Android开发之java代码工具类。判断当前网络是否连接并请求下载图片

package cc.jiusan.www.utils;


import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
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 android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;


public class HttpUtils {
  /**
   * 判断当前网络是否连接
   * 
   * @param context
   * @return
   */
  public static boolean isNetWorkConn(Context context) {
    ConnectivityManager manager = (ConnectivityManager) context
        .getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo info = manager.getActiveNetworkInfo();
    if (info != null) {
      return info.isConnected();
    }
    return false;
  }


  // 网络请求下载图片
  public static byte[] loadImageFromNet(String url) {
    //OKHttp
    try {
      HttpClient client = new DefaultHttpClient();
      HttpGet getRequest = new HttpGet(url);
      HttpResponse response = client.execute(getRequest);
      // 500 服务器 错误    
      if (response.getStatusLine().getStatusCode() == 200) {
        HttpEntity entity = response.getEntity();
        return EntityUtils.toByteArray(entity);
      }
    } catch (Exception e) {
      e.printStackTrace();
    }


    return null;
  }
  
}