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判断手机是否连接网络

附上一张效果图（网络状态为true代表联网成功，false则联网失败）

1.添加一些需要的权限

1  <uses-permission android:name="android.permission.INTERNET"/>
2 <!--允许读取网络状态-->
3 <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
4 <!--允许读取wifi网络状态-->
5 <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
6 
7 <uses-permission android:name="android.permission.CHANGE_NETWORK_STATE"/>
8 
9 <uses-permission android:name="android.permission.WRITE_SETTINGS"/>

2.判断手机是否联网（这里返回的是boolean型）

//判断手机是否有网络
    public static boolean isOnline() {
        URL url;
        try {
            url = new URL("https://www.baidu.com");
            URLConnection conn = url.openConnection();
            conn.setConnectTimeout(500);
            InputStream inputStream = conn.getInputStream();
            return true;
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (Exception a){
            a.printStackTrace();
        }
        return false;
    }

3.判断当前网络的类型（返回的值是int型的）

 1 /*
 2     * 获取当前网络的类型
 3     * 0 没有网络
 4     * 1 WIFI网络
 5     * 2 2G网络
 6     * 3 3G网络
 7     * 4 4G网络
 8     */
 9     public static int getAPNType(Context context){
10         //结果返回值
11         int netType = 0;
12         //获取手机所有连接管理对象
13         ConnectivityManager manager = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
14         //获取NetWorkinfo对象
15         NetworkInfo info = manager.getActiveNetworkInfo();
16         //NetworkInfo对象为空，则代表没有网络
17         if(info == null){
18             return netType;
19         }
20         //否则NetworkInfo对象不为空，则获取该NetworkInfo的类型
21         int nType = info.getType();
22         if(nType == ConnectivityManager.TYPE_WIFI){
23             netType = 1; //WIFI
24         }else if(nType == ConnectivityManager.TYPE_MOBILE){
25             int nSubType = info.getSubtype();
26             TelephonyManager telephonyManager = (TelephonyManager)context.getSystemService(Context.TELEPHONY_SERVICE);
27 
28             if(nSubType == TelephonyManager.NETWORK_TYPE_LTE && !telephonyManager.isNetworkRoaming()){
29                 netType = 4; //4G网络
30             }else if(nSubType == TelephonyManager.NETWORK_TYPE_UMTS
31                     || nSubType == TelephonyManager.NETWORK_TYPE_HSDPA
32                     || nSubType == TelephonyManager.NETWORK_TYPE_EVDO_0
33                     && !telephonyManager.isNetworkRoaming()){
34 
35                 netType = 3; //联通的3G为UMTS或HSDPA 电信的3G为EVDO
36 
37             }else if(nSubType == TelephonyManager.NETWORK_TYPE_GPRS
38                     || nSubType == TelephonyManager.NETWORK_TYPE_EDGE
39                     || nSubType == TelephonyManager.NETWORK_TYPE_CDMA
40                     && !telephonyManager.isNetworkRoaming()){
41 
42                 netType = 2; //2G
43 
44             }else{
45                 netType = 2;
46             }
47         }
48         return netType;
49     }

