package com.example.sam.scrollviewprac;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.ScrollView;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
    private TextView tvCount;
    private ScrollView scrollView;
    private LinearLayout linearLayout;
    private int count = 0;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        findViews();
        // Counter default value: 0
        this.tvCount.setText(Integer.toString(this.count));
    }

    private void findViews() {
        tvCount = (TextView)findViewById(R.id.tvCount);
        scrollView = (ScrollView)findViewById(R.id.scrollView);
        linearLayout = (LinearLayout)findViewById(R.id.linearLayout);
    }

    public void onAddClick(View view){
        this.count++;
        this.tvCount.setText(Integer.toString(this.count));
        TextView textView = new TextView(this);
        textView.setText(Integer.toString(this.count) + ": This is a line.");
        this.linearLayout.addView(textView);
        // first updated and then scrolls to the "new" bottom
        scrollView.postDelayed(new Runnable(){
            @Override
            public void run() {
                scrollView.fullScroll(View.FOCUS_DOWN);
            }
        }, 100);
    }
}