Question

我有谷歌搜索这个没有成功，接缝对我来说非常奇怪。

我正在构建一个简单的GPS应用程序来发送与HttpRequest的坐标，虽然我注意到在最小化UI然后最大化时，它会运行相同活动的副本。并加倍使用HttpRequest＆＃39>

private LocationManager locationManager;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_gps);
    processExtraData();

}


private void processExtraData() {
    locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
    locationManager.removeUpdates(this);

    locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,
            10000, 5, this);
}


    @Override
    public void onLocationChanged(Location location) {
        Bundle extras = getIntent().getExtras();
        String driver_id = extras.getString("driverid");

        String msg = "Driver:" + driver_id + "\nCurrent Location:\nLatitude: " + location.getLatitude()
                + "\nLongitude: " + location.getLongitude();

        new HttpRequestTask(
                new HttpRequest("https://www.autoflora.net/driver/gps.php?user_id=" + driver_id + "&latlong=" + location.getLatitude() + "*" + location.getLongitude(), HttpRequest.POST, "{ \"some\": \"data\" }"),
                new HttpRequest.Handler() {
                    @Override
                    public void response(HttpResponse response) {
                        if (response.code == 200) {
                            Log.d(this.getClass().toString(), "Request successful!");
                        } else {
                            Log.e(this.getClass().toString(), "Request unsuccessful: " + response);
                        }
                    }
                }).execute();
        String s = calc.getText().toString();
        calc.setText(s + "1")

        TextView driver = (TextView) findViewById(R.id.driver);
        driver.setText("" + driver_id);

        TextView Longitude = (TextView) findViewById(R.id.longitude);

        // Getting reference to TextView tv_latitude
        TextView Latitude = (TextView) findViewById(R.id.latitude);

        // Setting Current Longitude
        Longitude.setText("Longitude:" + location.getLongitude());

        // Setting Current Latitude
        Latitude.setText("Latitude:" + location.getLatitude());

        //  Toast.makeText(getBaseContext(), msg, Toast.LENGTH_LONG).show();
    }

Answer 1

注意到最小化UI然后最大化

Android上既没有minimising也没有maximizing的用户界面。您显然是通过启动器（这很可能是您的maximizing事件）再次启动活动，它会创建您的活动的新实例。如果您只想要允许单个实例，则必须在清单文件中声明活动时使用android:launchMode来设置系统。有关可能的选项，请参阅docs here。

Answer 2

 @Override
    public void onStart() {
        super.onStart();
        Toast.makeText(getBaseContext(), "start", Toast.LENGTH_LONG).show();

        locationManager.removeUpdates(this);
    }

    @Override
    public void onResume() {
        super.onResume();
        Toast.makeText(getBaseContext(), "resume", Toast.LENGTH_LONG).show();
        locationcheck(); // checks permissions
    }

    @Override
    public void onPause() {
        super.onPause();
        Toast.makeText(getBaseContext(), "pause", Toast.LENGTH_LONG).show();


    }

    @Override
    public void onStop() {
        super.onStop();
     //   locationManager.removeUpdates(this);
        Toast.makeText(getBaseContext(), "stop", Toast.LENGTH_LONG).show();

    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        Toast.makeText(getBaseContext(), "destroy", Toast.LENGTH_LONG).show();
        locationManager.removeUpdates(this);
        finish();

    }

好像已经修好了..

Android在最小化时复制活动，然后最大化

2 个答案: