neubanks89
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I just finished license protecting all my apps using Google's relatively new license service. I've developed an easy way to manage this in all your applications without having to mess with any of your apps actual source code.
Before you start, Make you have included the license library in your project as explained here:
Licensing Your Applications | Android Developers
1. Make a new Activity in your project called LicenseCheck.java
2. Paste the following in that activity:
3. Change the Base Key to the one google provided, Place 20 random integers in the SALT, Change MainActivity.class to the Main Activity of your application.
4. Update your Manifest File with the new activity
5. Add Permission In the manifest Tag but not in the application tag
You're all done! Make sure you test it out before publishing.
Before you start, Make you have included the license library in your project as explained here:
Licensing Your Applications | Android Developers
1. Make a new Activity in your project called LicenseCheck.java
2. Paste the following in that activity:
Code:
/**
* @author Nick Eubanks
*
* Copyright (C) 2010 Android Infinity (http://www.androidinfinity.com)
*
*/
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.provider.Settings.Secure;
import android.widget.Toast;
import com.android.vending.licensing.AESObfuscator;
import com.android.vending.licensing.LicenseChecker;
import com.android.vending.licensing.LicenseCheckerCallback;
import com.android.vending.licensing.ServerManagedPolicy;
/**
* NOTES ON USING THIS LICENSE FILE IN YOUR APPLICATION:
* 1. Define the package
* of you application above
* 2. Be sure your public key is set properly @BASE64_PUBLIC_KEY
* 3. Change your SALT using random digits
* 4. Under AllowAccess, Add your previously used MainActivity
* 5. Add this activity to
* your manifest and set intent filters to MAIN and LAUNCHER
* 6. Remove Intent Filters from previous main activity
*/
public class LicenseCheck extends Activity {
private class MyLicenseCheckerCallback implements LicenseCheckerCallback {
@Override
public void allow() {
if (isFinishing()) {
// Don't update UI if Activity is finishing.
return;
}
// Should allow user access.
startMainActivity();
}
@Override
public void applicationError(ApplicationErrorCode errorCode) {
if (isFinishing()) {
// Don't update UI if Activity is finishing.
return;
}
// This is a polite way of saying the developer made a mistake
// while setting up or calling the license checker library.
// Please examine the error code and fix the error.
toast("Error: " + errorCode.name());
startMainActivity();
}
@Override
public void dontAllow() {
if (isFinishing()) {
// Don't update UI if Activity is finishing.
return;
}
// Should not allow access. In most cases, the app should assume
// the user has access unless it encounters this. If it does,
// the app should inform the user of their unlicensed ways
// and then either shut down the app or limit the user to a
// restricted set of features.
// In this example, we show a dialog that takes the user to Market.
showDialog(0);
}
}
private static final String BASE64_PUBLIC_KEY = "PLACE YOUR BASE KEY FROM GOOGLE HERE";
private static final byte[] SALT = new byte[] { INPUT 20 RANDOM INTEGERS HERE };
private LicenseChecker mChecker;
// A handler on the UI thread.
private LicenseCheckerCallback mLicenseCheckerCallback;
private void doCheck() {
mChecker.checkAccess(mLicenseCheckerCallback);
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Try to use more data here. ANDROID_ID is a single point of attack.
String deviceId = Secure.getString(getContentResolver(),
Secure.ANDROID_ID);
// Library calls this when it's done.
mLicenseCheckerCallback = new MyLicenseCheckerCallback();
// Construct the LicenseChecker with a policy.
mChecker = new LicenseChecker(this, new ServerManagedPolicy(this,
new AESObfuscator(SALT, getPackageName(), deviceId)),
BASE64_PUBLIC_KEY);
doCheck();
}
@Override
protected Dialog onCreateDialog(int id) {
// We have only one dialog.
return new AlertDialog.Builder(this)
.setTitle("Application Not Licensed")
.setCancelable(false)
.setMessage(
"This application is not licensed. Please purchase it from Android Market")
.setPositiveButton("Buy App",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
Intent marketIntent = new Intent(
Intent.ACTION_VIEW,
Uri.parse("http://market.android.com/details?id="
+ getPackageName()));
startActivity(marketIntent);
finish();
}
})
.setNegativeButton("Exit",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
finish();
}
}).create();
}
@Override
protected void onDestroy() {
super.onDestroy();
mChecker.onDestroy();
}
private void startMainActivity() {
startActivity(new Intent(this, MainActivity.class)); //REPLACE MainActivity.class WITH YOUR APPS ORIGINAL LAUNCH ACTIVITY
finish();
}
public void toast(String string) {
Toast.makeText(this, string, Toast.LENGTH_SHORT).show();
}
}3. Change the Base Key to the one google provided, Place 20 random integers in the SALT, Change MainActivity.class to the Main Activity of your application.
4. Update your Manifest File with the new activity
Code:
<!-- Old Launch Activity Here -->
<activity android:label="@string/app_name" android:name=".MainActivity" />
<!-- New License Launch Activity with all intent filters from your previous main activity -->
<!-- Translucent.NoTitleBar is so that this activity is never shown to the user -->
<activity android:label="@string/app_name" android:name=".LicenseCheck"
android:theme="@android:style/Theme.Translucent.NoTitleBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>5. Add Permission In the manifest Tag but not in the application tag
Code:
</application>
<uses-permission android:name="com.android.vending.CHECK_LICENSE" />
</manifest>You're all done! Make sure you test it out before publishing.
