扣丁学堂——网络是否连接 网络概述

public class MainActivity extends ActionBarActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    public void checkNetClick(View view) {
        boolean bool = isNetworkConnected(this);
        if (bool) {
            Toast.makeText(this, "网络可用", Toast.LENGTH_SHORT).show();
        } else {
            Toast.makeText(this, "网络不可用", Toast.LENGTH_SHORT).show();
        }
    }

    //检查网络是否可用
    public boolean isNetworkConnected(Context context) {
        if (context != null) {
            ConnectivityManager mConnectivityManager = (ConnectivityManager)
                    context.getSystemService(Context.CONNECTIVITY_SERVICE);

            NetworkInfo mNetworkInfo = mConnectivityManager.getActiveNetworkInfo();
            if (mNetworkInfo != null) {
                return mNetworkInfo.isAvailable();
            }
        }
        return false;
    }

    //判断WIFI网络是否可用 
    public boolean isWifiConnected(Context context) {
        if (context != null) {
            ConnectivityManager mConnectivityManager = (ConnectivityManager)
                    context.getSystemService(Context.CONNECTIVITY_SERVICE);
            NetworkInfo mWiFiNetworkInfo = mConnectivityManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
            if (mWiFiNetworkInfo != null) {
                return mWiFiNetworkInfo.isAvailable();
            }
        }
        return false;
    }

    //判断MOBILE网络是否可用
    public boolean isMobileConnected(Context context) {
        if (context != null) {
            ConnectivityManager mConnectivityManager = (ConnectivityManager)
                    context.getSystemService(Context.CONNECTIVITY_SERVICE);
            NetworkInfo mMobileNetworkInfo = mConnectivityManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
            if (mMobileNetworkInfo != null) {
                return mMobileNetworkInfo.isAvailable();
            }
        }
        return false;
    }

    //获取当前网络连接的类型信息
    public static int getConnectedType(Context context) {
        if (context != null) {
            ConnectivityManager mConnectivityManager = (ConnectivityManager)
                    context.getSystemService(Context.CONNECTIVITY_SERVICE);
            NetworkInfo mNetworkInfo=mConnectivityManager.getActiveNetworkInfo();
            if (mNetworkInfo != null && mNetworkInfo.isAvailable()){
                return mNetworkInfo.getType();
            }
        }
        return -1;
    }
}