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

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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;

@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：







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。