Class for check version instaled in Android App

app.java

import android.content.Context;
import android.content.SharedPreferences;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;

public class App {
	public static final String PREFERENCE_APP_KEY = "com.my.app.APP_PREFERENCE_PRIVATE";
	public static final String PREFERENCE_VERSION_KEY = "com.my.app.APP_VERSION";
	
	public static boolean setVersion(Context ctx){
		long v = getVersion(ctx);
		boolean out = false;
		if(v>0){
			SharedPreferences prf = getPreferences(ctx);
			out = prf.edit().putLong(PREFERENCE_APP_KEY, v).commit();
		}
		
		return out;
	};
	
	public static long getVersion(Context ctx){
		long v = 0L;
		PackageInfo pInfo;

		try {
			pInfo 	= getPackageInfo(ctx);
			v		= pInfo.versionCode;
		} catch (NameNotFoundException e) {
			e.printStackTrace();
		}
		return v;
	}
	
	public static long getVersionInstalled(Context ctx){
		SharedPreferences prf = getPreferences(ctx);
		return prf.getLong(PREFERENCE_VERSION_KEY, 0L);
	}
	
	public static SharedPreferences getPreferences(Context ctx){
		return ctx.getApplicationContext().getSharedPreferences(PREFERENCE_APP_KEY,
				Context.MODE_PRIVATE);
	}
	
	public static PackageInfo getPackageInfo(Context ctx) throws NameNotFoundException{
		return ctx.getPackageManager().getPackageInfo(ctx.getPackageName(), PackageManager.GET_META_DATA);
	}
	
}

Example Use:

long versionInstalled = App.getVersionInstalled(this);
long current_v = App.getVersion(this);
if( versionInstalled  != current_v ){
    Log.w("MOV", "No veresion valid");  
}