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SlidingTabsBasic / src / com.example.android.slidingtabsbasic /

SlidingTabsBasicFragment.java

       
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        /*
       
       
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        * Copyright (C) 2013 The Android Open Source Project
       
       
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        *
       
       
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        * Licensed under the Apache License, Version 2.0 (the "License");
       
       
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        * you may not use this file except in compliance with the License.
       
       
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        * You may obtain a copy of the License at
       
       
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        *
       
       
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        *      http://www.apache.org/licenses/LICENSE-2.0
       
       
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        *
       
       
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        * Unless required by applicable law or agreed to in writing, software
       
       
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        * distributed under the License is distributed on an "AS IS" BASIS,
       
       
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        * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
       
       
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        * See the License for the specific language governing permissions and
       
       
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        * limitations under the License.
       
       
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        */
       
       
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        package com.example.android.slidingtabsbasic;
       
       
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        import com.example.android.common.logger.Log;
       
       
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        import com.example.android.common.view.SlidingTabLayout;
       
       
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        import android.os.Bundle;
       
       
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        import android.support.v4.app.Fragment;
       
       
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        import android.support.v4.view.PagerAdapter;
       
       
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        import android.support.v4.view.ViewPager;
       
       
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        import android.view.LayoutInflater;
       
       
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        import android.view.View;
       
       
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        import android.view.ViewGroup;
       
       
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        import android.widget.TextView;
       
       
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        /**
       
       
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        * A basic sample which shows how to use {@link com.example.android.common.view.SlidingTabLayout}
       
       
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        * to display a custom {@link ViewPager} title strip which gives continuous feedback to the user
       
       
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        * when scrolling.
       
       
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        */
       
       
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        public class SlidingTabsBasicFragment extends Fragment {
       
       
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        static final String LOG_TAG = "SlidingTabsBasicFragment";
       
       
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        /**
       
       
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        * A custom {@link ViewPager} title strip which looks much like Tabs present in Android v4.0 and
       
       
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        * above, but is designed to give continuous feedback to the user when scrolling.
       
       
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        */
       
       
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        private SlidingTabLayout mSlidingTabLayout;
       
       
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        /**
       
       
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        * A {@link ViewPager} which will be used in conjunction with the {@link SlidingTabLayout} above.
       
       
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        */
       
       
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        private ViewPager mViewPager;
       
       
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        /**
       
       
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        * Inflates the {@link View} which will be displayed by this {@link Fragment}, from the app's
       
       
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        * resources.
       
       
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        */
       
       
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        @Override
       
       
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        public View onCreateView(LayoutInflater inflater, ViewGroup container,
       
       
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        Bundle savedInstanceState) {
       
       
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        return inflater.inflate(R.layout.fragment_sample, container, false);
       
       
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        }
       
       
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        /**
       
       
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        * This is called after the {@link #onCreateView(LayoutInflater, ViewGroup, Bundle)} has finished.
       
       
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        * Here we can pick out the {@link View}s we need to configure from the content view.
       
       
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        *
       
       
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        * We set the {@link ViewPager}'s adapter to be an instance of {@link SamplePagerAdapter}. The
       
       
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        * {@link SlidingTabLayout} is then given the {@link ViewPager} so that it can populate itself.
       
       
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        *
       
       
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        * @param view View created in {@link #onCreateView(LayoutInflater, ViewGroup, Bundle)}
       
       
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        */
       
       
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        @Override
       
       
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        public void onViewCreated(View view, Bundle savedInstanceState) {
       
       
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        // Get the ViewPager and set it's PagerAdapter so that it can display items
       
       
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        mViewPager = (ViewPager) view.findViewById(R.id.viewpager);
       
       
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        mViewPager.setAdapter(new SamplePagerAdapter());
       
       
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        // Give the SlidingTabLayout the ViewPager, this must be done AFTER the ViewPager has had
       
       
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        // it's PagerAdapter set.
       
       
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        mSlidingTabLayout = (SlidingTabLayout) view.findViewById(R.id.sliding_tabs);
       
       
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        mSlidingTabLayout.setViewPager(mViewPager);
       
       
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        }
       
       
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        /**
       
       
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        * The {@link android.support.v4.view.PagerAdapter} used to display pages in this sample.
       
       
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        * The individual pages are simple and just display two lines of text. The important section of
       
       
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        * this class is the {@link #getPageTitle(int)} method which controls what is displayed in the
       
       
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        * {@link SlidingTabLayout}.
       
       
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        */
       
       
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        class SamplePagerAdapter extends PagerAdapter {
       
       
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        /**
       
       
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        * @return the number of pages to display
       
       
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        */
       
       
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        @Override
       
       
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        public int getCount() {
       
       
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        return 10;
       
       
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        }
       
       
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        /**
       
       
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        * @return true if the value returned from {@link #instantiateItem(ViewGroup, int)} is the
       
       
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        * same object as the {@link View} added to the {@link ViewPager}.
       
       
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        */
       
       
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        @Override
       
       
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        public boolean isViewFromObject(View view, Object o) {
       
       
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        return o == view;
       
       
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        }
       
       
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        /**
       
       
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        * Return the title of the item at {@code position}. This is important as what this method
       
       
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        * returns is what is displayed in the {@link SlidingTabLayout}.
       
       
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        * <p>
       
       
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        * Here we construct one using the position value, but for real application the title should
       
       
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        * refer to the item's contents.
       
       
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        */
       
       
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        @Override
       
       
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        public CharSequence getPageTitle(int position) {
       
       
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        return "Item " + (position + 1);
       
       
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        }
       
       
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        /**
       
       
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        * Instantiate the {@link View} which should be displayed at {@code position}. Here we
       
       
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        * inflate a layout from the apps resources and then change the text view to signify the position.
       
       
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        */
       
       
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        @Override
       
       
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        public Object instantiateItem(ViewGroup container, int position) {
       
       
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        // Inflate a new layout from our resources
       
       
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        View view = getActivity().getLayoutInflater().inflate(R.layout.pager_item,
       
       
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        container, false);
       
       
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        // Add the newly created View to the ViewPager
       
       
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        container.addView(view);
       
       
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        // Retrieve a TextView from the inflated View, and update it's text
       
       
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        TextView title = (TextView) view.findViewById(R.id.item_title);
       
       
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        title.setText(String.valueOf(position + 1));
       
       
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        Log.i(LOG_TAG, "instantiateItem() [position: " + position + "]");
       
       
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        // Return the View
       
       
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        return view;
       
       
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        }
       
       
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        /**
       
       
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        * Destroy the item from the {@link ViewPager}. In our case this is simply removing the
       
       
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        * {@link View}.
       
       
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        */
       
       
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        @Override
       
       
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        public void destroyItem(ViewGroup container, int position, Object object) {
       
       
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        container.removeView((View) object);
       
       
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        Log.i(LOG_TAG, "destroyItem() [position: " + position + "]");
       
       
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        }
       
       
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        }
       
       
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        }