BroadcastReceiver广播监听android网络状态

用BroadcastReceiver广播监听判断android手机网络状态。

一、新建Receiver类继承BroadcastReceiver

public class ConnectReceiver extends BroadcastReceiver{    @Override    public void onReceive(Context context, Intent intent) {        ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);        NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();        if(networkInfo!=null && networkInfo.getType()== ConnectivityManager.TYPE_WIFI){            Toast.makeText(context,"now is wifi",Toast.LENGTH_SHORT).show();        }        else if(networkInfo!=null && networkInfo.getType()== ConnectivityManager.TYPE_MOBILE){            Toast.makeText(context,"now is 移动数据",Toast.LENGTH_SHORT).show();        }        else{            Toast.makeText(context,"没有网络",Toast.LENGTH_SHORT).show();        }    }}

二、AndroidMainfest.xml静态注册Receiver类，注意添加网络权限

三、监听处理，注意在onDestroy()里取消广播接收器的注册

public class MainActivity extends AppCompatActivity {    private ConnectReceiver connectReceiver;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        IntentFilter intentFilter = new IntentFilter();        intentFilter.addAction("android.net.conn.CONNECTIVITY_CHANGE");        connectReceiver = new ConnectReceiver();        registerReceiver(connectReceiver,intentFilter);    }    @Override    protected void onDestroy() {        unregisterReceiver(connectReceiver);        super.onDestroy();    }}

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