先简单说一下思路:网络变化时系统会发出广播。所以我们监听这个广播,利用接口回调通知activity做相应的操作就好了。
思路
- 判断网络状态(写个工具类NetUtil)
- 写个类继承BroadcastReceiver(不要忘记在清单文件中注册)
- 需要在清单文件中添加权限
1
2
|
<uses-permission android:name= "android.permission.ACCESS_NETWORK_STATE" >
</uses-permission>
|
- 回调接口(NetEvevt)
- BaseActivity实现这个接口
直接上代码
NetUtil
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
|
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
/**
* Author: lenovo
* Date: 2018/2/26
* email: 1271396448@qq.com
*/
public class NetUtil {
/**
* 没有连接网络
*/
public static final int NETWORK_NONE = - 1 ;
/**
* 移动网络
*/
public static final int NETWORK_MOBILE = 0 ;
/**
* 无线网络
*/
public static final int NETWORK_WIFI = 1 ;
public static int getNetWorkState(Context context) {
// 得到连接管理器对象
ConnectivityManager connectivityManager = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetworkInfo = connectivityManager
.getActiveNetworkInfo();
if (activeNetworkInfo != null && activeNetworkInfo.isConnected()) {
if (activeNetworkInfo.getType() == (ConnectivityManager.TYPE_WIFI)) {
return NETWORK_WIFI;
} else if (activeNetworkInfo.getType() == (ConnectivityManager.TYPE_MOBILE)) {
return NETWORK_MOBILE;
}
} else {
return NETWORK_NONE;
}
return NETWORK_NONE;
}
}
|
NetBroadReceiver
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
|
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
/**
* Author: lenovo
* Date: 2018/2/26
* email: 1271396448@qq.com
*/
public class NetBroadcastReceiver extends BroadcastReceiver {
public NetEvevt evevt = BaseActivity.evevt;
@Override
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub
// 如果相等的话就说明网络状态发生了变化
if (intent.getAction().equals(ConnectivityManager.CONNECTIVITY_ACTION)) {
int netWorkState = NetUtil.getNetWorkState(context);
// 接口回调传过去状态的类型
evevt.onNetChange(netWorkState);
}
}
// 自定义接口
public interface NetEvevt {
public void onNetChange( int netMobile);
}
}
|
BaseActivity
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
|
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
/**
* Author: lenovo
* Date: 2018/2/26
* email: 1271396448@qq.com
*/
abstract public class BaseActivity extends FragmentActivity implements NetBroadcastReceiver.NetEvevt {
public static NetBroadcastReceiver.NetEvevt evevt;
/**
* 网络类型
*/
private int netMobile;
@Override
protected void onCreate(Bundle arg0) {
// TODO Auto-generated method stub
super .onCreate(arg0);
evevt = this ;
inspectNet();
}
/**
* 初始化时判断有没有网络
*/
public boolean inspectNet() {
this .netMobile = NetUtil.getNetWorkState(BaseActivity. this );
return isNetConnect();
// if (netMobile == 1) {
// System.out.println("inspectNet:连接wifi");
// } else if (netMobile == 0) {
// System.out.println("inspectNet:连接移动数据");
// } else if (netMobile == -1) {
// System.out.println("inspectNet:当前没有网络");
//
// }
}
/**
* 网络变化之后的类型
*/
@Override
public void onNetChange( int netMobile) {
// TODO Auto-generated method stub
this .netMobile = netMobile;
isNetConnect();
}
/**
* 判断有无网络 。
*
* @return true 有网, false 没有网络.
*/
public boolean isNetConnect() {
if (netMobile == 1 ) {
return true ;
} else if (netMobile == 0 ) {
return true ;
} else if (netMobile == - 1 ) {
return false ;
}
return false ;
}
}
|
MainActivity
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
|
import android.os.Bundle;
import android.view.View;
import android.widget.ListView;
import android.widget.TextView;
public class MainActivity extends BaseActivity {
private TextView textView,txtView;
ListView listView; //声明一个ListView对象
@Override
protected void onCreate(Bundle savedInstanceState) {
super .onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textView= (TextView) findViewById(R.id.textView);
txtView=(TextView) this .findViewById(R.id.txtView);
//启动时判断网络状态
boolean netConnect = this .isNetConnect();
if (netConnect){
textView.setVisibility(View.GONE);
txtView.setText( "网络连接正常" );
} else {
textView.setVisibility(View.VISIBLE);
txtView.setText( "网络连接异常" );
}
}
@Override
public void onNetChange( int netMobile) {
super .onNetChange(netMobile);
//网络状态变化时的操作
if (netMobile==NetUtil.NETWORK_NONE){
textView.setVisibility(View.VISIBLE);
txtView.setText( "网络连接异常" );
} else {
textView.setVisibility(View.GONE);
txtView.setText( "网络连接正常" );
}
}
}
|
记得在清单文件中注册
1
2
3
4
5
|
< receiver android:name = "cn.broadcastreceiver.NetBroadcastReceiver" >
< intent-filter >
< action android:name = "android.net.conn.CONNECTIVITY_CHANGE" />
</ intent-filter >
</ receiver >
|
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:https://blog.csdn.net/qq1271396448/article/details/79373163