准备工作

  • 获取密钥: 具体步骤看这里
  • 下载库文件: 链接

事实上，我觉得百度的Android定位SDK开发指南已经很详细了。本文中的例子就是根据开发指南写的。

具体实现

设置AndroidManifest.xml

在application标签中声明service组件,每个app拥有自己单独的定位service

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

声明使用权限

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<!-- 这个权限用于进行网络定位 -->
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" >
</uses-permission>
<!-- 这个权限用于访问GPS定位 -->
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" >
</uses-permission>
<!-- 用于访问wifi网络信息，wifi信息会用于进行网络定位 -->
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" >
</uses-permission>
<!-- 获取运营商信息，用于支持提供运营商信息相关的接口 -->
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" >
</uses-permission>
<!-- 这个权限用于获取wifi的获取权限，wifi信息会用来进行网络定位 -->
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" >
</uses-permission>
<!-- 用于读取手机当前的状态 -->
<uses-permission android:name="android.permission.READ_PHONE_STATE" >
</uses-permission>
<!-- 写入扩展存储，向扩展卡写入数据，用于写入离线定位数据 -->
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" >
</uses-permission>
<!-- 访问网络，网络定位需要上网 -->
<uses-permission android:name="android.permission.INTERNET" />
<!-- SD卡读取权限，用户写入离线定位数据 -->
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" >
</uses-permission>
<!-- 允许应用读取低级别的系统日志文件 -->
<uses-permission android:name="android.permission.READ_LOGS" >
</uses-permission>
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" >
</uses-permission>
<!-- 允许应用读取低级别的系统日志文件 -->
<uses-permission android:name="android.permission.READ_LOGS" >
</uses-permission>

在application中设置AcessKey

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<meta-data
            android:name="com.baidu.lbsapi.API_KEY"
            android:value="key" /> 
            <!-- key:开发者申请的key,即准备工作中的密钥ak -->

代码实现: MainActivity.java

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public class MainActivity extends Activity {

    public LocationClient mLocationClient;
    public BDLocationListener myListener = new MyLocationListener();
    public NotifyListener mNotifyListener;

    private EditText showLocation;
    private Button startNotify, stopNotify;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        showLocation = (EditText) findViewById(R.id.showLocation);
        startNotify = (Button) findViewById(R.id.startNotify);
        stopNotify = (Button) findViewById(R.id.stopNotify);
        mLocationClient = new LocationClient(getApplicationContext());

        LocationClientOption option = new LocationClientOption();
        option.setLocationMode(LocationMode.Hight_Accuracy); // 设置定位模式
        option.setCoorType("bd0911"); // 返回的定位结果是百度经纬度，默认值gcj02
        option.setScanSpan(5000); // 发起定位请求时间间隔为5000ms
        option.setIsNeedAddress(true); // 返回的结果包含地址信息
        option.setNeedDeviceDirect(true); // 返回定位结果包含手机朝向
        option.setOpenGps(true); // 设置打开GPS，默认是不打开的
        mLocationClient.setLocOption(option);

        // 注册监听器
        mLocationClient.registerLocationListener(myListener);
        mLocationClient.start();

        new Thread() {
            public void run() {
                new Timer().schedule(new TimerTask() {

                    @Override
                    public void run() {
                        // TODO Auto-generated method stub
                        // 每隔3秒请求一次位置信息
                        mLocationClient.requestLocation();
                    }
                }, 0, 300);
            };
        }.start();

        // 位置提醒
        startNotify.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                mNotifyListener = new NotifyListener();
                // 4个参数代表要位置提醒的点的坐标，具体含义依次为：纬度，经度，距离范围，坐标系类型(gcj02,gps,bd09,bd09ll)
                mNotifyListener.SetNotifyLocation(23.0206, 113.0960, 3000,
                        "gcj02");
                // 注册位置监听提醒
                mLocationClient.registerNotify(mNotifyListener);
            }
        });

        stopNotify.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                mLocationClient.removeNotifyEvent(mNotifyListener);
            }
        });
    }

    @Override
    protected void onDestroy() {
        // TODO Auto-generated method stub
        super.onDestroy();
        mLocationClient.stop();
        mLocationClient.unRegisterLocationListener(myListener);
    }

    public class MyLocationListener implements BDLocationListener {

        @Override
        public void onReceiveLocation(BDLocation location) {
            // TODO Auto-generated method stub
            if (location == null) {
                return;
            }
            StringBuilder sb = new StringBuilder();
            sb.append("time: ");
            sb.append(location.getTime());
            sb.append("\nerr code: ");
            sb.append(location.getLocType());
            sb.append("\nlatitude: ");
            sb.append(location.getLatitude());
            sb.append("\nlongitude: ");
            sb.append(location.getLongitude());
            sb.append("\nradius: ");
            sb.append(location.getRadius());
            if (location.getLocType() == BDLocation.TypeGpsLocation) {
                sb.append("\nspeed: ");
                sb.append(location.getSpeed());
                sb.append("\nsatellite: ");
                sb.append(location.getSatelliteNumber());
            } else if (location.getLocType() == BDLocation.TypeNetWorkLocation) {
                sb.append("\naddr: ");
                sb.append(location.getAddrStr()); // 获取反地理编码地址
                sb.append("\nprovince: ");
                sb.append(location.getProvince());
                sb.append("\ncity: ");
                sb.append(location.getCity());
                sb.append("\ndistrict: ");
                sb.append(location.getDistrict());
            }
            // logMsg(sb.toString());
            showLocation.setText(sb.toString());
        }
    }

    public class NotifyListener extends BDNotifyListener {
        @Override
        public void onNotify(BDLocation location, float distance) {
            // TODO Auto-generated method stub
            Toast.makeText(
                    getApplicationContext(),
                    "距离" + location.getAddrStr() + String.valueOf(distance)
                            + "米", Toast.LENGTH_LONG).show();
        }
    }
}

效果图

百度定位