Android tab切换控件

  基于viewpager，实现了可以点击tab，可页面左右滑动，tab变化，tab下标动画等。

  分为四个部分：

  第一个FragTabsViewPager，让您想要实现的页面继承它。

package com.base;

import java.util.List;

import com.shennongshi.dingdong.R;
import com.third.widget.PagerSlidingTabStrip;
import com.utils.data.PhoneInfo;

import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public abstract class FragTabsViewPager extends FragBase {

	protected View mView;
	protected boolean mIsDrawDivider = true;
	public ViewPager mViewPager;
	protected static int mTabPaddingLeftRight = (int) (PhoneInfo.convertDpToPx(2));
	 
	@Override
	protected View initContainerView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    	mView = inflater.inflate(R.layout.frag_tabs_viewpager, container, false);
    	mViewPager = initViewPager(mView);
        initTabs(mView);
        return mView;
	}

	protected abstract List getIndicatorViews();

    protected abstract List> getFragClasses();
    
    protected abstract List getBundles();
    
    protected ViewPager initViewPager(View view) {
    	ViewPager viewPager = (ViewPager) view.findViewById(R.id.pager);
    	FragmentActivity act = getActivity();
        FragTabsAdapter adapter = new FragTabsAdapter(act, getChildFragmentManager(), getFragClasses(), getBundles());
        viewPager.setAdapter(adapter);
		return viewPager;
    }
    
    protected void initTabs(View view) {
        PagerSlidingTabStrip tabs = (PagerSlidingTabStrip) view.findViewById(R.id.tabs);
        List tabViews = getIndicatorViews();
        int count = 0;
        if (tabViews != null) count = tabViews.size();
        tabs.setShouldExpand(true);
        tabs.setUnderlineColorResource(R.color.background);
        tabs.setIndicatorColorResource(R.color.mainblue);
		tabs.setViewPager(mViewPager);
		for (int i = 0; i < count; i++) {
			tabs.addTab(i, tabViews.get(i));
		}
		if (tabViews.size() > 0)
		tabViews.get(0).setSelected(true);
    }
}

相应的xml文件，frag_tabs_viewpager：

tab动画类PagerSlidingTabStrip：

package com.third.widget;

import com.shennongshi.dingdong.R;

import android.annotation.SuppressLint;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.os.Build;
import android.os.Parcel;
import android.os.Parcelable;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.util.TypedValue;
import android.view.View;
import android.view.ViewTreeObserver.OnGlobalLayoutListener;
import android.widget.HorizontalScrollView;
import android.widget.LinearLayout;

public class PagerSlidingTabStrip extends HorizontalScrollView {

    protected LinearLayout.LayoutParams defaultTabLayoutParams;
    protected LinearLayout.LayoutParams expandedTabLayoutParams;

    protected final PageListener pageListener = new PageListener();
    public OnPageChangeListener delegatePageListener;

    protected LinearLayout tabsContainer;
    protected ViewPager pager;

    protected int tabCount;
    protected int currentPosition = 0;
    protected float currentPositionOffset = 0f;

    private Paint dividerPaint;
    protected Paint rectPaint;

    protected int indicatorColor = 0xFF666666;
    protected int underlineColor = 0x1A000000;
    protected int dividerColor = 0x1A000000;

    protected boolean shouldExpand = false;
    protected boolean textAllCaps = true;
    protected boolean drawDivider = false;

    protected int scrollOffset = 52;
    protected int indicatorHeight = 8;
    protected int underlineHeight = 2;
    private int dividerPadding = 12;
    private int dividerWidth = 1;

    protected int lastScrollX = 0;

    public PagerSlidingTabStrip(Context context) {
        this(context, null);
    }

    public PagerSlidingTabStrip(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public PagerSlidingTabStrip(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);

        setFillViewport(true);
        setWillNotDraw(false);

        tabsContainer = new LinearLayout(context);
        tabsContainer.setOrientation(LinearLayout.HORIZONTAL);
        tabsContainer.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
        addView(tabsContainer);
        DisplayMetrics dm = getResources().getDisplayMetrics();

        scrollOffset = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, scrollOffset, dm);
        indicatorHeight = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, indicatorHeight, dm);
        underlineHeight = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, underlineHeight, dm);

