Android 检查网络连接状态

1.ConnectionDetector.java

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;

public class ConnectionDetector {

	private Context _context;

	public ConnectionDetector(Context context) {
		this._context = context;
	}

	/**
	 * 判断网络是否连接
	 * 
	 * @return true/false
	 */
	public boolean isConnectingToInternet() {
		ConnectivityManager connectivity = (ConnectivityManager) _context
				.getSystemService(Context.CONNECTIVITY_SERVICE);
		if (connectivity != null) {
			NetworkInfo[] info = connectivity.getAllNetworkInfo();
			if (info != null) {
				for (int i = 0; i < info.length; i++) {
					if (info[i].getState() == NetworkInfo.State.CONNECTED) {
						return true;
					}
				}
			}
		}
		return false;
	}
}

2.调用

	private void checkWangLuo() {
		ConnectionDetector cd = new ConnectionDetector(getApplicationContext()); 
		Boolean isInternetPresent = cd.isConnectingToInternet(); 
		if(!isInternetPresent){
			
		}
	}