Apps How to I implement a barcodscanner using the interfaces of Java in android

[Okaid Oksa]

This is my MainActivity Class:
package barscanner.sitf.barskender;

import android.content.Intent;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity{

@override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);

FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@override
public void onClick(View view) {
// Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
// .setAction("Action", null).show();

BarCodeReader reader = new BarCodeReader(MainActivity.this);
//reader.setOnClickListener();
reader.init();


}
});
}

@override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}

@override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();

//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}

return super.onOptionsItemSelected(item);
}



}

-------------------------------------------------------------------------

This is my other class BarCodeScanner.java




package barscanner.sitf.barskender;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.widget.TextView;

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


public class BarCodeReader implements BarCodeInterface {

private Context mContext;
private BarCodeReader result;

public BarCodeReader(Context context) {
this.mContext = context;
}


public void init()
{
new IntentIntegrator((Activity)mContext).initiateScan(IntentIntegrator.ALL_CODE_TYPES);
}


@override
public BarCodeReader onResult() {
return result;
}
}

------------------------------------------------------------------------
And this is my interface class


package barscanner.sitf.barskender;

import android.content.Intent;
import android.widget.TextView;

/**
* Created by Oket on 4/8/2016.
*/






public interface BarCodeInterface {


public BarCodeReader onResult();


}

----------------------------------------------------------

Im trying to call initiate a call using the interface class, and I tried several ways, but non of them functioned.

Can someone some tips on this issue?


Thnx a lot