Android 获取LocationProvider以及获取定位信息

 

获取LocationProvider的三种方法

一、获取所有的LocationProvider并用TextView显示出来

        //获取显示LocationProvider名称的TextView
        providerTv = findViewById(R.id.act_provider_tv);
        //获取位置服务
        LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
        //这个方法返回值是List集合,里面数据是String类型的
        List providerNames = locationManager.getAllProviders();//获取所有的LocationProvider名称
        StringBuilder stringBuilder = new StringBuilder();//字符构建器
        for ( Iterator iterator = providerNames.iterator();iterator.hasNext();) {
            stringBuilder.append(iterator.next() + "\n");
        }
        providerTv.setText(stringBuilder.toString());

二、通过名称获得LocationProvider

        //获取显示LocationProvider名称的TextView
        providerTv = findViewById(R.id.act_provider_tv);
        //获取位置服务
        LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);

        //获取基于GPS的LocationProvider
        //需要加入权限  
        LocationProvider provider = locationManager.getProvider(LocationManager.GPS_PROVIDER);

        providerTv.setText(provider.getName());

三、通过Criteria类获得LocationProvider

        //获取显示LocationProvider名称的TextView
        providerTv = findViewById(R.id.act_provider_tv);
        //获取位置服务
        LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);

        //获取最佳的LocationProvider
        //创建一个过滤条件对象
        //需要加入权限  
        Criteria criteria = new Criteria();
        //设置为不收费的
        criteria.setCostAllowed(false);
        //使用精度最准确的
        criteria.setAccuracy(Criteria.ACCURACY_FINE);
        //设置中等耗电量
        criteria.setPowerRequirement(Criteria.POWER_MEDIUM);
        //获取最佳的LocationProvider名称
        String provider = locationManager.getBestProvider(criteria, true);
        providerTv.setText(provider);

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获取定位信息

• 获取一个locationManager对象，主要通过getSystemService获取
• 设置一个监听器，用来实现每隔一段时间获取定位信息
• 编写一个locationUpdates方法，把获取到的定位信息进行输出
• 获取locationManager对象的getLastKnownLocation方法获取最新的定位信息
• 传到locationUpdates方法中

private TextView locationTv;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);     //设置全屏

        //获取显示LocationProvider名称的TextView
        locationTv = findViewById(R.id.act_title_tv);
        //获取位置服务
        LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
        //权限检查,编辑器自动添加
        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
            // TODO: Consider calling
            //    ActivityCompat#requestPermissions
            // here to request the missing permissions, and then overriding
            //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
            //                                          int[] grantResults)
            // to handle the case where the user grants the permission. See the documentation
            // for ActivityCompat#requestPermissions for more details.
            return;
        }
        assert locationManager != null;
        locationManager.requestLocationUpdates(
                LocationManager.GPS_PROVIDER,   //指定GPS定位的提供者
                1000,                 //间隔时间
                1,                 //位置间隔1米
                new LocationListener() {//监听GPS定位信息是否改变
                    @Override
                    public void onLocationChanged(Location location) {
                    //GPS信息发生改变时,回调
                    }

                    @Override
                    public void onStatusChanged(String provider, int status, Bundle extras) {
                        //GPS状态发生改变时,回调
                    }

                    @Override
                    public void onProviderEnabled(String provider) {
                    //定位提供者启动时回调
                    }

                    @Override
                    public void onProviderDisabled(String provider) {
                        //定位提供者关闭时回调
                    }
                }
        );
        //获取最新的定位信息
        Location location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
        //将最新的定位信息传递给locationUpdates()方法
        locationUpdates(location);
//              需要添加两个位置权限
//              近似精度的权限
//            
//              更精细精度的访问权限
//            

    }

    public void locationUpdates(Location location) {
        if (location != null) {
            //创建一个字符串构建器,用于记录位置信息
            StringBuilder stringBuilder = new StringBuilder();
            stringBuilder.append("您的位置是: \n");
            stringBuilder.append("经度: ");
            stringBuilder.append(location.getLongitude());
            stringBuilder.append("\n 纬度:");
            stringBuilder.append(location.getLatitude());
            locationTv.setText(stringBuilder.toString());

        } else {
            locationTv.setText("没有获取到GPS信息");
        }
    }