Android——定位服務(百度地圖)

第一步：在清單檔案中申請權限，如下：

    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
    <uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>
    <uses-permission android:name="android.permission.READ_PHONE_STATE"/>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"
        tools:ignore="ProtectedPermissions" />
    <uses-permission android:name="android.permission.WAKE_LOCK"/>

然后將自己創建應用申請到的ak密鑰添加到value中,android:name是固定的

 <meta-data
            android:name="com.baidu.lbsapi.API_KEY"
            android:value="ZnGU2mBmhv9uPVspDK29uueDSKYLloQ4"/>

在添加一個LDB SDK服務(內容固定不變)

 <service android:name="com.baidu.location.f"
                 android:enabled="true"
                 android:process=":remote"/>

兩種方式顯示定位資訊
第一種：經緯度，和省市區等詳細位置(定位方式必須是網路定位才能顯示詳細位置資訊)
第二種：圖型形式

activity_main.xml代碼如下：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity"
    android:orientation="vertical">

    <TextView
        android:id="@+id/position"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
    <View
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:background="#000"/>
    <com.baidu.mapapi.map.MapView
        android:id="@+id/baiduMap"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginTop="10dp"
        android:clickable="true"
        android:layout_gravity="center"/>

MainActivity.java代碼如下：

public class MainActivity extends AppCompatActivity {
    private MapView BaiduMap;
    private LocationClient Client;
    private TextView Position;
    private BaiduMap baiduMap;//地圖總控制器
    private boolean isFirstLocate = true;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //一定要在setContentView（）前呼叫
        SDKInitializer.initialize(getApplicationContext());
        Client = new LocationClient(getApplicationContext());//獲取全域Context
        Client.registerLocationListener(new MyLocationListener());//注冊一個定位監聽器，獲取位置資訊，回呼此定位監聽器

        setContentView(R.layout.activity_main);
        BaiduMap = (MapView) findViewById(R.id.baiduMap);
        Position = (TextView) findViewById(R.id.position);
        List<String> PermissionList = new ArrayList<>();
        baiduMap = BaiduMap.getMap();//獲取實體，可以對地圖進行一系列操作，比如：縮放范圍，移動地圖
        baiduMap.setMyLocationEnabled(true);//允許當前設備顯示在地圖上
        //判斷權限是否授權
        if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.ACCESS_FINE_LOCATION ) != PackageManager.PERMISSION_GRANTED){
            PermissionList.add(Manifest.permission.ACCESS_FINE_LOCATION);
        }
        if (ContextCompat.checkSelfPermission(MainActivity.this,Manifest.permission.READ_PHONE_STATE) != PackageManager.PERMISSION_GRANTED){
            PermissionList.add(Manifest.permission.READ_PHONE_STATE);
        }
        if (ContextCompat.checkSelfPermission(MainActivity.this,Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED){
            PermissionList.add(Manifest.permission.WRITE_EXTERNAL_STORAGE);
        }
        if (!PermissionList.isEmpty()){
            String[] Permissions = PermissionList.toArray(new String[PermissionList.size()]);//轉化為陣列
            ActivityCompat.requestPermissions(MainActivity.this,Permissions,1);//一次性申請權限
        }else {
            requestLocation();
        }
    }
    private void navigateTo(BDLocation location){
        if (isFirstLocate){
            LatLng lng = new LatLng(location.getLatitude(),location.getLongitude());//指定經緯度
            MapStatusUpdate update = MapStatusUpdateFactory.newLatLng(lng);
            baiduMap.animateMapStatus(update);
            update = MapStatusUpdateFactory.zoomTo(16f);//百度地圖縮放級別限定在3-19
            baiduMap.animateMapStatus(update);
            isFirstLocate = false;
        }
        MyLocationData.Builder builder = new MyLocationData.Builder();
        builder.latitude(location.getLatitude());
        builder.longitude(location.getLongitude());
        MyLocationData locationData = builder.build();
        baiduMap.setMyLocationData(locationData);
    }
    private void requestLocation(){
        InitLocation();
        Client.start();
    }
    /*
    * LBS SKD定位模式
    * 1：Hight_Accuracy:高精確模式，優先使用GPS定位，其次使用網路定位
    * 2:Battery_Saving：節電模式，使用網路定位
    * 3:Device_Sensors：傳感器模式，使用GPS
    * */
    private void InitLocation(){
        LocationClientOption option = new LocationClientOption();
        option.setLocationMode(LocationClientOption.LocationMode.Hight_Accuracy);//高精確模式
        option.setScanSpan(5000);//ms
        option.setIsNeedAddress(true);//獲取詳細資訊許可
        Client.setLocOption(option);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        Client.stop();
        BaiduMap.onDestroy();
        baiduMap.setMyLocationEnabled(false);
    }

    @Override
    protected void onResume() {
        super.onResume();
        BaiduMap.onResume();
    }

    @Override
    protected void onPause() {
        super.onPause();
        BaiduMap.onPause();
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        switch (requestCode){
            case 1:
                if (grantResults.length > 0){
                    for (int result : grantResults){
                        if (result != PackageManager.PERMISSION_GRANTED){
                            Toast.makeText(this,"必須同意所有權限才能使用本程式",Toast.LENGTH_SHORT).show();
                            finish();
                            return;
                        }
                    }
                    requestLocation();
                }else {
                    Toast.makeText(this,"發生未知錯誤",Toast.LENGTH_SHORT).show();
                    finish();
                }
                break;
                default:
        }
    }

    public class MyLocationListener implements BDLocationListener{

        @Override
        public void onReceiveLocation(BDLocation bdLocation) {
            if (bdLocation.getLocType() == BDLocation.TypeGpsLocation || bdLocation.getLocType() == BDLocation.TypeNetWorkLocation){
                navigateTo(bdLocation);
            }
            StringBuilder currentPosition = new StringBuilder();
            currentPosition.append("緯度：").append(bdLocation.getLatitude()).append("\n");
            currentPosition.append("經度：").append(bdLocation.getLongitude()).append("\n");
            currentPosition.append("國家：").append(bdLocation.getCountry()).append("\n");
            currentPosition.append("省：").append(bdLocation.getProvince()).append("\n");
            currentPosition.append("市/縣：").append(bdLocation.getCity()).append("\n");
            currentPosition.append("區/鄉:").append(bdLocation.getDistrict()).append("\n");
            currentPosition.append("街道/村:").append(bdLocation.getStreet()).append("\n");
            currentPosition.append("定位方式：");
            if (bdLocation.getLocType() == BDLocation.TypeGpsLocation){
                currentPosition.append("GPS");
            }else if (bdLocation.getLocType() == BDLocation.TypeNetWorkLocation){
                currentPosition.append("網路");
            }
            Position.setText(currentPosition);
        }
    }
}