Delay/laggy reading text file from assets folder

See more:

Java

Mobile

Android

I am trying to read a text file from assets folder which is present in my application folder .
Everything is working perfectly when i click on my button to display the activity with the text file
it experiences delay of 2-3 mins before displaying.

this is my code below kindly help

public class AssetsReader extends ActionBarActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_assets_reader);

TextView txtContent=(TextView)findViewById(R.id.tv1);
TextView txtFileName=(TextView)findViewById(R.id.tv2);
ImageView iv=(ImageView)findViewById(R.id.iv);

AssetManager assetManager=getAssets();

try {

String[] files=assetManager.list("Files");

for (int i = 0; i < files.length; i++) {

txtContent.append("\n Files=>"+i+"Name"+files);
}

} catch (Exception e) {
// TODO: handle exception

e.printStackTrace();
}

InputStream input;

try {

input=assetManager.open("vocab.txt");

int size=input.available();

byte[] buffer=new byte[size];
input.read(buffer);
input.close();

String text=new String(buffer);

txtFileName.setText(text);

} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}

try {

InputStream in=assetManager.open("vocab.jpg");

Drawable d= Drawable.createFromStream(in, null);
iv.setImageDrawable(d);

} catch (Exception e) {
// TODO: handle exception
return;
}
}