获取网络数据(Json串和图片)

权限

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>

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依赖

compile 'com.nostra13.universalimageloader:universal-image-loader:1.9.5'
compile 'com.google.code.gson:gson:2.2.4'
compile 'com.jakewharton:butterknife:8.8.1'
annotationProcessor 'com.jakewharton:butterknife-compiler:8.8.1'
implementation project(':xlistviewlibrary')

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工具类

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.util.Log;

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

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

/**
 * Created by liqiang on 2017/11/2.
 */

public class Utils {
    /**
     * 获取手机网络状态
     * -1 :无网络
     * 0 :  蜂窝网络;
     * 1  : wifi网络
     *
     * @param context 上下文对象
     * @return
     */
    public static int getNetType(Context context) {
        int mState = -1;// 代表无网络
        //获取android系统提供的服务, 转换成链接管理类,这个类专门处理链接相关的东西
        ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        //NetworkInfo封装了网络链接的信息
        NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
        if (activeNetworkInfo == null) {
            return mState;
        }
        int type = activeNetworkInfo.getType();

        if (type == ConnectivityManager.TYPE_WIFI) {//代表现在是wifi网络
            mState = 1;
        } else if (type == ConnectivityManager.TYPE_MOBILE) {
            mState = 0;
        }
        return mState;
    }

    private static String tag = "TAG";

    public static String getNetJson(String urlString) {
        try {
            //url对象封装接口字符串
            URL url = new URL(urlString);
            //用url打开连接, 返回值我们用HttpURLConnection
            HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
            urlConnection.setConnectTimeout(8000);//设置链接超时时间
            int responseCode = urlConnection.getResponseCode(); //获取状态码
            if (responseCode == 200) {
                InputStream inputStream = urlConnection.getInputStream();
                BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
                //可拼接的字符串
                StringBuilder stringBuilder = new StringBuilder();
                String temp = "";
                while ((temp = bufferedReader.readLine()) != null) {
                    stringBuilder.append(temp);

                }
                String jsonString = stringBuilder.toString();
                return jsonString;
            } else {
            }


        } catch (MalformedURLException e) {
            e.printStackTrace();
            Log.e(tag, "getNetJson: " + e.toString());
        } catch (IOException e) {
            e.printStackTrace();
            Log.e(tag, "getNetJson: " + e.toString());
        }

        return "";
    }

    /**
     * 获取网络图片
     *
     * @param urlString
     * @return
     */
    public static Bitmap getNetBitmap(String urlString) {
        try {
            URL url = new URL(urlString);
            HttpURLConnection httpurlConnection = (HttpURLConnection) url.openConnection();
            httpurlConnection.setConnectTimeout(8000);//设置链接超时时间
            int responseCode = httpurlConnection.getResponseCode();

            if (responseCode == 200) {
                InputStream inputStream = httpurlConnection.getInputStream();
                //BitmapFactory:  android提供好的加工图片的工具类,
                Bitmap bitmap = BitmapFactory.decodeStream(inputStream);
                return bitmap;
            } else {
                //do nothing
            }
        } catch (MalformedURLException e) {

            e.printStackTrace();
            Log.e(tag, "getNetBitmap: " + e.toString());
        } catch (IOException e) {
            e.printStackTrace();
            Log.e(tag, "getNetBitmap: " + e.toString());
        }
        return null;
    }


    public static String getNetClient(String urlString) {
        //得到httpclient对象
        DefaultHttpClient defaultHttpClient = new DefaultHttpClient();
        //封装get请求
        HttpGet httpGet = new HttpGet(urlString);
        try {
            //获取返回的response
            HttpResponse response = defaultHttpClient.execute(httpGet);
            //获取状态码
            int statusCode = response.getStatusLine().getStatusCode();
            if (statusCode == 200) {
                HttpEntity entity = response.getEntity();
                String json = EntityUtils.toString(entity);
                Log.e("httpclient", "run:----- "+json );
                return json;
            }else {

            }




        } catch (IOException e) {
            e.printStackTrace();
        }
        return "";
    }

}

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