[移动开发]一个不与任何控件进行绑定的可以水平滑动的 TabLayout

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Color;
import android.os.Handler;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.HorizontalScrollView;
import android.widget.LinearLayout;
import android.widget.TextView;

import com.houdask.judicature.exam.R;

import java.util.ArrayList;

/**
 * @deprecated :  一个不与任何控件进行绑定的可以水平滑动的 TabLayout，如果想绑定 ViewPager 或其他控件，
 * 请自行实现监听事件进行控制
 */
public class FreedomSlidingTabLayout extends HorizontalScrollView
        implements View.OnClickListener, View.OnTouchListener {

    /**
     * 滚动状态:
     * IDLE=滚动停止
     * TOUCH_SCROLL=手指拖动滚动
     * FLING=滚动
     */
    public enum ScrollType {IDLE, TOUCH_SCROLL, FLING}

    private Handler mHandler;
    /**
     * 记录当前滚动的距离
     */
    private int currentX = -9999999;

    /**
     * 当前滚动状态
     */
    private ScrollType scrollType = ScrollType.IDLE;
    private OnScrollChangeListener onScrollChangeListener;
    /**
     * 滚动监听间隔:milliseconds
     * 时间越小灵敏度越高
     */
    public int scrollMonitorInterval = 20;

    /**
     * 滚动监听runnable
     */
    private Runnable scrollRunnable = new Runnable() {
        @Override
        public void run() {
            if (getScrollX() == currentX) {
                //滚动停止,取消监听线程
                scrollType = ScrollType.IDLE;
                if (onScrollChangeListener != null) {
                    onScrollChangeListener.onScrollChanged(scrollType);
                }
                mHandler.removeCallbacks(this);
                return;
            } else {
                //手指离开屏幕,但是view还在滚动
                scrollType = ScrollType.FLING;
                if (onScrollChangeListener != null) {
                    onScrollChangeListener.onScrollChanged(scrollType);
                }
            }
            currentX = getScrollX();
            //mHandler.postDelayed(this, 10);
            try {
                Thread.sleep(scrollMonitorInterval);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            run();
        }
    };
    private Context context;
    private ArrayList<String> titles = new ArrayList<>();
    private LinearLayout viewGroup;
    /**
     * 上一次被选中的Item
     */
    private int lastPosition = -1;
    private int currentPosition = -1;

    public FreedomSlidingTabLayout(Context context) {
        super(context);
        this.context = context;
        init();
    }

    public FreedomSlidingTabLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
        TypedArray array = context.obtainStyledAttributes(attrs,
                R.styleable.FreedomSlidingTabLayout);
        itemSelectTextColor =
                array.getColor(R.styleable.FreedomSlidingTabLayout_fs_itemSelectTextColor,
                        Color.BLACK);
        itemTextColor = array.getColor(R.styleable.FreedomSlidingTabLayout_fs_itemTextColor,
                Color.BLACK);
        itemMargins = array.getDimension(R.styleable.FreedomSlidingTabLayout_fs_itemMargins, 0);
        itemBackGround = array.getColor(R.styleable.FreedomSlidingTabLayout_fs_itemBackGround,
                Color.WHITE);
        //        itemTextStyle = array.gete(R.styleable.FreedomSlidingTabLayout_fs_itemTextStyle,
        //                TextStyle.NARROW);
        itemTextSize = array.getDimension(R.styleable.FreedomSlidingTabLayout_fs_itemTextSize,
                R.dimen.sixteen_sp);
        this.context = context;
        init();
    }

    private int itemSelectTextColor;
    private int itemTextColor;
    private float itemMargins;
    private int itemBackGround;
    private int itemTextStyle;
    private float itemTextSize;

    private void setItemSelectChange(int position) {
        if (currentPosition == position) {
            return;
        }
        lastPosition = currentPosition;
        currentPosition = position;
        TextView currentView = (TextView) viewGroup.getChildAt(currentPosition);
        currentView.setTextColor(itemSelectTextColor);
        TextView lastView = (TextView) viewGroup.getChildAt(lastPosition);
        lastView.setTextColor(itemTextColor);
    }

    public FreedomSlidingTabLayout(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        TypedArray array = context.obtainStyledAttributes(attrs,
                R.styleable.FreedomSlidingTabLayout);
        itemSelectTextColor =
                array.getColor(R.styleable.FreedomSlidingTabLayout_fs_itemSelectTextColor,
                        Color.BLACK);
        itemTextColor = array.getColor(R.styleable.FreedomSlidingTabLayout_fs_itemTextColor,
                Color.BLACK);
        itemMargins = array.getDimension(R.styleable.FreedomSlidingTabLayout_fs_itemMargins, 0);
        itemBackGround = array.getColor(R.styleable.FreedomSlidingTabLayout_fs_itemBackGround,
                Color.WHITE);
        //        itemTextStyle = array.gete(R.styleable.FreedomSlidingTabLayout_fs_itemTextStyle,
        //                TextStyle.NARROW);
        itemTextSize = array.getDimension(R.styleable.FreedomSlidingTabLayout_fs_itemTextSize,
                R.dimen.sixteen_sp);
        this.context = context;
        init();
    }

    private void init() {
        setting();
        initViewGroup();
        addView(viewGroup);
    }

