I have an android app with Azure Mobile Services and implemented Offline Sync. The app works well but when syncing data it seems not to complete so there is always a few rows on tables which have not synced?
Anyone have any ideas what the problem might be. I believe that on the next try it would finish where it left off or am I wrong?
Thanks in advance
The app works well but when syncing data it seems not to complete so there is always a few rows on tables which have not synced?
I would recommend you use fiddler to capture the network traces when handling the sync operations.
For Incremental Sync, the request would be as follows:
Get https://{your-app-name}.azurewebsites.net/tables/TodoItem?$filter=(updatedAt%20ge%20datetimeoffset'2017-11-03T06%3A56%3A44.4590000%2B00%3A00')&$orderby=updatedAt&$skip=0&$top=50&__includeDeleted=true
For opting out of incremental sync, you would retrieve all records without the filter updatedAt.
Get https://{your-app-name}.azurewebsites.net/tables/TodoItem?$skip=0&$top=50&__includeDeleted=true
Note: If there are too many items, the SDK would send multiple requests to pull all items that match your given query from the associated remote table. Also, you need to make sure you specify the includeDeleted() in your query.
In summary, you need to make sure that all items could be retrieved via the above requests. Additionally, if the pull operation has pending local updates, then the pull operation would first execute a push operation. So, I assume that you could catch the exception when calling pull operation for handling the conflict resolution.
Bruce's answer is fine but I used a slightly different method without the need to use fiddler.
I change my connection from this
mClient = new MobileServiceClient("[AZUREWEBSITE]", cntxall);
mClient.setAndroidHttpClientFactory(new MyOkHttpClientFactory());
To this
mClient = new MobileServiceClient("[AZUREWEBSITE]", cntxall).withFilter(
new ServiceFilter() {
#Override
public ListenableFuture<ServiceFilterResponse> handleRequest(ServiceFilterRequest request, NextServiceFilterCallback nextServiceFilter) {
// Get the request contents
String url = request.getUrl();
String content = request.getContent();
if (url != null) {
Log.d("Request URL:", url);
}
if (content != null) {
Log.d("Request Content:", content);
}
// Execute the next service filter in the chain
ListenableFuture<ServiceFilterResponse> responseFuture = nextServiceFilter.onNext(request);
Futures.addCallback(responseFuture, new FutureCallback<ServiceFilterResponse>() {
#Override
public void onFailure(Throwable e) {
Log.d("Exception:", e.getMessage());
}
#Override
public void onSuccess(ServiceFilterResponse response) {
if (response != null && response.getContent() != null) {
Log.d("Response Content:", response.getContent());
}
}
});
return responseFuture;
}
}
);
This is the logging method for Azure connections and shows the request in the log.
I'm trying to writeCharacteristic() to a BLE device.
I used Google example app to establish the connection, the connection is fine. I can see the BLE Services and the services Characteristics.
The writeCharacteristic() method return true and the onCharacteristicWrite() callback return status BluetoothGatt.GATT_SUCCESS but nothing happening with the device:
I tried all the solutions in stack overflow and nothing helps.
Here is my code:
In the BluetoothLeService class i have sendData() method, which gets a byte[]
I'm sending each command separately because of the maximum payload of 33 bytes.
public void sendData(byte[] data) {
String lService = "71387664-eb78-11e6-b006-92361f002671";
String lCharacteristic = "71387663-eb78-11e6-b006-92361f002671";
BluetoothGattService mBluetoothLeService = null;
BluetoothGattCharacteristic mBluetoothGattCharacteristic = null;
if (mBluetoothGattCharacteristic == null) {
mBluetoothGattCharacteristic = mBluetoothGatt.getService(UUID.fromString(lService)).getCharacteristic(UUID.fromString(lCharacteristic));
}
mBluetoothGattCharacteristic.setValue(data);
boolean write = mBluetoothGatt.writeCharacteristic(mBluetoothGattCharacteristic);
}
In your code you check property of characteristics?
If Write something on device then characteristics must have write property or write no response property or write & notify property.
So Check in your code on which characteristics you are write.
Your code looks OK, if you've got GATT_SUCCESS it means that characteristic was written successfully.
You can also try to read this characteristic and check if value is updated. Also it's possible that characteristic was written successfully but corresponded device's functionality will be triggered only after disconnection from device. And also it's possible that there is some bug on a device side.
I found the issue. Hope my answer will help others.
The issue was that, I was sending byte[] array bigger than it's allow(20 byte). Also, I needed to add "\r" inside this byte[] array, thats way, the BLE Devise knows it's the end of the command.
