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Android 标签栏pagerslidingtabstrip用法实例（含Demo）

2022-01-19 128
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简介： Android 标签栏pagerslidingtabstrip用法实例（含Demo）

image.png

（效果图来源于自己写的demo，双击可放大）


大家肯定对这种可滑动的导航标题并不陌生，项目中经常需要用到这种滑动切换的效果，我觉得PagerSlidingTabStrip搭配viewPager的组合最好用了。PagerSlidingTabStrip是一个开源框架，和github上面的其他开源框架使用方法一样


开源框架地址：GitHub - astuetz/PagerSlidingTabStrip: An interactive indicator to navigate between the different pages of a ViewPager


我自己习惯用eclipse写个demo,将核心源码拷贝到项目中方便查看，话不多说，上代码


核心的类PagerSlidingTabStrip

package com.baobao.pagerslidingtabstrip;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.Typeface;
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.Gravity;
import android.view.View;
import android.view.ViewTreeObserver.OnGlobalLayoutListener;
import android.widget.HorizontalScrollView;
import android.widget.ImageButton;
import android.widget.LinearLayout;
import android.widget.TextView;
import java.util.Locale;
public class PagerSlidingTabStrip extends HorizontalScrollView {
  public interface IconTabProvider {
    public int getPageIconResId(int position);
  }
  // @formatter:off
  private static final int[] ATTRS = new int[] { android.R.attr.textSize,
      android.R.attr.textColor };
  // @formatter:on
  private LinearLayout.LayoutParams defaultTabLayoutParams;
  private LinearLayout.LayoutParams expandedTabLayoutParams;
  private final PageListener pageListener = new PageListener();
  public OnPageChangeListener delegatePageListener;
  private LinearLayout tabsContainer;
  private ViewPager pager;
  private int tabCount;
  private int currentPosition = 0;
  private int selectedPosition = 0;
  private float currentPositionOffset = 0f;
  private Paint rectPaint;
  private Paint dividerPaint;
  private int indicatorColor = 0xFF666666;
  private int underlineColor = 0x1A000000;
  private int dividerColor = 0x1A000000;
  private boolean shouldExpand = false;
  private boolean textAllCaps = true;
  private int scrollOffset = 52;
  private int indicatorHeight = 8;
  private int underlineHeight = 2;
  private int dividerPadding = 12;
  private int tabPadding = 24;
  private int dividerWidth = 1;
  private int tabTextSize = 12;
  private int tabTextColor = 0xFF666666;
  private int selectedTabTextColor = 0xFF666666;
  private Typeface tabTypeface = null;
  private int tabTypefaceStyle = Typeface.NORMAL;
  private int lastScrollX = 0;
  private int tabBackgroundResId = R.drawable.background_tab;
  private Locale locale;
  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);
    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);
    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;
    }
  }
  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() {
    tabsContainer.removeAllViews();
    tabCount = pager.getAdapter().getCount();
    for (int i = 0; i < tabCount; i++) {
      if (pager.getAdapter() instanceof IconTabProvider) {
        addIconTab(i,
            ((IconTabProvider) pager.getAdapter())
                .getPageIconResId(i));
      } else {
        addTextTab(i, pager.getAdapter().getPageTitle(i).toString());
      }
    }
    updateTabStyles();
    getViewTreeObserver().addOnGlobalLayoutListener(
        new OnGlobalLayoutListener() {
          @Override
          public void onGlobalLayout() {
            getViewTreeObserver()
                .removeGlobalOnLayoutListener(this);
            currentPosition = pager.getCurrentItem();
            scrollToChild(currentPosition, 0);
          }
        });
  }
  private void addTextTab(final int position, String title) {
    TextView tab = new TextView(getContext());
    tab.setText(title);
    tab.setGravity(Gravity.CENTER);
    tab.setSingleLine();
    addTab(position, tab);
  }
  private void addIconTab(final int position, int resId) {
    ImageButton tab = new ImageButton(getContext());
    tab.setImageResource(resId);
    addTab(position, tab);
  }
  private void addTab(final int position, View tab) {
    tab.setFocusable(true);
    tab.setOnClickListener(new OnClickListener() {
      @Override
      public void onClick(View v) {
        pager.setCurrentItem(position);
      }
    });
    tab.setPadding(tabPadding, 0, tabPadding, 0);
    tabsContainer
        .addView(tab, position, shouldExpand ? expandedTabLayoutParams
            : defaultTabLayoutParams);
  }
  private void updateTabStyles() {
    for (int i = 0; i < tabCount; i++) {
      View v = tabsContainer.getChildAt(i);
      v.setBackgroundResource(tabBackgroundResId);
      if (v instanceof TextView) {
        TextView tab = (TextView) v;
        tab.setTextSize(TypedValue.COMPLEX_UNIT_PX, tabTextSize);
        tab.setTypeface(tabTypeface, tabTypefaceStyle);
