package com.example.liangjinzi20190218;
import android.content.Context;
import android.net.ConnectivityManager;
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.AsyncTask;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
public class Util {
///创建接口
public interface CallBackA {
//写方法
void getData(String s);
}
//封装异步
public static void getAsyncTask(String url, final CallBackA backA) {
new AsyncTask<String, Void, String>() {
@Override
protected String doInBackground(String... strings) {
return httpGet(strings[0]);
}
@Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
backA.getData(s);
}
}.execute(url);
}
//====================================================================
/*
* 网络判断
* */
public static boolean isNetworkConnected(Context context) {
if (context != null) {
//获取连接管理器
ConnectivityManager mConnectivityManager = (ConnectivityManager)
context.getSystemService(Context.CONNECTIVITY_SERVICE);
//获取网络状态
NetworkInfo mNetworkInfo = mConnectivityManager.getActiveNetworkInfo();
if (mNetworkInfo != null) {
//判断网络是否可用
return mNetworkInfo.isAvailable();
}
}
return false;
}
public static String httpGet(String strUrl) {
//设置url
try {
URL url = new URL(strUrl);
//获取HttpURLConnection
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
//设置为get请求
connection.setRequestMethod("GET");
//设置连接主机超时时间
connection.setConnectTimeout(5000);
//设置从主机读取数据超时
connection.setReadTimeout(5000);
//得到数据
InputStream stream = connection.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(stream));
//拼接数据
StringBuilder builder = new StringBuilder();
String str = "";
while ((str = reader.readLine()) != null) {
builder.append(str);
}
//关闭连接
connection.disconnect();
//返回数据
return builder.toString();
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
}