Android 获取LocationProvider以及获取定位信息-白红宇

Android 获取LocationProvider以及获取定位信息

阅读量：7178 次

发布时间：2019-06-29

本文共 5255 字，大约阅读时间需要 17 分钟。

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");        }    }