        tab.setTextColor(tabTextColor);
        // setAllCaps() is only available from API 14, so the upper case
        // is made manually if we are on a
        // pre-ICS-build
        if (textAllCaps) {
          if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
            tab.setAllCaps(true);
          } else {
            tab.setText(tab.getText().toString()
                .toUpperCase(locale));
          }
        }
        if (i == selectedPosition) {
          tab.setTextColor(selectedTabTextColor);
        }
      }
    }
  }
  private void scrollToChild(int position, int offset) {
    if (tabCount == 0) {
      return;
    }
    int 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();
    // draw underline
    rectPaint.setColor(underlineColor);
    canvas.drawRect(0, height - underlineHeight, tabsContainer.getWidth(),
        height, rectPaint);
    // draw indicator line
    rectPaint.setColor(indicatorColor);
    // default: line below current tab
    View currentTab = tabsContainer.getChildAt(currentPosition);
    float lineLeft = currentTab.getLeft();
    float 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) {
      View nextTab = tabsContainer.getChildAt(currentPosition + 1);
      final float nextTabLeft = nextTab.getLeft();
      final float nextTabRight = nextTab.getRight();
      lineLeft = (currentPositionOffset * nextTabLeft + (1f - currentPositionOffset)
          * lineLeft);
      lineRight = (currentPositionOffset * nextTabRight + (1f - currentPositionOffset)
          * lineRight);
    }
    canvas.drawRect(lineLeft, height - indicatorHeight, lineRight, height,
        rectPaint);
    // draw divider
    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) {
      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);
      }
    }
  }
  public void setSelectedPosition(int selectedPosition) {
    this.selectedPosition = selectedPosition;
  }
  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 setIndicatorHeight(int indicatorLineHeightPx) {
    this.indicatorHeight = indicatorLineHeightPx;
    invalidate();
  }
  public int getIndicatorHeight() {
    return indicatorHeight;
  }
  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 setUnderlineHeight(int underlineHeightPx) {
    this.underlineHeight = underlineHeightPx;
    invalidate();
  }
  public int getUnderlineHeight() {
    return underlineHeight;
  }
  public void setDividerPadding(int dividerPaddingPx) {
    this.dividerPadding = dividerPaddingPx;
    invalidate();
  }
  public int getDividerPadding() {
    return dividerPadding;
  }
  public void setScrollOffset(int scrollOffsetPx) {
    this.scrollOffset = scrollOffsetPx;
    invalidate();
  }
  public int getScrollOffset() {
    return scrollOffset;
  }
  public void setShouldExpand(boolean shouldExpand) {
    this.shouldExpand = shouldExpand;
    notifyDataSetChanged();
  }
  public boolean getShouldExpand() {
    return shouldExpand;
  }
  public boolean isTextAllCaps() {
    return textAllCaps;
  }
  public void setAllCaps(boolean textAllCaps) {
    this.textAllCaps = textAllCaps;
  }
  public void setTextSize(int textSizePx) {
    this.tabTextSize = textSizePx;
    updateTabStyles();
  }
  public int getTextSize() {
    return tabTextSize;
  }
  public void setTextColor(int textColor) {
    this.tabTextColor = textColor;
    updateTabStyles();
  }
  public void setTextColorResource(int resId) {
    this.tabTextColor = getResources().getColor(resId);
    updateTabStyles();
  }
  public int getTextColor() {
    return tabTextColor;
  }
  public void setSelectedTextColor(int textColor) {
    this.selectedTabTextColor = textColor;
    updateTabStyles();
  }
  public void setSelectedTextColorResource(int resId) {
    this.selectedTabTextColor = getResources().getColor(resId);
    updateTabStyles();
  }
  public int getSelectedTextColor() {
    return selectedTabTextColor;
  }
  public void setTypeface(Typeface typeface, int style) {
    this.tabTypeface = typeface;
    this.tabTypefaceStyle = style;
    updateTabStyles();
  }
  public void setTabBackground(int resId) {
    this.tabBackgroundResId = resId;
    updateTabStyles();
  }
  public int getTabBackground() {
    return tabBackgroundResId;
  }
  public void setTabPaddingLeftRight(int paddingPx) {
    this.tabPadding = paddingPx;
    updateTabStyles();
  }
  public int getTabPaddingLeftRight() {
    return tabPadding;
  }
  @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<SavedState> CREATOR = new Parcelable.Creator<SavedState>() {
      @Override
      public SavedState createFromParcel(Parcel in) {
        return new SavedState(in);
      }
      @Override
      public SavedState[] newArray(int size) {
        return new SavedState[size];
      }
    };
  }
}

