Android判断网络状态方法详解

Android 判断网络状态这一应用技巧在实际应中是比较重要的。那么，在Android操作系统中，如何能够正确的判断我们所连接的网络是否断开恩？今天我们就针对这一应用技巧进行一个详细的分析。

	//注册一个广播接收者，接收网络连接状态改变广播
　public class ConnectionChangeReceiver extends BroadcastReceiver {
		@Override
		public void onReceive(Context context, Intent intent) {
			ConnectivityManager connectivityManager = (ConnectivityManager) context
					.getSystemService(Context.CONNECTIVITY_SERVICE);
			NetworkInfo activeNetInfo = connectivityManager
					.getActiveNetworkInfo();
			NetworkInfo mobNetInfo = connectivityManager
					.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
			if (activeNetInfo != null) {
				Toast.makeText(context,
						"Active Network Type : " + activeNetInfo.getTypeName(),
						Toast.LENGTH_SHORT).show();
			}
			if (mobNetInfo != null) {
				Toast.makeText(context,
						"Mobile Network Type : " + mobNetInfo.getTypeName(),
						Toast.LENGTH_SHORT).show();
			}
		}
	}

<!-- Needed to check when the network connection changes -->

	<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
	<receiver
		android:name="com.blackboard.androidtest.receiver.ConnectionChangeReceiver"
		android:label="NetworkConnection"> 
		<intent-filter> 
			<action android:name="android.net.conn.CONNECTIVITY_CHANGE"/> 
		</intent-filter>
	</receiver>

另一种方法：

	public boolean isNetworkAvailable() {
		Context context = getApplicationContext();
		ConnectivityManager connectivity = (ConnectivityManager) context
				.getSystemService(Context.CONNECTIVITY_SERVICE);
		if (connectivity == null) {
			boitealerte(this.getString(R.string.alert),
					"getSystemService rend null");
		} else {//获取所有网络连接信息
			NetworkInfo[] info = connectivity.getAllNetworkInfo();
			if (info != null) {//逐一查找状态为已连接的网络
				for (int i = 0; i < info.length; i++) {
					if (info[i].getState() == NetworkInfo.State.CONNECTED) {
						return true;
					}
				}
			}
		}
		return false;
	}

评论

1 楼 jesson02 2012-07-24  

android.net.conn.CONNECTIVITY_CHANGE
针对此系统广播所对应的属性，是不是只要网络连接状态发生改变，对应组件就会执行相应操作？

具体想知道，当网络断开时，是否执行接收广播的receiver