APP 开启时询问是否开启定位功能

效果图如下

import android.app.Activity;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;

import android.location.LocationManager;
import android.provider.Settings;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;


public class MainActivity extends AppCompatActivity {


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        openGPSSettings();//GPS 弹窗
    }

      private boolean checkGPSIsOpen() {
        boolean isOpen;
        LocationManager locationManager = (LocationManager) this
                .getSystemService(Context.LOCATION_SERVICE);
        isOpen = locationManager.isProviderEnabled(android.location.LocationManager.GPS_PROVIDER);
        return isOpen;
      }


    private void openGPSSettings() {
        if (!checkGPSIsOpen()) {
            //没有打开则弹出对话框
            AlertDialog.Builder dialog = new AlertDialog.Builder(this);
            dialog.setTitle("提示");
            dialog.setMessage("打开定位功能可以提高精度哟");
            dialog.setCancelable(false);//不能用返回关闭
            // 拒绝, 退出应用
            dialog.setNegativeButton("取消", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    Activity activity=new Activity();
                    System.exit(0);
                }
            });
            dialog.setPositiveButton("开启定位",
                    new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            //跳转GPS设置界面
                            Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
                            startActivity(intent);
                        }
                    });
            dialog.show();

        }
    }


}