问题
I\'m designing a view with multiple pages. I want edges of previous and next pages to be show like below and implement a 2 finger swipe to switch between pages.
![\"enter](\"https://i.stack.imgur.com/ddm1j.jpg\")
I tried using ViewPager with negative page margin as suggested here but that only shows one of the edges on the screen, not both simultaneously.
Alternatively, is there any way i can position part of my view outside screen and then animate it giving it a ViewPager type effect.
How should I go about it ? Thanks !
回答1:
Quoting myself from a blog post on this subject:
The third approach comes from Dave Smith, co-author of the well-regarded book Android Recipes. He went in a very different direction, using a custom container that disabled children clipping to show more than one page at a time.
His published sample code shows the whole thing in action. His container (
com.example.pagercontainer.PagerContainer) wraps theViewPagerand callssetClipChildren(false);on itself, so even though theViewPageris focused on one selected page, other pages that have coordinates beyond theViewPagerbounds are still visible, so long as they fit within thePagerContainer. By sizing theViewPagerto be smaller than thePagerContainer, theViewPagercan size its pages to that size, leaving room for other pages to be seen.PagerContainer, though, needs to help out a bit with touch events, asViewPagerwill only handle swipe events on its own visible bounds, ignoring any pages visible to the sides.
回答2:
I have a similar solution:
On the viewpager set left and right padding, e.g. 20dp. Do also set the page margin on the viewpager, e.g. half of the pager padding. And do not forget to disable clip padding.
tilePager.setPadding(defaultGap, 0, defaultGap, 0);
tilePager.setClipToPadding(false);
tilePager.setPageMargin(halfGap);
回答3:
Set left and right padding for whole item view. Example xml (page_item.xml):
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:paddingLeft="20dp" android:paddingRight="20dp"/> <TextView android:id="@+id/text1" android:text="Large Text" android:textAppearance="?android:attr/textAppearanceLarge" /> </LinearLayout>Then set negative page margin for
PageViewequal to 2*(previous view padding)int margin = (int)TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 20*2, getResources().getDisplayMetrics()); mViewPager.setPageMargin(-margin);Optional. Set zero left padding for first item and zero right padding to last item to hide empty edges. You may do this in the
PageAdapterorPagefragment class.
回答4:
To show preview of left and right pages set the following two values
viewpager.setClipToPadding(false)
viewpager.setPadding(left,0,right,0)
If you need space between two pages in the viewpager then add viewpager.setPageMargin(int)
Android ViewPager - Show preview of page on left and right
回答5:
if someone still looking for solution, I had customized the ViewPage to achieve it without using negative margin, find a sample project here https://github.com/44kksharma/Android-ViewPager-Carousel-UI
it should work in most cases but you can still define page margin with
mPager.setPageMargin(margin in pixel);
回答6:
Download the source code from here(ViewPager with previous and next page boundaries)
MainActivity.java
package com.deepshikha.viewpager;
import android.content.Context;
import android.content.res.Configuration;
import android.os.Build;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.app.FragmentStatePagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.util.Log;
import android.util.SparseArray;
