很多小伙伴对高德地图开发应该很熟悉,毕竟高德文档已经说得很清楚了,关于如何接入和配置我这里就不在细说了。下面给大家讲一下实现定位的简单优化
一、AndroidManifest.xml文件
二、layout布局代码
上面的配置都是按官方文档来,下面的就是不同的,也就是简单优化的
三、首先声明一个接口MapUtilsInter,继承LocationSource和AMapLocationListener这两个接口,主要负责设置定位资源和监听。
/**
* Created by Andream on 2018/12/10/010.
* 高德地图配置定位接口接口
*/
public interface MapUtilsInter extends LocationSource, AMapLocationListener {
/**
* 设置定义样式
* @return MyLocationStyle
*/
MyLocationStyle getMyLocationStyle();
/**
* activity销毁时销毁资源
*/
void destroy();
}
四、定义MapUtils类实现MapUtilsInter以及接口的方法,主要看注释
**
* Created by Andream on 2018/12/9/009.
* 高德地图定位参数设置
*/
public class MapUtils implements MapUtilsInter{
private AMapLocationClient mLocationClient;
private LocationSource.OnLocationChangedListener mListener;
private Context context;
public MapUtils(Context context) {
this.context = context;
}
public MyLocationStyle getMyLocationStyle(){
MyLocationStyle myLocationStyle;
myLocationStyle = new MyLocationStyle();//初始化定位蓝点样式类myLocationStyle.myLocationType(MyLocationStyle.LOCATION_TYPE_LOCATION_ROTATE);//连续定位、且将视角移动到地图中心点,定位点依照设备方向旋转,并且会跟随设备移动。(1秒1次定位)如果不设置myLocationType,默认也会执行此种模式。
myLocationStyle.interval(2000); //设置连续定位模式下的定位间隔,只在连续定位模式下生效,单次定位模式下不会生效。单位为毫秒。
myLocationStyle.myLocationType(MyLocationStyle.LOCATION_TYPE_FOLLOW);
myLocationStyle.radiusFillColor(0x00000000);
myLocationStyle.strokeColor(0x00000000);
return myLocationStyle;
}
@Override
public void onLocationChanged(AMapLocation aMapLocation) {
if (mListener != null && aMapLocation != null) {
if (aMapLocation.getErrorCode() == 0) {
//在这里获取定位参数,如经纬度等
mListener.onLocationChanged(aMapLocation);// 显示系统小蓝点
} else {
String errText = "定位失败," + aMapLocation.getErrorCode() + ": " + aMapLocation.getErrorInfo();
Log.e("AmapErr", errText);
}
}
}
@Override
public void activate(OnLocationChangedListener onLocationChangedListener) {
mListener = onLocationChangedListener;
if (mLocationClient == null) {
mLocationClient = new AMapLocationClient(context);
AMapLocationClientOption mLocationOption = new AMapLocationClientOption();
//设置定位监听
mLocationClient.setLocationListener(this);
//设置为高精度定位模式
mLocationOption.setLocationMode(AMapLocationClientOption.AMapLocationMode.Hight_Accuracy);
//设置定位参数
mLocationClient.setLocationOption(mLocationOption);
// 此方法为每隔固定时间会发起一次定位请求,为了减少电量消耗或网络流量消耗,
// 注意设置合适的定位时间的间隔(最小间隔支持为2000ms),并且在合适时间调用stopLocation()方法来取消定位请求
// 在定位结束后,在合适的生命周期调用onDestroy()方法
// 在单次定位情况下,定位无论成功与否,都无需调用stopLocation()方法移除请求,定位sdk内部会移除
mLocationClient.startLocation();
}
}
@Override
public void deactivate() {
mListener = null;
if (mLocationClient != null) {
mLocationClient.stopLocation();
mLocationClient.onDestroy();
}
mLocationClient = null;
}
/**
* 退出销毁资源
*/
public void destroy(){
mListener = null;
if (mLocationClient != null) {
mLocationClient.stopLocation();
mLocationClient.onDestroy();
}
mLocationClient = null;
}
}
六、activity实现,主要采用MVC模式,调用MapUtilsInter实现方式是多态
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
private MapView mMapView = null;
private AMap aMap;
private MapUtilsInter mapUtils = new MapUtils(this);
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initPermission();
//获取地图控件引用
//在activity执行onCreate时执行mMapView.onCreate(savedInstanceState),创建地图
mMapView = findViewById(R.id.map);
mMapView.onCreate(savedInstanceState);
aMap = mMapView.getMap();
aMap.moveCamera(CameraUpdateFactory.zoomTo(16));//设置大小
initMap();
}
/**
* 定位初始化
*/
private void initMap() {
aMap.setMyLocationStyle(mapUtils.getMyLocationStyle());//设置定位蓝点的Style
aMap.setLocationSource(mapUtils);
aMap.getUiSettings().setMyLocationButtonEnabled(true);//设置默认定位按钮是否显示,非必需设置。
aMap.setMyLocationEnabled(true);// 设置为true表示启动显示定位蓝点,false表示隐藏定位蓝点并不进行定位,默认是false。
}
@Override
protected void onDestroy() {
super.onDestroy();
//在activity执行onDestroy时执行mMapView.onDestroy(),销毁地图
mMapView.onDestroy();
mapUtils.destroy();
}
@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);
}
/**
* android 6.0 以上需要动态申请权限
*/
private void initPermission() {
String[] permissions = {
Manifest.permission.VIBRATE,
Manifest.permission.WAKE_LOCK,
Manifest.permission.ACCESS_COARSE_LOCATION,
Manifest.permission.ACCESS_FINE_LOCATION,
Manifest.permission.ACCESS_NETWORK_STATE,
Manifest.permission.CHANGE_WIFI_STATE,
Manifest.permission.INTERNET,
Manifest.permission.WRITE_EXTERNAL_STORAGE,
Manifest.permission.ACCESS_LOCATION_EXTRA_COMMANDS,
Manifest.permission.READ_PHONE_STATE,
Manifest.permission.VIBRATE,
Manifest.permission.CAMERA,
};
ArrayList toApplyList = new ArrayList();
for (String perm : permissions) {
if (PackageManager.PERMISSION_GRANTED != ContextCompat.checkSelfPermission(this, perm)) {
toApplyList.add(perm);
// 进入到这里代表没有权限.
}
}
String[] tmpList = new String[toApplyList.size()];
if (!toApplyList.isEmpty()) {
ActivityCompat.requestPermissions(this, toApplyList.toArray(tmpList), 123);
}
}
}
上面就是我的优化,主要好处就是避免了activity过于臃肿,方便维护。