android gps 定位

客户需要跟踪运单信息，决定采用gps和 基站定位。经过几天的折腾，已粗见成效，以下为示例代码：

locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE); // 创建LocationManager对象

provider = locationManager.getBestProvider(getCriteria(), true); // 设置查询条件，返回定位方式,默认为GPS定位


//设置监听
locationListener = new LocationListener() {

            @Override
            public void onStatusChanged(String provider, int status,
                    Bundle extras) {
                // TODO Auto-generated method stub

            }

            @Override
            public void onProviderEnabled(String provider) {
                // TODO Auto-generated method stub
                Location l = locationManager.getLastKnownLocation(provider); // 获取位置信息
                updateView(l); // 更新EditText控件的内容
            }

            @Override
            public void onProviderDisabled(String provider) {
                
                updateView(null);
            }

            @Override
            public void onLocationChanged(Location location) {
                // TODO Auto-generated method stub
                updateView(location);
            }
        };



btn.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                progressDialog = new ProgressDialog(DemoActivity.this);
                progressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
                progressDialog.setMessage("定位中！");
                progressDialog.show();
                new Thread() {
                    @Override
                    public void run() {
                        getLocation();
                    };
                }.start();

            }
        });

private void getLocation() {
        // 获取位置管理服务

        try {

            location = locationManager.getLastKnownLocation(provider); // 通过GPS获取位置

            address = gps.updateToNewLocation(location);

            handler.sendEmptyMessage(2);

        } catch (Exception e) {
            // TODO Auto-generated catch block
            address = e.getMessage();
            handler.sendEmptyMessage(3);
        }
    }
private Handler handler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
            case 0:
                // 登录加载

                break;
            case 1:

                break;
            case 2:
                progressDialog.dismiss();
                updateView(location);

            default:
                break;
            }
        };
    };

需要注意的地方：

1、重写onStart，检测GPS是否开启

@Override
    protected void onStart() {
        // TODO Auto-generated method stub
        super.onStart();

            Boolean a = locationManager
                .isProviderEnabled(LocationManager.GPS_PROVIDER);

        if (!a) {
            Intent intent = new Intent();
            intent.setAction(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

            try {
                startActivity(intent);

            } catch (ActivityNotFoundException ex) {

                // The Android SDK doc says that the location settings
                // activity
                // may not be found. In that case show the general settings.

                // General settings activity
                intent.setAction(Settings.ACTION_SETTINGS);
                try {
                    startActivity(intent);
                } catch (Exception e) {
                }
            }
        }

    }

2、重写onResume，设置监听

@Override
    protected void onResume() {
        // TODO Auto-generated method stub
        super.onResume();

         locationManager.requestLocationUpdates(provider, 1000, 0,
         locationListener);// 此处实际用network方式定位

    }

2、重写onPause，注销监听

@Override
    protected void onPause() {
        // TODO Auto-generated method stub
        super.onPause();

         if (locationManager != null) {
         locationManager.removeUpdates(locationListener);
         }
    }