Android仿今日头条滑动页面导航效果

<&＃63;xml version="1.0" encoding="utf-8"&＃63;> 
 
 
  
 
  
 
 
 

package com.hankkin.PagerSlidingTabStrip.adapter; 
 
import android.support.v4.app.Fragment; 
import android.support.v4.app.FragmentManager; 
import android.support.v4.app.FragmentPagerAdapter; 
import com.hankkin.PagerSlidingTabStrip.fragment.AndroidFragment; 
import com.hankkin.PagerSlidingTabStrip.fragment.JavaFragment; 
import com.hankkin.PagerSlidingTabStrip.fragment.ObjectCFragment; 
 
import java.util.List; 
 
public class MyAdapter extends FragmentPagerAdapter { 
 private AndroidFragment androidFragment; 
 private JavaFragment javaFragment; 
 private ObjectCFragment objectCFragment; 
 private String[] titles; 
 public MyAdapter(FragmentManager fm,String[] titles) { 
 super(fm); 
 this.titles = titles; 
 } 
 
 @Override 
 public Fragment getItem(int position) { 
 switch (position) { 
 case 0: 
 if (androidFragment == null) { 
  androidFragment = new AndroidFragment(); 
 } 
 return androidFragment; 
 case 1: 
 if (javaFragment == null) { 
  javaFragment = new JavaFragment(); 
 } 
 return javaFragment; 
 case 2: 
 if (objectCFragment == null) { 
  objectCFragment = new ObjectCFragment(); 
 } 
 return objectCFragment; 
 default: 
 return null; 
 } 
 } 
 
 @Override 
 public int getCount() { 
 return titles.length; 
 } 
 
 public String getPageTitle(int i){ 
 return titles[i]; 
 } 
 
} 
 

 private void initViews(){ 
 fragments = new ArrayList<>(); 
 pagerTab = (PagerSlidingTabStrip) findViewById(R.id.tab); 
 pager = (ViewPager) findViewById(R.id.pager); 
 
 for (int i=0;i 

private int indicatorColor = 0xFF666666;// 滑动指示器颜色 
private int underlineColor = 0x1A000000;//在视图的底部的全宽度的线pstsunderlinecolor颜色 
private int dividerColor = 0x1A000000;//选项卡之间的分隔pstsdividercolor颜色 
 
private boolean shouldExpand = false;//pstsshouldexpand如果设置为TRUE，每个标签都给予同样的重量，默认为false 
private boolean textAllCaps = true;//pststextallcaps如果为真，所有选项卡标题都是大写，默认为true 
 
private int scrollOffset = 52;//pstsscrolloffset卷轴被选择的标签的偏移 
private int indicatorHeight = 8;//滑动指示器pstsindicatorheight 
private int underlineHeight = 2;//在视图的底部的全宽度的线pstsunderlineheight高度 
private int dividerPadding = 12;//pstsdividerpadding顶部和底部填充的分频器 
private int tabPadding = 24;//pststabpaddingleftright左、右填充每个选项卡 
private int dividerWidth = 1;//选项卡分割线宽度 
 
private int tabTextSize = 12;//选项卡字体大小 
private int tabTextColor = 0xFF666666;//选项卡字体颜色 
private int selectedTabTextColor = 0xFF666666;//当前选中字体颜色 
private Typeface tabTypeface = null; 
private int tabTypefaceStyle = Typeface.NORMAL; 
 
private int lastScrollX = 0; 
 
private int tabBackgroundResId = R.drawable.background;//pststabbackground背景绘制的每个标签，应该是一个statelistdrawable 

public PagerSlidingTabStrip(Context context, AttributeSet attrs, int defStyle) { 
 super(context, attrs, defStyle); 
 
 setFillViewport(true);//默认使子view可以拉伸来填满整个屏幕 
 setWillNotDraw(false);//默认不执行OnDraw()方法 
 //初始化盛放按钮标题的线性布局 
 tabsCOntainer= new LinearLayout(context); 
 tabsContainer.setOrientation(LinearLayout.HORIZONTAL); 
 tabsContainer.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT)); 
 addView(tabsContainer); 
 
 DisplayMetrics dm = getResources().getDisplayMetrics(); 
 //导入相应资源文件 
 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); 
 dividerPadding = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dividerPadding, dm); 
 tabPadding = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, tabPadding, dm); 
 dividerWidth = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dividerWidth, dm); 
 tabTextSize = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, tabTextSize, dm); 
 
 // get system attrs (android:textSize and android:textColor) 
 
 TypedArray a = context.obtainStyledAttributes(attrs, ATTRS); 
 
 tabTextSize = a.getDimensionPixelSize(0, tabTextSize); 
 tabTextColor = a.getColor(1, tabTextColor); 
 
 a.recycle(); 
 
 // get custom attrs 
 
 a = context.obtainStyledAttributes(attrs, R.styleable.PagerSlidingTabStrip); 
 
 indicatorColor = a.getColor(R.styleable.PagerSlidingTabStrip_pstsIndicatorColor, indicatorColor); 
 
 //tab文字选中时的颜色,默认和滑动指示器的颜色一致 
 selectedTabTextColor=a.getColor(R.styleable.PagerSlidingTabStrip_selectedTabTextColor, indicatorColor); 
 //初始化属性样式 
 underlineColor = a.getColor(R.styleable.PagerSlidingTabStrip_pstsUnderlineColor, underlineColor); 
 dividerColor = a.getColor(R.styleable.PagerSlidingTabStrip_pstsDividerColor, dividerColor); 
 indicatorHeight = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_pstsIndicatorHeight, indicatorHeight); 
 underlineHeight = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_pstsUnderlineHeight, underlineHeight); 
 dividerPadding = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_pstsDividerPadding, dividerPadding); 
 tabPadding = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_pstsTabPaddingLeftRight, tabPadding); 
 tabBackgroundResId = a.getResourceId(R.styleable.PagerSlidingTabStrip_pstsTabBackground, tabBackgroundResId); 
 shouldExpand = a.getBoolean(R.styleable.PagerSlidingTabStrip_pstsShouldExpand, shouldExpand); 
 scrollOffset = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_pstsScrollOffset, scrollOffset); 
 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); 
 
 if (locale == null) { 
 locale = getResources().getConfiguration().locale; 
 } 
 } 

private class PageListener implements OnPageChangeListener { 
 
 @Override 
 public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { 
 currentPosition = position; 
 currentPositiOnOffset= positionOffset; 
 
 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) { 
 selectedPosition = position; 
 updateTabStyles(); 
 if (delegatePageListener != null) { 
 delegatePageListener.onPageSelected(position); 
 } 
 } 
 
 } 

private void updateTabStyles() { 
 
 for (int i = 0; i = Build.VERSION_CODES.ICE_CREAM_SANDWICH) { 
  tab.setAllCaps(true); 
  } else { 
  tab.setText(tab.getText().toString().toUpperCase(locale)); 
  } 
 } 
 if (i == selectedPosition) { 
  tab.setTextColor(selectedTabTextColor); 
 } 
 } 
 } 
 
 }