Java Android GooglePlayServices上下文错误

我正在尝试对我的android应用程序进行Google play服务检查。 我在这个链接上遵循了yt指南： 并创建了以下代码：

public boolean servicesOK() {
    int isAvailable = GooglePlayServicesUtil.isGooglePlayServicesAvailable(this);

    if (isAvailable == ConnectionResult.SUCCESS) {
        return true;
    }
    else if (GooglePlayServicesUtil.isUserRecoverableError(isAvailable)) {
        Dialog dialog = GooglePlayServicesUtil.getErrorDialog(isAvailable, this, GPS_ERRORDIALOG_REQUEST);
        dialog.show();
    }
    else {
        Toast.makeText(this, "Can't connect to Google Play services", Toast.LENGTH_SHORT).show();
    }
    return false;
}

代码执行正确，没有任何问题，因此我决定将其放入类文件中。那就是问题发生的时候；我收到以下错误消息：

"The method isGooglePlayServicesAvailable(Context) in the type GooglePlayServicesUtil is not applicable for the arguments (PlayServices)"

该类的完整代码：

package com.test.testmaps2;
import android.app.Dialog;
import android.widget.Toast;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesUtil;

public class PlayServices {
private static final int GPS_ERRORDIALOG_REQUEST = 9001;


public boolean servicesOK() {
    int isAvailable = GooglePlayServicesUtil.isGooglePlayServicesAvailable(this);

    if (isAvailable == ConnectionResult.SUCCESS) {
        return true;
    }
    else if (GooglePlayServicesUtil.isUserRecoverableError(isAvailable)) {
        Dialog dialog = GooglePlayServicesUtil.getErrorDialog(isAvailable, this, GPS_ERRORDIALOG_REQUEST);
        dialog.show();
    }
    else {
        Toast.makeText(this, "Can't connect to Google Play services", Toast.LENGTH_SHORT).show();
    }
    return false;
}

---

}

错误提示您需要将上下文传递给iGoogle PlayServicesAvailable。为此，您可能希望获取上下文作为servicesOK方法的参数：

public boolean servicesOK(Context ctx) {
    int isAvailable = GooglePlayServicesUtil.isGooglePlayServicesAvailable(ctx);

然后从活动中调用此方法，如：

servicesOK(this);