Android自定义横向滑动菜单的实现

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tabs="http://schemas.android.com/apk/res-auto"
 android:id="@+id/homeTabs"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent"
 android:background="@color/db_bg_gray"
 android:orientation="vertical">
 <com.wankr.app.widget.ColumnHorizontalScrollView
     android:id="@+id/mColumnHorizontalScrollView"
  android:layout_height="match_parent"
  android:layout_width="wrap_content"
  android:layout_centerVertical="true"
  android:scrollbars="none">
  <LinearLayout
   android:id="@+id/mRadioGroup_content"
   android:layout_width="fill_parent"
   android:layout_height="match_parent"
   android:layout_centerVertical="true"
   android:gravity="center_vertical"
   android:orientation="horizontal"
   android:paddingLeft="10.0dip"
   android:paddingRight="10.0dip" />
 </com.wankr.app.widget.ColumnHorizontalScrollView>
 <android.support.v4.view.ViewPager
   android:id="@+id/contentPager"
   android:layout_width="match_parent"
   android:layout_height="0dp"
   android:layout_weight="1" />
</LinearLayout>

package com.example.app;
import java.util.ArrayList;
import java.util.List;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.LayoutParams;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.TextView;
public class MainActivity extends Fragment implements OnClickListener {
 private ViewPager contentPager;
 private ContentPagerAdapter pagerAdapter;
 private ColumnHorizontalScrollView mColumnHorizontalScrollView;
 private LinearLayout mRadioGroup_content;
 /** 请求CODE */
 public final static int CHANNELREQUEST = 1;
 /** 屏幕宽度 */
 private int mScreenWidth = 0;
 /** Item宽度 */
 private int mItemWidth = 0;
 /** 当前选中的栏目*/
 private int columnSelectIndex = 0;
 // 标签信息
 private List<ChannelItem> channelItems = new ArrayList<ChannelItem>();
 @Override
 public View onCreateView(LayoutInflater inflater, ViewGroup container,
   Bundle savedInstanceState) {
  View v = inflater.inflate(R.layout.activity_main, container , false);
  this.contentPager = (ViewPager) v.findViewById(R.id.contentPager);
  this.pagerAdapter = new ContentPagerAdapter(getChildFragmentManager());
  this.contentPager.setAdapter(this.pagerAdapter);
  this.contentPager.setCurrentItem(0);
  this.contentPager.setOnPageChangeListener(pageListener);
  this.mColumnHorizontalScrollView = (ColumnHorizontalScrollView) v.findViewById(R.id.mColumnHorizontalScrollView);
  this.mRadioGroup_content = (LinearLayout) v.findViewById(R.id.mRadioGroup_content);
  this.setChangeView();
  return v;
 }
 /**
  * 设置标题适配器
  * @author raotaisen
  *
  */
 private class ContentPagerAdapter extends FragmentPagerAdapter {
  public ContentPagerAdapter(FragmentManager fm) {
   super(fm);
   // TODO Auto-generated constructor stub
  }
  @Override
  public Fragment getItem(int arg0) {
   // TODO Auto-generated method stub
   return null;
  }
  @Override
  public int getCount() {
   // TODO Auto-generated method stub
   return channelItems.size();
  }
  /**
   * 标题设置
   */
  @Override
  public CharSequence getPageTitle(int position) {
   ChannelItem item = channelItems.get(position);
   return item.getChanneName();
  }
 }
 /**
  * ViewPager切换监听方法
  * */
 public ViewPager.OnPageChangeListener pageListener= new ViewPager.OnPageChangeListener(){
  @Override
  public void onPageScrollStateChanged(int arg0) {
  }
  @Override
  public void onPageScrolled(int arg0, float arg1, int arg2) {
  }
  @Override
  public void onPageSelected(int position) {
   contentPager.setCurrentItem(position);
   selectTab(position);
  }
 };
 /**
  * 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 - mScreenWidth / 2;
   // rg_nav_content.getParent()).smoothScrollTo(i2, 0);
   mColumnHorizontalScrollView.smoothScrollTo(i2, 0);
   // mColumnHorizontalScrollView.smoothScrollTo((position - 2) *
   // mItemWidth , 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);
  }
  // 指向对应的tab位置
  switch (tab_postion) {
  }
 }
 /**
  * 当栏目项发生变化时候调用
  */
 private void setChangeView() {
  gettColumnData();
  initTabColumn();
 }
 /**
  * 获取标签栏数据
  */
 private void gettColumnData() {
  channelItems.clear();
  channelItems.add(new ChannelItem(null, "葱葱"));
  channelItems.add(new ChannelItem(null, "飞飞"));
  channelItems.add(new ChannelItem(null, "vv"));
  channelItems.add(new ChannelItem(null, "刚子"));
  channelItems.add(new ChannelItem(null, "最新"));
  /**
   * 标题可以动态设置长度。获取数据添加到集合中展示。
   */
  pagerAdapter.notifyDataSetChanged();
 }
 /**
  *初始化Column栏目项
  */
 private void initTabColumn() {
  mRadioGroup_content.removeAllViews();
  int count = channelItems.size();
  // 设置横向菜单栏中item属性
  mColumnHorizontalScrollView.setParam(getActivity(), mScreenWidth, mRadioGroup_content, null, null, null, null);
  for(int i = 0; i< count; i++){
   LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT , LayoutParams.WRAP_CONTENT);
   params.leftMargin = 6;
   params.rightMargin = 6;
//   TextView localTextView = (TextView) mInflater.inflate(R.layout.column_radio_item, null);
   TextView columnTextView = new TextView(getActivity());
   columnTextView.setTextSize(16);
   columnTextView.setGravity(Gravity.CENTER);
   columnTextView.setPadding(5, 5, 5, 5);
   columnTextView.setId(i);
   columnTextView.setText(channelItems.get(i).getChanneName());
//   columnTextView.setTextColor(getResources().getColorStateList(R.color.top_category_scroll_text_color_day));
   if(columnSelectIndex == i){
    columnTextView.setSelected(true);
   }
   // 对item的监听
   columnTextView.setOnClickListener(new OnClickListener() {
    @Override
    public void onClick(View v) {
     for(int i = 0;i < mRadioGroup_content.getChildCount();i++){
      View localView = mRadioGroup_content.getChildAt(i);
      if (localView != v) {
       localView.setSelected(false);
      }else{
       localView.setSelected(true);
       contentPager.setCurrentItem(i);
      }
     }
//     Toast.makeText(getApplicationContext(), userChannelList.get(v.getId()).getName(), Toast.LENGTH_SHORT).show();
    }
   });
   mRadioGroup_content.addView(columnTextView, i ,params);
  }
 }
 @Override
 public void onClick(View v) {
  // TODO Auto-generated method stub
 }

