Android百度地图开发—定位显示以及自定义缩放功能（三）

                                  Android百度地图开发—定位显示自定义缩放功能

     转载请注明：http://blog.csdn.net/smile5005/article/details/40023891

     本文使用的百度地图接口是v3.0版本，利用该接口可以定位当前所处位置，并在百度地图上进行显示，同时鉴于原始Demo中百度地图放大缩小按钮不够美观，故对其进行自定义显示。接下来，我们一步步的实现：

1、首先定义布局文件：

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"     android:orientation="vertical" >       <!-- 显示百度地图的View -->   <com.baidu.mapapi.map.MapView           android:id="@+id/bmapView"     android:layout_width="fill_parent"     android:layout_height="fill_parent" />       <RelativeLayout          android:layout_width="match_parent"    android:layout_height="match_parent"     android:orientation="vertical">        <!-- 切换显示模式-->    <Button        android:id="@+id/btn_map_mode"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentBottom="true"        android:layout_alignParentLeft="true"        android:layout_marginLeft="5dip"         android:layout_marginBottom="50dip" />       <LinearLayout       android:layout_width="wrap_content"       android:layout_height="wrap_content"       android:layout_alignParentBottom="true"       android:layout_alignParentRight="true"       android:layout_alignWithParentIfMissing="false"       android:layout_marginBottom="50dip"       android:layout_marginRight="10dip"       android:orientation="vertical" >       <span style="font-size:18px;">          </span> <!-- 地图的放大缩小-->       <Button           android:id="@+id/btn_zoom_in"           android:layout_width="fill_parent"           android:layout_height="fill_parent"           android:layout_marginLeft="2dip"           android:layout_marginRight="2dip"           android:layout_weight="1.0"           android:background="@drawable/zoom_in"/>              <Button           android:id="@+id/btn_zoom_out"           android:layout_width="fill_parent"           android:layout_height="fill_parent"           android:layout_marginLeft="2dip"           android:layout_marginRight="2dip"           android:layout_weight="1.0"           android:background="@drawable/zoom_out"/>    </LinearLayout>      </RelativeLayout>   </RelativeLayout>