        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.PagerSlidingTabStrip);

        indicatorColor = a.getColor(R.styleable.PagerSlidingTabStrip_pstsIndicatorColor, indicatorColor);
        underlineColor = a.getColor(R.styleable.PagerSlidingTabStrip_pstsUnderlineColor, underlineColor);
        dividerColor = a.getColor(R.styleable.PagerSlidingTabStrip_pstsDividerColor, dividerColor);
        indicatorHeight = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_pstsIndicatorHeight, indicatorHeight);
        dividerPadding = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_pstsDividerPadding, dividerPadding);
        underlineHeight = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_pstsUnderlineHeight, underlineHeight);
        shouldExpand = a.getBoolean(R.styleable.PagerSlidingTabStrip_pstsShouldExpand, shouldExpand);
        scrollOffset = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_pstsScrollOffset, scrollOffset);
        dividerWidth = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dividerWidth, dm);
        textAllCaps = a.getBoolean(R.styleable.PagerSlidingTabStrip_pstsTextAllCaps, textAllCaps);

        a.recycle();

        rectPaint = new Paint();
        rectPaint.setAntiAlias(true);
        rectPaint.setStyle(Style.FILL);
        
        dividerPaint = new Paint();
        dividerPaint.setAntiAlias(true);
        dividerPaint.setStrokeWidth(dividerWidth);

        defaultTabLayoutParams = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.MATCH_PARENT);
        expandedTabLayoutParams = new LinearLayout.LayoutParams(0, LayoutParams.MATCH_PARENT, 1.0f);
    }

    public void setViewPager(ViewPager pager) {
        this.pager = pager;

        if (pager.getAdapter() == null) {
            throw new IllegalStateException("ViewPager does not have adapter instance.");
        }

        pager.setOnPageChangeListener(pageListener);

        notifyDataSetChanged();
    }

    public void setOnPageChangeListener(OnPageChangeListener listener) {
        this.delegatePageListener = listener;
    }

    public void notifyDataSetChanged() {
    	tabCount = pager.getAdapter().getCount();
        getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() {

            @SuppressWarnings("deprecation")
            @SuppressLint("NewApi")
            @Override
            public void onGlobalLayout() {

                if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN) {
                    getViewTreeObserver().removeGlobalOnLayoutListener(this);
                } else {
                    getViewTreeObserver().removeOnGlobalLayoutListener(this);
                }

                currentPosition = pager.getCurrentItem();
                scrollToChild(currentPosition, 0);
            }
        });

    }

    public void addTab(final int position, View tab) {
        tab.setFocusable(true);
        tab.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
            	if(tabsContainer.getChildCount() != 0){
            		tabsContainer.getChildAt(currentPosition).setSelected(false);
            		tabsContainer.getChildAt(position).setSelected(true);
            		pager.setCurrentItem(position);
            	}
            }
        });

        tabsContainer.addView(tab, position, shouldExpand ? expandedTabLayoutParams : defaultTabLayoutParams);
    }

    private void scrollToChild(int position, int offset) {

        if (tabCount == 0) {
            return;
        }

        int newScrollX = 0;
        if(tabsContainer.getChildCount() != 0)
            newScrollX = tabsContainer.getChildAt(position).getLeft() + offset;

        if (position > 0 || offset > 0) {
            newScrollX -= scrollOffset;
        }

        if (newScrollX != lastScrollX) {
            lastScrollX = newScrollX;
            scrollTo(newScrollX, 0);
        }

    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);

        if (isInEditMode() || tabCount == 0) {
            return;
        }

        final int height = getHeight();
        // default: line below current tab
        float lineLeft = 0;
        float lineRight = 0;
        if(tabsContainer.getChildCount() != 0){
        	View currentTab = tabsContainer.getChildAt(currentPosition);
        	lineLeft = currentTab.getLeft();
        	lineRight = currentTab.getRight();
        }

