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java – Detect Android app upgrade and set Application class boolean for show/hide of EULA

Posted by: admin April 23, 2020 Leave a comment

Questions:

I’m attempting to detect when my application has been upgraded using a BroadcastReceiver and set a boolean in my Application Class. This boolean will be used in conjunction with a few other booleans to determine whether or not to show the EULA dialog box to the user.

I belive I’ve got it all setup correctly, but the EULA is still showing up when it shouldn’t. Specifically when the user has already accepted the EULA in a previous version, the EULA hasn’t changed in the version being upgraded to(Manually set by me), and the app is being upgraded.

I believe the reason this isn’t working is because my Application isn’t running and therefore the isAppUpgrade() method isn’t being called and setting the correct boolean flag. Can somebody confirm this is the case, or is there something wrong in my code?

FYI – The EULA.show(Activity, boolean, boolean) static method is being called first thing in my Main activity.

Here’s some code

Application Class

public class MFCApplication extends Application {

    private boolean isUpgrade = false;

    /**
     * Returns a manually set value of whether the EULA has changed in this version of the App
     * @return true/false
     */
    public boolean hasEULAChanged() {
        return false;
    }

    /**
     * Returns whether or not the application has been upgraded.  Set by the UpgradeBroadcastReceiver
     * @return true/false
     */
    public boolean isAppUpgrade() {
        return isUpgrade;
    }

    /**
     * Method called by UpgradeBroadcastReceiver if the App has been upgraded
     */
    public void setAppIsUpgrade() {
        this.isUpgrade = true;
    }
}

BroadcastReceiver

public class UpgradeBroadcastReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        if (intent == null)
            return;
        if (context == null)
            return;

        String action = intent.getAction();
        if (action == null)
            return;

        if (action.equals(Intent.ACTION_PACKAGE_REPLACED)) {
            MFCApplication myApp = ((MFCApplication)((Activity)context).getApplication());

            myApp.setAppIsUpgrade();
        }
    }
}

EULA Class

public class EULA {

    private static final String EULA_ASSET = "EULA";
    private static final String EULA_PREFERENCES = "eula";
    private static Activity mActivity;

    private static PackageInfo getPackageInfo() {
        PackageInfo pi = null;
        try {
            pi = mActivity.getPackageManager().getPackageInfo(mActivity.getPackageName(), PackageManager.GET_ACTIVITIES);
        } catch (PackageManager.NameNotFoundException ex) {
            ex.printStackTrace();
        }
        return pi;
    }

    public static boolean show(Activity activity, boolean hasEULAChanged, boolean isAppUpgrade) {
        mActivity = activity;
        final SharedPreferences preferences = activity.getSharedPreferences(EULA_PREFERENCES, Activity.MODE_PRIVATE);
        final PackageInfo packageInfo = getPackageInfo();
        String eulaPref = preferences.getString(EULA_PREFERENCES, "0");
        boolean eulaVersionAccepted = packageInfo.versionName.equals(eulaPref);
        if (!eulaVersionAccepted && (hasEULAChanged || !isAppUpgrade)) {
            //The EULA should be shown here, but it isn't
            return false;
        }
        return true;
    }
}

Application Manifest

<receiver android:name=".helpers.UpgradeBroadcastReceiver">
    <intent-filter>
        <action android:name="android.intent.action.PACKAGE_REPLACED" />
        <data android:scheme="package" android:path="com.hookedroid.fishingcompanion" />
    </intent-filter>
</receiver>
How to&Answers:

It’s much easier to just check your current app version.

PackageInfo packageInfo = activity.getPackageManager()
    .getPackageInfo(activity.getPackageName(), 0);
int versionCode = packageInfo.versionCode;

When your app starts, you check your SharedPreferences for an integer value with the version code. If there is none, or if it doesn’t match, display the EULA. After the user accepts the EULA, write the versionCode value to the SharedPreferences.

versionCode will match the version number you store in the Manifest.

