android studio java Android开发笔记-Viewpager(2)的双联动效果

ViewPager(2)双联动效果

为了满足伸手党的需求，先贴上代码

源码

BaseLinkPageChangeListener.java

public class BaseLinkPageChangeListener implements ViewPager.OnPageChangeListener {

private final ViewPager linkViewPager;

private final ViewPager selfViewPager;

private int marginX = 0;

public BaseLinkPageChangeListener(ViewPager selfViewPager,ViewPager linkViewPager){

this.linkViewPager = linkViewPager;

this.selfViewPager = selfViewPager;

}

@Override

public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

//计算移动值

marginX = ((selfViewPager.getWidth() + selfViewPager.getPageMargin()) * position

+ positionOffsetPixels) * (linkViewPager.getWidth() + linkViewPager.getPageMargin()) /

(selfViewPager.getWidth() + selfViewPager.getPageMargin());

if (linkViewPager.getScrollX() != marginX) {

linkViewPager.scrollTo(marginX, 0);

}

}

@Override

public void onPageSelected(int position) {

}

@Override

public void onPageScrollStateChanged(int state) {

}

}

Activity.java

public class ViewpagerActivity extends AppCompatActivity {

private ViewPager mViewpager1;

private ViewPager mViewpager2;

private ZoomOutPageTransformer zoomOutPageTransformer;

@Override

protected void onCreate(@Nullable Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_viewpage1);

initView();

}

private void initView() {

mViewpager1 = findViewById(R.id.viewpager1);

mViewpager2 = findViewById(R.id.viewpager2);

mViewpager1.setAdapter(new TopViewPgaerAdapter(this));

mViewpager2.setAdapter(new BottomViewPagerAdapter(this));

mViewpager1.setOffscreenPageLimit(5);

mViewpager2.setOffscreenPageLimit(5);

BaseLinkPageChangeListener baseLinkPageChangeListener = new BaseLinkPageChangeListener(mViewpager1, mViewpager2);

mViewpager1.addOnPageChangeListener(baseLinkPageChangeListener);

BaseLinkPageChangeListener baseLinkPageChangeListener1 = new BaseLinkPageChangeListener(mViewpager2, mViewpager1);

mViewpager2.addOnPageChangeListener(baseLinkPageChangeListener1);

}

private static class TopViewPgaerAdapter extends PagerAdapter {

private Context context;

public TopViewPgaerAdapter(Context context) {

this.context = context;

}

@Override

public int getCount() {

return 5;

}

@Override

public boolean isViewFromObject(@NonNull View view, @NonNull Object object) {

// 判断是不是同一个视图

return view == object;

}

@NonNull

@Override

public Object instantiateItem(@NonNull ViewGroup container, int position) {

View inflate = LayoutInflater.from(context).inflate(R.layout.item_top, container, false);

container.addView(inflate);

return inflate;

}

}

private static class BottomViewPagerAdapter extends PagerAdapter {

private Context context;

public BottomViewPagerAdapter(Context context) {

this.context = context;

}

@Override

public int getCount() {

return 5;

}

@Override

public boolean isViewFromObject(@NonNull View view, @NonNull Object object) {

// 判断是不是同一个视图

return view == object;

}

@NonNull

@Override

public Object instantiateItem(@NonNull ViewGroup container, int position) {

View inflate = LayoutInflater.from(context).inflate(R.layout.item_bottom, container, false);

container.addView(inflate);

return inflate;

}

}

}

activity_viewpager.xml

xmlns:app="http://schemas.android.com/apk/res-auto"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

tools:context=".viewpageruse1.ViewpagerActivity">

android:id="@+id/viewpager1"

android:layout_width="match_parent"

android:layout_height="200dp"

app:layout_constraintLeft_toLeftOf="parent"

app:layout_constraintRight_toRightOf="parent"

app:layout_constraintTop_toTopOf="parent" />

android:id="@+id/viewpager2"

android:layout_width="match_parent"

android:layout_height="0dp"

android:layout_marginTop="30dp"

app:layout_constraintBottom_toBottomOf="parent"

app:layout_constraintTop_toBottomOf="@id/viewpager1" />

item_top.xml

xmlns:app="http://schemas.android.com/apk/res-auto"

android:layout_width="match_parent"

android:layout_height="wrap_content">

android:layout_width="200dp"

android:layout_height="200dp"

android:background="@color/teal_200"

app:layout_constraintEnd_toEndOf="parent"

app:layout_constraintStart_toStartOf="parent"

app:layout_constraintTop_toTopOf="parent" />

item_bottom.xml

xmlns:app="http://schemas.android.com/apk/res-auto"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:layout_marginTop="20dp">

android:layout_width="200dp"

android:layout_height="200dp"

android:background="@color/purple_500"

app:layout_constraintEnd_toEndOf="parent"

app:layout_constraintStart_toStartOf="parent"

app:layout_constraintTop_toTopOf="parent" />

分析

实现思路: 通过ViewPager的OnPageChangeListener监听回调的onPageScrolled(int position, float positionOffset, int positionOffsetPixels)方法来实现联动效果,关键代码如下:

selfViewPager.getWidth() + selfViewPager.getPageMargin() 偏移比例 (selfViewPager.getWidth() + selfViewPager.getPageMargin()) * position + positionOffsetPixels 表示当前手指触摸的ViewPager的总偏移距离 linkViewPager.getWidth() + linkViewPager.getPageMargin() 表示联动的ViewPager的大小

