安卓ViewPager中嵌套ViewPager的滑动冲突解决，定时器实现ViewPager的无限左右滑动。

时间：2022-12-16 22:39:25
整个项目的文件
安卓ViewPager中嵌套ViewPager的滑动冲突解决，定时器实现ViewPager的无限左右滑动。
MainActivity中
package com.example.tm.myapplication;

import android.support.v4.app.Fragment;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity{


    ViewPager parentViewpager;
    List<Fragment> fragments;


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

private static final String TAG = "MainActivity";
private void initData() {
fragments=new ArrayList<>();
        FirstFragment firstFragment=new FirstFragment();
        SecondFragment secondFragment=new SecondFragment();
        ThirdFragment thirdFragment=new ThirdFragment();
fragments.add(firstFragment);
fragments.add(secondFragment);
fragments.add(thirdFragment);
        ParentAdapter adapter=new ParentAdapter(getSupportFragmentManager(),fragments);
parentViewpager.setAdapter(adapter);
    }


private void initView() {
parentViewpager= (ViewPager) findViewById(R.id.parent_viewPager);
    }
}
FirstFragment中
package com.example.tm.myapplication;


import android.os.Bundle;
import android.os.Handler;
import android.support.v4.app.Fragment;
import android.support.v4.view.ViewPager;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;


public class FirstFragment extends Fragment {

private static final String TAG = "FirstFragment";
private View view;
private ChildViewpager childViewpager;
private List<ImageView> data;
private int[] imageArray={R.mipmap.first,R.mipmap.second,R.mipmap.third,R.mipmap.forth,R.mipmap.fifth};
private int maxCount=5000;

//启动一个定时器
    private Handler handler=new Handler();
private Runnable runnable=new Runnable() {
@Override
        public void run() {
            Log.i(TAG, "run: 进入了定时器");
childViewpager.setCurrentItem(maxCount++);
handler.postDelayed(this,2000);//这一句是表示开启定时器的循环
        }
    };

public FirstFragment() {
    }


@Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
view = inflater.inflate(R.layout.fragment_first, container, false);
childViewpager= (ChildViewpager) view.findViewById(R.id.child_viewPager);
        initData();
return view;
    }

private void initData() {
data=new ArrayList<>();
for(int i=0;i<5;i++){
            ImageView imageView=new ImageView(getActivity());
            imageView.setBackgroundResource(imageArray[i]);
final int j=i;
            imageView.setOnClickListener(new View.OnClickListener() {
@Override
                public void onClick(View view) {
                    Toast.makeText(getActivity(), "点击"+j, Toast.LENGTH_SHORT).show();
                }
            });
data.add(imageView);
        }
        ChildAdapter adapter=new ChildAdapter(data,getActivity());
childViewpager.setAdapter(adapter);
childViewpager.setCurrentItem(maxCount);//设置一个比较大的数用来为viewpager初始化第一个页面
        childViewpager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
                Log.i(TAG, "onPageScrolled: position"+position);
handler.removeCallbacks(runnable);
maxCount=position;//由于setCurrent（）方法每次只能比原来的position多一个，所以将现在的position记录下来，为累加做初值
                handler.postDelayed(runnable,2000);
            }

@Override
            public void onPageSelected(int position) {
            }

@Override
            public void onPageScrollStateChanged(int state) {
            }
        });
handler.removeCallbacks(runnable);
handler.postDelayed(runnable,2000);
    }

@Override
    public void onPause() {
super.onPause();
handler.removeCallbacks(runnable);
    }

