView(mData.get(position));
}
//添加圖片
@Override
public Object instantiateItem(ViewGroup container, int position) {
container.addView(mData.get(position));
return mData.get(position);
}
}
MainActivity.java
package cn.edu.huse.banner_re;
import java.util.ArrayList;
import java.util.List;
【android使用ViewPager實(shí)現(xiàn)輪播效果教程 android banner輪播圖】import org.json.JSONArray;
import org.json.JSONObject;
import android.app.Activity;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.os.Handler;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;

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