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adeds/MainActivity.java

Created November 6, 2018 18:14
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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>
Raw
MainActivity.java
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;
}
}
}
Raw
VerticalViewPager.java
//https://stackoverflow.com/a/46826363
/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.deskclock;
import android.content.Context;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
public class VerticalViewPager extends ViewPager {
public VerticalViewPager(Context context) {
this(context, null);
}
public VerticalViewPager(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
/**
* @return {@code false} since a vertical view pager can never be scrolled horizontally
*/
@Override
public boolean canScrollHorizontally(int direction) {
return false;
}
/**
* @return {@code true} iff a normal view pager would support horizontal scrolling at this time
*/
@Override
public boolean canScrollVertically(int direction) {
return super.canScrollHorizontally(direction);
}
private void init() {
// Make page transit vertical
setPageTransformer(true, new VerticalPageTransformer());
// Get rid of the overscroll drawing that happens on the left and right (the ripple)
setOverScrollMode(View.OVER_SCROLL_NEVER);
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
final boolean toIntercept = super.onInterceptTouchEvent(flipXY(ev));
// Return MotionEvent to normal
flipXY(ev);
return toIntercept;
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
final boolean toHandle = super.onTouchEvent(flipXY(ev));
// Return MotionEvent to normal
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) {
// This page is way off-screen to the left.
view.setAlpha(0);
} else if (position <= 1) {
view.setAlpha(1);
// Counteract the default slide transition
view.setTranslationX(pageWidth * -position);
// set Y position to swipe in from top
float yPosition = position * pageHeight;
view.setTranslationY(yPosition);
} else {
// This page is way off-screen to the right.
view.setAlpha(0);
}
}
}
}
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