android 网络判断是否可用

首先判断网络是否打开：

    private boolean NetWorkStatus() {

        // TODO Auto-generated method stub

        ConnectivityManager cwjManager = (ConnectivityManager) mActivity

                .getSystemService(Context.CONNECTIVITY_SERVICE);

        cwjManager.getActiveNetworkInfo();

        boolean netSataus = true;

        if (cwjManager.getActiveNetworkInfo() != null) {

            netSataus = cwjManager.getActiveNetworkInfo().isAvailable();

            Toast.makeText(mActivity, "网络已经打开", Toast.LENGTH_LONG).show();
        } else {

             //如果没有连接网络，并打开设置页面，进行网络设置

            AlertDialog.Builder builder=new Builder(mActivity);

            builder.setTitle("网络设置提示").setMessage("网络连接不可用,是否进行设置?").setPositiveButton("设置", new DialogInterface.OnClickListener() {

                

                @Override

                public void onClick(DialogInterface dialog, int which) {

                    // TODO Auto-generated method stub

                    Intent intent=null;

                    //判断手机系统的版本  即API大于10 就是3.0或以上版本

                    if(android.os.Build.VERSION.SDK_INT>10){

                        intent = new Intent(android.provider.Settings.ACTION_WIRELESS_SETTINGS);

                    }else{

                        intent = new Intent();

                        ComponentName component = new ComponentName("com.android.settings","com.android.settings.WirelessSettings");

                        intent.setComponent(component);

                        intent.setAction("android.intent.action.VIEW");

                    }

                    mActivity.startActivity(intent);

                }

            }).setNegativeButton("取消", new DialogInterface.OnClickListener() {

                

                @Override

                public void onClick(DialogInterface dialog, int which) {

                    // TODO Auto-generated method stub

                    dialog.dismiss();

                }

            }).show();

        }

        return netSataus;

    }