高德地图八：手机定位和GPS定位

高德地图八：手机定位和GPS定位

高德地图八：手机定位和GPS定位

代码实现：
layout/activity_main.xml

com/example/administrator/MainActivity.java

package com.example.administrator;

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.app.ActivityCompat;
import android.view.View;
import android.widget.Button;
import android.widget.CompoundButton;
import android.widget.RadioButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.TextView;
import android.widget.Toast;


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

import java.util.ArrayList;

public class MainActivity extends Activity {
    private MapView mapView;
    private AMap aMap;
    private LocationManager locationManager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
        mapView = (MapView) findViewById(R.id.map);
        // 必须回调MapView的onCreate()方法
        mapView.onCreate(savedInstanceState);
        init();
        RadioButton rb = (RadioButton) findViewById(R.id.gps);
        // 为GPS单选按钮设置监听器
        rb.setOnCheckedChangeListener(new OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                // 如果该单选框已经被勾选
                if (isChecked) {
                    // 通过监听器监听GPS提供的定位信息的改变
                    if (ActivityCompat.checkSelfPermission(MainActivity.this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(MainActivity.this, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
                        // TODO: Consider calling
                        //    ActivityCompat#requestPermissions
                        // here to request the missing permissions, and then overriding
                        //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
                        //                                          int[] grantResults)
                        // to handle the case where the user grants the permission. See the documentation
                        // for ActivityCompat#requestPermissions for more details.
                        return;
                    }
                    locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 300, 8, new LocationListener() {
                        @Override
                        public void onLocationChanged(Location loc) {
                            // 使用GPS提供的定位信息来更新位置
                            updatePosition(loc);
                        }

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

                        @Override
                        public void onProviderEnabled(String provider) {
                            // 使用GPS提供的定位信息来更新位置
                            if (ActivityCompat.checkSelfPermission(MainActivity.this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(MainActivity.this, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
                                // TODO: Consider calling
                                //    ActivityCompat#requestPermissions
                                // here to request the missing permissions, and then overriding
                                //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
                                //                                          int[] grantResults)
                                // to handle the case where the user grants the permission. See the documentation
                                // for ActivityCompat#requestPermissions for more details.
                                return;
                            }
                            updatePosition(locationManager.getLastKnownLocation(provider));
                        }

                        @Override
                        public void onProviderDisabled(String provider) {
                        }
                    });
                }
            }
        });
        Button bn = (Button) findViewById(R.id.loc);
        final TextView latTv = (TextView) findViewById(R.id.lat);
        final TextView lngTv = (TextView) findViewById(R.id.lng);
        bn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // 获取用户输入的经度、纬度值
                String lng = lngTv.getEditableText().toString().trim();
                String lat = latTv.getEditableText().toString().trim();
                if (lng.equals("") || lat.equals("")) {
                    Toast.makeText(MainActivity.this, "请输入有效的经度、纬度!", Toast.LENGTH_SHORT).show();
                } else {
                    // 设置根据用户输入的地址定位
                    ((RadioButton) findViewById(R.id.manual)).setChecked(true);
                    double dLng = Double.parseDouble(lng);
                    double dLat = Double.parseDouble(lat);
                    // 将用户输入的经、纬度封装成LatLng
                    LatLng pos = new LatLng(dLat, dLng);  // ①
                    // 创建一个设置经纬度的CameraUpdate
                    CameraUpdate cu = CameraUpdateFactory.changeLatLng(pos);  // ②
                    // 更新地图的显示区域
                    aMap.moveCamera(cu);  // ③
                    // 创建MarkerOptions对象
                    MarkerOptions markerOptions = new MarkerOptions();
                    // 设置MarkerOptions的添加位置
                    markerOptions.position(pos);
                    // 设置MarkerOptions的标题
                    markerOptions.title("疯狂软件教育中心");
                    // 设置MarkerOptions的摘录信息
                    markerOptions.snippet("专业的Java、iOS培训中心");
                    // 设置MarkerOptions的图标
                    markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED));
                    markerOptions.draggable(true);
                    // 添加MarkerOptions（实际上就是添加Marker）
                    Marker marker = aMap.addMarker(markerOptions);
                    marker.showInfoWindow(); // 设置默认显示信息窗
                    // 创建MarkerOptions、并设置它的各种属性
                    MarkerOptions markerOptions1 = new MarkerOptions();
                    markerOptions1.position(new LatLng(dLat + 0.001, dLng))
                            // 设置标题
                            .title("疯狂软件教育中心学生食堂").icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_MAGENTA)).draggable(true);
                    // 使用集合封装多个图标，这样可为MarkerOptions设置多个图标
                    ArrayList giflist = new ArrayList<>();
                    giflist.add(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_BLUE));
                    giflist.add(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_GREEN));
                    giflist.add(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_YELLOW));
                    // 在创建一个MarkerOptions、并设置它的各种属性
                    MarkerOptions markerOptions2 = new MarkerOptions().position(new LatLng(dLat - 0.001, dLng))
                            // 为MarkerOptions设置多个图标
                            .icons(giflist).title("疯狂软件教育中心学生宿舍").draggable(true)
                            // 设置图标的切换频率
                            .period(10);
                    // 使用ArrayList封装多个MarkerOptions，即可一次添加多个Marker
                    ArrayList optionList = new ArrayList<>();
                    optionList.add(markerOptions1);
                    optionList.add(markerOptions2);
                    // 批量添加多个Marker
                    aMap.addMarkers(optionList, true);
                }
            }
        });
    }

    private void updatePosition(Location location) {
        LatLng pos = new LatLng(location.getLatitude(), location.getLongitude());
        // 创建一个设置经纬度的CameraUpdate
        CameraUpdate cu = CameraUpdateFactory.changeLatLng(pos);
        // 更新地图的显示区域
        aMap.moveCamera(cu);
        // 清除所有Marker等覆盖物
        aMap.clear();
        // 创建一个MarkerOptions对象
        MarkerOptions markerOptions = new MarkerOptions();
        markerOptions.position(pos);
        // 设置MarkerOptions使用自定义图标
        markerOptions.icon(BitmapDescriptorFactory.fromResource(R.drawable.car));
        markerOptions.draggable(true);
        // 添加MarkerOptions（实际上是添加Marker）
        Marker marker = aMap.addMarker(markerOptions);
    }

    // 初始化AMap对象
    private void init() {
        if (aMap == null) {
            aMap = mapView.getMap();
            // 创建一个设置放大级别的CameraUpdate
            CameraUpdate cu = CameraUpdateFactory.zoomTo(15);
            // 设置地图的默认放大级别
            aMap.moveCamera(cu);
            // 创建一个更改地图倾斜度的CameraUpdate
            CameraUpdate tiltUpdate = CameraUpdateFactory.changeTilt(30);
            // 改变地图的倾斜度
            aMap.moveCamera(tiltUpdate);
        }
    }

    @Override
    protected void onResume() {
        super.onResume();
        // 必须回调MapView的onResume()方法
        mapView.onResume();
    }

    @Override
    protected void onPause() {
        super.onPause();
        // 必须回调MapView的onPause()方法
        mapView.onPause();
    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        // 必须回调MapView的onSaveInstanceState()方法
        mapView.onSaveInstanceState(outState);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        // 必须回调MapView的onDestroy()方法
        mapView.onDestroy();
    }
}