ConnectivityManager类网络状态判断设置+BaseActivity和BaseFragment的封装使用+网络状态工具类+网络请求工具类
一. MainActivity.java
package androidthree_1509d.connect; import android.widget.RelativeLayout; import base.BaseActivity; import fragment.NewsFrament; public class MainActivity extends BaseActivity { private RelativeLayout relativeLayout; @Override protected int getLayoutId() { return R.layout.activity_main; } @Override protected void initView() { //找到控件 relativeLayout = (RelativeLayout) findViewById(R.id.relative_layout); } @Override protected void initData() { //使用fragment替换布局的显示 getSupportFragmentManager().beginTransaction().replace(R.id.relative_layout,new NewsFrament()).commit(); } }
二. adapter包下的自定义适配器类：
package adapter;
import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
import java.util.List;
public class NewsAdapter extends BaseAdapter {
Context context;
List> list;
public NewsAdapter(Context context, List> list) {
this.context = context;
this.list = list;
}
@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) {
if (view == null){
view = View.inflate(context,android.R.layout.simple_list_item_1,null);
}
TextView textView = view.findViewById(android.R.id.text1);
textView.setText(list.get(i).get(0)+"----"+list.get(i).get(1));
return view;
}
}
三. base包下的自定义Activity和Fragment类：
1. BaseActivity.java
package base;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
public abstract class BaseActivity extends AppCompatActivity {
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(getLayoutId());
initView();
initData();
}
//获取资源文件的id
protected abstract int getLayoutId();
//初始化展示的视图
protected abstract void initView();
//初始化数据
protected abstract void initData();
}
2. BaseFragment.java
package base;
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;
public abstract class BaseFragment extends Fragment {
private View view;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
view = initView(inflater,container);
return view;
}
//初始化视图
protected abstract View initView(LayoutInflater inflater, ViewGroup container);
@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
initData();
super.onActivityCreated(savedInstanceState);
}
//初始化数据
protected abstract void initData();
}
四. bean包下的数据封装类
五. fragment包下的自定义Fragment类：
package fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListView;
import com.google.gson.Gson;
import java.util.List;
import adapter.NewsAdapter;
import base.BaseFragment;
import bean.DataDataBean;
import internet.NetInfoCallBack;
import util.GetDataUtil;
import util.NetWorkUtil;
import androidthree_1509d.connect.R;
public class NewsFrament extends BaseFragment {
private ListView listView;
@Override
protected View initView(LayoutInflater inflater, ViewGroup container) {
View view = inflater.inflate(R.layout.news_fragment_layout, container, false);
listView = view.findViewById(R.id.list_view);
return view;
}
@Override
protected void initData() {
//获取网络数据,,,,填充到listView...获取之前网络判断
if (NetWorkUtil.isNetworkConnected(getActivity())){//可用
GetDataUtil.getDataFromNet("https://suggest.taobao.com/sug?code=utf-8&q=%E6%98%BE%E7%A4%BA%E5%99%A8", new NetInfoCallBack() {
@Override
public void getSuccessString(String string) {
//获取到了数据...json
Gson gson = new Gson();
DataDataBean dataDataBean = gson.fromJson(string, DataDataBean.class);
List> list = dataDataBean.getResult();
//设置适配器
NewsAdapter newsAdapter = new NewsAdapter(getActivity(), list);
listView.setAdapter(newsAdapter);
}
});
}else {
NetWorkUtil.showNoNetWorkDlg(getActivity());
}
}
}
六. Internet包下的自定义获取网络状态信息的接口类：
package internet; public interface NetInfoCallBack { public void getSuccessString(String string); }
七. util包下的自定义的工具类：
1. GetDataUtil.java
package util;
import android.os.AsyncTask;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import internet.NetInfoCallBack;
public class GetDataUtil {
public static void getDataFromNet(final String path, final NetInfoCallBack netInfoCallBack){
AsyncTask asyncTask = new AsyncTask() {
@Override
protected String doInBackground(Void... voids) {
try {
URL url = new URL(path);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
//设置
connection.setRequestMethod("GET");
connection.setReadTimeout(5000);
connection.setConnectTimeout(5000);
//获取
int responseCode = connection.getResponseCode();
if (responseCode == 200){
InputStream inputStream = connection.getInputStream();
//转换为字符串
String s = StringUtil.streamToString(inputStream, "utf-8");
return s;
}
} catch (Exception e) {
e.printStackTrace();
}
return "";
}
@Override
protected void onPostExecute(String json) {
netInfoCallBack.getSuccessString(json);
}
};
asyncTask.execute();
}
}
2. NetWorkUtil.java
package util;
import androidthree_1509d.connect.R;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
public class NetWorkUtil {
/**
* 判断是否有网络连接.....http://www.jianshu.com/p/10ed9ae02775
* @param context
* @return
*/
public static boolean isNetworkConnected(Context context) {
if (context != null) {
// 获取手机所有连接管理对象(包括对wi-fi,net等连接的管理)
ConnectivityManager manager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
// 获取NetworkInfo对象
NetworkInfo networkInfo = manager.getActiveNetworkInfo();
//判断NetworkInfo对象是否为空
if (networkInfo != null)
return networkInfo.isAvailable();
}
return false;
}
/**
* 网络无连接时跳转页面.....http://blog.csdn.net/cy524563/article/details/41686735
* @param context
*/
public static void showNoNetWorkDlg(final Context context) {
AlertDialog.Builder builder = new AlertDialog.Builder(context);
builder.setTitle(R.string.app_name)
.setMessage("网络连接不可用，是否去设置？")
.setPositiveButton("确定", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// 跳转到系统的网络设置界面
Intent intent = null;
// 先判断当前系统版本
if(android.os.Build.VERSION.SDK_INT > 10){ // 3.0以上
intent = new Intent(android.provider.Settings.ACTION_WIRELESS_SETTINGS);
}else{
intent = new Intent();
intent.setClassName("com.android.settings", "com.android.settings.WirelessSettings");
}
context.startActivity(intent);
}
})
.setNegativeButton("取消", null)
.show();
}
}
3. StringUtil.java
package util;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
public class StringUtil {
public static String streamToString(InputStream inputStream, String charset) {
try {
InputStreamReader inputStreamReader = new InputStreamReader(inputStream,charset);
BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
String s = null;
StringBuilder builder = new StringBuilder();
while ((s = bufferedReader.readLine()) != null){
builder.append(s);
}
bufferedReader.close();
return builder.toString();
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
}
八. res 文件夹下的布局文件：
1. activity_main.xml
xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/relative_layout" android:layout_width="match_parent" android:layout_height="match_parent"> RelativeLayout>
2. fragment_layout.xml
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:id="@+id/list_view"
android:layout_width="match_parent"
android:layout_height="match_parent">
ListView>
LinearLayout>
九. 在AndroidMainifest.xml中添加
1. 网络请求权限：
<uses-permission android:name="android.permission.INTERNET">uses-permission>
2. 判断网络状态的权限：
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE">uses-permission>