    /**
     * 初始化 viewGroup(LinearLayout)
     */
    private void initViewGroup() {
        viewGroup = new LinearLayout(context);
        LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(
                LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.MATCH_PARENT);
        viewGroup.setOrientation(LinearLayout.HORIZONTAL);
        viewGroup.setLayoutParams(layoutParams);
    }

    /**
     * 清空 @{viewGroup(LinearLayout)}，重新创建 Item 并填充到 viewGroup 中
     */
    private void initChildView() {
        if (titles != null && titles.size() > 0) {
            viewGroup.removeAllViews();
            for (int i = 0; i < titles.size(); i++) {
                TextView textView = new TextView(context);
                LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(
                        ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.MATCH_PARENT);
                if (i != 0) {
                    layoutParams.setMargins((int) itemMargins, 0, 0, 0);
                }
                textView.setGravity(Gravity.CENTER);
                textView.setText(titles.get(i));
                //                textView.setTypeface(Typeface.defaultFromStyle(itemTextStyle));
                textView.setTag(i);
                 /*此处如果直接使用 textView.setTextSize() 设置文字大小会导致文字大于正常值*/
                textView.getPaint().setTextSize(itemTextSize);
                if (i == 0) {
                   if (currentPosition < 0) {
                        currentPosition = 0;
                        /* 如果与其他控件进行关联，第一次初始化内容是可能导致无法与其他控件联动，
                         * 所以在此处进行判断，如果 currentPosition < 0 （代表是第一次初始化，
                         * 没有进行点击操作），回调一次点击事件。*/
                        if (onScrollChangeListener != null) {
                            onScrollChangeListener.onItemSelset(textView, currentPosition);
                        }
                    }
                    textView.setTextColor(itemSelectTextColor);
                } else {
                    textView.setTextColor(itemTextColor);
                }
                textView.setClickable(true);
                textView.setOnClickListener(this);
                textView.setLayoutParams(layoutParams);
                viewGroup.addView(textView);
            }
        }
    }

    /**
     * HorizontalScrollView 属性设置
     */
    private void setting() {
        mHandler = new Handler();
        setHorizontalScrollBarEnabled(false);
        setOnTouchListener(this);
    }

    /**
     * 将当前控件滑动到父控件正中位置（可以的话）
     */
    private void setViewToCenter(View view) {
        int scrollViewWidth = this.getWidth();
        /*当前Item的左侧坐标位置加上Item宽度的一半，这个长度相当于当前Item的中心位置距离父控件左侧的距离*/
        int rb_px = (int) view.getX() + view.getWidth() / 2;
        /*当前Item中心位置减去父控件中心位置等于当前Item距正中的距离*/
        this.smoothScrollTo(rb_px - scrollViewWidth / 2, 0);
    }

    /**
     * 清除原有数据（如果有），重新设置数据源，并开始绘制TabLayout
     * 每次调用该方法都会重新绘制一遍所有控件
     */
    public void setTabData(ArrayList<String> titles) {
        this.titles.clear();
        this.titles = new ArrayList<>();
        this.titles.addAll(titles);
        this.post(new Runnable() {
            @Override
            public void run() {
                initChildView();
            }
        });
    }

    /**
     * 将选定位置的Item移动到父控件正中位置
     */
    public void setCurrentItem(final int position) {
        /*防止在Item还没有绘制完就调用当前方法的状况*/
        viewGroup.post(new Runnable() {
            @Override
            public void run() {
                View view = viewGroup.getChildAt(position);
                setViewToCenter(view);
                setItemSelectChange(position);
                if (onScrollChangeListener != null) {
                    mHandler.post(scrollRunnable);
                    onScrollChangeListener.onItemSelset(view, currentPosition);
                }
            }
        });
    }

    /**
     * 滑动与点击事件的监听
     */
    public void setScrollMonitorInterval(int scrollMonitorInterval) {
        this.scrollMonitorInterval = scrollMonitorInterval;
    }

    @Override
    public boolean onTouch(View v, MotionEvent event) {
        switch (event.getAction()) {
            case MotionEvent.ACTION_MOVE:
                this.scrollType = ScrollType.TOUCH_SCROLL;
                onScrollChangeListener.onScrollChanged(scrollType);
                mHandler.removeCallbacks(scrollRunnable);
                break;
            case MotionEvent.ACTION_UP:
                mHandler.post(scrollRunnable);
                break;
        }
        return super.onTouchEvent(event);
    }

    @Override
    public void onClick(View view) {
        setViewToCenter(view);
        setItemSelectChange((int) view.getTag());
        if (onScrollChangeListener != null) {
            mHandler.post(scrollRunnable);
            onScrollChangeListener.onItemSelset(view, currentPosition);
        }
    }

    /**
     * 设置滚动监听间隔:milliseconds
     * 时间越小灵敏度越高
     */
    public void setOnScrollChangeListener(OnScrollChangeListener listener) {
        onScrollChangeListener = listener;
    }

    public interface OnScrollChangeListener {
        void onItemSelset(View view, int position);

        void onScrollChanged(ScrollType scrollType);
    }
}

    <declare-styleable name="FreedomSlidingTabLayout">
        <attr name="fs_itemSelectTextColor" format="color" />
        <attr name="fs_itemTextColor" format="color" />
        <attr name="fs_itemMargins" format="dimension" />
        <attr name="fs_itemBackGround" format="color" />
        <attr name="fs_itemTextStyle" format="enum" />
        <attr name="fs_itemTextSize" format="dimension" />
    </declare-styleable>