Android端 高德地图点击得到经纬度

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_select_point"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.euphemiaxiao.feedback.selectPoint">

    <com.amap.api.maps.MapView
        android:id="@+id/map"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_above="@+id/doneSelect">
    </com.amap.api.maps.MapView>

    <Button
        android:text="确认选点"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/doneSelect"
        android:background="@android:color/holo_blue_light"
        android:textSize="18sp"
        android:layout_centerHorizontal="true"
        android:layout_alignParentBottom="true"/>

</RelativeLayout>

package com.example.euphemiaxiao.feedback;

import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;

import com.amap.api.maps.AMap;
import com.amap.api.maps.CameraUpdateFactory;
import com.amap.api.maps.MapView;
import com.amap.api.maps.model.BitmapDescriptorFactory;
import com.amap.api.maps.model.LatLng;
import com.amap.api.maps.model.MarkerOptions;

public class selectPoint extends AppCompatActivity implements AMap.OnMapClickListener{
    private Button doneSelect;
    private MapView mMapView = null;
    private AMap aMap = null;
    double latitude;
    double longtitude;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_select_point);

        //获取地图控件引用
        mMapView = (MapView) findViewById(R.id.map);
        //在activity执行onCreate时执行mMapView.onCreate(savedInstanceState)，创建地图
        mMapView.onCreate(savedInstanceState);
        init();

        doneSelect = (Button)findViewById(R.id.doneSelect);
        doneSelect.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(selectPoint.this,Feedback.class);
                intent.putExtra("latitude",latitude);
                intent.putExtra("longtitude",longtitude);
                startActivity(intent);
            }
        });
    }
    private void init() {
        if (aMap == null) {
            aMap = mMapView.getMap();
            setUpMap();
        }
    }

    private void setUpMap() {
        aMap.showIndoorMap(true);
        LatLng latLng = new LatLng(39.92448, 116.518295);
        aMap.moveCamera(CameraUpdateFactory.changeLatLng(latLng));//设置中心点
        aMap.moveCamera(CameraUpdateFactory.zoomTo(18)); // 设置地图可视缩放大小
        aMap.setOnMapClickListener(this);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        //在activity执行onDestroy时执行mMapView.onDestroy()，销毁地图
        mMapView.onDestroy();
    }
    @Override
    protected void onResume() {
        super.onResume();
        //在activity执行onResume时执行mMapView.onResume ()，重新绘制加载地图
        mMapView.onResume();
    }
    @Override
    protected void onPause() {
        super.onPause();
        //在activity执行onPause时执行mMapView.onPause ()，暂停地图的绘制
        mMapView.onPause();
    }
    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        //在activity执行onSaveInstanceState时执行mMapView.onSaveInstanceState (outState)，保存地图当前的状态
        mMapView.onSaveInstanceState(outState);
    }

    @Override
    public void onMapClick(LatLng latLng) {
        aMap.clear();
        latitude=latLng.latitude;
        longtitude=latLng.longitude;
        MarkerOptions markerOptions = new MarkerOptions();
        markerOptions.icon(BitmapDescriptorFactory.fromResource(R.drawable.placeholder));
        markerOptions.position(latLng);
        aMap.addMarker(markerOptions);
        aMap.moveCamera(CameraUpdateFactory.changeLatLng(latLng));
    }
}