Android自定义TabLayout效果

@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
 if (positionOffset>1){
  return;
 }
 int leftCop = (int) (positionOffset*(getMeasuredWidth()/mMaxLineNum)+position*getMeasuredWidth()/mMaxLineNum);
 if (leftCop!=leftForTabLayout){
  //这里要做判断是否滑动,当选择的位置大于TabLayout中显示的最大数-1时，会向左右滑动，指示器也会
  //跟这滑动，相对静止，否则指示器滑动，Tab布局不移动
  if (position>=mMaxLineNum-1) {
   scrollContent += leftCop - leftForTabLayout;
   scrollTo(scrollContent, 0);
   //这里要重新layout
   update();
  }
  leftForTabLayout = leftCop;
  invalidate();
 }
}

 private void update() {
 for (int i = 0; i 

@Override
protected void onDraw(Canvas canvas) {
 //left = getMeasuredWidth() / mChildCount * mSelectPosition;
 super.onDraw(canvas);
 mPaint.setColor(Color.GREEN);
 int top = getMeasuredHeight() / 4;
 int right = leftForTabLayout + getMeasuredWidth() / mMaxLineNum;
 int bottom = getMeasuredHeight() - getMeasuredHeight() / 4;
 RectF rectF = new RectF(leftForTabLayout, top, right, bottom);
 mPaint.setAntiAlias(true);
 mPaint.setStyle(Paint.Style.FILL);
 canvas.drawRoundRect(rectF, 10, 10, mPaint);
 mPaint.setColor(Color.RED);
 mPaint.setStrokeWidth(5);
 canvas.drawLine(leftForTabLayout,getMeasuredHeight()-5,right,getMeasuredHeight()-5,mPaint);

}

 /**
 * 于ViewPager建立联系,这里必须先要给ViewPager设置Adapter
 *
 * @param viewPager
 */
public void setUpWithViewPager(ViewPager viewPager) {
 mViewPager = viewPager;
 mChildCount = viewPager.getAdapter().getCount();
 mSelectPosition = viewPager.getCurrentItem();
 viewPager.setOnPageChangeListener(this);
}

/**
 * 为Tab添加View
 */
private void init() {
 setWillNotDraw(false);
 mPaint = new Paint();
 for (int i = 0; i 

package a6he.android.yzz.com.mytablayout;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.RectF;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.util.Log;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.Switch;
import android.widget.TextView;

/**
 * Created by yzz on 2017/2/24 0024.
 * 

 * 实现背景随着ViewPager的滑动跟着移动
 */
public class YzzTab extends LinearLayout implements ViewPager.OnPageChangeListener {

private ViewPager mViewPager;
private Paint mPaint;
//tab的数量
private int mChildCount;
//tab选中的位置
private int mSelectPosition;
//绘制指向器的左顶点
private int leftForTabLayout = 0;
private int leftForInvidator = 0;
private int mMaxLineNum = 3;
private int scrollCOntent= 0;
private onTabSelecterListener monTabSelecterListener;

public YzzTab(Context context) {
 super(context);
}

public YzzTab(Context context, AttributeSet attrs) {
 super(context, attrs);
}

public YzzTab(Context context, AttributeSet attrs, int defStyleAttr) {
 super(context, attrs, defStyleAttr);
}

@Override
protected void onFinishInflate() {
 super.onFinishInflate();

}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
 super.onMeasure(widthMeasureSpec, heightMeasureSpec);
 init();
}


/**
 * 于ViewPager建立联系,这里必须先要给ViewPager设置Adapter
 *
 * @param viewPager
 */
public void setUpWithViewPager(ViewPager viewPager) {
 mViewPager = viewPager;
 mChildCount = viewPager.getAdapter().getCount();
 mSelectPosition = viewPager.getCurrentItem();
 viewPager.setOnPageChangeListener(this);

}

/**
 * 为Tab添加View
 */
private void init() {
 setWillNotDraw(false);
 mPaint = new Paint();
 for (int i = 0; i 1){
  return;
 }
 int leftCop = (int) (positionOffset*(getMeasuredWidth()/mMaxLineNum)+position*getMeasuredWidth()/mMaxLineNum);
 if (leftCop!=leftForTabLayout){
  //这里要做判断是否滑动,当选择的位置大于TabLayout中显示的最大数-1时，会向左右滑动，指示器也会
  //跟这滑动，相对静止，否则指示器滑动，Tab布局不移动
  if (position>=mMaxLineNum-1) {
   scrollContent += leftCop - leftForTabLayout;
   scrollTo(scrollContent, 0);
   //这里要重新layout
   update();
  }
  leftForTabLayout = leftCop;
  invalidate();
 }
}

private void update() {
 for (int i = 0; i