android_判断网络/添加Fragment显示listview

权限:

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

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

布局控件:

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent" tools:context="com.bwei.day_14rikao.MainActivity">

<fragment
android:id="@+id/ff"
android:name="com.bwei.day_14rikao.BeaseFragmrnt"
android:layout_width="match_parent"
android:layout_height="match_parent"></fragment>

</android.support.constraint.ConstraintLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">

<ListView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/lv"/>
</LinearLayout>

MainActivity:
Fragment:

package com.bwei.day_14rikao;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.AsyncTask;
import android.os.Bundle;
import android.provider.Settings;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;

import com.google.gson.Gson;

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.util.ArrayList;
import java.util.List;

/**
* author:Created by WangZhiQiang on 2017/9/14.
*/

public class BeaseFragmrnt extends Fragment {

private List<String> lists;
private View view;
private ListView lv;
private StringBuilder builder;
private List<List<String>> result;
ArrayList<String> list = new ArrayList<>();

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
view = inflater.inflate(R.layout.fragment, container, false);
return view;
}

@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
//初始化控件
lv = (ListView) view.findViewById(R.id.lv);
//获取判断网络返回值
boolean b = isNetworkConnected(getActivity());
Log.e("gsyfdgvsydhfbsjh", b + "");
//判断是否连接网络
if (b) {
//如果返回true则加载数据
new MAsticy().execute("https://suggest.taobao.com/sug?code=utf-8&q=%E6%98%BE%E7%A4%BA%E5%99%A8");
} else {
//否则调用此方法进行下一步操作
checkNetwork(getActivity());
}
}

public class MAsticy extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... strings) {
try {
//获取路径
URL url = new URL(strings[0]);
//获取 HttpURLConnection对象
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
//获取请求码
int responseCode = urlConnection.getResponseCode();
//判断请求码
if (responseCode == 200) {
//将路径转换字节流获取
InputStream inputStream = urlConnection.getInputStream();
//使用bufferReader读取
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
//拼接字符串
builder = new StringBuilder();
//定义变量
String str = "";
//循环读取
while ((str = bufferedReader.readLine()) != null) {
//拼接
builder.append(str);
}
}
//返回
return builder.toString();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected void onPostExecute(String s) {
//创建gson对象
Gson gson = new Gson();
//解析gson串
GsonBean gsonBean = gson.fromJson(s, GsonBean.class);
//获取数据
result = gsonBean.getResult();
//遍历集合
for (int i = 0; i < result.size(); i++) {
lists = result.get(i);
//添加到新集合
list.addAll(lists);
}
//设置适配器
lv.setAdapter(new MAdapter());
super.onPostExecute(s);
}

@Override
protected void onProgressUpdate(Void... values) {
super.onProgressUpdate(values);
}
}
private class MAdapter extends BaseAdapter {
@Override
public int getCount() {
return list.size();
}

@Override
public Object getItem(int i) {
return list.get(i);
}

@Override
public long getItemId(int i) {
return i;
}

@Override
public View getView(int i, View view, ViewGroup viewGroup) {
ViewHolder holder;
String s = list.get(i);
if (view == null) {
view = View.inflate(getActivity(), android.R.layout.simple_list_item_1, null);
holder = new ViewHolder();
holder.text1 = (TextView) view.findViewById(android.R.id.text1);
view.setTag(holder);
} else {
holder = (ViewHolder) view.getTag();
}
holder.text1.setText(s);
return view;
}

class ViewHolder {
TextView text1;
}
}
//////////////////////////////////////
//创建网络请求方法
public boolean isNetworkConnected(Context context) {
if (context != null) {
ConnectivityManager mConnectivityManager = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo mNetworkInfo = mConnectivityManager.getActiveNetworkInfo();
if (mNetworkInfo != null) {
return mNetworkInfo.isAvailable();

}
}
return false;
}

///////////////////////////////////////
// 如果没有网络，则弹出网络设置对话框
public void checkNetwork(final Activity activity) {
if (!isNetworkConnected(activity)) {
TextView msg = new TextView(activity);
msg.setText("当前没有可以使用的网络，请设置网络！");
AlertDialog.Builder builder = new AlertDialog.Builder(activity);
builder.setTitle("网络状态提示")
.setView(msg)
.setPositiveButton("确定",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int whichButton) {
// 跳转到设置界面
activity.startActivityForResult(new Intent(
Settings.ACTION_WIRELESS_SETTINGS),
0);
}
}).setNegativeButton("取消", null).create().show();
}
return ;
}
}