BaiduMap---百度地图官方Demo之地图操作功能（介绍地图基本控制方法）

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="50dip"
        android:orientation="horizontal" >

        <Button
            android:id="@+id/zoombutton"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="缩放" />

        <EditText
            android:id="@+id/zoomlevel"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="10" />

        <Button
            android:id="@+id/rotatebutton"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="旋转" />

        <EditText
            android:id="@+id/rotateangle"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="90" />

        <Button
            android:id="@+id/overlookbutton"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="俯视" />

        <EditText
            android:id="@+id/overlookangle"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="-30" />
    </LinearLayout>

    <TextView
        android:id="@+id/state"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:lines="3"
        android:text="点击、长按、双击地图以获取经纬度和地图状态" />

    <RelativeLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:orientation="vertical" >

        <com.baidu.mapapi.map.MapView
            android:id="@+id/bmapView"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:clickable="true" />

        <Button
            android:id="@+id/savescreen"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:layout_alignParentTop="true"
            android:layout_marginTop="10dip"
            android:text="截图" />
    </RelativeLayout>

</LinearLayout>

/**
 * 演示地图缩放，旋转，视角控制
 * 介绍地图基本控制方法
 */
public class MapControlDemo extends Activity {

    /**
     * MapView 是地图主控件
     */
    private MapView mMapView;
    private BaiduMap mBaiduMap;

    /**
     * 当前地点击点
     */
    private LatLng currentPt;
    /**
     * 控制按钮
     */
    private Button zoomButton;
    private Button rotateButton;
    private Button overlookButton;
    private Button saveScreenButton;

    private String touchType;

    /**
     * 用于显示地图状态的面板
     */
    private TextView mStateBar;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_mapcontrol);
        mMapView = (MapView) findViewById(R.id.bmapView);
        mBaiduMap = mMapView.getMap();
        mStateBar = (TextView) findViewById(R.id.state);
        initListener();
    }

    private void initListener() {
        /**
         *setOnMapTouchListener(BaiduMap.OnMapTouchListener listener):
         *                        设置触摸地图事件监听者
         * */
        mBaiduMap.setOnMapTouchListener(new OnMapTouchListener() {
            //当用户触摸地图时回调函数
            @Override
            public void onTouch(MotionEvent event) {
                
            }
        });
        
        /**
         * setOnMapClickListener(BaiduMap.OnMapClickListener listener):
         *                     设置地图单击事件监听者
         * */
        mBaiduMap.setOnMapClickListener(new OnMapClickListener() {
            //地图单击事件回调函数
            public void onMapClick(LatLng point) {
                touchType = "单击";
                currentPt = point;
                updateMapState();
            }
            //地图内 Poi 单击事件回调函数
            //MapPoi:点击地图 Poi 点时，该兴趣点的描述信息
            public boolean onMapPoiClick(MapPoi poi) {
                return false;
            }
        });
        
        /**
         * setOnMapLongClickListener(BaiduMap.OnMapLongClickListener listener):
         *                     设置地图长按事件监听者
         * */
        mBaiduMap.setOnMapLongClickListener(new OnMapLongClickListener() {
            //地图长按事件监听回调函数
            public void onMapLongClick(LatLng point) {
                touchType = "长按";
                currentPt = point;
                updateMapState();
            }
        });
        
        /**
         * setOnMapDoubleClickListener(BaiduMap.OnMapDoubleClickListener listener):
         *                     设置地图双击事件监听者
         * */
        mBaiduMap.setOnMapDoubleClickListener(new OnMapDoubleClickListener() {
            //地图双击事件监听回调函数
            public void onMapDoubleClick(LatLng point) {
                touchType = "双击";
                currentPt = point;
                updateMapState();
            }
        });
        
        /**
         *setOnMapStatusChangeListener(BaiduMap.OnMapStatusChangeListener listener):
         *                     设置地图状态监听者
         * */
        mBaiduMap.setOnMapStatusChangeListener(new OnMapStatusChangeListener() {
            //手势操作地图，设置地图状态等操作导致地图状态开始改变。
            public void onMapStatusChangeStart(MapStatus status) {
                updateMapState();
            }
            //地图状态改变结束
            public void onMapStatusChangeFinish(MapStatus status) {
                updateMapState();
            }
            //地图状态变化中
            public void onMapStatusChange(MapStatus status) {
                updateMapState();
            }
        });
        
        zoomButton = (Button) findViewById(R.id.zoombutton);
        rotateButton = (Button) findViewById(R.id.rotatebutton);
        overlookButton = (Button) findViewById(R.id.overlookbutton);
        saveScreenButton = (Button) findViewById(R.id.savescreen);
        OnClickListener onClickListener = new OnClickListener() {
            @Override
            public void onClick(View view) {
                if (view.equals(zoomButton)) {
                    perfomZoom();
                } else if (view.equals(rotateButton)) {
                    perfomRotate();
                } else if (view.equals(overlookButton)) {
                    perfomOverlook();
                } else if (view.equals(saveScreenButton)) {
                    // 截图，在SnapshotReadyCallback中保存图片到 sd 卡
                    /**
                     * snapshot(BaiduMap.SnapshotReadyCallback callback):
                     *                 发起截图请求
                     * */
                    mBaiduMap.snapshot(new SnapshotReadyCallback() {
                        //地图截屏回调接口
                        public void onSnapshotReady(Bitmap snapshot) {
                            File file = new File("/mnt/sdcard/test.png");
                            FileOutputStream out;
                            try {
                                out = new FileOutputStream(file);
                                if (snapshot.compress(Bitmap.CompressFormat.PNG, 100, out)) {
                                    out.flush();
                                    out.close();
                                }
                                Toast.makeText(MapControlDemo.this,"屏幕截图成功，图片存在: " + file.toString(),
                                        Toast.LENGTH_SHORT).show();
                            } catch (FileNotFoundException e) {
                                e.printStackTrace();
                            } catch (IOException e) {
                                e.printStackTrace();
                            }
                        }
                    });
                    Toast.makeText(MapControlDemo.this, "正在截取屏幕图片...",
                            Toast.LENGTH_SHORT).show();

