我有一个应用程序，我想作为付费应用程序投放市场。我想要其他版本，它是一个“试用”版本，时间限制为 5 天？
我该怎么做呢？
问问题
66852 次
13 回答
188
目前，大多数开发人员使用以下 3 种技术之一来完成此操作。
第一种方法很容易绕过，第一次运行应用程序时将日期/时间保存到文件、数据库或共享首选项中，然后每次运行应用程序时检查试用期是否结束。这很容易规避，因为卸载和重新安装将允许用户有另一个试用期。
第二种方法更难规避，但仍然可以规避。使用硬编码的定时炸弹。基本上，使用这种方法，您将硬编码试用的结束日期，并且所有下载和使用该应用程序的用户将无法同时使用该应用程序。我使用这种方法是因为它很容易实现，而且在大多数情况下，我只是不想经历第三种技术的麻烦。用户可以通过手动更改手机上的日期来规避这种情况，但大多数用户不会费心去做这样的事情。
第三种技术是我听说过的唯一能够真正完成你想做的事情的方法。您必须设置一个服务器，然后每当您的应用程序启动时，您的应用程序就会将手机的唯一标识符发送到服务器。如果服务器没有该电话 ID 的条目，则它会创建一个新条目并记录时间。如果服务器确实有电话 id 条目，那么它会进行简单的检查以查看试用期是否已过期。然后它将试用到期检查的结果传回给您的应用程序。这种方法不应该是可以规避的，但确实需要设置网络服务器等。
在 onCreate 中进行这些检查总是好的做法。如果到期已结束，则会弹出一个 AlertDialog，其中包含指向应用程序完整版本的市场链接。只包含一个“OK”按钮，一旦用户点击“OK”，就调用“finish()”来结束活动。
于 2009-06-15T14:02:04.377 回答
22
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.
于 2017-04-17T09:30:18.550 回答
18
这是一个老问题，但无论如何，也许这会对某人有所帮助。
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 !!!
}
}
...
}
于 2012-02-03T00:37:49.673 回答
10
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
于 2013-03-21T12:19:42.400 回答
6
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
于 2013-07-25T19:25:32.823 回答
5
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
于 2013-12-09T05:14:57.550 回答
4
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.
于 2017-02-18T22:24:49.267 回答
3
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.
于 2013-09-05T13:21:05.227 回答
3
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.
于 2016-10-05T12:01:19.023 回答
1
根据定义，市场上所有付费 Android 应用都可以在购买后 24 小时内进行评估。
有一个“卸载和退款”按钮，24 小时后会变为“卸载”。
我认为这个按钮太突出了！
于 2009-12-04T08:09:27.640 回答
1
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.....
于 2014-02-18T16:59:29.263 回答
0
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...
于 2017-03-10T17:34:53.590 回答
0
@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 !
于 2017-06-24T19:15:08.710 回答