您的位置：首页 > 理论基础 > 计算机网络

利用广播机制判断当前网络状态

2016-06-01 09:14 561 查看
日常的应用中，我们常常需要监听当前的网络状态，这个时候我们常常用到的是广播机智

intentFilter = new IntentFilter();
intentFilter.addAction("android.net.conn.CONNECTIVITY_CHANGE");
netWorkChangeReceiver = new NetWorkChangeReceiver();
registerReceiver(netWorkChangeReceiver, intentFilter);


网络状态改变的监听

class NetWorkChangeReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
ConnectivityManager connectionManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo netWorkInfo = connectionManager.getActiveNetworkInfo();
if (netWorkInfo != null && netWorkInfo.isAvailable()) {
if (netWorkInfo.getType() == ConnectivityManager.TYPE_MOBILE) {
Toast.makeText(context, "当前网络是3G", Toast.LENGTH_LONG).show();
} else if (netWorkInfo.getType() == ConnectivityManager.TYPE_WIFI) {
Toast.makeText(context, "当前网络是Wifi", Toast.LENGTH_SHORT).show();
}
} else {
Toast.makeText(context, "网络不可用", Toast.LENGTH_SHORT).show();
}
}
}


在程序销毁的时候要将广播一块销毁

protected void onDestroy() {
super.onDestroy();
unregisterReceiver(netWorkChangeReceiver);
}


还有一点不能忘记，我们在判断当前网络状态是否改变的时候，需要获取网络监听的权限，这一点很重要，也很容易忽视。如果不添加获取网络的权限的话，程序在运行的过程中会直接崩溃。

当然我们也可以将这些封成工具类，然后直接调用

/**
* Created by cxz on 2016/5/31 0031.
*/
public class NetworkProber {

/**
* 网络是否可用
*
* @param context
* @return
*/
public static boolean isNetworkAvailable(Context context) {
ConnectivityManager connectivity = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
if (connectivity == null) {
} else {
NetworkInfo[] info = connectivity.getAllNetworkInfo();
if (info != null) {
for (int i = 0; i < info.length; i++) {
if (info[i].getState() == NetworkInfo.State.CONNECTED) {
return true;
}
}
}
}
return false;
}

/**
* Gps是否打开
*
* @param context
* @return
*/
public static boolean isGpsEnabled(Context context) {
LocationManager locationManager = ((LocationManager) context
.getSystemService(Context.LOCATION_SERVICE));
List<String> accessibleProviders = locationManager.getProviders(true);
return accessibleProviders != null && accessibleProviders.size() > 0;
}

/**
* wifi是否打开
*/
public static boolean isWifiEnabled(Context context) {
ConnectivityManager mgrConn = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
TelephonyManager mgrTel = (TelephonyManager) context
.getSystemService(Context.TELEPHONY_SERVICE);
return ((mgrConn.getActiveNetworkInfo() != null && mgrConn
.getActiveNetworkInfo().getState() == NetworkInfo.State.CONNECTED) || mgrTel
.getNetworkType() == TelephonyManager.NETWORK_TYPE_UMTS);
}

/**
* 判断当前网络是否是wifi网络
* if(activeNetInfo.getType()==ConnectivityManager.TYPE_MOBILE) { //判断3G网
*
* @param context
* @return boolean
*/
public static boolean isWifi(Context context) {
ConnectivityManager connectivityManager = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetInfo = connectivityManager.getActiveNetworkInfo();
if (activeNetInfo != null
&& activeNetInfo.getType() == ConnectivityManager.TYPE_WIFI) {
return true;
}
return false;
}

/**
* 判断当前网络是否是3G网络
*
* @param context
* @return boolean
*/
public static boolean is3G(Context context) {
ConnectivityManager connectivityManager = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetInfo = connectivityManager.getActiveNetworkInfo();
if (activeNetInfo != null
&& activeNetInfo.getType() == ConnectivityManager.TYPE_MOBILE) {
return true;
}
return false;
}

//另外还有两个方法判断网络是否可用：
public static boolean isNetworkAvailable_00(Context context) {
ConnectivityManager cm = ((ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE));
if (cm != null) {
NetworkInfo info = cm.getActiveNetworkInfo();
if (info != null && info.isConnectedOrConnecting()) {
return true;
}
}
return false;
}

public static boolean isNetworkAvailable_01(Context context) {
ConnectivityManager cm = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo network = cm.getActiveNetworkInfo();
if (network != null) {
return network.isAvailable();
}
return false;
}

// 更加严谨的写法：
public static boolean checkNet(Context context) {

try {
ConnectivityManager connectivity = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
if (connectivity != null) {

NetworkInfo info = connectivity.getActiveNetworkInfo();
if (info != null && info.isConnected()) {

if (info.getState() == NetworkInfo.State.CONNECTED) {
return true;
}
}
}
} catch (Exception e) {
return false;
}
return false;
}
}
内容来自用户分享和网络整理，不保证内容的准确性，如有侵权内容，可联系管理员处理 点击这里给我发消息
标签：  广播 网络监听 网络改变 3G Wifi
相关文章推荐
新的分享
章节导航