我把它们写成封装类，方便以后调用

  1 public class Connections {
  2 
  3     /*
  4     * 判断网络类型
  5     * 值为1 -- WIFI
  6     * 值为0 -- 手机数据网络
  7     * 值为-1 - 断开网络（不包含以上两者）
  8     */
  9     public static int getConnectedType(Context context){
 10         if(context != null){
 11             ConnectivityManager manager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
 12             NetworkInfo info = manager.getActiveNetworkInfo();
 13             if(info != null && info.isAvailable()){
 14                 return info.getType();
 15             }
 16         }
 17         return  -1;
 18     }
 19 
 20     /*
 21     * 判断网络状态
 22     * 有网 - true
 23     * 没网 - false
 24     */
 25     public static boolean isConnectInternet(Context context){
 26         if(context != null){
 27             //获取手机所有连接管理对象（包括WIFI，NET等连接的管理）
 28             ConnectivityManager manager = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
 29             //获取NetworkInfo对象
 30             NetworkInfo info = manager.getActiveNetworkInfo();
 31             //判断NetworkInfo对象是否为空，并且类型是否为MOBILE
 32             if(info != null){
 33                 return info.isAvailable();
 34             }
 35         }
 36         return false;
 37     }
 38 
 39     /*
 40      * 判断MOBIL网络是否可用
 41      */
 42     public static boolean isMobileConnected(Context context){
 43         if(context != null){
 44             //获取手机所有连接管理对象（包括WIFI，NET等连接的管理）
 45             ConnectivityManager manager = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
 46             //获取NetworkInfo对象
 47             NetworkInfo info = manager.getActiveNetworkInfo();
 48             //判断NetworkInfo对象是否为空，并且类型是否为MOBILE
 49             if(info != null && info.getType() == manager.TYPE_MOBILE){
 50                 return info.isAvailable();
 51             }
 52         }
 53         return false;
 54     }
 55 
 56     /*
 57     * 获取当前网络的类型
 58     * 0 没有网络
 59     * 1 WIFI网络
 60     * 2 2G网络
 61     * 3 3G网络
 62     * 4 4G网络
 63     */
 64     public static int getAPNType(Context context){
 65         //结果返回值
 66         int netType = 0;
 67         //获取手机所有连接管理对象
 68         ConnectivityManager manager = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
 69         //获取NetWorkinfo对象
 70         NetworkInfo info = manager.getActiveNetworkInfo();
 71         //NetworkInfo对象为空，则代表没有网络
 72         if(info == null){
 73             return netType;
 74         }
 75         //否则NetworkInfo对象不为空，则获取该NetworkInfo的类型
 76         int nType = info.getType();
 77         if(nType == ConnectivityManager.TYPE_WIFI){
 78             netType = 1; //WIFI
 79         }else if(nType == ConnectivityManager.TYPE_MOBILE){
 80             int nSubType = info.getSubtype();
 81             TelephonyManager telephonyManager = (TelephonyManager)context.getSystemService(Context.TELEPHONY_SERVICE);
 82 
 83             if(nSubType == TelephonyManager.NETWORK_TYPE_LTE && !telephonyManager.isNetworkRoaming()){
 84                 netType = 4; //4G网络
 85             }else if(nSubType == TelephonyManager.NETWORK_TYPE_UMTS
 86                     || nSubType == TelephonyManager.NETWORK_TYPE_HSDPA
 87                     || nSubType == TelephonyManager.NETWORK_TYPE_EVDO_0
 88                     && !telephonyManager.isNetworkRoaming()){
 89 
 90                 netType = 3; //联通的3G为UMTS或HSDPA 电信的3G为EVDO
 91 
 92             }else if(nSubType == TelephonyManager.NETWORK_TYPE_GPRS
 93                     || nSubType == TelephonyManager.NETWORK_TYPE_EDGE
 94                     || nSubType == TelephonyManager.NETWORK_TYPE_CDMA
 95                     && !telephonyManager.isNetworkRoaming()){
 96 
 97                 netType = 2; //2G
 98 
 99             }else{
100                 netType = 2;
101             }
102         }
103         return netType;
104     }
105 
106     //判断手机是否有网络
107     public static boolean isOnline() {
108         URL url;
109         try {
110             url = new URL("https://www.baidu.com");
111             URLConnection conn = url.openConnection();
112             conn.setConnectTimeout(500);
113             InputStream inputStream = conn.getInputStream();
114             return true;
115         } catch (MalformedURLException e) {
116             e.printStackTrace();
117         } catch (Exception a){
118             a.printStackTrace();
119         }
120         return false;
121     }
122 
123 
124 }