        // if there is an offset, start interpolating left and right coordinates between current and next tab
        if (currentPositionOffset > 0f && currentPosition < tabCount - 1) {

        	float nextTabLeft = 0;
            float nextTabRight = 0;
            if(tabsContainer.getChildCount() != 0){
            	View nextTab = tabsContainer.getChildAt(currentPosition + 1);
            	nextTabLeft = nextTab.getLeft();
            	nextTabRight = nextTab.getRight();
            }

            lineLeft = (currentPositionOffset * nextTabLeft + (1f - currentPositionOffset) * lineLeft);
            lineRight = (currentPositionOffset * nextTabRight + (1f - currentPositionOffset) * lineRight);
        }
        
        // draw indicator line
        rectPaint.setColor(indicatorColor);
        canvas.drawRect(lineLeft + 70, height - indicatorHeight, lineRight - 70, height, rectPaint);

        // draw underline
        rectPaint.setColor(underlineColor);
        canvas.drawRect(0, height - 3 *underlineHeight, tabsContainer.getWidth(), height , rectPaint);
        
        // draw divider
        if (drawDivider) {
        	dividerPaint.setColor(dividerColor);
        	for (int i = 0; i < tabCount - 1; i++) {
        		View tab = tabsContainer.getChildAt(i);
        		canvas.drawLine(tab.getRight(), dividerPadding, tab.getRight(), height - dividerPadding, dividerPaint);
        	}
        }
    }

    private class PageListener implements OnPageChangeListener {

        @Override
        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
        	if (currentPosition != position) {
        		View oldTab = tabsContainer.getChildAt(currentPosition);
        		View newTab = tabsContainer.getChildAt(position);
        		oldTab.setSelected(false);
        		newTab.setSelected(true);
        	}
        	currentPosition = position;
            currentPositionOffset = positionOffset;

            if(tabsContainer.getChildCount() != 0)
                scrollToChild(position, (int) (positionOffset * tabsContainer.getChildAt(position).getWidth()));

            invalidate();

            if (delegatePageListener != null) {
                delegatePageListener.onPageScrolled(position, positionOffset, positionOffsetPixels);
            }
        }

        @Override
        public void onPageScrollStateChanged(int state) {
        	if (state == ViewPager.SCROLL_STATE_IDLE) {
        		scrollToChild(pager.getCurrentItem(), 0);
        	}
        	if (delegatePageListener != null) {
        		delegatePageListener.onPageScrollStateChanged(state);
        	}
        }

        @Override
        public void onPageSelected(int position) {
        	if (delegatePageListener != null) {
        		delegatePageListener.onPageSelected(position);
        	}
        }
    }

    public void setDrawDivider(boolean divider) {
    	this.drawDivider = divider;
    	invalidate();
    }
    
    public void setIndicatorColor(int indicatorColor) {
        this.indicatorColor = indicatorColor;
        invalidate();
    }

    public void setIndicatorColorResource(int resId) {
        this.indicatorColor = getResources().getColor(resId);
        invalidate();
    }

    public int getIndicatorColor() {
        return this.indicatorColor;
    }

    public void setUnderlineColor(int underlineColor) {
        this.underlineColor = underlineColor;
        invalidate();
    }

    public void setUnderlineColorResource(int resId) {
        this.underlineColor = getResources().getColor(resId);
        invalidate();
    }

    public int getUnderlineColor() {
        return underlineColor;
    }

    public void setDividerColor(int dividerColor) {
        this.dividerColor = dividerColor;
        invalidate();
    }

    public void setDividerColorResource(int resId) {
        this.dividerColor = getResources().getColor(resId);
        invalidate();
    }

    public int getDividerColor() {
        return dividerColor;
    }
    
    public void setIndicatorHeight(int indicatorLineHeightPx) {
        this.indicatorHeight = indicatorLineHeightPx;
        invalidate();
    }

    public int getIndicatorHeight() {
        return indicatorHeight;
    }

    public void setUnderlineHeight(int underlineHeightPx) {
        this.underlineHeight = underlineHeightPx;
        invalidate();
    }

    public int getUnderlineHeight() {
        return underlineHeight;
    }

    public void setScrollOffset(int scrollOffsetPx) {
        this.scrollOffset = scrollOffsetPx;
        invalidate();
    }

    public int getScrollOffset() {
        return scrollOffset;
    }

    public void setShouldExpand(boolean shouldExpand) {
        this.shouldExpand = shouldExpand;
        requestLayout();
    }

    public boolean getShouldExpand() {
        return shouldExpand;
    }

    public boolean isTextAllCaps() {
        return textAllCaps;
    }

    public void setAllCaps(boolean textAllCaps) {
        this.textAllCaps = textAllCaps;
    }