Another thing, I needed to create a queue and pop from it after I get response in onCharacteristicRead().
class DataQueues {
private ArrayList<byte[]> queueArray;
private int queuSize;
protected DataQueues() {
queueArray = new ArrayList<>();
}
protected void addToQueue(byte[] bytesArr) {
queueArray.add(bytesArr);
}
protected byte[] popQueue() {
if (queueArray.size() >= 0)
return queueArray.remove(0);
else {
return null;
}
}
protected int getArrSize() {
return queueArray.size();
}
}
Hope this will help some one.
I have a application which uses camera functionality in it but part of its functionality can also run without camera feature. SO I have put this in my manifest.
<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera" android:required="false"/>
and in my code I check whether the device has camera or not using this
final boolean deviceHasCameraFlag = pm.hasSystemFeature(PackageManager.FEATURE_CAMERA);
Now I am testing my code on a tablet which runs Android 4.0(ICS) and has no camera. But still I get True value for the deviceHasCameraFlag. Is this weird or am I missing something.
I tried different things and even tried the same thing on Bluetooth feature as Tablet even doesn't have Bluetooth feature. It works fine for Bluetooth but gives me true for camera.
Which device is it? The answer you get is a bug, and 4.0 is very old nowadays. Many tablets that still run this version were not crafted correctly, both hardware and software featuring multiple problems.
Regardless, you should always be prepared to handle failure on Camera.open() or Camera.open(0): for example, in some cases other software on your device will not release the camera gracefully.
So, in your case you have a false positive, you try to open the camera, it fails, and you continue as if there is no camera on the device, even if PackageManager thinks that PackageManager.FEATURE_CAMERA is availabe.
Though I have accepted Alex's answer I still want to put this one collectively as what can be the best solution in such condition.
What I found was in case of some low standard android devices
pm.hasSystemFeature(PackageManager.FEATURE_CAMERA)
returns true even if camera doesn't exist and that seems to be a device bug for me which in unchecked.
So whenever there is scenario that you need to check if camera exists for a device or not best practice is something that I am putting below (best practice as per my knowledge if there is something more interesting and best solution that this you are welcome to put it here on this post)
int numberOfCameras = Camera.getNumberOfCameras();
context = this;
PackageManager pm = context.getPackageManager();
final boolean deviceHasCameraFlag = pm.hasSystemFeature(PackageManager.FEATURE_CAMERA);
if( !deviceHasCameraFlag || numberOfCameras==0 )
{
Log.e(TAG, "Device has no camera" + numberOfCameras);
Toast.makeText(getApplicationContext(), "Device has no camera", Toast.LENGTH_SHORT).show();
captureButton.setEnabled(false);
}
else
{
Log.e(TAG, "Device has camera" + deviceHasCameraFlag + numberOfCameras);
}
In this I am checking both number of cameras as well as device has camera feature Boolean , so in any case it would not fail my condition.
In my case I had this code:
public boolean hasCameraSupport() {
boolean hasSupport = false;
if(getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_ANY)) { //<- this constant caused problems
hasSupport = true;
}
return hasSupport;
}
and it kept returning false on a Genymotion device running Android 4.1.1 (API 16). Once I changed the constant PackageManager.FEATURE_CAMERA_ANY to PackageManager.FEATURE_CAMERA, my problems went away. I am guessing that not all devices/API levels support PackageManager.FEATURE_CAMERA_ANY.
I got it you will try this one definitely it will work....
import android.hardware.Camera;
int numCameras = Camera.getNumberOfCameras();
if (numCameras > 0) {
System.out.println("camera");
} else {
System.out.println("No Camera");
}
For CameraX, if the FEATURE_CAMERA_ANY method is still returning true when there is no Camera on device, you can add the below method. So whether FEATURE_CAMERA_ANY returns true or false when CameraX is getting initialized, Below method will make sure to do what you want if a camera is actually not available on device.
private CameraSelector cameraSelector;
private ProcessCameraProvider cameraAvailableCheck;
private ListenableFuture<ProcessCameraProvider> cameraAvailableCheckFuture;
private void checkIfAnyCameraExist()
{
cameraAvailableCheckFuture = ProcessCameraProvider.getInstance(context);
cameraAvailableCheckFuture.addListener(new Runnable() {
#Override
public void run() {
try {
cameraAvailableCheck = cameraAvailableCheckFuture.get();
if ((cameraAvailableCheck.hasCamera(cameraSelector.DEFAULT_BACK_CAMERA) || cameraAvailableCheck.hasCamera(cameraSelector.DEFAULT_FRONT_CAMERA) ))
{
//Do what you want if at least back OR front camera exist
}
else
{
//Do what you want if any camera does not exist
}
}
catch (ExecutionException | InterruptedException | CameraInfoUnavailableException e)
{
// No errors need to be handled for this Future.