//计算移动值'

//

marginX = ((selfViewPager.getWidth() + selfViewPager.getPageMargin()) * position

+ positionOffsetPixels) * (linkViewPager.getWidth() + linkViewPager.getPageMargin()) /

(selfViewPager.getWidth() + selfViewPager.getPageMargin());

if (linkViewPager.getScrollX() != marginX) {

linkViewPager.scrollTo(marginX, 0);

}

测试 问题 问题产生原因分析 暂未找到原因 解决方案(先上代码)

activity_viewpager.xml

xmlns:app="http://schemas.android.com/apk/res-auto"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:splitMotionEvents="false"

tools:context=".viewpageruse1.Viewpager1Activity">

android:id="@+id/mLinear1"

android:layout_width="300dp"

android:layout_height="wrap_content"

android:background="@color/purple_500"

app:layout_constraintLeft_toLeftOf="parent"

app:layout_constraintRight_toRightOf="parent"

app:layout_constraintTop_toTopOf="parent">

android:id="@+id/viewpager1"

android:layout_width="match_parent"

android:layout_height="200dp" />

android:id="@+id/mLinear2"

android:layout_width="match_parent"

android:layout_height="0dp"

app:layout_constraintBottom_toBottomOf="parent"

app:layout_constraintTop_toBottomOf="@id/mLinear1">

android:id="@+id/viewpager2"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:layout_marginTop="30dp" />

MyLinearLayout.java

public class MyLinearLayout extends LinearLayout {

private MyLinearLayout otherLinearLayout;

public MyLinearLayout(Context context) {

super(context);

}

public MyLinearLayout(Context context, @Nullable AttributeSet attrs) {

super(context, attrs);

}

public MyLinearLayout(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {

super(context, attrs, defStyleAttr);

}

public MyLinearLayout(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {

super(context, attrs, defStyleAttr, defStyleRes);

}

public LinearLayout getOtherLinearLayout() {

return otherLinearLayout;

}

public void setOtherLinearLayout(MyLinearLayout otherLinearLayout) {

this.otherLinearLayout = otherLinearLayout;

}

@Override

public boolean dispatchTouchEvent(MotionEvent ev) {

if (otherLinearLayout != null) {

otherLinearLayout.fakeTouchEvent(ev);

}

return super.dispatchTouchEvent(ev);

}

public void fakeTouchEvent(MotionEvent ev) {

super.dispatchTouchEvent(ev);

}

@Override

public boolean onTouchEvent(MotionEvent event) {

return super.onTouchEvent(event);

}

@Override

public boolean onInterceptTouchEvent(MotionEvent ev) {

return super.onInterceptTouchEvent(ev);

}

}

Activity.java

public class ViewPagerActivity extends AppCompatActivity {

@Override

protected void onCreate(@Nullable Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_viewpage);

MyLinearLayout mLinear1 = findViewById(R.id.mLinear1);

MyLinearLayout mLinear2 = findViewById(R.id.mLinear2);

mLinear1.setOtherLinearLayout(mLinear2);

mLinear2.setOtherLinearLayout(mLinear1);

ViewPager mViewpager1 = findViewById(R.id.viewpager1);

ViewPager mViewpager2 = findViewById(R.id.viewpager2);

mViewpager1.setAdapter(new TopViewPgaerAdapter(this));

mViewpager2.setAdapter(new BottomViewPagerAdapter(this));

mViewpager1.setOffscreenPageLimit(5);

mViewpager2.setOffscreenPageLimit(5);

}

private static class TopViewPgaerAdapter extends PagerAdapter {

private Context context;

public TopViewPgaerAdapter(Context context) {

this.context = context;

}

@Override

public int getCount() {

return 5;

}

@Override

public boolean isViewFromObject(@NonNull View view, @NonNull Object object) {

// 判断是不是同一个视图

return view == object;

}

@NonNull

@Override

public Object instantiateItem(@NonNull ViewGroup container, int position) {

View inflate = LayoutInflater.from(context).inflate(R.layout.item_top, container, false);

container.addView(inflate);

return inflate;

}

}

private static class BottomViewPagerAdapter extends PagerAdapter {

private Context context;

public BottomViewPagerAdapter(Context context) {

this.context = context;

}

@Override

public int getCount() {

return 5;

}

@Override

public boolean isViewFromObject(@NonNull View view, @NonNull Object object) {

// 判断是不是同一个视图

return view == object;

