| /* |
| * Copyright (C) 2015 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.example.android.supportv4.view; |
| |
| import com.example.android.supportv4.R; |
| |
| import android.app.Activity; |
| import android.graphics.Color; |
| import android.os.Bundle; |
| import android.support.v4.view.PagerAdapter; |
| import android.support.v4.view.PagerTitleStrip; |
| import android.support.v4.view.ViewPager; |
| import android.util.Pair; |
| import android.view.View; |
| import android.view.ViewGroup; |
| |
| import java.util.ArrayList; |
| |
| public class ViewPagerActivity extends Activity { |
| private ViewPager mPager; |
| private PagerTitleStrip mTitles; |
| private ColorPagerAdapter mAdapter; |
| |
| @Override |
| protected void onCreate(Bundle savedInstanceState) { |
| super.onCreate(savedInstanceState); |
| |
| setContentView(R.layout.view_pager_layout); |
| |
| mAdapter = new ColorPagerAdapter(); |
| mAdapter.add("Red", Color.RED); |
| mAdapter.add("Green", Color.GREEN); |
| mAdapter.add("Blue", Color.BLUE); |
| |
| mPager = (ViewPager) findViewById(R.id.pager); |
| mPager.setAdapter(mAdapter); |
| |
| mTitles = (PagerTitleStrip) findViewById(R.id.titles); |
| } |
| |
| private static class ColorPagerAdapter extends PagerAdapter { |
| private ArrayList<Pair<String, Integer>> mEntries = new ArrayList<>(); |
| |
| public void add(String title, int color) { |
| mEntries.add(new Pair(title, color)); |
| } |
| |
| @Override |
| public int getCount() { |
| return mEntries.size(); |
| } |
| |
| @Override |
| public Object instantiateItem(ViewGroup container, int position) { |
| final View view = new View(container.getContext()); |
| view.setBackgroundColor(mEntries.get(position).second); |
| |
| // Unlike ListView adapters, the ViewPager adapter is responsible |
| // for adding the view to the container. |
| container.addView(view); |
| |
| return new ViewHolder(view, position); |
| } |
| |
| @Override |
| public void destroyItem(ViewGroup container, int position, Object object) { |
| // The adapter is also responsible for removing the view. |
| container.removeView(((ViewHolder) object).view); |
| } |
| |
| @Override |
| public int getItemPosition(Object object) { |
| return ((ViewHolder) object).position; |
| } |
| |
| @Override |
| public boolean isViewFromObject(View view, Object object) { |
| return ((ViewHolder) object).view == view; |
| } |
| |
| @Override |
| public CharSequence getPageTitle(int position) { |
| return mEntries.get(position).first; |
| } |
| |
| private static class ViewHolder { |
| final View view; |
| final int position; |
| |
| public ViewHolder(View view, int position) { |
| this.view = view; |
| this.position = position; |
| } |
| } |
| } |
| } |