// This should never be reached.
}
}
}, ContextCompat.getMainExecutor(this));
}
Please try this code:
private boolean isDeviceSupportCamera() {
if (getApplicationContext().getPackageManager().hasSystemFeature(
PackageManager.FEATURE_CAMERA)) {
// this device has a camera
return true;
} else {
// no camera on this device
return false;
}
}
Still it does't work then please let me know
i want to set the system preference (by code) for just using 2g networks instead of using 3g. so far i haven't found anything that could have helped me. i suppose i need to set it via the ConnectionManager? can anyone point me in the right direction here?
Unfortunately, you can't do this. The best you can do is take the user to the relevant settings screen (Mobile Network Settings), where they can choose for themselves. There's no API to actually change the setting.
Some ROMs (e.g. CyanogenMod) build this into the system, and there may be options if you are rooted/installed as a system app, but if you want something standard/mass applicable then I'm afraid you're out of luck.
use the following code
public class CheckNetworkType extends Activity
{
private static final String tag = "CheckNetworkType";
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
TelephonyManager tm = (TelephonyManager) this.getSystemService(Context.TELEPHONY_SERVICE);
if(tm.getNetworkType() == TelephonyManager.NETWORK_TYPE_EDGE )
{
// Network type is 2G
Log.v(tag, "2G or GSM");
}
else
if(tm.getNetworkType() == TelephonyManager.NETWORK_TYPE_CDMA)
{
// Network type is 2G
Log.v(tag, "2G or CDMA");
}
else
if(tm.getNetworkType() == TelephonyManager.NETWORK_TYPE_UMTS)
{
// Network type is 3G
Log.v(tag, "3G Network available.");
}
}
}
I have an application which I want to hit the market as a Paid app. I would like to have other version which would be a "trial" version with a time limit of say, 5 days?
How can I go about doing this?
Currently most developers accomplish this using one of the following 3 techniques.
The first approach is easily circumvented, the first time you run the app save the date/time to a file, database, or shared preferences and every time you run the app after that check to see if the trial period has ended. This is easy to circumvent because uninstalling and reinstalling will allow the user to have another trial period.
The second approach is harder to circumvent, but still circumventable. Use a hard coded time bomb. Basically with this approach you will be hard code an end date for the trial, and all users that download and use the app will stop being able to use the app at the same time. I have used this approach because it is easy to implement and for the most part I just didn't feel like going through the trouble of the third technique. Users can circumvent this by manually changing the date on their phone, but most users won't go through the trouble to do such a thing.
The third technique is the only way that I have heard about to truly be able to accomplish what you want to do. You will have to set up a server, and then whenever your application is started your app sends the phones unique identifier to the server. If the server does not have an entry for that phone id then it makes a new one and notes the time. If the server does have an entry for the phone id then it does a simple check to see if the trial period has expired. It then communicates the results of the trial expiration check back to your application. This approach should not be circumventable, but does require setting up a webserver and such.
It is always good practice to do these checks in the onCreate. If the expiration has ended popup an AlertDialog with a market link to the full version of the app. Only include an "OK" button, and once the user clicks on "OK" make a call to "finish()" to end the activity.
I've developed a Android Trial SDK which you can simply drop into your Android Studio project and it will take care of all the server-side management for you (including offline grace periods).
To use it, simply
Add the library to your main module's build.gradle
dependencies {
compile 'io.trialy.library:trialy:1.0.2'
}
Initialize the library in your main activity's onCreate() method
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//Initialize the library and check the current trial status on every launch
Trialy mTrialy = new Trialy(mContext, "YOUR_TRIALY_APP_KEY");
mTrialy.checkTrial(TRIALY_SKU, mTrialyCallback);
}
Add a callback handler:
private TrialyCallback mTrialyCallback = new TrialyCallback() {
#Override
public void onResult(int status, long timeRemaining, String sku) {
switch (status){
case STATUS_TRIAL_JUST_STARTED:
//The trial has just started - enable the premium features for the user
break;
case STATUS_TRIAL_RUNNING:
//The trial is currently running - enable the premium features for the user
break;
case STATUS_TRIAL_JUST_ENDED:
//The trial has just ended - block access to the premium features
break;
case STATUS_TRIAL_NOT_YET_STARTED:
//The user hasn't requested a trial yet - no need to do anything
break;
case STATUS_TRIAL_OVER:
//The trial is over
break;
}
Log.i("TRIALY", "Trialy response: " + Trialy.getStatusMessage(status));
}
};
To start a trial, call mTrialy.startTrial("YOUR_TRIAL_SKU", mTrialyCallback);
Your app key and trial SKU can be found in your Trialy developer dashboard.