    @Override
    public void onRestoreInstanceState(Parcelable state) {
        SavedState savedState = (SavedState) state;
        super.onRestoreInstanceState(savedState.getSuperState());
        currentPosition = savedState.currentPosition;
        requestLayout();
    }

    @Override
    public Parcelable onSaveInstanceState() {
        Parcelable superState = super.onSaveInstanceState();
        SavedState savedState = new SavedState(superState);
        savedState.currentPosition = currentPosition;
        return savedState;
    }

    static class SavedState extends BaseSavedState {
        int currentPosition;

        public SavedState(Parcelable superState) {
            super(superState);
        }

        private SavedState(Parcel in) {
            super(in);
            currentPosition = in.readInt();
        }

        @Override
        public void writeToParcel(Parcel dest, int flags) {
            super.writeToParcel(dest, flags);
            dest.writeInt(currentPosition);
        }

        public static final Parcelable.Creator CREATOR = new Parcelable.Creator() {
            @Override
            public SavedState createFromParcel(Parcel in) {
                return new SavedState(in);
            }

            @Override
            public SavedState[] newArray(int size) {
                return new SavedState[size];
            }
        };
    }

}

然后相应的xml文件pagerslidingtabstrip：

下面举例使用：这个fragment继承了fragtabviewpager。

package com.shennongshi.dingdong.ui.xuewen.liebiao;

import java.util.ArrayList;
import java.util.List;

import com.base.ActBase;
import com.base.ActGuide;
import com.base.FragTabsAdapter;
import com.base.FragTabsViewPager;
import com.base.ViewTitle;
import com.shennongshi.dingdong.R;
import com.shennongshi.dingdong.ui.fanganliebiao1.FragFALB1;
import com.shennongshi.dingdong.ui.fanganliebiao2.FragFALB2;
import com.shennongshi.dingdong.ui.fanganliebiao3.FragFALB3;

import android.media.MediaPlayer;
import android.os.Bundle;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.widget.ImageButton;
import android.widget.ImageView.ScaleType;
import android.widget.TextView;
/**
 * @author lrz
 * xuewen 
 */
public class FragXuewenliebiao extends FragTabsViewPager {
	private FragWYHD fragWYHD;
	private FragWDTW fragWDTW;
	private FragWDHD fragWDHD;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
	}
	
	@Override
	protected View initContainerView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
	View view=	super.initContainerView(inflater, container, savedInstanceState);
		return view;
	}
	
	}
	@Override
	protected List getIndicatorViews() {
		List views=new ArrayList(3);
		ViewGroup view=(ViewGroup) ViewGroup.inflate(getActivity(), R.layout.frag_xuewen_header, null);
		View frag_xuewen_WYHD =view.findViewById(R.id.frag_xuewen_WYHD);
		views.add(frag_xuewen_WYHD);
		view.removeView(frag_xuewen_WYHD);
		View frag_xuewen_WDTW =view.findViewById(R.id.frag_xuewen_WDTW);
		views.add(frag_xuewen_WDTW);
		view.removeView(frag_xuewen_WDTW);
		View frag_xuewen_WDHD =view.findViewById(R.id.frag_xuewen_WDHD);
		views.add(frag_xuewen_WDHD);
		view.removeView(frag_xuewen_WDHD);
		return views;
	}
	
	
	@Override
	protected List> getFragClasses() {
		List> frags = new ArrayList>(3);
		frags.add(FragWYHD.class);
		frags.add(FragWDTW.class);
		frags.add(FragWDHD.class);
		return frags;
	}

	@Override
	protected List getBundles() {
		// TODO Auto-generated method stub
		return null;
	}
	

}