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/*
* 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;
}
}
}
}
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