This is an old question but anyways, maybe this will help someone.
In case you want to go with the most simplistic approach(which will fail if the app is uninstalled/reinstalled or user changes device's date manually), this is how it could be:
private final SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
private final long ONE_DAY = 24 * 60 * 60 * 1000;
#Override
protected void onCreate(Bundle state){
SharedPreferences preferences = getPreferences(MODE_PRIVATE);
String installDate = preferences.getString("InstallDate", null);
if(installDate == null) {
// First run, so save the current date
SharedPreferences.Editor editor = preferences.edit();
Date now = new Date();
String dateString = formatter.format(now);
editor.putString("InstallDate", dateString);
// Commit the edits!
editor.commit();
}
else {
// This is not the 1st run, check install date
Date before = (Date)formatter.parse(installDate);
Date now = new Date();
long diff = now.getTime() - before.getTime();
long days = diff / ONE_DAY;
if(days > 30) { // More than 30 days?
// Expired !!!
}
}
...
}
This question and the answer of snctln inspired me to work on a solution based on method 3 as my bachelor thesis. I know the current status is not for productive usage but I would love to hear what you think about it! Would you use such a system? Would you like to see it as a cloud service (not having trouble with configuring a server)? Concerned about security issues or stability reasons?
A soon as I finished the bachelor procedure I want to continue working on the software. So now its the time I need your feedback!
Sourcecode is hosted on GitHub https://github.com/MaChristmann/mobile-trial
Some information about the system:
- The system has three parts, a Android library, a node.js server and a configurator for managing multiple trial apps and publisher/developer accounts.
It only supports time-based trials and it uses your (play store or other) account rather than a phone ID.
For Android library it is based on the Google Play licensing verification library. I modified it to connect to the node.js server and additionally the library tries to recognize if a user changed the system date. It also caches a retrieved trial-license in AES encrypted Shared Preferences. You can configure the valid time of the cache with the configurator. If a user "clear data" the library will force a server-side check.
Server is using https and also digital signing the license-check response. It has also an API for CRUD trial apps and users (publisher and developer). Similiar to Licensing Verfication Library developers can test their behaviour implementation in the trial app with test result. So you in the configurator you can explicit set your license response to "licensed", "not licensed" or "server error".
If you update your app with an ass-kicking new feature you might want that everyone can try it again. In the configurator you can renew the trial license for users with expired licenses by setting a versioncode that should trigger this. For example user is running your app on versioncode 3 und you want him to try features of versioncode 4. If he updates the app or reinstall it he is able to use full trial period again because the server knows on which version he has tried it last time.
Everything is under the Apache 2.0 license
The easiest and best way to do this is the implement BackupSharedPreferences.
The preferences are preserved, even if the app is uninstalled and reinstalled.
Simply save the install date as a preference and you are good to go.
Here's the theory:
http://developer.android.com/reference/android/app/backup/SharedPreferencesBackupHelper.html
Here's the example:
Android SharedPreferences Backup Not Working
Approach 4: use the application install time.
Since API level 9 (Android 2.3.2, 2.3.1, Android 2.3, GINGERBREAD) there are firstInstallTime and lastUpdateTime in PackageInfo.
To read more:
How to get app install time from android
After looking at all options in this and other threads, these are my findings
Shared preferences, database
Can be cleared in the android settings, lost after an app reinstall. Can be backed up with android's backup mechanism and will be restored after a reinstall. Backup may not always be available, though should be on most devices
External storage (writing to a file)
Not affected by a clear from the settings or a reinstall if we don't write to the application's private directory. But: requires you to ask the user for their permission at runtime in newer android versions, so this is probably only feasible if you need that permission anyways. Can also be backed up.
PackageInfo.firstInstallTime
Is reset after a reinstall but stable across updates
Sign in to some account
Doesn't matter if it's their Google account via Firebase or one in your own server: the trial is bound to the account. Making a new account will reset the trial.
Firebase anonymous sign in
You can sign in a user anonymously and store data for them in Firebase. But apparently a reinstall of the app and maybe other undocumented events may give the user a new anonymous ID, resetting their trial time. (Google themselves don't provide much documentation on this)
ANDROID_ID
May not be available and may change under certain circumstances, e.g factory reset. The opinions on whether it's a good idea to use this to identify devices seem to differ.
Play Advertising ID
May be reset by the user. May be disabled by the user by opting out of ad tracking.
InstanceID
Reset on a reinstall. Reset in case of a security event. Can be reset by your app.
Which (combination of) methods work for you depends on your app and on how much effort you think the average John will put into gaining another trial period. I would recommend steering clear of using only anonymous Firebase and Advertising ID due to their instability. A multi-factor approach seems like it will yield the best results. Which factors are available to you depends on you app and its permissions.
