获取网络状态以及Fragment的隐藏和显示使用
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package com.ljn.myapplication.Utils;import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.net.ConnectivityManager;import android.net.NetworkInfo;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.client.methods.HttpPost;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 HP on 2017/11/4. */public class Utils { public static String getNetString(String str){ try { URL url=new URL(str); HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection(); int responseCode = urlConnection.getResponseCode(); if (responseCode==200){ InputStream is = urlConnection.getInputStream(); BufferedReader br=new BufferedReader(new InputStreamReader(is)); StringBuilder sb=new StringBuilder(); String line=null; while ((line=br.readLine())!=null){ sb.append(line); } return sb.toString(); } } catch (MalformedURLException e) { e.printStackTrace(); }catch (IOException e) { e.printStackTrace(); } return null; } public static Bitmap getNetBitmap(String str){ try { URL url=new URL(str); HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection(); int responseCode = urlConnection.getResponseCode(); if (responseCode==200){ InputStream is = urlConnection.getInputStream(); Bitmap bitmap = BitmapFactory.decodeStream(is); return bitmap; } } catch (MalformedURLException e) { e.printStackTrace(); }catch (IOException e) { e.printStackTrace(); } return null; } public static String getJsonByHttpClientGet(String jsonUrl) { //获取httpclient对象 DefaultHttpClient defaultHttpClient = new DefaultHttpClient(); //准备一个get请求// HttpGet httpGet = new HttpGet(jsonUrl); HttpPost httpPost = new HttpPost(jsonUrl); try { //得到服务器返回的数据; HttpResponse response = defaultHttpClient.execute(httpPost); //得到状态码 int statusCode = response.getStatusLine().getStatusCode(); if(statusCode ==200){ //entiry 里面封装的数据; HttpEntity entity = response.getEntity(); //这个result就是json字符串，剩下的就是解析工作了； //String result = EntityUtils.toString(entity); return EntityUtils.toString(entity); } } catch (IOException e) { e.printStackTrace(); } return null; } /** * 返回值 -1：没有网络 1：WIFI网络 2：net网络 //工具类 判断网络 */ public static int getNetype(Context context) { int netType = -1; ConnectivityManager connMgr = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo networkInfo = connMgr.getActiveNetworkInfo(); if (networkInfo == null) { return netType; } int nType = networkInfo.getType(); if (nType == ConnectivityManager.TYPE_MOBILE) { netType = 2; } else if (nType == ConnectivityManager.TYPE_WIFI) { netType = 1; } return netType; }}
package com.ljn.myapplication;import android.support.annotation.IdRes;import android.support.v4.app.Fragment;import android.support.v4.app.FragmentActivity;import android.support.v4.app.FragmentManager;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.RadioGroup;import android.widget.Toast;import com.ljn.myapplication.Fragment.MainFragment1;import com.ljn.myapplication.Fragment.MainFragment2;import com.ljn.myapplication.Fragment.MainFragment3;import com.ljn.myapplication.Fragment.MainFragment4;import com.ljn.myapplication.Utils.Utils;import java.net.JarURLConnection;import java.util.ArrayList;import java.util.List;import static android.R.id.list;public class MainActivity extends FragmentActivity {//private List<Fragment> list=new ArrayList<Fragment>(); private RadioGroup rg; private FragmentManager manager; private MainFragment1 fragment1; private MainFragment2 fragment2; private MainFragment3 fragment3; private MainFragment4 fragment4; @Override protected void onResume() { super.onResume(); int netype = Utils.getNetype(MainActivity.this); if (netype == -1) { Toast.makeText(this, "当前网络异常，请做联网操作！", Toast.LENGTH_SHORT).show(); } else if (netype == 1) { Toast.makeText(this, "当前网络正常，正在使用WiFi网络", Toast.LENGTH_SHORT).show(); } else if (netype == 0) { Toast.makeText(this, "当前网络正常，正在使用运营商网络(3G/4G),请注意流量的使用", Toast.LENGTH_SHORT).show(); } } @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); rg = findViewById(R.id.main_rg); //initData(); manager = getSupportFragmentManager(); fragment1 = new MainFragment1(); manager.beginTransaction().add(R.id.main_fl,fragment1).commit(); rg.setOnCheckedChangeListener(new Myoccl()); } /*private void initData() { list.add(new MainFragment1()); list.add(new MainFragment2()); list.add(new MainFragment3()); list.add(new MainFragment4()); }*/ private class Myoccl implements RadioGroup.OnCheckedChangeListener { @Override public void onCheckedChanged(RadioGroup radioGroup, @IdRes int i) { hideFragments(); switch (i){ case R.id.main_rb1: // manager.beginTransaction().replace(R.id.main_fl,list.get(0)).commit(); manager.beginTransaction().show(fragment1).commit(); break; case R.id.main_rb2: // manager.beginTransaction().replace(R.id.main_fl,list.get(1)).commit(); if (fragment2==null){ fragment2 = new MainFragment2(); manager.beginTransaction().add(R.id.main_fl,fragment2).commit(); }else{ manager.beginTransaction().show(fragment2).commit(); } break; case R.id.main_rb3: // manager.beginTransaction().replace(R.id.main_fl,list.get(2)).commit(); if (fragment3==null){ fragment3 = new MainFragment3(); manager.beginTransaction().add(R.id.main_fl,fragment3).commit(); }else{ manager.beginTransaction().show(fragment3).commit(); } break; case R.id.main_rb4: // manager.beginTransaction().replace(R.id.main_fl,list.get(3)).commit(); if (fragment4==null){ fragment4 = new MainFragment4(); manager.beginTransaction().add(R.id.main_fl,fragment4).commit(); }else{ manager.beginTransaction().show(fragment4).commit(); } break; } } } private void hideFragments(){ if (fragment1!=null&&fragment1.isAdded()){ manager.beginTransaction().hide(fragment1).commit(); } if (fragment2!=null&&fragment2.isAdded()){ manager.beginTransaction().hide(fragment2).commit(); } if (fragment3!=null&&fragment3.isAdded()){ manager.beginTransaction().hide(fragment3).commit(); } if (fragment4!=null&&fragment4.isAdded()){ manager.beginTransaction().hide(fragment4).commit(); } //manager.beginTransaction().commit(); }}package com.ljn.myapplication.Fragment;import android.graphics.Bitmap;import android.os.AsyncTask;import android.os.Bundle;import android.support.annotation.Nullable;import android.support.v4.app.Fragment;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.ListAdapter;import android.widget.ListView;import android.widget.TextView;import com.google.gson.Gson;import com.ljn.myapplication.Bean.TextBean;import com.ljn.myapplication.R;import com.ljn.myapplication.Utils.Utils;import java.util.ArrayList;import java.util.List;/** * Created by HP on 2017/11/4. */public class MainFragment1 extends Fragment { private ListView lv; private String NetString="https://api.tianapi.com/wxnew/?key=8d6e3228d25298f13af4fc40ce6c9679&num=10"; private List<TextBean.NewslistBean> list=new ArrayList<TextBean.NewslistBean>(); private MyAdapter adapter; @Nullable @Override public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { View view = inflater.inflate(R.layout.mainfragment1, container, false); lv = view.findViewById(R.id.child1_lv); return view; } @Override public void onActivityCreated(@Nullable Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); new MyAsyncTask().execute(NetString); adapter = new MyAdapter(); lv.setAdapter(adapter); } private class MyAsyncTask extends AsyncTask<String,Void,String>{ @Override protected String doInBackground(String... strings) { return Utils.getNetString(strings[0]); } @Override protected void onPostExecute(String s) { super.onPostExecute(s); Gson gson=new Gson(); TextBean json = gson.fromJson(s, TextBean.class); List<TextBean.NewslistBean> newslist = json.getNewslist(); list.addAll(newslist);adapter.notifyDataSetChanged();} } private class MyAdapter extends BaseAdapter { private ViewHolder vh; private TextView ctime; private TextView title; private TextView description; private ImageView img; @Override public int getCount() { return list.size(); } @Override public Object getItem(int i) { return null; } @Override public long getItemId(int i) { return 0; } @Override public View getView(int i, View view, ViewGroup viewGroup) { if (view==null){ vh = new MainFragment1.ViewHolder(); view = View.inflate(getActivity(), R.layout.item, null); view.setTag(vh); }else{ vh = (ViewHolder) view.getTag(); } vh.ctime = view.findViewById(R.id.item_ctime); vh.title = view.findViewById(R.id.item_title); vh.description = view.findViewById(R.id.item_description); vh.img = view.findViewById(R.id.item_img); vh.ctime.setText(list.get(i).getCtime()); vh.title.setText(list.get(i).getTitle()); vh.description.setText(list.get(i).getDescription()); new MyBitmap(vh.img).execute(list.get(i).getPicUrl()); return view; } private class MyBitmap extends AsyncTask<String,Void,Bitmap>{ private ImageView img; public MyBitmap(ImageView img) { this.img=img; } @Override protected Bitmap doInBackground(String... strings) { return Utils.getNetBitmap(strings[0]); } @Override protected void onPostExecute(Bitmap bitmap) { super.onPostExecute(bitmap); img.setImageBitmap(bitmap); } } } class ViewHolder{ TextView ctime; TextView title; TextView description; ImageView img; }}
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