                }
                updateMapState();
            }

        };
        zoomButton.setOnClickListener(onClickListener);
        rotateButton.setOnClickListener(onClickListener);
        overlookButton.setOnClickListener(onClickListener);
        saveScreenButton.setOnClickListener(onClickListener);
    }

    /**
     * 处理缩放 sdk 缩放级别范围： [3.0,19.0]
     */
    private void perfomZoom() {
        EditText t = (EditText) findViewById(R.id.zoomlevel);
        try {
            float zoomLevel = Float.parseFloat(t.getText().toString());//字符串转float
            /**
             *zoomTo(float zoom):设置地图缩放级别
             * */
            MapStatusUpdate u = MapStatusUpdateFactory.zoomTo(zoomLevel);
            /**
             * animateMapStatus(MapStatusUpdate update):
             *             以动画方式更新地图状态，动画耗时 300 ms
             * */
            mBaiduMap.animateMapStatus(u);
        } catch (NumberFormatException e) {
            Toast.makeText(this, "请输入正确的缩放级别", Toast.LENGTH_SHORT).show();
        }
    }

    /**
     * 处理旋转 旋转角范围： -180 ~ 180 , 单位：度 逆时针旋转
     */
    private void perfomRotate() {
        EditText t = (EditText) findViewById(R.id.rotateangle);
        try {
            int rotateAngle = Integer.parseInt(t.getText().toString());//字符串转int
            /**
             * MapStatus.Builder(MapStatus previous):构造函数，以之前的地图状态为基础。
             * rotate(float rotate):设置地图旋转角度，逆时针旋转。
             * build():创建地图状态对象
             * */
            MapStatus ms = new MapStatus.Builder(mBaiduMap.getMapStatus()).rotate(rotateAngle).build();
            /**
             *newMapStatus(MapStatus mapStatus):设置地图新状态
             * */
            MapStatusUpdate u = MapStatusUpdateFactory.newMapStatus(ms);
            mBaiduMap.animateMapStatus(u);
        } catch (NumberFormatException e) {
            Toast.makeText(this, "请输入正确的旋转角度", Toast.LENGTH_SHORT).show();
        }
    }

    /**
     * 处理俯视 俯角范围： -45 ~ 0 , 单位： 度
     */
    private void perfomOverlook() {
        EditText t = (EditText) findViewById(R.id.overlookangle);
        try {
            int overlookAngle = Integer.parseInt(t.getText().toString());//字符串转int
            /**
             * MapStatus.Builder(MapStatus previous):构造函数，以之前的地图状态为基础。
             * overlook(float overlook):设置地图俯仰角
             * build():创建地图状态对象
             * */
            MapStatus ms = new MapStatus.Builder(mBaiduMap.getMapStatus()).overlook(overlookAngle).build();
            MapStatusUpdate u = MapStatusUpdateFactory.newMapStatus(ms);
            mBaiduMap.animateMapStatus(u);
        } catch (NumberFormatException e) {
            Toast.makeText(this, "请输入正确的俯角", Toast.LENGTH_SHORT).show();
        }
    }

    /**
     * 更新地图状态显示面板
     */
    private void updateMapState() {
        if (mStateBar == null) {
            return;
        }
        String state = "";
        if (currentPt == null) {
            state = "点击、长按、双击地图以获取经纬度和地图状态";
        } else {
            //点击类型，经度，纬度
            state = String.format(touchType + ",当前经度： %f 当前纬度：%f",
                    currentPt.longitude, currentPt.latitude);
        }
        state += "\n";
        MapStatus ms = mBaiduMap.getMapStatus();
        //缩放级别,旋转角度,俯视角度
        state += String.format(
                "zoom=%.1f rotate=%d overlook=%d",
                ms.zoom, (int) ms.rotate, (int) ms.overlook);
        mStateBar.setText(state);
    }

    @Override
    protected void onPause() {
        // MapView的生命周期与Activity同步，当activity挂起时需调用MapView.onPause()
        mMapView.onPause();
        super.onPause();
    }

    @Override
    protected void onResume() {
        // MapView的生命周期与Activity同步，当activity恢复时需调用MapView.onResume()
        mMapView.onResume();
        super.onResume();
    }

    @Override
    protected void onDestroy() {
        // MapView的生命周期与Activity同步，当activity销毁时需调用MapView.destroy()
        mMapView.onDestroy();
        super.onDestroy();
    }
}