以编程方式在Android上发送Ping

Question

Ok, I have no Idea how to do this, I need some help.

I need to send a Ping in JSON format into a server, I've already have it with all the information that I need... timestamp, location, device_id, etc... But.. how can I send it each 5 minutes automatically ?? I'm still looking for something useful but I have no succes.. I'm kind of new on this..

here's an example of my code, feel free to use it if it is useful for you :) ...

 package com.example.hugo.ping03; // imports.... public class MainActivity extends ActionBarActivity { //HTTP private AsyncHttpClient client;//crear cliente private AsyncHttpResponseHandler handler;//crear handler private Button send; //JSON JSONObject json; //objeto json Context context = this; //context element private StringEntity entity; //entity //Battery private IntentFilter batIntentFilter; private Intent battery; private int nivelBateria; //device_id private String id; //timestamp private int time; private Timestamp tsTemp; private Long tsLong; private String ts; //GPS (this one comes from another class.java) GPSTracker gps; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_ping03); client = new AsyncHttpClient(); String password = "pass"; client.setBasicAuth("hugo", password); send = (Button) findViewById(R.id.send); //battery level: batIntentFilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED); battery = this.registerReceiver(null, batIntentFilter); nivelBateria = battery.getIntExtra(BatteryManager.EXTRA_LEVEL, -1); //device_id: id = Secure.getString(getContentResolver(), Secure.ANDROID_ID); //timestamp time = (int) (System.currentTimeMillis()); tsTemp = new Timestamp(time); tsLong = System.currentTimeMillis()/1000; ts = tsLong.toString(); handler = new AsyncHttpResponseHandler() { @Override public void onSuccess(int statusCode, Header[] headers, byte[] response) { // called when response HTTP status is "200 OK" Log.d("onSuccess","ping exitoso !!!!"); Log.d("Nivel de Bateria:",String.valueOf(nivelBateria)); Log.d("Id de Dispositivo",id); Log.d("Timesatmp:",ts); } @Override public void onFailure(int statusCode, Header[] headers, byte[] errorResponse, Throwable e) { // called when response HTTP status is "4XX" (eg. 401, 403, 404) String statuscode = String.valueOf(statusCode); Log.d("onFailure","ping nulo a causa de: "); Log.d("Server statusCode",statuscode); } }; send.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { //mensaje a Log para indicar clic en botón Log.d("onPressButton","Click exitoso"); String klientourl = "server url"; //Strings to Post JSON : String status = "1"; String device_id = id; String timestamp =ts; String battery = String.valueOf(nivelBateria); json = new JSONObject(); gps = new GPSTracker(Ping03.this);//creamos objeto de clase //if GPS is Enabled... if (gps.canGetLocation()){ double latitude = gps.getLatitude(); double longitude = gps.getLongitude(); Log.d("Location is:", "Lat: "+latitude+" Long: "+longitude); String IamHere = "Lat: "+latitude+" Long: "+longitude; try { json.put("geo", IamHere); json.put("status", status); json.put("device_id", device_id); json.put("timeStamp", timestamp); json.put("battery", battery); }catch (JSONException e){ Log.e("Json", "unexpected JSON exception", e); } try { entity = new StringEntity(json.toString()); entity.setContentType(new BasicHeader(HTTP.CONTENT_TYPE, "application/json")); client.post(context, klientourl, entity, "application/json", handler); }catch (Exception e){} }else { //if we can gps.showSettingsAlert(); Log.d("Geoloc: ", "Disabled?"); } }// ./ end onClick }); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.menu_ping03, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); //noinspection SimplifiableIfStatement if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); } } 

Any ideas? thanks a lot!

Answer 1

If you want to perform some periodically repeating tasks, I'd suggest you make use of a AlarmManager component of the Android SDK.Alarm manager is a system service, thus you can access it by using the following line of code.

    AlarmManager mAlarmMgr=(AlarmManager) getSystemService(Context.ALARM_SERVICE);
//Then you can set alarm using mAlarmMgr.set().

You will then receive the alarm in an AlarmReceiver.

AlarmReciever class extends BroadcastReceiver and overrides onRecieve() method. inside onReceive() you can start an activity or service depending on your need like you can start an activity to vibrate phone or to ring the phone.

Here is an article from Android Developers that describes how to use AlarmManager and AlarmReceiver : http://developer.android.com/training/scheduling/alarms.html . After you are successful of setting an alarm with AlarmManager (for every 5 minutes) and intercepting it in your AlarmReceiver, you can start an IntentService that will send the ping json to your server.

I hope this helps. Cheers!

Answer 2

If you want to hit you server from android app after a fix time you should create a background service.and this service class will call server on a specific delay frequently.

public class MyService extends Service{

    Handler mHandler = new Handler();

    @Override
    public IBinder onBind(Intent arg0){
       return null;
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId){
       Log.e(TAG, "onStartCommand");
       super.onStartCommand(intent, flags, startId);       
       return START_STICKY;
    } 

    @Override
    public void onCreate(){
       Log.e(TAG, "onCreate");
       mHandler.postDelayed(mRun,300000);
    }

    Runnable mRun = new Runnable() {

       @Override
       public void run() {
           // TODO call your service here
           mHandler.postDelayed(mRun,300000);

       }
    };

}

start service from your activity like below -

private void startService(){
    Handler mStartServicehandler = new Handler();
    mStartServicehandler.post(new Runnable() {
        @Override
        public void run() {
            startService(new Intent(mContext,MyService.class));
        }
    });
}

do something like this. It will ping your server after every 5 min.