com.flan.stock.view.TouTiaoPagerView.java Source code

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Here is the source code for com.flan.stock.view.TouTiaoPagerView.java

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/*
 *    Flan.Zeng 2011-2016   http://git.oschina.net/signup?inviter=flan
 *
 * 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.flan.stock.view;

import java.util.List;

import com.flan.stock.R;

import android.content.Context;
import android.content.res.TypedArray;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.Animation;
import android.view.animation.TranslateAnimation;
import android.widget.ImageView;
import android.widget.RelativeLayout;

/**
 * ?ViewPager
 * @author flan
 * @date   2015117
 */
public class TouTiaoPagerView extends RelativeLayout implements OnPageChangeListener {

    private int currentTab;
    private int tabImgWidth;
    private ImageView img_tab;
    private ViewPager viewPager;

    public TouTiaoPagerView(Context context, int LayoutId) {
        super(context);
        inflate(context, LayoutId, this);
        viewPager = (ViewPager) this.findViewById(R.id.vp_fragment);
        img_tab = (ImageView) this.findViewById(R.id.img_tab);
    }

    public TouTiaoPagerView(Context context, AttributeSet attrs) {
        super(context, attrs);

        TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.SimplePagerView);
        int layout = typedArray.getResourceId(R.styleable.SimplePagerView_pager_layout,
                R.layout.layout_news_toutio);
        typedArray.recycle();

        inflate(context, layout, this);
        viewPager = (ViewPager) this.findViewById(R.id.vp_fragment);
        img_tab = (ImageView) this.findViewById(R.id.img_tab);

    }

    public void setOnPageChangeListener(OnPageChangeListener listener) {
        viewPager.addOnPageChangeListener(listener);
    }

    /**
     * ?
     */
    public void setPagerList(List<View> viewlist) {
        viewPager.setAdapter(new SimplePagerAdapter(viewlist));

        //?? 
        DisplayMetrics dm = new DisplayMetrics();
        dm = getResources().getDisplayMetrics();
        int screenW = dm.widthPixels;
        if (viewlist != null && viewlist.size() > 0) {
            tabImgWidth = screenW / viewlist.size();
        } else {
            tabImgWidth = screenW;
        }

        LayoutParams para = (LayoutParams) img_tab.getLayoutParams();
        para.width = tabImgWidth;
        img_tab.setLayoutParams(para);
    }

    /**
     * ? ?
     * @param position
     */
    private void setCurrentTab(int position) {

        Animation animation = null;
        animation = new TranslateAnimation(tabImgWidth * currentTab, tabImgWidth * position, 0, 0);
        animation.setFillAfter(true);//True:???
        animation.setDuration(300); //?
        img_tab.startAnimation(animation);

        currentTab = position;
    }

    @Override
    public void onPageScrollStateChanged(int arg0) {
    }

    @Override
    public void onPageScrolled(int arg0, float arg1, int arg2) {
    }

    @Override
    public void onPageSelected(int position) {
        setCurrentTab(position);
    }

    /**
     * ?ViewPager?
     * @author flan
     * @date   2015117
     */
    class SimplePagerAdapter extends PagerAdapter {

        private List<View> viewList;

        public SimplePagerAdapter(List<View> viewList) {
            super();
            this.viewList = viewList;
        }

        @Override
        public int getCount() {

            if (viewList != null) {
                return viewList.size();
            }
            return 0;
        }

        @Override
        public boolean isViewFromObject(View arg0, Object arg1) {
            return arg0 == arg1;
        }

        @Override
        public void destroyItem(ViewGroup container, int position, Object object) {
            container.removeView(viewList.get(position));
        }

        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            container.addView(viewList.get(position));
            return viewList.get(position);
        }

    }

}