接着上一篇：上一篇博客讲的是用百度地图的API制作 Marker 和 自定义的弹出框，这一篇则是讲对于百度地图的放大缩小控制：
老规矩先来张截图：
接下来一大波代码来袭。。。
package com.jsbtclient.cusViews;import com.baidu.mapapi.map.BaiduMap;import com.baidu.mapapi.map.MapStatus;import com.baidu.mapapi.map.MapStatusUpdateFactory;import com.baidu.mapapi.map.MapView;import com.example.jsbtclient.R;import android.content.Context;import android.util.AttributeSet;import android.view.LayoutInflater;import android.view.View;import android.widget.ImageView;import android.widget.LinearLayout;public class ZoomControlView extends LinearLayout implements View.OnClickListener{private MapView mapView;private BaiduMap baiduMap;//百度地图对象控制器private MapStatus mapStatus;//百度地图状态private ImageView zoomOut, zoomIn;private float MaxLevel;private float MinLevel;public ZoomControlView(Context context) {super(context);initZoomControlView(context);}public ZoomControlView(Context context, AttributeSet attr) {super(context, attr);initZoomControlView(context);}private void initZoomControlView(Context context) {LayoutInflater inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);View view = inflater.inflate(R.layout.zoom_control_layout, this);zoomIn = (ImageView) view.findViewById(R.id.zoom_control_plus);zoomOut = (ImageView) view.findViewById(R.id.zoom_control_reduce);zoomIn.setOnClickListener(this);zoomOut.setOnClickListener(this);}/** * set {@link MapView} */public void setMapView(MapView mapView){if(mapView != null){this.mapView = mapView;baiduMap = mapView.getMap();mapStatus = baiduMap.getMapStatus();MaxLevel = baiduMap.getMaxZoomLevel();MinLevel = baiduMap.getMinZoomLevel();}else{throw new NullPointerException("you should call setMapView(MapView mapView) at first");}}@Overridepublic void onClick(View view) {switch (view.getId()) {case R.id.zoom_control_plus:baiduMap.setMapStatus(MapStatusUpdateFactory.zoomIn());//放大break;case R.id.zoom_control_reduce:baiduMap.setMapStatus(MapStatusUpdateFactory.zoomOut());//缩小break;default:break;}mapStatus = mapView.getMap().getMapStatus();refreshZoomControlView();}private void refreshZoomControlView() {float zoom = mapStatus.zoom;if(zoom> MinLevel && zoom< MaxLevel){if(!zoomIn.isEnabled()){zoomIn.setEnabled(true); //设置为可点击}if(!zoomOut.isEnabled()){zoomOut.setEnabled(true);}}else if(zoom == MinLevel){zoomOut.setEnabled(false);zoomIn.setEnabled(true);}else{zoomIn.setEnabled(false);zoomOut.setEnabled(true);}}}
zoom_control_layout.xml
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android=""android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical" ><ImageViewandroid:id="@+id/zoom_control_plus"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_gravity="center_horizontal"android:layout_weight="1"android:contentDescription="@string/app_name"android:src="@drawable/zoomin_selector" /><ImageViewandroid:id="@+id/zoom_control_reduce"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_gravity="center_horizontal"android:layout_weight="1"android:contentDescription="@string/app_name"android:src="@drawable/zoomout_selector" /></LinearLayout>zoomin_selector.xml<?xml version="1.0" encoding="UTF-8"?><selector xmlns:android=""><item android:state_pressed="true" android:drawable="@drawable/zoomin_pressed"></item><item android:state_enabled="false" android:drawable="@drawable/zoomin_pressed"></item><item android:drawable="@drawable/zoomin_normal"></item></selector>zoomout_selector.xml
<?xml version="1.0" encoding="UTF-8"?><selector xmlns:android=""><item android:state_pressed="true" android:drawable="@drawable/zoomout_pressed"></item><item android:state_enabled="false" android:drawable="@drawable/zoomout_pressed"></item><item android:drawable="@drawable/zoomout_normal"></item></selector>代码很容易理解，大家自己看吧，用的话这样就可以zoomControlView = (ZoomControlView) view.findViewById(R.id.map_zoomcontrol);zoomControlView.setMapView(mapView);mapView.showZoomControls(false);//隐藏原生的控制按钮
，在旅途中，我遇见了你，你我相识是缘分！看着你手中的戒指，
