ViewPager嵌套及U型原则

浅浅的花香味﹌ 2024-02-17 16:05 3阅读 0赞

mainactivity

package com.example.viewpageru_tenet;
    
    import java.util.ArrayList;
    import java.util.List;
    
    import android.app.Activity;
    import android.graphics.Color;
    import android.os.Bundle;
    import android.support.v4.view.ViewPager;
    import android.view.View;
    
    /**
     * viewpager的创建
     */
    
    public class MainActivity extends Activity {
        private List<View> datas, datas_child;
        private ViewPager vp1;
        private MyAdapter adapter;
        private int colors[] = { Color.BLACK, Color.BLUE, Color.GREEN };
        private int colors2[] = { Color.GREEN, Color.RED, Color.GRAY };
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            initview();
            initDatas();
            adapter = new MyAdapter(datas);
            vp1.setAdapter(adapter);
        }
    
        private void initDatas() {
            // TODO Auto-generated method stub
            datas = new ArrayList<View>();
            View v1 = getLayoutInflater().inflate(R.layout.item_vp, null);
            datas_child = new ArrayList<View>();
            View v01 = getLayoutInflater().inflate(R.layout.item_childvp, null);
            v01.findViewById(R.id.item_childvp_view).setBackgroundColor(colors[0]);
            datas_child.add(v01);
            View v02 = getLayoutInflater().inflate(R.layout.item_childvp, null);
            v02.findViewById(R.id.item_childvp_view).setBackgroundColor(colors[1]);
            datas_child.add(v02);
            View v03 = getLayoutInflater().inflate(R.layout.item_childvp, null);
            v03.findViewById(R.id.item_childvp_view).setBackgroundColor(colors[2]);
            datas_child.add(v03);
            adapter = new MyAdapter(datas_child);
            ((ChildViewPager) (v1.findViewById(R.id.item_vp_child)))
                    .setAdapter(adapter);
    //      ((View) (v1.findViewById(R.id.item_vp_view)))
    //              .setBackgroundColor(colors2[0]);
            datas.add(v1);
    
            View v2 = getLayoutInflater().inflate(R.layout.item_vp, null);
            ((View) (v2.findViewById(R.id.item_vp_view)))
                    .setBackgroundColor(colors2[1]);
            datas.add(v2);
    
            View v3 = getLayoutInflater().inflate(R.layout.item_vp, null);
            ((View) (v3.findViewById(R.id.item_vp_view)))
                    .setBackgroundColor(colors2[2]);
            datas.add(v3);
    
        }
    
        private void initview() {
            // TODO Auto-generated method stub
            vp1 = (ViewPager) findViewById(R.id.main_vp);
        }
    
    }
    适配器myadapter

package com.example.viewpageru\_tenet;

import java.util.List;

import android.support.v4.view.PagerAdapter;  
import android.view.View;  
import android.view.ViewGroup;

public class MyAdapter extends PagerAdapter \{  
private List datas;

public MyAdapter(List<View> datas) {
        super();
        this.datas = datas;
    }
    
    @Override
    public int getCount() {
        // TODO Auto-generated method stub
        return datas.size();
    }
    
    @Override
    public boolean isViewFromObject(View arg0, Object arg1) {
        // TODO Auto-generated method stub
        return arg0==arg1;
    }
    
    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
        // TODO Auto-generated method stub
        container.removeView(datas.get(position));
    }
    
    @Override
    public Object instantiateItem(ViewGroup container, int position) {
        // TODO Auto-generated method stub
        container.addView(datas.get(position));
        return datas.get(position);
    }

子viewpager childviewpager

package com.example.viewpageru_tenet;
    
    import android.content.Context;
    import android.graphics.PointF;
    import android.support.v4.view.ViewPager;
    import android.util.AttributeSet;
    import android.view.MotionEvent;
    
    public class ChildViewPager extends ViewPager {
        
        /** 触摸时按下的点 **/
        PointF downP = new PointF();
        /** 触摸时当前的点 **/
        PointF curP = new PointF();
        OnSingleTouchListener onSingleTouchListener;
    
        public ChildViewPager(Context context, AttributeSet attrs) {
            super(context, attrs);
            // TODO Auto-generated constructor stub
        }
    
        public ChildViewPager(Context context) {
            super(context);
            // TODO Auto-generated constructor stub
        }
    
        @Override
        public boolean onInterceptTouchEvent(MotionEvent arg0) {
            // TODO Auto-generated method stub
            // 当拦截触摸事件到达此位置的时候，返回true，
            // 说明将onTouch拦截在此控件，进而执行此控件的onTouchEvent
            return true;
        }
    
        //
        @Override
        protected void onPageScrolled(int arg0, float arg1, int arg2) {
            // TODO Auto-generated method stub
            super.onPageScrolled(arg0, arg1, arg2);
            if (arg0 == 2) {
                getParent().requestDisallowInterceptTouchEvent(false);
            }
        }
    
        @Override
        public boolean onTouchEvent(MotionEvent arg0) {
            // TODO Auto-generated method stub
            // 每次进行onTouch事件都记录当前的按下的坐标
            curP.x = arg0.getX();
            curP.y = arg0.getY();
    
            if (arg0.getAction() == MotionEvent.ACTION_DOWN) {
                // 记录按下时候的坐标
                // 切记不可用 downP = curP ，这样在改变curP的时候，downP也会改变
                downP.x = arg0.getX();
                downP.y = arg0.getY();
                // 此句代码是为了通知他的父ViewPager现在进行的是本控件的操作，不要对我的操作进行干扰
                getParent().requestDisallowInterceptTouchEvent(true);
            }
    
            if (arg0.getAction() == MotionEvent.ACTION_MOVE) {
                // 此句代码是为了通知他的父ViewPager现在进行的是本控件的操作，不要对我的操作进行干扰
                getParent().requestDisallowInterceptTouchEvent(true);
            }
    
            if (arg0.getAction() == MotionEvent.ACTION_UP) {
                // 在up时判断是否按下和松手的坐标为一个点
                // 如果是一个点，将执行点击事件，这是我自己写的点击事件，而不是onclick
                if (downP.x == curP.x && downP.y == curP.y) {
                    onSingleTouch();
                    return true;
                }
            }
    
            return super.onTouchEvent(arg0);
        }
    
        /**
         * 单击
         */
        public void onSingleTouch() {
            if (onSingleTouchListener != null) {
    
                onSingleTouchListener.onSingleTouch();
            }
        }
    
        /**
         * 创建点击事件接口
         * 
         * @author wanpg
         * 
         */
        public interface OnSingleTouchListener {
        
            public void onSingleTouch();
        }
    
        public void setOnSingleTouchListener(
                OnSingleTouchListener onSingleTouchListener) {
            this.onSingleTouchListener = onSingleTouchListener;
        }
    
    }

xml配置文件