@Override
    public void onResume() {
super.onResume();
handler.postDelayed(runnable,2000);
    }
}
SecondFragment中 
package com.example.tm.myapplication;import android.os.Bundle;import android.support.v4.app.Fragment;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;public class SecondFragment extends Fragment {    public SecondFragment() {    }    @Override    public View onCreateView(LayoutInflater inflater, ViewGroup container,                             Bundle savedInstanceState) {        return inflater.inflate(R.layout.fragment_second, container, false);    }}
ThirdFragment中
package com.example.tm.myapplication;import android.os.Bundle;import android.support.v4.app.Fragment;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;public class ThirdFragment extends Fragment {    public ThirdFragment() {    }    @Override    public View onCreateView(LayoutInflater inflater, ViewGroup container,                             Bundle savedInstanceState) {        return inflater.inflate(R.layout.fragment_third, container, false);    }}
ChildAdapter中
package com.example.tm.myapplication;import android.content.Context;import android.support.v4.view.PagerAdapter;import android.util.Log;import android.view.View;import android.view.ViewGroup;import android.widget.ImageView;import java.util.List;public class ChildAdapter extends PagerAdapter {    private List<ImageView> data;    private Context context;    private static final String TAG = "ChildAdapter";    public ChildAdapter(List<ImageView> data, Context context) {        this.data = data;        this.context = context;    }    @Override    public int getCount() {        //规定viewpager的最大页数        return Integer.MAX_VALUE;    }    @Override    public boolean isViewFromObject(View view, Object object) {        return view==object;    }    @Override    public void destroyItem(ViewGroup container, int position, Object object) {        Log.i(TAG, "destroyItem: 销毁了一个item");        container.removeView(data.get((position)%data.size()));    }    @Override    public Object instantiateItem(ViewGroup container, int position) {//position是0-4        Log.i(TAG, "instantiateItem: 新建了一个item");        container.addView(data.get(position%data.size()));        return data.get(position%data.size());    }}
ParentAdapter中 
package com.example.tm.myapplication;import android.support.v4.app.Fragment;import android.support.v4.app.FragmentManager;import android.support.v4.app.FragmentPagerAdapter;import java.util.List;public class ParentAdapter extends FragmentPagerAdapter {    private List<Fragment> data;    public ParentAdapter(FragmentManager fm,List<Fragment> data) {        super(fm);        this.data=data;    }    @Override    public Fragment getItem(int position) {        return data.get(position);    }    @Override    public int getCount() {        int ret=0;        if(data!=null){            ret=data.size();        }        return ret;    }}
ChildViewPager中（该文件是引用别人的地址是：http://blog.csdn.net/leewenjin/article/details/21011841）
package com.example.tm.myapplication;import android.content.Context;import android.graphics.PointF;import android.support.v4.view.ViewPager;import android.text.style.ClickableSpan;import android.util.AttributeSet;import android.util.Log;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) {        super(context);    }    public ChildViewpager(Context context, AttributeSet attrs) {        super(context, attrs);    }    private static final String TAG = "ChildViewpager";    @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        if(getChildCount()<=1)        {            return super.onTouchEvent(arg0);        }        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 || arg0.getAction() == MotionEvent.ACTION_CANCEL){            //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            getParent().requestDisallowInterceptTouchEvent(false);            if(downP.x==curP.x && downP.y==curP.y){                return true;            }        }        super.onTouchEvent(arg0); //注意这句不能 return super.onTouchEvent(arg0); 否则触发parent滑动        return true;    }}
布局文件：
activity_main.xml中
<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context="com.example.tm.myapplication.MainActivity">    <android.support.v4.view.ViewPager        android:id="@+id/parent_viewPager"        android:layout_width="match_parent"        android:layout_height="match_parent">    </android.support.v4.view.ViewPager></RelativeLayout>
fragment_first中
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:background="#0f0"    tools:context="com.example.tm.myapplication.FirstFragment">    <com.example.tm.myapplication.ChildViewpager        android:id="@+id/child_viewPager"        android:layout_width="match_parent"        android:layout_height="200dp"        />    <TextView        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="@string/hello_blank_fragment"        android:gravity="center"        android:layout_marginTop="300dp"/></FrameLayout>
fragment_second中
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context="com.example.tm.myapplication.SecondFragment">    <TextView        android:layout_width="match_parent"        android:layout_height="match_parent"        android:text="@string/hello_blank_fragment"        android:gravity="center"        android:background="#00f"/></FrameLayout>
fragment_third中
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context="com.example.tm.myapplication.ThirdFragment">    <TextView        android:layout_width="match_parent"        android:layout_height="match_parent"        android:text="@string/hello_blank_fragment"        android:gravity="center"        android:background="#f00"/></FrameLayout>

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