For my own app I found shared preferences + firstInstallTime + backup of the preferences to be the least intrusive but also effective enough method. You have to make sure you only request a backup after checking and storing the trial start time in the shared preferences. Values in the shared Prefs must have precedence over the firstInstallTime. Then user has to reinstall the app, run it once and then clear the app's data to reset the trial, which is quite a lot of work. On devices without a backup transport the user can reset the trial by simply reinstalling, though.
I've made that approach available as an extensible library.
Now in the recent version of android free trial subscription has been added, you can unlock all your app's features only after buying the subscription within app for a free trial period.
This will let the user to use your app for a trial period , if the app is still uninstalled after the trial period then the subscription money will be transferred to you.
I have not tried , but just sharing an idea.
Here's documentation
In my opinion, the best way to do this is to simply use the Firebase Realtime Database:
1) Add Firebase support to your app
2) Select 'Anonymous authentication' so that the user doesn't have to signup or even know what you're doing. This is guaranteed to link to the currently authenticated user account and so will work across devices.
3) Use the Realtime Database API to set a value for 'installed_date'. At launch time, simply retrieve this value and use this.
I've done the same and it works great. I was able to test this across uninstall / re-installs and the value in the realtime database remains the same. This way your trial period works across multiple user devices. You can even version your install_date so that the app 'resets' the Trial date for each new major release.
UPDATE: After testing a bit more, it seems anonymous Firebase seems to allocate a different ID in case you've got different devices and is not guaranteed between re-installs :/ The only guaranteed way is to use Firebase but tie it to their google account. This should work, but would require an extra step where the user first needs to login / signup.
I've thus far ended up with a slightly less elegant approach of simply checking against backed-up preferences and a date stored in preferences upon install. This works for data-centric apps where it's pointless for a person to re-install the app and re-enter all the data previously added, but would not work for a simple game.
By definition, all paid Android apps on the market can be evaluated for 24 hours after purchase.
There's an 'Uninstall and Refund' button which changes to 'Uninstall' after 24 hours.
I'd argue this button is way too prominent!
I come across this question while searching for the same problem, i think we can utilize free date api like http://www.timeapi.org/utc/now or some other date api to check for expiry of trail app. this way is efficient if you wish to deliver the demo and worried about payment and require fix tenure demo. :)
find the code below
public class ValidationActivity extends BaseMainActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
#Override
protected void onResume() {
processCurrentTime();
super.onResume();
}
private void processCurrentTime() {
if (!isDataConnectionAvailable(ValidationActivity.this)) {
showerrorDialog("No Network coverage!");
} else {
String urlString = "http://api.timezonedb.com/?zone=Europe/London&key=OY8PYBIG2IM9";
new CallAPI().execute(urlString);
}
}
private void showerrorDialog(String data) {
Dialog d = new Dialog(ValidationActivity.this);
d.setTitle("LS14");
TextView tv = new TextView(ValidationActivity.this);
tv.setText(data);
tv.setPadding(20, 30, 20, 50);
d.setContentView(tv);
d.setOnDismissListener(new OnDismissListener() {
#Override
public void onDismiss(DialogInterface dialog) {
finish();
}
});
d.show();
}
private void checkExpiry(int isError, long timestampinMillies) {
long base_date = 1392878740000l;// feb_19 13:8 in GMT;
// long expiryInMillies=1000*60*60*24*5;
long expiryInMillies = 1000 * 60 * 10;
if (isError == 1) {
showerrorDialog("Server error, please try again after few seconds");
} else {
System.out.println("fetched time " + timestampinMillies);
System.out.println("system time -" + (base_date + expiryInMillies));
if (timestampinMillies > (base_date + expiryInMillies)) {
showerrorDialog("Demo version expired please contact vendor support");
System.out.println("expired");
}
}
}
private class CallAPI extends AsyncTask<String, String, String> {
#Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
}
#Override
protected String doInBackground(String... params) {
String urlString = params[0]; // URL to call
String resultToDisplay = "";
InputStream in = null;
// HTTP Get
try {
URL url = new URL(urlString);
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
in = new BufferedInputStream(urlConnection.getInputStream());
resultToDisplay = convertStreamToString(in);
} catch (Exception e) {
System.out.println(e.getMessage());
return e.getMessage();
}
return resultToDisplay;
}
protected void onPostExecute(String result) {
int isError = 1;
long timestamp = 0;
if (result == null || result.length() == 0 || result.indexOf("<timestamp>") == -1 || result.indexOf("</timestamp>") == -1) {
System.out.println("Error $$$$$$$$$");
} else {
String strTime = result.substring(result.indexOf("<timestamp>") + 11, result.indexOf("</timestamp>"));
System.out.println(strTime);
try {
timestamp = Long.parseLong(strTime) * 1000;
isError = 0;
} catch (NumberFormatException ne) {
}
}
checkExpiry(isError, timestamp);
}
} // end CallAPI
public static boolean isDataConnectionAvailable(Context context) {
ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo info = connectivityManager.getActiveNetworkInfo();
if (info == null)
return false;
return connectivityManager.getActiveNetworkInfo().isConnected();
}
public String convertStreamToString(InputStream is) throws IOException {
if (is != null) {
Writer writer = new StringWriter();
char[] buffer = new char[1024];
try {
Reader reader = new BufferedReader(new InputStreamReader(is, "UTF-8"));
int n;
while ((n = reader.read(buffer)) != -1) {
writer.write(buffer, 0, n);
}
} finally {
is.close();
}
return writer.toString();
} else {
return "";
}
}
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
}
}
its working solution.....