xml布局中直接引用

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:orientation="vertical"
    android:layout_height="match_parent">
      <com.baobao.pagerslidingtabstrip.PagerSlidingTabStrip
        android:id="@+id/slide_tabs"
        android:layout_width="match_parent"
        android:layout_height="40dp"/>
    <android.support.v4.view.ViewPager
        android:id="@+id/slide_pager"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
</LinearLayout>

Activity代码

package com.baobao.pagerslidingtabstrip;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.view.ViewPager;
import android.util.DisplayMetrics;
import android.util.TypedValue;
public class MainActivity extends FragmentActivity {
  private static final int VIEW_PAGE_SIZE = 8;
  private PagerSlidingTabStrip mSlideTabs;
  private DisplayMetrics mDm;
  private ViewPager mSlidePager;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    //初始化 标签栏
    mDm = getResources().getDisplayMetrics();
    mSlidePager = (ViewPager) findViewById(R.id.slide_pager);
    mSlideTabs = (PagerSlidingTabStrip) findViewById(R.id.slide_tabs);
    if (mSlidePager.getAdapter() == null) {
      mSlidePager.setOffscreenPageLimit(VIEW_PAGE_SIZE);
      mSlidePager.setAdapter(new TabPageIndicatorAdapter(getSupportFragmentManager()));
    }
    mSlideTabs.setViewPager(mSlidePager);
    setTabsValue();
  }
  /**
   * 设置PagerSlidingTabStrip的样式
   */
  private void setTabsValue() {
    // 设置Tab是自动填充满屏幕的
    mSlideTabs.setShouldExpand(true);
    // 设置Tab的分割线是透明的
    //tabs.setDividerColor(Color.TRANSPARENT);
    // 设置Tab底部线的高度
    mSlideTabs.setUnderlineHeight((int) TypedValue.applyDimension(
        TypedValue.COMPLEX_UNIT_DIP, 2, mDm));
    // 设置Tab Indicator的高度
    mSlideTabs.setIndicatorHeight((int) TypedValue.applyDimension(
        TypedValue.COMPLEX_UNIT_DIP, 1, mDm));
    // 设置Tab标题文字的大小
    mSlideTabs.setTextSize((int) TypedValue.applyDimension(
        TypedValue.COMPLEX_UNIT_SP, 14, mDm));
    // 设置Tab Indicator的颜色
    mSlideTabs.setIndicatorColor(getResources().getColor(R.color.common_blue));
    // 设置选中Tab文字的颜色 (这是我自定义的一个方法)
    mSlideTabs.setSelectedTextColor(getResources().getColor(R.color.common_blue));
    // 取消点击Tab时的背景色
    mSlideTabs.setTabBackground(0);
  }
}

样式文件 attrs.xml

<resources>
    <declare-styleable name="Themes">
        <attr name="numberProgressBarStyle" format="reference" />
    </declare-styleable>
    <declare-styleable name="mGallery">
        <attr name="android:galleryItemBackground" />
    </declare-styleable>
       <declare-styleable name="PagerSlidingTabStrip">
        <attr name="pstsIndicatorColor" format="color" />
        <attr name="pstsUnderlineColor" format="color" />
        <attr name="pstsDividerColor" format="color" />
        <attr name="pstsIndicatorHeight" format="dimension" />
        <attr name="pstsUnderlineHeight" format="dimension" />
        <attr name="pstsDividerPadding" format="dimension" />
        <attr name="pstsTabPaddingLeftRight" format="dimension" />
        <attr name="pstsScrollOffset" format="dimension" />
        <attr name="pstsTabBackground" format="reference" />
        <attr name="pstsShouldExpand" format="boolean" />
        <attr name="pstsTextAllCaps" format="boolean" />
    </declare-styleable>
</resources>
文章标签：
Android开发
数据格式
XML
关键词：
Android demo
Android用法
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