}

@NonNull

@Override

public Object instantiateItem(@NonNull ViewGroup container, int position) {

View inflate = LayoutInflater.from(context).inflate(R.layout.item_parent, container, false);

container.addView(inflate);

return inflate;

}

}

}

问题: 使用上述代码虽然解决了联动问题，但是在多指滑动时会出现如下问题

解决方案:

禁用多指触控 android:splitMotionEvents="false"

关键代码:

public void setOtherLinearLayout(MyLinearLayout otherLinearLayout) {

this.otherLinearLayout = otherLinearLayout;

}

@Override

public boolean dispatchTouchEvent(MotionEvent ev) {

if (otherLinearLayout != null) {

otherLinearLayout.fakeTouchEvent(ev);

}

return super.dispatchTouchEvent(ev);

}

public void fakeTouchEvent(MotionEvent ev) {

super.dispatchTouchEvent(ev);

}

可能连你页没有想到，竟然能使用这么少的代码的量解决了联动的问题，而且滑动起来还很丝滑，viewpager2也是使用这种方式来解决的，而且Viewpager2运行起来更加的丝滑，毫无违和感，这一切还得归功于享学课堂的Colin老师，目前网上大部分的教程在viewpager上实现双联动都是使用滑动监听回调和继承viewpager的方式来解决问题。自从加入了享学课堂，才两个多月老板就给涨了两千薪水，之前同事做不出来的功能，我参考享学课堂老师讲的都解决了，哈哈，以后我就要跟着Colin老师学习下去。

废话不多说，viewpager2实现双联动直接上代码

activity_viewpager2.xml

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical">

android:id="@+id/linearLayout1"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:layout_gravity="center"

android:layout_weight="1"

android:layout_marginBottom="10dp">

android:id="@+id/viewPager"

android:layout_width="match_parent"

android:layout_height="match_parent" />

android:id="@+id/linearLayout2"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:layout_marginTop="10dp"

android:layout_weight="1">

android:id="@+id/viewPager2"

android:layout_width="match_parent"

android:layout_height="match_parent" />

fragment_test.xml

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

tools:context=".TestFragment">

android:layout_width="match_parent"

android:layout_height="match_parent"

android:layout_gravity="center"

android:gravity="center"

android:textSize="20dp"

android:text="@string/hello_blank_fragment" />

ViewPager2Activity.java

public class ViewPager2Activity extends AppCompatActivity {

private List fragments = new ArrayList<>();

private List fragments2 = new ArrayList<>();

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

ViewPager2 viewPager = findViewById(R.id.viewPager);

ViewPager2 viewPager2 = findViewById(R.id.viewPager2);

MyLinearLayout linearLayout1 = findViewById(R.id.linearLayout1);

MyLinearLayout linearLayout2 = findViewById(R.id.linearLayout2);

linearLayout1.setOtherLinearLayout(linearLayout2);

linearLayout2.setOtherLinearLayout(linearLayout1);

fragments.add( new OneFragment());

fragments.add( new TwoFragment());

fragments.add( new ThreeFragment());

fragments2.add( new OneFragment());

fragments2.add( new TwoFragment());

fragments2.add( new ThreeFragment());

viewPager.setAdapter(new ViewPagerAdapter(this,fragments));

viewPager2.setAdapter(new ViewPagerAdapter(this,fragments2));

}

}

ViewPagerAdapter.java

public class ViewPagerAdapter extends FragmentStateAdapter {

private final List fragments;

public ViewPagerAdapter(@NonNull FragmentActivity fragmentActivity, List fragments) {

super(fragmentActivity);

this.fragments = fragments;

}

@NonNull

@Override

public Fragment createFragment(int position) {

return fragments.get(position);

}

@Override

public int getItemCount() {

return fragments == null ? 0 : fragments.size();

}

}

OneFragment.java

public class TestFragment extends Fragment {

@Override

public View onCreateView(LayoutInflater inflater, ViewGroup container,

Bundle savedInstanceState) {

return inflater.inflate(R.layout.fragment_test, container, false);

}

}

TwoFragment.java

public class TwoFragment extends Fragment {

@Override

public View onCreateView(LayoutInflater inflater, ViewGroup container,

Bundle savedInstanceState) {

return inflater.inflate(R.layout.fragment_test, container, false);

}

}

ThreeFragment.java

public class ThreeFragment extends Fragment {

@Override

public View onCreateView(LayoutInflater inflater, ViewGroup container,

Bundle savedInstanceState) {

return inflater.inflate(R.layout.fragment_test, container, false);

}

}

效果:

看到没，要多丝滑，就有多丝滑，而且viewpager和viewpager2都是可以通用的，简简单单的代码就实现了，这一切都得感谢享学课堂的Colin老师，他们有着丰富的Android开发经验和前沿的开发技术，此刻都是独一无二的技术，好了，不多说了，我得找老师学习高级技术去了，学到了再分享给大家

相关文章

 您阅读本篇文章共花了：