然后附上效果图的MainActivity类，布局文件就不加了

  1 public class MainActivity extends AppCompatActivity implements View.OnClickListener{
  2     private TextView tv_status,tv_type;
  3     private Button btnTest;
  4     private String TAG = "DEBUG";
  5     private Handler handler = new Handler();
  6     private ProgressDialog dialog;
  7 
  8     @Override
  9     protected void onCreate(Bundle savedInstanceState) {
 10         super.onCreate(savedInstanceState);
 11         setContentView(R.layout.activity_main);
 12         initView();
 13     }
 14 
 15     private void initView(){
 16         btnTest = (Button)findViewById(R.id.btnTest);
 17         tv_type = (TextView)findViewById(R.id.net_type);
 18         tv_status = (TextView)findViewById(R.id.net_status);
 19         btnTest.setOnClickListener(this);
 20         btnTest.setVisibility(View.GONE);
 21         initNetWork();
 22         initDialog();
 23     }
 24 
 25 
 26     @Override
 27     public void onClick(View view) {
 28         dialog.show();
 29         handler.postDelayed(new Runnable() {
 30             @Override
 31             public void run() {
 32                 dialog.dismiss();
 33                 initNetWork();
 34                 initDialog();
 35                 boolean status = Connections.isOnline();
 36                 if(status == true){
 37                     Toast.makeText(MainActivity.this, "网络连接成功", Toast.LENGTH_SHORT).show();
 38                 }else{
 39                     Toast.makeText(MainActivity.this, "网络连接失败", Toast.LENGTH_SHORT).show();
 40                 }
 41             }
 42         },2000); //耗时2秒
 43     }
 44 
 45     /*
 46      * 0 没有网络
 47      * 1 WIFI网络
 48      * 2 2G网络
 49      * 3 3G网络
 50      * 4 4G网络
 51      */
 52    private void initNetType(){
 53        final int type = Connections.getAPNType(this);
 54        runOnUiThread(new Runnable() {
 55            @Override
 56            public void run() {
 57                switch (type){
 58                    case 0:
 59                        tv_type.setText("没有网络");
 60                        break;
 61                    case 1:
 62                        tv_type.setText("WIFI网络");
 63                        break;
 64                    case 2:
 65                        tv_type.setText("2G网络");
 66                        break;
 67                    case 3:
 68                        tv_type.setText("3G网络");
 69                        break;
 70                    case 4:
 71                        tv_type.setText("4G网络");
 72                        break;
 73                    default:
 74                        tv_type.setText("其他网络");
 75                        break;
 76                }
 77            }
 78        });
 79    }
 80 
 81    private void initNetWork(){
 82        ConnectivityManager manager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
 83        manager.requestNetwork(new NetworkRequest.Builder().build(), new ConnectivityManager.NetworkCallback(){
 84            @Override
 85            public void onLost(@NonNull Network network) {
 86                super.onLost(network);
 87                //网络不可用
 88                Log.d(TAG, "网络不可用" + Connections.isOnline());
 89                runUi(Connections.isOnline());
 90            }
 91 
 92            @Override
 93            public void onAvailable(@NonNull Network network) {
 94                super.onAvailable(network);
 95                //网络可用
 96                Log.d(TAG, "网络可用" + Connections.isOnline());
 97                runUi(Connections.isOnline());
 98            }
 99        });
100    }
101 
102    private void runUi(final boolean status){
103         runOnUiThread(new Runnable() {
104             @Override
105             public void run() {
106                 tv_status.setText(String.valueOf(status));
107                 if(status == false){
108                     btnTest.setVisibility(View.VISIBLE);
109                 }else{
110                     btnTest.setVisibility(View.GONE);
111                 }
112                 Log.d(TAG, "状态：" + status);
113             }
114         });
115        initNetType();
116    }
117 
118    //加载Dialog
119     private void initDialog(){
120         dialog = new ProgressDialog(this);
121         dialog.setIndeterminate(false); //循环滚动
122         dialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
123         dialog.setMessage("网络重新连接中...");
124         dialog.setCancelable(false); //false不能取消显示，true可以取消显示
125     }
126 }

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原文地址：https://www.cnblogs.com/Mr-Deng/p/11578025.html