Di Chuyen View trong Android

package com.example.testdemonhat;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.ScrollView;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    ScrollView scrTest;
    TextView txtHandler;
    LinearLayout lnlTest;
    int y, h;//, scrollY;

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

        init();
    }

    void init() {
        scrTest = (ScrollView) findViewById(R.id.scrTest);
        txtHandler = (TextView) findViewById(R.id.txtHandler);
        lnlTest = (LinearLayout) findViewById(R.id.lnlTest);
        scrTest.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                if (event.getAction() == MotionEvent.ACTION_DOWN) {
                    Log.e("Mao", "Mao Bang" + event.getRawX());
                    Log.e("Mao", "Mao Bang" + event.getRawY());
                    int[] lc = new int[2];
                    txtHandler.getLocationOnScreen(lc);
                    if (event.getRawX() > lc[0] && event.getRawX() < lc[0] + txtHandler.getWidth() &&
                            event.getRawY() > lc[1] && event.getRawY() < lc[1] + txtHandler.getHeight()) {
                        y = (int) event.getRawY();
                        h = scrTest.getHeight();
//                        scrollY = scrTest.getScrollY();
                    }
                    return true;
                } else if (event.getAction() == MotionEvent.ACTION_MOVE) {
                    Log.e("Mao", "Mao Khong Bang");
                    if (y != -1) {
                        RelativeLayout.LayoutParams lp = (RelativeLayout.LayoutParams) scrTest.getLayoutParams();
                        int subtract = (int) event.getRawY() - y;
                        lp.height = h + subtract;
                        scrTest.setLayoutParams(lp);
//                        int sy;
//                        if ((subtract < 0))
//                            sy = Math.abs(subtract);
//                        else
//                            sy = scrTest.getScrollY();
                        int sy;
                        if ((subtract < 0))
                            sy = Math.abs(subtract);
                        else
                            sy = scrTest.getScrollY();
                        scrTest.scrollTo(scrTest.getScrollX(), sy);

                        scrTest.scrollTo(scrTest.getScrollX(), sy);
                        return true;
                    }
                } else if (event.getAction() == MotionEvent.ACTION_UP) {
                    y = -1;
                    return true;
                }
                return false;
            }
        });
    }

}