android 网络状态监听

主页面：

public class MainActivity extends Activity {
public static final String CONNECTIVITY_CHANGE_ACTION = "android.net.conn.CONNECTIVITY_CHANGE";
MyReceiver mr = new MyReceiver();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
registerDateTransReceiver();

if(Utils.getActiveNetwork(MainActivity.this)==null){
Toast.makeText(this, "没有网络！", Toast.LENGTH_LONG).show();
}else{
Toast.makeText(this, "网络良好！", Toast.LENGTH_LONG).show();
}

}

private void registerDateTransReceiver() {
Log.i("TAG", "register receiver " + CONNECTIVITY_CHANGE_ACTION);
IntentFilter filter = new IntentFilter();
filter.addAction(CONNECTIVITY_CHANGE_ACTION);
filter.setPriority(1000);
registerReceiver(mr, filter);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public void onBackPressed() {
// TODO Auto-generated method stub
super.onBackPressed();
unregisterReceiver(mr);
finish();

}
}

工具类：

public static final String CONNECTIVITY_CHANGE_ACTION = "android.net.conn.CONNECTIVITY_CHANGE";
MyReceiver mr = new MyReceiver();
public static NetworkInfo getActiveNetwork(Context context){
if (context == null)
return null;
ConnectivityManager mConnMgr = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
if (mConnMgr == null)
return null;
NetworkInfo aActiveInfo = mConnMgr.getActiveNetworkInfo(); // 获取活动网络连接信息
return aActiveInfo;
}
MyRecevier:

public class MyReceiver extends BroadcastReceiver {
public static final String CONNECTIVITY_CHANGE_ACTION = "android.net.conn.CONNECTIVITY_CHANGE";
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
Log.i("TAG", "PfDataTransReceiver receive action " + action);
if(TextUtils.equals(action, CONNECTIVITY_CHANGE_ACTION)){//网络变化的时候会发送通知
Log.i("TAG", "网络变化了");
return;
}
}
}

最后在mainfaintext,xml文件中添加权限：

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