blocks|key|1530184|text|目前，大多数开发人员使用以下3种技术之一来实现这一点。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1530185|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，之后每次运行应用程序时，都会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。|1530186|第二种方法更难绕过，但仍然可以绕过。使用硬编码的定时炸弹。基本上，使用这种方法，您将硬编码一个试用的结束日期，并且所有下载和使用该应用程序的用户将同时停止使用该应用程序。我之所以使用这种方法，是因为它很容易实现，而且在很大程度上，我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一点，但大多数用户不会不厌其烦地这样做。|1530187|第三种技术是我听说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，您的应用程序都会将phones+unique+identifier发送到服务器。如果服务器没有该电话id的条目，那么它会创建一个新的条目并记下时间。如果服务器确实有电话id的条目，那么它会执行一个简单的检查，以查看试用期是否已到期。然后，它将试用过期检查的结果传送回您的应用程序。这种方法不应该被绕过，但确实需要设置and服务器等。|offset|length|1530188|在onCreate中执行这些检查始终是一种良好的做法。如果过期已结束，则会弹出一个AlertDialog，其中包含该应用程序完整版的market+link。只包含一个"OK“按钮，一旦用户单击了"OK”，就调用"finish()“来结束活动。|1530189|entityMap|0|LINK|mutability|MUTABLE|url|http://developer.android.com/reference/android/telephony/TelephonyManager.html#getDeviceId()|1|http://developer.android.com/guide/publishing/publishing.html#marketintent^0|0|0|0|1Q|O|0|0|1U|B|1|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|W|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|X|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|Y|8|@]|9|@$H|Z|I|10|1|11]]|A|$]]|$1|J|3|K|5|6|7|12|8|@]|9|@$H|13|I|14|1|15]]|A|$]]|$1|L|3|-4|5|6|7|16|8|@]|9|@]|A|$]]]|M|$N|$5|O|P|Q|A|$R|S]]|T|$5|O|P|Q|A|$R|U]]]]

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 <a href="http://developer.android.com/reference/android/telephony/TelephonyManager.html#getDeviceId()" rel="noreferrer">phones unique identifier</a> 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 <a href="http://developer.android.com/guide/publishing/publishing.html#marketintent" rel="noreferrer">market link</a> 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.

blocks|key|1315110|text|现在，在最新版本的android免费试用订阅已经添加，您可以解锁您的应用程序的所有功能，只有在app内购买订阅免费试用期。这将允许用户在试用期内使用您的应用程序，如果应用程序在试用期后仍未安装，则订阅费将转移到您身上。我没有尝试过，只是分享了一个想法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1315111|Here's+documentation|offset|length|1315112|entityMap|0|LINK|mutability|MUTABLE|url|http://developer.android.com/google/play/billing/billing_subscriptions.html#administering^0|0|0|K|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

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.

<a href="http://developer.android.com/google/play/billing/billing_subscriptions.html#administering" rel="nofollow">Here's documentation</a>

blocks|key|1315206|text|我在搜索同样的问题时遇到了这个问题，我认为我们可以利用免费的date+api，如http://www.timeapi.org/utc/now或其他一些date+api来检查试用应用程序的过期。如果您希望交付演示，并且担心付款和需要修复保留期演示，则此方法是有效的。:)|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1315207|找到下面的代码|1315208|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+"+%2B+timestampinMillies);
++++++++System.out.println("system+time+-"+%2B+(base_date+%2B+expiryInMillies));
++++++++if+(timestampinMillies+>+(base_date+%2B+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+%7C%7C+result.length()+==+0+%7C%7C+result.indexOf("<timestamp>")+==+-1+%7C%7C+result.indexOf("</timestamp>")+==+-1)+{
++++++++++++System.out.println("Error+$$$$$$$$$");
++++++++}+else+{
++++++++++++String+strTime+=+result.substring(result.indexOf("<timestamp>")+%2B+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

}
}|code-block|syntax|javascript|1315209|它的工作解决方案……|1315210|entityMap|0|LINK|mutability|MUTABLE|url|http://www.timeapi.org/utc/now^0|14|U|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]]|C|$]]|$1|D|3|E|5|6|7|Y|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|Z|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|10|8|@]|9|@]|C|$]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]]]

I come across this question while searching for the same problem, i think we can utilize free date api like <a href="http://www.timeapi.org/utc/now" rel="nofollow">http://www.timeapi.org/utc/now</a> 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

<pre><code>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&amp;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 &gt; (base_date + expiryInMillies)) {
 showerrorDialog("Demo version expired please contact vendor support");
 System.out.println("expired");
 }
 }
}

private class CallAPI extends AsyncTask&lt;String, String, String&gt; {
 @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("&lt;timestamp&gt;") == -1 || result.indexOf("&lt;/timestamp&gt;") == -1) {
 System.out.println("Error $$$$$$$$$");
 } else {
 String strTime = result.substring(result.indexOf("&lt;timestamp&gt;") + 11, result.indexOf("&lt;/timestamp&gt;"));
 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

}
}
</code></pre>

its working solution.....

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?

Creating an Android trial application that expires after a fixed time period

数据库

服务器

我有一个应用程序，我想在市场上作为一个付费应用程序。我想有其他版本，这将是一个“试用”版本的时间限制，比如说，5天？我该怎么做呢？

问创建一个固定时间后过期的Android试用应用
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