2：接下来在Activity中进行显示，代码如下：

package com.mr.blogtest;import com.baidu.location.BDLocation;import com.baidu.mapapi.map.BaiduMap;import com.baidu.mapapi.map.BitmapDescriptor;import com.baidu.mapapi.map.MapStatusUpdate;import com.baidu.mapapi.map.MapStatusUpdateFactory;import com.baidu.mapapi.map.MapView;import com.baidu.mapapi.map.MyLocationConfiguration;import com.baidu.mapapi.map.MyLocationData;import com.baidu.mapapi.map.MyLocationConfiguration.LocationMode;import com.baidu.mapapi.model.LatLng;import com.mr.baidu.LocationHelper;import com.mr.baidu.LocationHelper.OnLocationListener;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.ZoomControls;public class MainActivity extends Activity implements OnLocationListener {private MapView  mMapView=null;private BaiduMap mBaiduMap = null;private LocationHelper mLocationHelper;private LocationMode mCurrentMode;private Button mRequestLocButton;private BitmapDescriptor mCurrentMarker=null;private boolean mIsFirstLoc=true;private Button mZoomInButton;private Button mZoomOutButton;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);initView();initData();}private void initView(){mMapView=(MapView)findViewById(R.id.bmapView);//隐藏放大缩小控件;如果需要隐藏其他控件可采用同样方式.int childCount = mMapView.getChildCount();        View zoom = null;        for (int i = 0; i < childCount; i++) {           View child = mMapView.getChildAt(i);           if (child instanceof ZoomControls) {                   zoom = child;                   break;           }        }        zoom.setVisibility(View.GONE);        mRequestLocButton=(Button)findViewById(R.id.btn_map_mode);mZoomInButton=(Button)findViewById(R.id.btn_zoom_in);mZoomOutButton=(Button)findViewById(R.id.btn_zoom_out);}private void initData(){mCurrentMode = LocationMode.NORMAL;mRequestLocButton.setText("普通");mBaiduMap=mMapView.getMap();OnClickListener btnClickListener = new OnClickListener(){@Overridepublic void onClick(View v) {if(v.equals(mRequestLocButton)){performMode();}else if(v.equals(mZoomInButton)){performZoomIn();}else if(v.equals(mZoomOutButton)){performZoomOut();}}};mRequestLocButton.setOnClickListener(btnClickListener);mZoomInButton.setOnClickListener(btnClickListener);mZoomOutButton.setOnClickListener(btnClickListener);// 开启定位图层,定位初始化;mBaiduMap.setMyLocationEnabled(true);//打开交通状况图;mBaiduMap.setTrafficEnabled(true);//开始定位，此定位帮助类是对百度定位的封装，可以参照之前的Blog;mLocationHelper=new LocationHelper(this);mLocationHelper.setOnLocationListener(this);mLocationHelper.start();}@Overridepublic void onReceiveLocation(BDLocation location) {// map view 销毁后不在处理新接收的位置if (location == null || mMapView == null)return;//在百度地图上进行定位数据显示;MyLocationData locData = new MyLocationData.Builder().accuracy(location.getRadius())// 此处设置开发者获取到的方向信息，顺时针0-360.direction(100).latitude(location.getLatitude()).longitude(location.getLongitude()).build();mBaiduMap.setMyLocationData(locData);if (mIsFirstLoc) {mIsFirstLoc = false;LatLng ll = new LatLng(location.getLatitude(),location.getLongitude());MapStatusUpdate u = MapStatusUpdateFactory.newLatLng(ll);mBaiduMap.animateMapStatus(u);}}/** * 处理显示模式; */private void performMode(){switch (mCurrentMode) {case NORMAL:mRequestLocButton.setText("跟随");mCurrentMode = LocationMode.FOLLOWING;mBaiduMap.setMyLocationConfigeration(new MyLocationConfiguration(mCurrentMode, true, mCurrentMarker));break;case COMPASS:mRequestLocButton.setText("普通");mCurrentMode = LocationMode.NORMAL;mBaiduMap.setMyLocationConfigeration(new MyLocationConfiguration(mCurrentMode, true, mCurrentMarker));break;case FOLLOWING:mRequestLocButton.setText("罗盘");mCurrentMode = LocationMode.COMPASS;mBaiduMap.setMyLocationConfigeration(new MyLocationConfiguration(mCurrentMode, true, mCurrentMarker));break;}}/** * 处理放大; */private void performZoomIn(){float zoomMaxLevel=mBaiduMap.getMaxZoomLevel();float zoomLevel=mBaiduMap.getMapStatus().zoom;zoomLevel++;if(zoomLevel>zoomMaxLevel){zoomLevel=zoomMaxLevel;}MapStatusUpdate u = MapStatusUpdateFactory.zoomTo(zoomLevel);mBaiduMap.animateMapStatus(u);}/** * 处理缩小; */private void performZoomOut(){float zoomMinLevel=mBaiduMap.getMinZoomLevel();float zoomLevel=mBaiduMap.getMapStatus().zoom;zoomLevel--;if(zoomLevel<zoomMinLevel){zoomLevel=zoomMinLevel;}MapStatusUpdate u = MapStatusUpdateFactory.zoomTo(zoomLevel);mBaiduMap.animateMapStatus(u);}@Overridepublic void onPause() {mMapView.onPause();super.onPause();}@Overridepublic void onResume() {mMapView.onResume();super.onResume();}@Overridepublic void onDestroy() {mBaiduMap.setMyLocationEnabled(false);mLocationHelper.stop();mMapView.onDestroy();mMapView = null;super.onDestroy();}}

3、最后显示的结果如下所示：

 

 好了，今天就写到这里了，如果有什么不妥之处,可以在下方留言,敬请各位多多赐教。