Here is how i went about mine,
I created 2 apps one with trial activity the other without,
i uploaded the one without trial activity to play store as paid app,
and the one with trial activity as free app.
The free app on first launch has options for trial and store purchase,
if the user select store purchase it redirects to the store for the user to purchase
but if the user clicks trial it take them to the trial activity
NB: I used option 3 like #snctln but with modifications
first, i did not depend on the device time, i got my time from the php file that does the trial registration to the db,
secondly, i used the device serial number to uniquely identify each device,
lastly, the app depends on the time value returned from the server connection not its own time so the system can only be circumvented if the device serial number is changed, which is quite stressful for a user.
so here goes my code (for the Trial activity):
package com.example.mypackage.my_app.Start_Activity.activity;
import android.Manifest;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.pm.PackageManager;
import android.graphics.Color;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.telephony.TelephonyManager;
import android.view.KeyEvent;
import android.widget.TextView;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.JsonObjectRequest;
import com.android.volley.toolbox.Volley;
import com.example.onlinewisdom.cbn_app.R;
import com.example.mypackage.my_app.Start_Activity.app.Config;
import com.example.mypackage.my_app.Start_Activity.data.TrialData;
import com.example.mypackage.my_app.Start_Activity.helper.connection.Connection;
import com.google.gson.Gson;
import org.json.JSONObject;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import cn.pedant.SweetAlert.SweetAlertDialog;
public class Trial extends AppCompatActivity {
Connection check;
SweetAlertDialog pDialog;
TextView tvPleaseWait;
private static final int MY_PERMISSIONS_REQUEST_READ_PHONE_STATE = 0;
String BASE_URL = Config.BASE_URL;
String BASE_URL2 = BASE_URL+ "/register_trial/"; //http://ur link to ur API
//KEY
public static final String KEY_IMEI = "IMEINumber";
private final SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
private final long ONE_DAY = 24 * 60 * 60 * 1000;
SharedPreferences preferences;
String installDate;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_trial);
preferences = getPreferences(MODE_PRIVATE);
installDate = preferences.getString("InstallDate", null);
pDialog = new SweetAlertDialog(this, SweetAlertDialog.PROGRESS_TYPE);
pDialog.getProgressHelper().setBarColor(Color.parseColor("#008753"));
pDialog.setTitleText("Loading...");
pDialog.setCancelable(false);
tvPleaseWait = (TextView) findViewById(R.id.tvPleaseWait);
tvPleaseWait.setText("");
if(installDate == null) {
//register app for trial
animateLoader(true);
CheckConnection();
} else {
//go to main activity and verify there if trial period is over
Intent i = new Intent(Trial.this, MainActivity.class);
startActivity(i);
// close this activity
finish();
}
}
public void CheckConnection() {
check = new Connection(this);
if (check.isConnected()) {
//trigger 'loadIMEI'
loadIMEI();
} else {
errorAlert("Check Connection", "Network is not detected");
tvPleaseWait.setText("Network is not detected");
animateLoader(false);
}
}
public boolean onKeyDown(int keyCode, KeyEvent event) {
//Changes 'back' button action
if (keyCode == KeyEvent.KEYCODE_BACK) {
finish();
}
return true;
}
public void animateLoader(boolean visibility) {
if (visibility)
pDialog.show();
else
pDialog.hide();
}
public void errorAlert(String title, String msg) {
new SweetAlertDialog(this, SweetAlertDialog.ERROR_TYPE)
.setTitleText(title)
.setContentText(msg)
.show();
}
/**
* Called when the 'loadIMEI' function is triggered.
*/
public void loadIMEI() {
// Check if the READ_PHONE_STATE permission is already available.