Answer:

According to the original approach, I´ve managed it to detect if the app is upgraded by using BroadcastReceiver

public class YourUpgradeReceiver extends BroadcastReceiver{

    @Override
    public void onReceive(Context context, Intent intent) {
        Uri packageName = intent.getData();
        if(packageName.toString().equals("package:" + context.getPackageName())){
            //Application was upgraded
        }
    } 
}

And in your Manifest

 <receiver android:name=".YourUpgradeReceiver">
            <intent-filter>
                <action android:name="android.intent.action.PACKAGE_REPLACED"/>
                <data android:scheme="package"/>
            </intent-filter>
 </receiver>

Answer:

Detect If App Has Been Updated

SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(context);
int versionCode = sharedPreferences.getInt("VERSION_CODE", BuildConfig.VERSION_CODE);

if(versionCode != BuildConfig.VERSION_CODE) {
    onAppUpdated();
}

sharedPreferences.edit().putInt("VERSION_CODE", BuildConfig.VERSION_CODE).apply();

Answer:

Here is a simple way that can solve your problem.
In your code you can easily get the app versionCode and versionName. In first install after register GCM save the versionName in sharedPreferences. In your home activity you check isAppUpdated(). if current APP VERSION_NAME is not matched with stored VERSION_NAME then re-register the GCM ID.

Here is sample code:

Save VersionName in preferences:

public static void saveVersionNameAndCode(Context context){
        try{
            PackageInfo packageInfo = context.getPackageManager()
                    .getPackageInfo(context.getPackageName(), 0);
            int versionCode = packageInfo.versionCode;
            String versionName=packageInfo.versionName;

            CommonTasks.showLog("Saving APP VersionCode and Version Name");

            // SAVE YOUR DATA

        }catch(Exception e){
        }
    }

Check App is Upgraded:

public static boolean isAppUpdated(Context context){
        boolean result=false;
        try{
            PackageInfo packageInfo = context.getPackageManager()
                    .getPackageInfo(context.getPackageName(), 0);
            int versionCode = packageInfo.versionCode;
            String versionName=packageInfo.versionName;

            String prevVersionName= GET STORED VERSION_NAME;
            if(prevVersionName!=null && !prevVersionName.equals("") &&
                    !prevVersionName.equals(versionName)){
                showLog("App Updated");
                result=true;
            }else{
                showLog("App Not updated");
            }

        }catch(Exception e){
        }
        return result;
    }

here, if isAppUpdated() return true means you have to re-register GCM ID.

Answer:

Do not use app version itself, as app could be updated without EULA changing.
Provide a resource having a specific version for the EULA itself. Could be a string resource “eula_version”. With every change in EULA you update that string for your app’s update. onCreate of your activity you check the string in the resources against the string in the SharedPreferences. The simple approach is only to check against null or not equal. (The only downside that you would display EULA again after app downgrade or deinstallation/reinstallation).

public static boolean show(Activity activity, boolean hasEULAChanged, boolean isAppUpgrade) {
    mActivity = activity;
    final SharedPreferences preferences = activity.getSharedPreferences(EULA_PREFERENCES, Activity.MODE_PRIVATE);
    final PackageInfo packageInfo = getPackageInfo();
    String eulaPref = preferences.getString(EULA_PREFERENCES, "0"); //save on accept EULA Dialog click
    String eulaActive = getString(R.string.eula_version)
    return eulaPref==null || !eulaPref.equals(eulaActive);
}

Answer:

If you’re targeting API > 11, then the solution from @Marian Klühspies’s answer may be simplified. Registering the receiver:

<receiver
    android:name=".your.receivers.package.AppUpdateReceiver">
    <intent-filter>
        <action android:name="android.intent.action.MY_PACKAGE_REPLACED" />
    </intent-filter>
</receiver>

And the receiver itself:

class AppUpdateReceiver : BroadcastReceiver() {
    override fun onReceive(context: Context, intent: Intent) {
        if (intent.action == Intent.ACTION_MY_PACKAGE_REPLACED) {
            onAppUpdated()
        }
    }
}