}

package com.example.app;
import android.app.Activity;
import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.widget.HorizontalScrollView;
import android.widget.ImageView;
public class ColumnHorizontalScrollView extends HorizontalScrollView {
 /** 传入整体布局 */
 private View ll_content;
 /** 传入更多栏目选择布局 */
 private View ll_more;
 /** 传入拖动栏布局 */
 private View rl_column;
 /** 左阴影图片 */
 private ImageView leftImage;
 /** 右阴影图片 */
 private ImageView rightImage;
 /** 屏幕宽度 */
 private int mScreenWitdh = 0;
 /** 父类的活动activity */
 private Activity activity;
 public ColumnHorizontalScrollView(Context context) {
  super(context);
 }
 public ColumnHorizontalScrollView(Context context, AttributeSet attrs) {
  super(context, attrs);
 }
 public ColumnHorizontalScrollView(Context context, AttributeSet attrs,
          int defStyle) {
  super(context, attrs, defStyle);
 }
 /**
  * 在拖动的时候执行
  * */
 @Override
 protected void onScrollChanged(int paramInt1, int paramInt2, int paramInt3, int paramInt4) {
  // TODO Auto-generated method stub
  super.onScrollChanged(paramInt1, paramInt2, paramInt3, paramInt4);
  shade_ShowOrHide();
  if(!activity.isFinishing() && ll_content !=null && leftImage!=null && rightImage!=null && ll_more!=null && rl_column !=null){
   if(ll_content.getWidth() <= mScreenWitdh){
    leftImage.setVisibility(View.GONE);
    rightImage.setVisibility(View.GONE);
   }
  }else{
   return;
  }
  if(paramInt1 ==0){
   leftImage.setVisibility(View.GONE);
   rightImage.setVisibility(View.VISIBLE);
   return;
  }
  if(ll_content.getWidth() - paramInt1 + ll_more.getWidth() + rl_column.getLeft() == mScreenWitdh){
   leftImage.setVisibility(View.VISIBLE);
   rightImage.setVisibility(View.GONE);
   return;
  }
  leftImage.setVisibility(View.VISIBLE);
  rightImage.setVisibility(View.VISIBLE);
 }
 /**
  * 传入父类布局中的资源文件
  * */
 public void setParam(Activity activity, int mScreenWitdh,View paramView1,ImageView paramView2, ImageView paramView3 ,View paramView4,View paramView5){
  this.activity = activity;
  this.mScreenWitdh = mScreenWitdh;
  ll_content = paramView1;
  leftImage = paramView2;
  rightImage = paramView3;
  ll_more = paramView4;
  rl_column = paramView5;
 }
 /**
  * 判断左右阴影的显示隐藏效果
  * */
 public void shade_ShowOrHide() {
  if (!activity.isFinishing() && ll_content != null) {
   measure(0, 0);
   //如果整体宽度小于屏幕宽度的话，那左右阴影都隐藏
   if (mScreenWitdh >= getMeasuredWidth()) {
    leftImage.setVisibility(View.GONE);
    rightImage.setVisibility(View.GONE);
   }
  } else {
   return;
  }
  //如果滑动在最左边时候，左边阴影隐藏，右边显示
  if (getLeft() == 0) {
   leftImage.setVisibility(View.GONE);
   rightImage.setVisibility(View.VISIBLE);
   return;
  }
  //如果滑动在最右边时候，左边阴影显示，右边隐藏
  if (getRight() == getMeasuredWidth() - mScreenWitdh) {
   leftImage.setVisibility(View.VISIBLE);
   rightImage.setVisibility(View.GONE);
   return;
  }
  //否则，说明在中间位置，左、右阴影都显示
  leftImage.setVisibility(View.VISIBLE);
  rightImage.setVisibility(View.VISIBLE);
 }
}