API 23及之后版本关于用android studio 中LocationManager的方法使用

package com.example.administrator.locationtest;

import android.app.Activity;
import android.content.Context;
import android.content.pm.PackageManager;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.support.v4.content.ContextCompat;
import android.widget.TextView;
import android.widget.Toast;

import org.w3c.dom.Text;

import java.util.List;
import java.util.jar.Manifest;

/**
* Created by Administrator on 2016/4/8.
*/
public class MainActivity extends Activity{
private TextView positionTextView;
private LocationManager locationManager;
private String provider;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
positionTextView=(TextView)findViewById(R.id.position_text_view);
locationManager=(LocationManager)getSystemService(Context.LOCATION_SERVICE);
if(ContextCompat.checkSelfPermission(this,android.Manifest.permission.ACCESS_FINE_LOCATION)== PackageManager.PERMISSION_GRANTED){

//此处的判定是主要问题，API23之后需要先判断之后才能调用locationManager中的方法

//包括这里的getLastKnewnLocation方法和requestLocationUpdates方法
Location location=locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if(location!=null){
showLocation(location);
}
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,5000,10,locationListener);
}
}
@Override
protected void onDestroy() {
super.onDestroy();
if(ContextCompat.checkSelfPermission(this,android.Manifest.permission.ACCESS_FINE_LOCATION)== PackageManager.PERMISSION_GRANTED){

//此处同样需要判定之后才能调用removeUpdates方法
if(locationManager!=null){
locationManager.removeUpdates(locationListener);
}
}
}
LocationListener locationListener=new LocationListener() {
@Override
public void onLocationChanged(Location location) {
showLocation(location);
}

@Override
public void onStatusChanged(String provider, int status, Bundle extras) {

}

@Override
public void onProviderEnabled(String provider) {

}

@Override
public void onProviderDisabled(String provider) {

}
};
private void showLocation(Location location){
String currentPosition="latitude is"+location.getLatitu
4000
de()+"\n"+"longitude is"+location.getLongitude();
positionTextView.setText(currentPosition);
}
}