package ru.wadman.reference;

import android.app.Activity;
import android.content.res.AssetManager;
import android.text.AndroidCharacter;
import android.view.View;
import android.widget.ProgressBar;
import android.widget.ScrollView;
import android.widget.TextView;

import org.androidannotations.annotations.AfterViews;
import org.androidannotations.annotations.Background;
import org.androidannotations.annotations.EActivity;
import org.androidannotations.annotations.UiThread;
import org.androidannotations.annotations.ViewById;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;

@EActivity(R.layout.activity_main)
public class MainActivity extends Activity {

    @ViewById(R.id.progressBar)
    ProgressBar progressBar;
    @ViewById(R.id.scrollView)
    ScrollView scrollView;
    @ViewById(R.id.textView)
    TextView textView;

    String text;

    @AfterViews
    void init() {
        showProgress();
        loadText();
    }

    @Background
    void loadText() {
        InputStream inputStream = getBaseContext().getResources().openRawResource(R.raw.akush1);
        StringBuilder sb = new StringBuilder();

        InputStreamReader inputreader = null;
        try {
            inputreader = new InputStreamReader(inputStream, "windows-1251");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        if (inputreader != null) {
            BufferedReader buffreader = new BufferedReader(inputreader);
            String line;

            try {
                while ((line = buffreader.readLine()) != null) {
                    sb.append(line);
                    sb.append('\n');
                }
            } catch (IOException e) {
                sb = null;
            }
        }
        if (sb != null) {
            text = sb.toString().trim();
        }
        doneLoad();
    }

    @UiThread
    void doneLoad() {
        if (text != null){
            textView.setText(text);
        } else {
            textView.setText("");
        }
        text = null;
        showText();
    }

    void showProgress() {
        scrollView.setVisibility(View.INVISIBLE);
        progressBar.setVisibility(View.VISIBLE);
    }

    void showText() {
        scrollView.setVisibility(View.VISIBLE);
        progressBar.setVisibility(View.INVISIBLE);
    }

}

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
                android:layout_width="match_parent"
                android:layout_height="match_parent">

    <ProgressBar
        style="?android:attr/progressBarStyleLarge"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/progressBar"
        android:layout_centerVertical="true"
        android:layout_centerHorizontal="true"
        android:visibility="visible"/>

    <ScrollView
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:id="@+id/scrollView"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:visibility="invisible">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="New Text"
            android:id="@+id/textView"/>
    </ScrollView>
</RelativeLayout>