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开源组件:DEMO学习-DWinterTabDemo:自定义tab+viewpager

发布时间:2020-08-04 18:18:14 来源:网络 阅读:586 作者:glblong 栏目:开发技术

效果图:

开源组件:DEMO学习-DWinterTabDemo:自定义tab+viewpager

demo源码:

public class MainActivity extends Activity
{
    // ViewPager是google SDk中自带的一个附加包的一个类,可以用来实现屏幕间的切换。
    // android-support-v4.jar
    private ViewPager mPager;// 页卡内容
    private List<View> listViews; // Tab页面列表
    private ImageView cursor;// 动画图片
    private TextView t1, t2, t3;// 页卡头标
    private int offset = 0;// 动画图片偏移量
    private int currIndex = 0;// 当前页卡编号
    private int bmpW;// 动画图片宽度
            
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        InitImageView();
        InitTextView();
        InitViewPager();
    }
            
    /**
     * 初始化头标
     */
    private void InitTextView()
    {
        t1 = (TextView) findViewById(R.id.text1);
        t2 = (TextView) findViewById(R.id.text2);
        t3 = (TextView) findViewById(R.id.text3);
                
        t1.setOnClickListener(new MyOnClickListener(0));
        t2.setOnClickListener(new MyOnClickListener(1));
        t3.setOnClickListener(new MyOnClickListener(2));
    }
            
    /**
     * 初始化ViewPager
     */
    private void InitViewPager()
    {
        mPager = (ViewPager) findViewById(R.id.vPager);
        listViews = new ArrayList<View>();
        LayoutInflater mInflater = getLayoutInflater();
        listViews.add(mInflater.inflate(R.layout.lay1, null));
        listViews.add(mInflater.inflate(R.layout.lay2, null));
        listViews.add(mInflater.inflate(R.layout.lay3, null));
        mPager.setAdapter(new MyPagerAdapter(listViews));
        mPager.setCurrentItem(0);
        mPager.setOnPageChangeListener(new MyOnPageChangeListener());
    }
            
    /**
     * 初始化动画
     */
    private void InitImageView()
    {
        cursor = (ImageView) findViewById(R.id.cursor);
        bmpW = BitmapFactory.decodeResource(getResources(), R.drawable.a).getWidth();// 获取图片宽度
        DisplayMetrics dm = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(dm);
        int screenW = dm.widthPixels;// 获取分辨率宽度
        offset = (screenW / 3 - bmpW) / 2;// 计算偏移量
        Matrix matrix = new Matrix();
        matrix.postTranslate(offset, 0);
        cursor.setImageMatrix(matrix);// 设置动画初始位置
    }
            
    /**
     * ViewPager适配器
     */
    public class MyPagerAdapter extends PagerAdapter
    {
        public List<View> mListViews;
                
        public MyPagerAdapter(List<View> mListViews)
        {
            this.mListViews = mListViews;
        }
                
        @Override
        public void destroyItem(View arg0, int arg1, Object arg2)
        {
            ((ViewPager) arg0).removeView(mListViews.get(arg1));
        }
                
        @Override
        public void finishUpdate(View arg0)
        {
        }
                
        @Override
        public int getCount()
        {
            return mListViews.size();
        }
                
        @Override
        public Object instantiateItem(View arg0, int arg1)
        {
            ((ViewPager) arg0).addView(mListViews.get(arg1), 0);
            return mListViews.get(arg1);
        }
                
        @Override
        public boolean isViewFromObject(View arg0, Object arg1)
        {
            return arg0 == (arg1);
        }
                
        @Override
        public void restoreState(Parcelable arg0, ClassLoader arg1)
        {
        }
                
        @Override
        public Parcelable saveState()
        {
            return null;
        }
                
        @Override
        public void startUpdate(View arg0)
        {
        }
    }
            
    /**
     * 头标点击监听
     */
    public class MyOnClickListener implements View.OnClickListener
    {
        private int index = 0;
                
        public MyOnClickListener(int i)
        {
            index = i;
        }
                
        @Override
        public void onClick(View v)
        {
            mPager.setCurrentItem(index);
        }
    };
            
    /**
     * 页卡切换监听
     */
    public class MyOnPageChangeListener implements OnPageChangeListener
    {
                
        int one = offset * 2 + bmpW;// 页卡1 -> 页卡2 偏移量
        int two = one * 2;// 页卡1 -> 页卡3 偏移量
                
        @Override
        public void onPageSelected(int arg0)
        {
            Animation animation = null;
            switch (arg0)
            {
                case 0:
                    if (currIndex == 1)
                    {
                        animation = new TranslateAnimation(one, 0, 0, 0);
                    }
                    else if (currIndex == 2)
                    {
                        animation = new TranslateAnimation(two, 0, 0, 0);
                    }
                    break;
                case 1:
                    if (currIndex == 0)
                    {
                        animation = new TranslateAnimation(offset, one, 0, 0);
                    }
                    else if (currIndex == 2)
                    {
                        animation = new TranslateAnimation(two, one, 0, 0);
                    }
                    break;
                case 2:
                    if (currIndex == 0)
                    {
                        animation = new TranslateAnimation(offset, two, 0, 0);
                    }
                    else if (currIndex == 1)
                    {
                        animation = new TranslateAnimation(one, two, 0, 0);
                    }
                    break;
            }
            currIndex = arg0;
            animation.setFillAfter(true);// True:图片停在动画结束位置
            animation.setDuration(300);
            cursor.startAnimation(animation);
        }
                
        @Override
        public void onPageScrolled(int arg0, float arg1, int arg2)
        {
        }
                
        @Override
        public void onPageScrollStateChanged(int arg0)
        {
        }
    }
}




其他方法:

1.ViewPager使用

http://zhangfy068.iteye.com/blog/1819979


2.页卡实现详解:Android ViewPager使用详解

http://blog.csdn.net/wangjinyu501/article/details/8169924











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