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PagerTabStrip及自定义的PagerTab

发布时间:2016-06-16 12:00:05
如图是效果图 开发中经常会用到上面是一个Tab下面是一个ViewPager(ViewPager再包含几个Fragment),当点击Tab或是滑动ViewPager,Tab及ViewPager都会发生对应的变化如图我实现的上面一个Tab是自己定义的布局让其继 ...

PagerTabStrip及自定义的PagerTab

如图是效果图

PagerTabStrip及自定义的PagerTab     PagerTabStrip及自定义的PagerTab

开发中经常会用到上面是一个Tab下面是一个ViewPager(ViewPager再包含几个Fragment),当点击Tab或是滑动ViewPager,Tab及ViewPager都会发生对应的变化

如图我实现的上面一个Tab是自己定义的布局让其继承HorizontalScrollView,下面一个使用系统PagerTabStrip很简单,

当然引用别人的框架Android-ViewPagerIndicator(https://github.com/JakeWharton/ViewPagerIndicator)实现更简单

如下是主要代码

package com.it.hello.activity.assets;import java.util.ArrayList;import com.it.hello.R;import com.it.hello.activity.entity.ChannelItem;import com.it.hello.activity.fragment.FourFragment;import com.it.hello.activity.fragment.MThreeFragment;import com.it.hello.activity.fragment.OneFragment;import com.it.hello.activity.myfragment.MyFragmentOne;import com.it.hello.activity.myfragment.MyFragmentTwo;import com.it.hello.activity.util.DensityUtils;import com.it.hello.activity.widget.ColumnHorizontalScrollView;import android.os.Bundle;import android.support.v4.app.Fragment;import android.support.v4.app.FragmentActivity;import android.support.v4.app.FragmentManager;import android.support.v4.app.FragmentStatePagerAdapter;import android.support.v4.view.PagerTabStrip;import android.support.v4.view.ViewPager;import android.util.SparseArray;import android.view.View;import android.widget.LinearLayout;import android.widget.RelativeLayout;import android.widget.TextView;import android.widget.RelativeLayout.LayoutParams;/** * PagerTabStrip实现ViewPager的滑动 * @author zh * */public class MyStripActivity extends FragmentActivity {  private ViewPager mViewPager;  private PagerTabStrip pager_tab_strip;  /** 自定义的HorizontalScrollView */  private ColumnHorizontalScrollView mColumnHorizontalScrollView;  private LinearLayout mRadioGroup_content;  /** 用户选择的分类列表 */  private ArrayList<ChannelItem> userChannelItems = new ArrayList<ChannelItem>();  /** 当前选中的栏目 */  private int columnSelectIndex = 0;  /** 屏幕的宽度 */  private int mScreeWidth = 0;  /** Item宽度 */  private int mItemWidth = 0;  private View view;  @Override  protected void onCreate(Bundle arg0) {    // TODO Auto-generated method stub    super.onCreate(arg0);    setContentView(R.layout.activity_strip);    mScreeWidth = DensityUtils.getWindowsWidth(this);    mItemWidth = mScreeWidth / 3; // 一个Item宽度为屏幕的3分之一    mViewPager = (ViewPager) findViewById(R.id.vp);    pager_tab_strip = (PagerTabStrip) findViewById(R.id.pager_tab_strip);    // 设置标签下划线的颜色    mColumnHorizontalScrollView = (ColumnHorizontalScrollView) findViewById(R.id.mColumnHorizontal);    mRadioGroup_content = (LinearLayout) findViewById(R.id.mRadioGroup);        initColumData();    //取消Tab 下面的长横线    pager_tab_strip.setDrawFullUnderline(false);    //改变Tab线的颜色    pager_tab_strip.setTabIndicatorColor(getResources().getColor(        R.color.indecolor));    mViewPager.setOffscreenPageLimit(3);    mViewPager.setAdapter(new MainAdapter(getSupportFragmentManager()));  }  private void initColumData() {    // TODO Auto-generated method stub    userChannelItems = new ArrayList<ChannelItem>();    ChannelItem item = new ChannelItem(0, "标签0", 0, 0);    ChannelItem item1 = new ChannelItem(0, "标签1", 0, 0);    ChannelItem item2 = new ChannelItem(0, "标签2", 0, 0);    ChannelItem item3 = new ChannelItem(0, "标签3", 0, 0);    ChannelItem item4 = new ChannelItem(0, "标签4", 0, 0);    userChannelItems.add(item);    userChannelItems.add(item1);    userChannelItems.add(item2);    userChannelItems.add(item3);    userChannelItems.add(item4);    initTabColumn();    /**     * ViewPager切换监听的方法     */    mViewPager        .setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {          @Override          public void onPageSelected(int position) {            // TODO Auto-generated method stub            mViewPager.setCurrentItem(position);            selectTab(position);            initColumData();          }        });  }  /**   * 初始化TabColumn栏目项   */  private void initTabColumn() {    // TODO Auto-generated method stub    mRadioGroup_content.removeAllViews();    int count = userChannelItems.size();    mColumnHorizontalScrollView.setParam(this, mScreeWidth,        mRadioGroup_content);    for (int i = 0; i < count; i++) {      RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(          mItemWidth, LayoutParams.WRAP_CONTENT);      params.leftMargin = 5;      params.rightMargin = 5;      view = View.inflate(this, R.layout.item_mytab, null);      TextView tv = (TextView) view.findViewById(R.id.tab_title);      View line = (View) view.findViewById(R.id.tab_line);      tv.setId(i);      tv.setText(userChannelItems.get(i).getName());      if (columnSelectIndex == i) {        tv.setSelected(true);        line.setSelected(true);      }      view.setOnClickListener(new View.OnClickListener() {        @Override        public void onClick(View arg0) {          // TODO Auto-generated method stub          for (int i = 0; i < mRadioGroup_content.getChildCount(); i++) {            View localView = mRadioGroup_content.getChildAt(i);            if (localView != arg0) {              localView.setSelected(false);            } else {              localView.setSelected(true);              mViewPager.setCurrentItem(i);            }          }        }      });      mRadioGroup_content.addView(view, i, params);    }  }  /**   * 选择的Column里面的Tab   * */  private void selectTab(int tab_postion) {    columnSelectIndex = tab_postion;    for (int i = 0; i < mRadioGroup_content.getChildCount(); i++) {      View checkView = mRadioGroup_content.getChildAt(tab_postion);      int k = checkView.getMeasuredWidth();      int l = checkView.getLeft();      int i2 = l + k / 2 - mScreeWidth / 2;      mColumnHorizontalScrollView.smoothScrollTo(i2, 0);    }    // 判断是否选中    for (int j = 0; j < mRadioGroup_content.getChildCount(); j++) {      View checkView = mRadioGroup_content.getChildAt(j);      boolean ischeck;      if (j == tab_postion) {        ischeck = true;      } else {        ischeck = false;      }      checkView.setSelected(ischeck);    }  }    /**   * ViewPager的适配器   * @author zh   *   */  private class MainAdapter extends FragmentStatePagerAdapter {    public MainAdapter(FragmentManager fm) {      super(fm);      // TODO Auto-generated constructor stub    }    // 每个条目返回的Fragment    @Override    public Fragment getItem(int position) {      // TODO Auto-generated method stub      return createFragment(position);    }    // 一共多少个条目    @Override    public int getCount() {      // TODO Auto-generated method stub      return 5;    }    // 返回每个条目的标题    @Override    public CharSequence getPageTitle(int position) {      return "标签" + position;    }  }  //private static Map<Integer, Fragment> mFragmentMap = new HashMap<Integer, Fragment>();  private static SparseArray<Fragment> mFragmentMap = new SparseArray<Fragment>();  public Fragment createFragment(int position) {    // TODO Auto-generated method stub    Fragment fragment = null;    fragment = mFragmentMap.get(position);//在集合中去除Fragment    if(fragment == null){//如果没在集合中取出来 需要重新创建            if (position == 0) {        fragment = new MyFragmentOne();      } else if (position == 1) {        fragment = new MyFragmentTwo();      } else if (position == 3) {        fragment = new MThreeFragment();      } else if (position == 4) {        fragment = new FourFragment();      } else {        fragment = new OneFragment();      }      if(fragment != null){        mFragmentMap.put(position, fragment);//把创建好的Fragment存放到集合中缓存起来      }    }    return fragment;  }}

原标题:PagerTabStrip及自定义的PagerTab

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