安卓:垂直ViewPager
安卓:垂直ViewPager
提问于 2012-11-21 00:38:32
有没有办法让ViewPager不是水平滚动，而是垂直滚动？！
回答 14
Stack Overflow用户
发布于 2014-04-02 05:52:17
您可以使用ViewPager.PageTransformer来提供垂直ViewPager的错觉。要实现垂直滚动而不是水平拖动，您必须覆盖ViewPager的默认触摸事件，并在处理它们之前交换MotionEvent的坐标，例如：
/**
* Uses a combination of a PageTransformer and swapping X & Y coordinates
* of touch events to create the illusion of a vertically scrolling ViewPager.
*
* Requires API 11+
*
*/
public class VerticalViewPager extends ViewPager {
public VerticalViewPager(Context context) {
super(context);
init();
}
public VerticalViewPager(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
private void init() {
// The majority of the magic happens here
setPageTransformer(true, new VerticalPageTransformer());
// The easiest way to get rid of the overscroll drawing that happens on the left and right
setOverScrollMode(OVER_SCROLL_NEVER);
}
private class VerticalPageTransformer implements ViewPager.PageTransformer {
@Override
public void transformPage(View view, float position) {
if (position < -1) { // [-Infinity,-1)
// This page is way off-screen to the left.
view.setAlpha(0);
} else if (position <= 1) { // [-1,1]
view.setAlpha(1);
// Counteract the default slide transition
view.setTranslationX(view.getWidth() * -position);
//set Y position to swipe in from top
float yPosition = position * view.getHeight();
view.setTranslationY(yPosition);
} else { // (1,+Infinity]
// This page is way off-screen to the right.
view.setAlpha(0);
}
}
}
/**
* Swaps the X and Y coordinates of your touch event.
*/
private MotionEvent swapXY(MotionEvent ev) {
float width = getWidth();
float height = getHeight();
float newX = (ev.getY() / height) * width;
float newY = (ev.getX() / width) * height;
ev.setLocation(newX, newY);
return ev;
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev){
boolean intercepted = super.onInterceptTouchEvent(swapXY(ev));
swapXY(ev); // return touch coordinates to original reference frame for any child views
return intercepted;
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
return super.onTouchEvent(swapXY(ev));
}
}当然，您可以根据需要调整这些设置。最后看起来像这样：
Stack Overflow用户
发布于 2017-10-19 17:07:27
垂直ViewPager
这里的其他答案似乎都有一些问题。即使是推荐的开源项目也没有合并最近的拉请求和错误修复。然后我发现了一个来自谷歌的VerticalViewPager，他们使用了一些DeskClock应用程序。我更相信使用Google的实现，而不是这里流传的其他答案。(谷歌的版本类似于目前投票最多的答案，但更全面。)
完整示例
这个示例与我的Basic ViewPager Example几乎完全相同，只是为了使用VerticalViewPager类做了一些细微的更改。
XML
为主活动和每个页面(片段)添加xml布局。注意，我们使用的是VerticalViewPager而不是标准的ViewPager。我将在下面包含这段代码。
activity_main.xml
<?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"
tools:context="com.example.verticalviewpager.MainActivity">
<com.example.myapp.VerticalViewPager
android:id="@+id/viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</RelativeLayout>fragment_one.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<TextView
android:id="@+id/textview"
android:textSize="30sp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true" />
</RelativeLayout>代码
VerticalViewPager的代码不是我的。这只是Google源代码中的一个精简版本(没有注释)。请查看该版本的最新版本。那里的评论也有助于理解正在发生的事情。
import android.support.v4.view.ViewPager;
public class VerticalViewPager extends ViewPager {
public VerticalViewPager(Context context) {
this(context, null);
}
public VerticalViewPager(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
@Override
public boolean canScrollHorizontally(int direction) {
return false;
}
@Override
public boolean canScrollVertically(int direction) {
return super.canScrollHorizontally(direction);
}
private void init() {
setPageTransformer(true, new VerticalPageTransformer());
setOverScrollMode(View.OVER_SCROLL_NEVER);
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
final boolean toIntercept = super.onInterceptTouchEvent(flipXY(ev));
flipXY(ev);
return toIntercept;
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
final boolean toHandle = super.onTouchEvent(flipXY(ev));
flipXY(ev);
return toHandle;
}
private MotionEvent flipXY(MotionEvent ev) {
final float width = getWidth();
final float height = getHeight();
final float x = (ev.getY() / height) * width;
final float y = (ev.getX() / width) * height;
ev.setLocation(x, y);
return ev;
}
private static final class VerticalPageTransformer implements ViewPager.PageTransformer {
@Override
public void transformPage(View view, float position) {
final int pageWidth = view.getWidth();
final int pageHeight = view.getHeight();
if (position < -1) {
view.setAlpha(0);
} else if (position <= 1) {
view.setAlpha(1);
view.setTranslationX(pageWidth * -position);
float yPosition = position * pageHeight;
view.setTranslationY(yPosition);
} else {
view.setAlpha(0);
}
}
}
}MainActivity.java
我只是用ViewPager替换了VerticalViewPager。
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
public class MainActivity extends AppCompatActivity {
static final int NUMBER_OF_PAGES = 2;
MyAdapter mAdapter;
VerticalViewPager mPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mAdapter = new MyAdapter(getSupportFragmentManager());
mPager = findViewById(R.id.viewpager);
mPager.setAdapter(mAdapter);
}
public static class MyAdapter extends FragmentPagerAdapter {
public MyAdapter(FragmentManager fm) {
super(fm);
}
@Override
public int getCount() {
return NUMBER_OF_PAGES;
}
@Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return FragmentOne.newInstance(0, Color.WHITE);
case 1:
// return a different Fragment class here
// if you want want a completely different layout
return FragmentOne.newInstance(1, Color.CYAN);
default:
return null;
}
}
}
public static class FragmentOne extends Fragment {
private static final String MY_NUM_KEY = "num";
private static final String MY_COLOR_KEY = "color";
private int mNum;
private int mColor;
// You can modify the parameters to pass in whatever you want
static FragmentOne newInstance(int num, int color) {
FragmentOne f = new FragmentOne();
Bundle args = new Bundle();
args.putInt(MY_NUM_KEY, num);
args.putInt(MY_COLOR_KEY, color);
f.setArguments(args);
return f;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mNum = getArguments() != null ? getArguments().getInt(MY_NUM_KEY) : 0;
mColor = getArguments() != null ? getArguments().getInt(MY_COLOR_KEY) : Color.BLACK;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_one, container, false);
v.setBackgroundColor(mColor);
TextView textView = v.findViewById(R.id.textview);
textView.setText("Page " + mNum);
return v;
}
}
}完成
你应该能够运行应用程序，并在上面的动画中看到结果。
另请参阅
Stack Overflow用户
发布于 2013-09-06 20:21:15
我有一个适合我的解决方案，分为两个步骤。
PagerAdapter的
onInstantiateItem()，创建视图并将其旋转-90：
view.setRotation(-90f)
如果使用的是FragmentPagerAdapter，则：
90度objFragment.getView().setRotation(-90)
- Rotate
ViewPager视图：
objViewPager.setRotation(90)
至少对我的要求来说，它就像一个护身符。
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原文链接：
https://stackoverflow.com/questions/13477820
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