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.READ_PHONE_STATE)
!= PackageManager.PERMISSION_GRANTED) {
// READ_PHONE_STATE permission has not been granted.
requestReadPhoneStatePermission();
} else {
// READ_PHONE_STATE permission is already been granted.
doPermissionGrantedStuffs();
}
}
/**
* Requests the READ_PHONE_STATE permission.
* If the permission has been denied previously, a dialog will prompt the user to grant the
* permission, otherwise it is requested directly.
*/
private void requestReadPhoneStatePermission() {
if (ActivityCompat.shouldShowRequestPermissionRationale(this,
Manifest.permission.READ_PHONE_STATE)) {
// Provide an additional rationale to the user if the permission was not granted
// and the user would benefit from additional context for the use of the permission.
// For example if the user has previously denied the permission.
new AlertDialog.Builder(Trial.this)
.setTitle("Permission Request")
.setMessage(getString(R.string.permission_read_phone_state_rationale))
.setCancelable(false)
.setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
//re-request
ActivityCompat.requestPermissions(Trial.this,
new String[]{Manifest.permission.READ_PHONE_STATE},
MY_PERMISSIONS_REQUEST_READ_PHONE_STATE);
}
})
.setIcon(R.drawable.warning_sigh)
.show();
} else {
// READ_PHONE_STATE permission has not been granted yet. Request it directly.
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.READ_PHONE_STATE},
MY_PERMISSIONS_REQUEST_READ_PHONE_STATE);
}
}
/**
* Callback received when a permissions request has been completed.
*/
#Override
public void onRequestPermissionsResult(int requestCode, #NonNull String[] permissions, #NonNull int[] grantResults) {
if (requestCode == MY_PERMISSIONS_REQUEST_READ_PHONE_STATE) {
// Received permission result for READ_PHONE_STATE permission.est.");
// Check if the only required permission has been granted
if (grantResults.length == 1 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
// READ_PHONE_STATE permission has been granted, proceed with displaying IMEI Number
//alertAlert(getString(R.string.permision_available_read_phone_state));
doPermissionGrantedStuffs();
} else {
alertAlert(getString(R.string.permissions_not_granted_read_phone_state));
}
}
}
private void alertAlert(String msg) {
new AlertDialog.Builder(Trial.this)
.setTitle("Permission Request")
.setMessage(msg)
.setCancelable(false)
.setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// do somthing here
}
})
.setIcon(R.drawable.warning_sigh)
.show();
}
private void successAlert(String msg) {
new SweetAlertDialog(this, SweetAlertDialog.SUCCESS_TYPE)
.setTitleText("Success")
.setContentText(msg)
.setConfirmText("Ok")
.setConfirmClickListener(new SweetAlertDialog.OnSweetClickListener() {
#Override
public void onClick(SweetAlertDialog sDialog) {
sDialog.dismissWithAnimation();
// Prepare intent which is to be triggered
//Intent i = new Intent(Trial.this, MainActivity.class);
//startActivity(i);
}
})
.show();
}
public void doPermissionGrantedStuffs() {
//Have an object of TelephonyManager
TelephonyManager tm =(TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE);
//Get IMEI Number of Phone //////////////// for this example i only need the IMEI
String IMEINumber = tm.getDeviceId();
/************************************************
* **********************************************
* This is just an icing on the cake
* the following are other children of TELEPHONY_SERVICE
*
//Get Subscriber ID
String subscriberID=tm.getDeviceId();
//Get SIM Serial Number
String SIMSerialNumber=tm.getSimSerialNumber();
//Get Network Country ISO Code
String networkCountryISO=tm.getNetworkCountryIso();
//Get SIM Country ISO Code
String SIMCountryISO=tm.getSimCountryIso();
//Get the device software version
String softwareVersion=tm.getDeviceSoftwareVersion()
//Get the Voice mail number
String voiceMailNumber=tm.getVoiceMailNumber();
//Get the Phone Type CDMA/GSM/NONE
int phoneType=tm.getPhoneType();
switch (phoneType)
{
case (TelephonyManager.PHONE_TYPE_CDMA):
// your code
break;
case (TelephonyManager.PHONE_TYPE_GSM)
// your code
break;
case (TelephonyManager.PHONE_TYPE_NONE):
// your code
break;
}
//Find whether the Phone is in Roaming, returns true if in roaming
boolean isRoaming=tm.isNetworkRoaming();
if(isRoaming)
phoneDetails+="\nIs In Roaming : "+"YES";
else
phoneDetails+="\nIs In Roaming : "+"NO";
//Get the SIM state
int SIMState=tm.getSimState();
switch(SIMState)
{
case TelephonyManager.SIM_STATE_ABSENT :
// your code
break;
case TelephonyManager.SIM_STATE_NETWORK_LOCKED :
// your code
break;
case TelephonyManager.SIM_STATE_PIN_REQUIRED :
// your code
break;
case TelephonyManager.SIM_STATE_PUK_REQUIRED :
// your code
break;
case TelephonyManager.SIM_STATE_READY :
// your code
break;
case TelephonyManager.SIM_STATE_UNKNOWN :
// your code
break;
}
*/
// Now read the desired content to a textview.
