BaseActivity

package net.wwls.dimarabah;

import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Bundle;
import android.os.PersistableBundle;
import android.os.Vibrator;
import android.support.v7.app.AppCompatActivity;
import android.widget.Toast;

import com.google.zxing.integration.android.IntentIntegrator;

/**
 * Created by Mohammed on 17/02/2016.
 */
public abstract class BaseActivity extends AppCompatActivity {

    private static final long VIBRATION_TIME = 500;

    @Override
    public void onCreate(Bundle savedInstanceState, PersistableBundle persistentState) {
        super.onCreate(savedInstanceState, persistentState);
    }

    protected void launchScanner () {
        IntentIntegrator integrator = new IntentIntegrator(this);
        integrator.setBeepEnabled(false);
        integrator.setPrompt(getString(R.string.scan_card));
        integrator.initiateScan();
    }

    protected void makeToast(String contents) {
        Toast.makeText(this, contents, Toast.LENGTH_LONG).show();
    }

    protected void showAlert ( String message ) {
        AlertDialog.Builder builder1 = new AlertDialog.Builder(this);
        builder1.setMessage( message );
        builder1.setCancelable(true);
        builder1.setPositiveButton("Ok",
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int id) {
                        dialog.cancel();
                    }
                }
        );

        AlertDialog alert11 = builder1.create();
        alert11.show();
    }

    /**
     * Things should be done before scanning
     * @author Mohammed JEMMOUDI
     * @return void
     */
    abstract protected void beforeScan();

    /**
     * Things should be done after scanning
     * @author Mohammed JEMMOUDI
     * @return void
     */
    abstract protected void afterScan();

    /**
     * launch scanning process with some extra jobs (before & after scan)
     * @author Mohammed JEMMOUDI
     * @return void
     */
    protected void customScan( String prompt ) {
        beforeScan();

        IntentIntegrator integrator = new IntentIntegrator(this);
        integrator.setBeepEnabled(false);
        integrator.setPrompt(getString(R.string.scan_card));
        integrator.initiateScan();

        afterScan();
    }

    protected void vibrate() {
        Vibrator v = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
        v.vibrate(VIBRATION_TIME);
    }

    private boolean hasActiveConnection () {
        ConnectivityManager cm = (ConnectivityManager) this.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo ni = cm.getActiveNetworkInfo();
        // There are no active networks.
        return ni != null && ni.isConnected();
    }

}