package com.example.demo;import androidx.appcompat.app.AppCompatActivity;import android.os.Bundle;import android.view.MotionEvent;import android.view.View;import android.view.ViewGroup;import android.widget.LinearLayout;/** * @author Huang xudong * @date 2020/7/26 */public class MainActivity extends AppCompatActivity {    private LinearLayout view;    /**     * 定义你的View最大高度，maybe set max PHONE height     * 这里设置最大值，防止底部还有组件     */    private int maxTopHeight=5000;    /**     * 获取控件的默认高度，当下滑最小高度的时候不再滑动了     */    private int defaultHeight=0;    /**     * 这里设置的组属性     */    private ViewGroup.LayoutParams layoutParams;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        view=findViewById(R.id.ll_main);        layoutParams = view.getLayoutParams();        defaultHeight=layoutParams.height;        /**         * 注册view滑动事件,可以选择其他的，比喻指定的组件         */        view.setOnTouchListener(new View.OnTouchListener() {            int y=0;            @Override            public boolean onTouch(View v, MotionEvent event) {                switch (event.getAction()){                    case MotionEvent.ACTION_DOWN:                        y= (int) event.getRawY();                        break;                    case MotionEvent.ACTION_MOVE:                        int lastY= (int) event.getRawY();                        if (lastY-y>0){                            if (layoutParams.height>defaultHeight){                                layoutParams.height=layoutParams.height-Math.abs(lastY-y)/20;                                view.setLayoutParams(layoutParams);                            }                        }else {                            if (layoutParams.height

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