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package cc.testnetworkchange;import android.os.Bundle;import android.app.Activity;/** * Demo描述: * 利用广播监听设备网络连接的变化情况 * 亦可借此监测到设备是否已经断开网络 */public class MainActivity extends Activity {	@Override	protected void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentView(R.layout.main);	}}

NetWorkChangeBroadcastReceiver如下:

package cc.testnetworkchange;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.net.ConnectivityManager;import android.net.NetworkInfo;import android.net.NetworkInfo.State;public class NetWorkChangeBroadcastReceiver extends BroadcastReceiver {	@Override	public void onReceive(Context context, Intent intent) {		ConnectivityManager connectivityManager=		(ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);		if (connectivityManager!=null) {			NetworkInfo [] networkInfos=connectivityManager.getAllNetworkInfo();			for (int i = 0; i < networkInfos.length; i++) {				State state=networkInfos[i].getState();				if (NetworkInfo.State.CONNECTED==state) {					System.out.println("------------> Network is ok");					return;				}			}		}				//没有执行return,则说明当前无网络连接		System.out.println("------------> Network is validate");		intent.setClass(context, NetWorkErrorActivity.class);		intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP|Intent.FLAG_ACTIVITY_NEW_TASK);        context.startActivity(intent);	}}

package cc.testnetworkchange;import android.os.Bundle;import android.app.Activity;public class NetWorkErrorActivity extends Activity {	@Override	protected void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentView(R.layout.networkerror);	}}

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