判断网络

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

// 获取连接管理器
ConnectivityManager cn = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);
// 获取当前网络信息对象
NetworkInfo info = cn.getActiveNetworkInfo();

if (info != null && info.isAvailable() && info.isConnected()) {
// 获取网络类型
int type = info.getType();
if (type == ConnectivityManager.TYPE_WIFI) {
Toast.makeText(this, "WIFE网络可用", 0).show();
} else if (type == ConnectivityManager.TYPE_MOBILE) {
Toast.makeText(this, "手机网络可用", 0).show();
}
} else {
Toast.makeText(this, "网络不可用", 0).show();

}
}