Android百度地图开发—定位显示以及自定义缩放功能（三）

ゝ一纸荒年。 2022-08-13 04:28 281阅读 0赞

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][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" >
        
       
       <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">
        
        
        <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> 
    	       <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;
    	
    	@Override
    	protected 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(){
    
    			@Override
    			public 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();
    	}
    	
    	@Override
    	public 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);
    	}
    	
    	@Override
    	public void onPause() {
    		mMapView.onPause();
    		super.onPause();
    	}
    
    	@Override
    	public void onResume() {
    		mMapView.onResume();
    		super.onResume();
    	}
    
    	@Override
    	public 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：

![Center][]![Center 1][]![Center 2][]

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。

[http_blog.csdn.net_smile5005_article_details_40023891]: http://blog.csdn.net/smile5005/article/details/40023891
[Center]: https://img-blog.csdn.net/20141012224340500?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvc21pbGU1MDA1/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center
[Center 1]: https://img-blog.csdn.net/20141012224607760?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvc21pbGU1MDA1/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center
[Center 2]: /images/20220810/caf38022fc5f4a0b8d93ef316d2b7cfc.png