Android 检查手机网络是否可用

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>

public void checkNet(View v){
        if(isNetworkConnected(this)){
            Toast.makeText(this, "网络可用",Toast.LENGTH_SHORT).show();
        }else{
            Toast.makeText(this, "网络不可用",Toast.LENGTH_SHORT).show();
        }
    }
    //检查网络状态
    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;
    }