import android.view.ViewGroup;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends FragmentActivity {
ViewPager pager;
MyPageAdapter obj_adapter;
String str_device;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
init();
}
private void init() {
pager = (ViewPager) findViewById(R.id.viewpager);
differentDensityAndScreenSize(getApplicationContext());
List<Fragment> fragments = getFragments();
pager.setAdapter(obj_adapter);
pager.setClipToPadding(false);
if (str_device.equals("normal-hdpi")){
pager.setPadding(160, 0, 160, 0);
}else if (str_device.equals("normal-mdpi")){
pager.setPadding(160, 0, 160, 0);
}else if (str_device.equals("normal-xhdpi")){
pager.setPadding(160, 0, 160, 0);
}else if (str_device.equals("normal-xxhdpi")){
pager.setPadding(180, 0, 180, 0);
}else if (str_device.equals("normal-xxxhdpi")){
pager.setPadding(180, 0, 180, 0);
}else if (str_device.equals("normal-unknown")){
pager.setPadding(160, 0, 160, 0);
}else {
}
obj_adapter = new MyPageAdapter(getSupportFragmentManager(), fragments);
pager.setPageTransformer(true, new ExpandingViewPagerTransformer());
pager.setAdapter(obj_adapter);
}
class MyPageAdapter extends FragmentPagerAdapter {
private List<Fragment> fragments;
public MyPageAdapter(FragmentManager fm, List<Fragment> fragments) {
super(fm);
this.fragments = fragments;
}
@Override
public Fragment getItem(int position) {
return this.fragments.get(position);
}
@Override
public int getCount() {
return this.fragments.size();
}
}
private List<Fragment> getFragments() {
List<Fragment> fList = new ArrayList<Fragment>();
fList.add(MyFragment.newInstance("Fragment 1",R.drawable.imags));
fList.add(MyFragment.newInstance("Fragment 2",R.drawable.image1));
fList.add(MyFragment.newInstance("Fragment 3",R.drawable.image2));
fList.add(MyFragment.newInstance("Fragment 4",R.drawable.image3));
fList.add(MyFragment.newInstance("Fragment 5",R.drawable.image4));
return fList;
}
public int differentDensityAndScreenSize(Context context) {
int value = 20;
String str = "";
if ((context.getResources().getConfiguration().screenLayout & Configuration.SCREENLAYOUT_SIZE_MASK) == Configuration.SCREENLAYOUT_SIZE_SMALL) {
switch (context.getResources().getDisplayMetrics().densityDpi) {
case DisplayMetrics.DENSITY_LOW:
str = "small-ldpi";
// Log.e("small 1","small-ldpi");
value = 20;
break;
case DisplayMetrics.DENSITY_MEDIUM:
str = "small-mdpi";
// Log.e("small 1","small-mdpi");
value = 20;
break;
case DisplayMetrics.DENSITY_HIGH:
str = "small-hdpi";
// Log.e("small 1","small-hdpi");
value = 20;
break;
case DisplayMetrics.DENSITY_XHIGH:
str = "small-xhdpi";
// Log.e("small 1","small-xhdpi");
value = 20;
break;
case DisplayMetrics.DENSITY_XXHIGH:
str = "small-xxhdpi";
// Log.e("small 1","small-xxhdpi");
value = 20;
break;
case DisplayMetrics.DENSITY_XXXHIGH:
str = "small-xxxhdpi";
//Log.e("small 1","small-xxxhdpi");
value = 20;
break;
case DisplayMetrics.DENSITY_TV:
str = "small-tvdpi";
// Log.e("small 1","small-tvdpi");
value = 20;
break;
default:
str = "small-unknown";
value = 20;
break;
}
} else if ((context.getResources().getConfiguration().screenLayout & Configuration.SCREENLAYOUT_SIZE_MASK) == Configuration.SCREENLAYOUT_SIZE_NORMAL) {
switch (context.getResources().getDisplayMetrics().densityDpi) {
case DisplayMetrics.DENSITY_LOW:
str = "normal-ldpi";
// Log.e("normal-ldpi 1","normal-ldpi");
str_device = "normal-ldpi";
value = 82;
break;
case DisplayMetrics.DENSITY_MEDIUM:
// Log.e("normal-mdpi 1","normal-mdpi");
str = "normal-mdpi";
value = 82;
str_device = "normal-mdpi";
break;