//tvPleaseWait.setText(IMEINumber);
UserTrialRegistrationTask(IMEINumber);
}
/**
* Represents an asynchronous login task used to authenticate
* the user.
*/
private void UserTrialRegistrationTask(final String IMEINumber) {
JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.GET, BASE_URL2+IMEINumber, null,
new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject response) {
Gson gson = new Gson();
TrialData result = gson.fromJson(String.valueOf(response), TrialData.class);
animateLoader(false);
if ("true".equals(result.getError())) {
errorAlert("Error", result.getResult());
tvPleaseWait.setText("Unknown Error");
} else if ("false".equals(result.getError())) {
//already created install/trial_start date using the server
// so just getting the date called back
Date before = null;
try {
before = (Date)formatter.parse(result.getResult());
} catch (ParseException e) {
e.printStackTrace();
}
Date now = new Date();
assert before != null;
long diff = now.getTime() - before.getTime();
long days = diff / ONE_DAY;
// save the date received
SharedPreferences.Editor editor = preferences.edit();
editor.putString("InstallDate", String.valueOf(days));
// Commit the edits!
editor.apply();
//go to main activity and verify there if trial period is over
Intent i = new Intent(Trial.this, MainActivity.class);
startActivity(i);
// close this activity
finish();
//successAlert(String.valueOf(days));
//if(days > 5) { // More than 5 days?
// Expired !!!
//}
}
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
animateLoader(false);
//errorAlert(error.toString());
errorAlert("Check Connection", "Could not establish a network connection.");
tvPleaseWait.setText("Network is not detected");
}
})
{
protected Map<String, String> getParams() {
Map<String, String> params = new HashMap<String, String>();
params.put(KEY_IMEI, IMEINumber);
return params;
}
};
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(jsonObjectRequest);
}
}
My php file looks like this (its a REST-slim technology):
/**
* registerTrial
*/
public function registerTrial($IMEINumber) {
//check if $IMEINumber already exist
// Instantiate DBH
$DBH = new PDO_Wrapper();
$DBH->query("SELECT date_reg FROM trials WHERE device_id = :IMEINumber");
$DBH->bind(':IMEINumber', $IMEINumber);
// DETERMINE HOW MANY ROWS OF RESULTS WE GOT
$totalRows_registered = $DBH->rowCount();
// DETERMINE HOW MANY ROWS OF RESULTS WE GOT
$results = $DBH->resultset();
if (!$IMEINumber) {
return 'Device serial number could not be determined.';
} else if ($totalRows_registered > 0) {
$results = $results[0];
$results = $results['date_reg'];
return $results;
} else {
// Instantiate variables
$trial_unique_id = es_generate_guid(60);
$time_reg = date('H:i:s');
$date_reg = date('Y-m-d');
$DBH->beginTransaction();
// opening db connection
//NOW Insert INTO DB
$DBH->query("INSERT INTO trials (time_reg, date_reg, date_time, device_id, trial_unique_id) VALUES (:time_reg, :date_reg, NOW(), :device_id, :trial_unique_id)");
$arrayValue = array(':time_reg' => $time_reg, ':date_reg' => $date_reg, ':device_id' => $IMEINumber, ':trial_unique_id' => $trial_unique_id);
$DBH->bindArray($arrayValue);
$subscribe = $DBH->execute();
$DBH->endTransaction();
return $date_reg;
}
}
then on the main activity i use the shared preference (installDate created in trial activity) to monitor the number of days remaining and if the days are over i block the main activity UI with a message that takes them to the store to purchase.
The only down side i see here is that if a Rogue user buys the paid app and decides to share with apps like Zender, file share or even host the apk file directly on a server for people to download for free. But am sure i will soon edit this answer with a solution to that or a link to the solution.
Hope this saves a soul...some day
Happy Coding...
#snctln option 3 can be easily done adding a php file to a web server with php and mysql installed as many of them have.
From the Android side an identifier (the device ID, google account o whatever you want) is passed as argument in the URL using HttpURLConnection and the php returns the date of the first install if it exist in the table or it inserts a new row and it return the current date.
It works fine for me.
If I have time I will post some code !
Good Luck !