使用 GPS 进行车辆跟踪的 Android 应用程序

Question

我想开发一个仅使用 GPS 信号进行车辆跟踪的 Android 应用程序。它将有两个组成部分：

1. 带有安卓应用程序的安卓设备将在车辆中被跟踪。它会在间隔 1 分钟后使用短信发送设备的纬度和经度。
2. 第二个组件将是一个 android 设备，消息将在其中传递，然后由一个 android 应用程序读取该消息，该应用程序将扫描消息的 lat 和 long。找到纬度和经度后，该位置将绘制在一些离线地图上。

我已经完成了第一个组件，但我被绘图部分卡住了。我如何构建一个可以绘制在短信中接收到的坐标的应用程序。 我可以使用谷歌地图 API，还是有更好的方法？我一直在寻找几天，但没有运气。请帮忙

Answer 1

我会告诉你如何发送短信来发送当前位置的经纬度

在您的 android 清单中允许这些权限

<uses-permission android:name="android.permission.SEND_SMS"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>

那么这就是你的活动

public class MainActivity extends AppCompatActivity {
    private static final int MY_PERMISSIONS_REQUEST_SEND_SMS = 0;
    public static final int MY_PERMISSIONS_REQUEST_LOCATION = 99;
    Button sendBtn;

    String phoneNo = "+923044075653";

    String message;
    LocationManager locationManager;
    FusedLocationProviderClient mFusedLocationClient;
        @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        sendBtn = (Button) findViewById(R.id.btnSendSMS);
        mFusedLocationClient = LocationServices.getFusedLocationProviderClient(this);

        getLastLocation();
        sendBtn.setOnClickListener(new View.OnClickListener() {
            public void onClick(View view) {
                sendSMSMessage();
            }
        });



    }
    protected void sendSMSMessage() {







        if (ContextCompat.checkSelfPermission(this,
                Manifest.permission.SEND_SMS)
                != PackageManager.PERMISSION_GRANTED) {
            if (ActivityCompat.shouldShowRequestPermissionRationale(this,
                    Manifest.permission.SEND_SMS)) {
            } else {
                ActivityCompat.requestPermissions(this,
                        new String[]{Manifest.permission.SEND_SMS},
                        MY_PERMISSIONS_REQUEST_SEND_SMS);
            }
        }
    }

    private boolean checkPermissions() {
        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED &&
                ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
            return true;
        }
        return false;
    }

    private void requestPermissions() {
        ActivityCompat.requestPermissions(
                this,
                new String[]{Manifest.permission.ACCESS_COARSE_LOCATION, Manifest.permission.ACCESS_FINE_LOCATION},
                MY_PERMISSIONS_REQUEST_LOCATION
        );
    }

    private boolean isLocationEnabled() {
        LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
        return locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER) || locationManager.isProviderEnabled(
                LocationManager.NETWORK_PROVIDER
        );
    }
    @Override
    public void onRequestPermissionsResult(int requestCode,String permissions[], int[] grantResults) {
        switch (requestCode) {
            case MY_PERMISSIONS_REQUEST_SEND_SMS: {
                if (grantResults.length > 0
                        && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    SmsManager smsManager = SmsManager.getDefault();
                    smsManager.sendTextMessage(phoneNo, null, message, null, null);
                    Toast.makeText(getApplicationContext(), "SMS sent.",
                            Toast.LENGTH_LONG).show();
                } else {
                    Toast.makeText(getApplicationContext(),
                            "SMS faild, please try again.", Toast.LENGTH_LONG).show();
                    return;
                }
            }
            case MY_PERMISSIONS_REQUEST_LOCATION: {
                if (grantResults.length > 0
                        && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    getLastLocation();
                } else {
                    // permission denied, boo! Disable the
                    // functionality that depends on this permission.
                }
            }


        }

    }
    @Override
    public void onResume(){
        super.onResume();
        if (checkPermissions()) {
            getLastLocation();
        }

    }

    @SuppressLint("MissingPermission")
    private void getLastLocation(){
        if (checkPermissions()) {
            if (isLocationEnabled()) {
                mFusedLocationClient.getLastLocation().addOnCompleteListener(
                        new OnCompleteListener<Location>() {
                            @Override
                            public void onComplete(@NonNull Task<Location> task) {
                                Location location = task.getResult();
                                if (location == null) {
                                    requestNewLocationData();
                                } else {

                                    message="http://maps.google.com?q="+location.getLatitude()+","+location.getLongitude();
                                }
                            }
                        }
                );
            } else {
                Toast.makeText(this, "Turn on location", Toast.LENGTH_LONG).show();
                Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
                startActivity(intent);
            }
        } else {
            requestPermissions();
        }


    }

    @SuppressLint("MissingPermission")
    private void requestNewLocationData(){

        LocationRequest mLocationRequest = new LocationRequest();
        mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
        mLocationRequest.setInterval(0);
        mLocationRequest.setFastestInterval(0);
        mLocationRequest.setNumUpdates(1);

        mFusedLocationClient = LocationServices.getFusedLocationProviderClient(this);
        mFusedLocationClient.requestLocationUpdates(
                mLocationRequest, mLocationCallback,
                Looper.myLooper()
        );

    }

    private LocationCallback mLocationCallback = new LocationCallback() {
        @Override
        public void onLocationResult(LocationResult locationResult) {
            Location mLastLocation = locationResult.getLastLocation();
            message="http://maps.google.com?q="+mLastLocation.getLatitude()+","+mLastLocation.getLongitude();
        }
    };

根据此代码，单击按钮将向您的移动网络发送一条短信

在你的 gradle 文件中包含这些库

implementation 'com.google.android.gms:play-services-location:17.0.0'