Android初级开发（十）——百度定位—在地图上显示你的位置

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

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。。。