case DisplayMetrics.DENSITY_HIGH:
// Log.e("normal-hdpi 1","normal-hdpi");
str = "normal-hdpi";
str_device = "normal-hdpi";
value = 82;
break;
case DisplayMetrics.DENSITY_XHIGH:
//Log.e("normal-xhdpi 1","normal-xhdpi");
str = "normal-xhdpi";
str_device = "normal-xhdpi";
value = 90;
break;
case DisplayMetrics.DENSITY_XXHIGH:
// Log.e("normal-xxhdpi 1","normal-xxhdpi");
str = "normal-xxhdpi";
str_device = "normal-xxhdpi";
value = 96;
break;
case DisplayMetrics.DENSITY_XXXHIGH:
//Log.e("normal-xxxhdpi","normal-xxxhdpi");
str = "normal-xxxhdpi";
str_device = "normal-xxxhdpi";
value = 96;
break;
case DisplayMetrics.DENSITY_TV:
//Log.e("DENSITY_TV 1","normal-mdpi");
str = "normal-tvdpi";
str_device = "normal-tvmdpi";
value = 96;
break;
default:
// Log.e("normal-unknown","normal-unknown");
str = "normal-unknown";
str_device = "normal-unknown";
value = 82;
break;
}
} else if ((context.getResources().getConfiguration().screenLayout & Configuration.SCREENLAYOUT_SIZE_MASK) == Configuration.SCREENLAYOUT_SIZE_LARGE) {
switch (context.getResources().getDisplayMetrics().densityDpi) {
case DisplayMetrics.DENSITY_LOW:
str = "large-ldpi";
// Log.e("large-ldpi 1","normal-ldpi");
value = 78;
break;
case DisplayMetrics.DENSITY_MEDIUM:
str = "large-mdpi";
//Log.e("large-ldpi 1","normal-mdpi");
value = 78;
break;
case DisplayMetrics.DENSITY_HIGH:
//Log.e("large-ldpi 1","normal-hdpi");
str = "large-hdpi";
value = 78;
break;
case DisplayMetrics.DENSITY_XHIGH:
// Log.e("large-ldpi 1","normal-xhdpi");
str = "large-xhdpi";
value = 125;
break;
case DisplayMetrics.DENSITY_XXHIGH:
//Log.e("large-ldpi 1","normal-xxhdpi");
str = "large-xxhdpi";
value = 125;
break;
case DisplayMetrics.DENSITY_XXXHIGH:
// Log.e("large-ldpi 1","normal-xxxhdpi");
str = "large-xxxhdpi";
value = 125;
break;
case DisplayMetrics.DENSITY_TV:
//Log.e("large-ldpi 1","normal-tvdpi");
str = "large-tvdpi";
value = 125;
break;
default:
str = "large-unknown";
value = 78;
break;
}
} else if ((context.getResources().getConfiguration().screenLayout & Configuration.SCREENLAYOUT_SIZE_MASK) == Configuration.SCREENLAYOUT_SIZE_XLARGE) {
switch (context.getResources().getDisplayMetrics().densityDpi) {
case DisplayMetrics.DENSITY_LOW:
// Log.e("large-ldpi 1","normal-ldpi");
str = "xlarge-ldpi";
value = 125;
break;
case DisplayMetrics.DENSITY_MEDIUM:
// Log.e("large-ldpi 1","normal-mdpi");
str = "xlarge-mdpi";
value = 125;
break;
case DisplayMetrics.DENSITY_HIGH:
//Log.e("large-ldpi 1","normal-hdpi");
str = "xlarge-hdpi";
value = 125;
break;
case DisplayMetrics.DENSITY_XHIGH:
// Log.e("large-ldpi 1","normal-hdpi");
str = "xlarge-xhdpi";
value = 125;
break;
case DisplayMetrics.DENSITY_XXHIGH:
// Log.e("large-ldpi 1","normal-xxhdpi");
str = "xlarge-xxhdpi";
value = 125;
break;
case DisplayMetrics.DENSITY_XXXHIGH:
// Log.e("large-ldpi 1","normal-xxxhdpi");
str = "xlarge-xxxhdpi";
value = 125;
break;
case DisplayMetrics.DENSITY_TV:
//Log.e("large-ldpi 1","normal-tvdpi");
str = "xlarge-tvdpi";
value = 125;
break;
default:
str = "xlarge-unknown";
value = 125;
break;
}
}
return value;
}
}
回答7:
Sometime ago I needed such feature and prepared a tiny library which uses RecyclerView with PagerSnapHelper (added in version 25.1.0 of the v7 support library) instead of classic ViewPager:
MetalRecyclerPagerView - you can find all the code along with examples there.
Mainly it consists of a single class file: MetalRecyclerViewPager.java (and two xmls: attrs.xml and ids.xml).
Hope it helps somebody :)
来源：https://stackoverflow.com/questions/13914609/viewpager-with-previous-and-next-page-boundaries