Android初级开发（十）——百度定位—在地图上显示你的位置

来源：互联网发布：马三娘骑马知乎编辑：程序博客网时间：2024/05/21 21:37

在上一篇的基础上进行开发
一、布局文件
使用了LBS提供的地图View控件

<?xml version="1.0" encoding="utf-8"?><LinearLayout    xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical">    <TextView        android:id="@+id/position_text_view"        android:layout_width="wrap_content"        android:layout_height="0dp"        android:layout_weight="1"/>    <com.baidu.mapapi.map.MapView        android:id="@+id/bmapView"        android:layout_width="match_parent"        android:layout_height="0dp"        android:layout_weight="5"        android:clickable="true"/></LinearLayout>

二、MainActivity.java

public class MainActivity extends AppCompatActivity {    public LocationClient mLoacationClient;    private TextView positionText;    private MapView mapView;    private BaiduMap baiduMap;    private boolean isFirstLocation = true;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        //创建一个LocationClient的实例，接受一个Context参数        mLoacationClient = new LocationClient(getApplicationContext());        //调用LocationClient的registerLocationListener()方法注册一个定位监听器        //当获取到位置信息时，就会回调这个定位监听器        mLoacationClient.registerLocationListener(new MyLocationListener());        SDKInitializer.initialize(getApplicationContext());        setContentView(R.layout.activity_main);        positionText = (TextView) findViewById(R.id.position_text_view);        mapView = (MapView) findViewById(R.id.bmapView);        baiduMap = mapView.getMap();        baiduMap.setMyLocationEnabled(true);        //创建一个空的List集合        //依次判断这3个权限有没有被授权，如果没有被授权就添加到List集合中        List<String> permissionList = new ArrayList<>();        if(ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.ACCESS_FINE_LOCATION)!= PackageManager.PERMISSION_GRANTED){            permissionList.add(Manifest.permission.ACCESS_FINE_LOCATION);        }        if(ContextCompat.checkSelfPermission(MainActivity.this,Manifest.permission.READ_PHONE_STATE)!=PackageManager.PERMISSION_GRANTED){            permissionList.add(Manifest.permission.READ_PHONE_STATE);        }        if(ContextCompat.checkSelfPermission(MainActivity.this,Manifest.permission.WRITE_EXTERNAL_STORAGE)!=PackageManager.PERMISSION_GRANTED){            permissionList.add(Manifest.permission.WRITE_EXTERNAL_STORAGE);        }        //将List转换成数据        //调用ActivityCompat。requestPermissions()方法一次性申请        if(!permissionList.isEmpty()){            String[] permissions = permissionList.toArray(new String[permissionList.size()]);            ActivityCompat.requestPermissions(MainActivity.this,permissions,1);        }else{            requestLocation();        }    }    //开始地理位置定位    private void requestLocation() {        //更新地理位置        initLocation();        //调用LocationClient的start()方法开始定位        //定位的结果会回调到前面注册的监听器中        mLoacationClient.start();    }    private void initLocation() {        //创建一个LocationClientOption对象        LocationClientOption option = new LocationClientOption();        //设置更新的间隔，单位毫秒        option.setScanSpan(5000);        //表示我们需要获取当前位置的详细地址信息        option.setIsNeedAddress(true);        mLoacationClient.setLocOption(option);    }    @Override    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {        switch (requestCode){            case 1:                if(grantResults.length > 0){                    for(int result : grantResults){                        if(result != PackageManager.PERMISSION_GRANTED){                            Toast.makeText(this, "必须同意所有权限才能使用本程序", Toast.LENGTH_SHORT).show();                            finish();                            return;                        }                    }                    requestLocation();                }else {                    Toast.makeText(this, "发生未知错误", Toast.LENGTH_SHORT).show();                    finish();                }                break;            default:        }    }    private void navigateTo(BDLocation location){        //第一次定位时让地图定位到我们当前位置        //之后地图上显示的位置随设备的移动而实时改变        if(isFirstLocation){            //LatLng类主要是用于存放经纬度的值            //第一个参数是纬度值，第二个参数是经度值            LatLng ll = new LatLng(location.getLatitude(),location.getLongitude());            MapStatusUpdate update = MapStatusUpdateFactory.newLatLng(ll);            baiduMap.animateMapStatus(update);            //设置地图的缩放级别，zoomTo()方法接受一个float型的参数            update = MapStatusUpdateFactory.zoomTo(16f);            baiduMap.animateMapStatus(update);            isFirstLocation = false;        }        //添加MyLocationData的构建逻辑，将Location中包含的经度和纬度封装到MyLocationData.Builder中        MyLocationData.Builder locationBuilder = new MyLocationData.Builder();        locationBuilder.latitude(location.getLatitude());        locationBuilder.longitude(location.getLatitude());        MyLocationData locationData = locationBuilder.build();        baiduMap.setMyLocationData(locationData);    }    public class MyLocationListener implements BDLocationListener{        @Override        public void onReceiveLocation(BDLocation location) {            StringBuilder currentPosition = new StringBuilder();            currentPosition.append("纬度：").append(location.getLatitude());            currentPosition.append("经线：").append(location.getLongitude());            currentPosition.append("省：").append(location.getProvince());            currentPosition.append("市：").append(location.getCity());            currentPosition.append("区：").append(location.getDistrict());            currentPosition.append("街道：").append(location.getStreet());            currentPosition.append("定位方式：");            if(location.getLocType() == BDLocation.TypeGpsLocation){                currentPosition.append("GPS");            }else if(location.getLocType() == BDLocation.TypeNetWorkLocation){                currentPosition.append("网络");            }            positionText.setText(currentPosition);            navigateTo(location);        }    }    @Override    protected void onResume() {        super.onResume();        mapView.onResume();    }    @Override    protected void onPause() {        super.onPause();        mapView.onPause();    }    @Override    protected void onDestroy() {        super.onDestroy();        //当活动被销毁的时候调用LocationClient的stop()方法来停止定位        mLoacationClient.stop();        mapView.onDestroy();        baiduMap.setMyLocationEnabled(false);    }}

三、效果图
这里写图片描述

没有出现小光标显示出我的位置，问题出在哪里还要继续看一下。。。

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