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;
}