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AppStart - Check if started for the first time Android
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| /** | |
| * Distinguishes different kinds of app starts: <li> | |
| * <ul> | |
| * First start ever ({@link #FIRST_TIME}) | |
| * </ul> | |
| * <ul> | |
| * First start in this version ({@link #FIRST_TIME_VERSION}) | |
| * </ul> | |
| * <ul> | |
| * Normal app start ({@link #NORMAL}) | |
| * </ul> | |
| * | |
| * @author williscool | |
| * inspired by | |
| * @author schnatterer | |
| * | |
| */ | |
| public enum AppStart { | |
| FIRST_TIME, FIRST_TIME_VERSION, NORMAL; | |
| } | |
| /** | |
| * The app version code (not the version name!) that was used on the last | |
| * start of the app. | |
| */ | |
| private static final String LAST_APP_VERSION = "1"; | |
| /** | |
| * Caches the result of {@link #checkAppStart(Context context, SharedPreferences sharedPreferences)}. To allow idempotent method | |
| * calls. | |
| */ | |
| private static AppStart appStart = null; | |
| /** | |
| * Finds out started for the first time (ever or in the current version). | |
| * | |
| * @return the type of app start | |
| */ | |
| public AppStart checkAppStart(Context context, SharedPreferences sharedPreferences) { | |
| PackageInfo pInfo; | |
| try { | |
| pInfo = context.getPackageManager().getPackageInfo( | |
| context.getPackageName(), PackageManager.COMPONENT_ENABLED_STATE_DEFAULT); | |
| int lastVersionCode = sharedPreferences.getInt( | |
| LAST_APP_VERSION, -1); | |
| // String versionName = pInfo.versionName; | |
| int currentVersionCode = pInfo.versionCode; | |
| appStart = checkAppStart(currentVersionCode, lastVersionCode); | |
| // Update version in preferences | |
| sharedPreferences.edit() | |
| .putInt(LAST_APP_VERSION, currentVersionCode).commit(); // must use commit here or app may not update prefs in time and app will loop into walkthrough | |
| } catch (PackageManager.NameNotFoundException e) { | |
| Log.w(TAG, | |
| "Unable to determine current app version from package manager. Defensively assuming normal app start."); | |
| } | |
| return appStart; | |
| } | |
| public AppStart checkAppStart(int currentVersionCode, int lastVersionCode) { | |
| if (lastVersionCode == -1) { | |
| return AppStart.FIRST_TIME; | |
| } else if (lastVersionCode < currentVersionCode) { | |
| return AppStart.FIRST_TIME_VERSION; | |
| } else if (lastVersionCode > currentVersionCode) { | |
| Log.w(TAG, "Current version code (" + currentVersionCode | |
| + ") is less then the one recognized on last startup (" | |
| + lastVersionCode | |
| + "). Defensively assuming normal app start."); | |
| return AppStart.NORMAL; | |
| } else { | |
| return AppStart.NORMAL; | |
| } | |
| } |
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| public class MainActivity extends Activity { | |
| private SharedPreferences sharedPreferences; | |
| @Override | |
| protected void onCreate(Bundle savedInstanceState) { | |
| super.onCreate(savedInstanceState); | |
| // you dont actually need the context variable | |
| // inside of an activity class you can pass it as this and that will work | |
| // it just reads a bit better | |
| context = this; | |
| sharedPreferences = PreferenceManager | |
| .getDefaultSharedPreferences(context); | |
| switch (checkAppStart(this,sharedPreferences)) { | |
| case NORMAL: | |
| // We don't want to get on the user's nerves | |
| break; | |
| case FIRST_TIME_VERSION: | |
| // TODO show what's new | |
| break; | |
| case FIRST_TIME: | |
| // TODO show a tutorial | |
| break; | |
| default: | |
| break; | |
| } | |
| // ... | |
| } | |
| // ... | |
| } |
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I am getting error in AppStart.java. How can you create this java file without any class in it.